Description
L-Tryptofan, CAS 73-22-3
L-tryptophan zwitterion
0,99 €
L-Tryptofan, CAS 73-22-3
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Chemical Overview: L-TryptophanMolGod_OVERVIEW_1
| Molecular formula | C11H12N2O2 |
| Molecular weight | 204.22 g/mol |
| Melting point | 290.5 °C |
| LogP (lipophilicity) | -1.1 |
| IUPAC name | (2S)-2-amino-3-(1H-indol-3-yl)propanoic acid |
| SMILES | C1=CC=C2C(=C1)C(=CN2)C[C@@H](C(=O)O)N |
| InChIKey | QIVBCDIJIAJPQS-VIFPVBQESA-N |
Synonyms: L-tryptophan · tryptophan · 73-22-3 · L-Tryptophane · Tryptophane
Data sources: PubChem (NLM/NIH)
Last updated: 2026-11-10
🎓 Badania akademickie: L-Tryptophan
SCIENTIFIC RESEARCH
[1]PubMed2026
Adámez-Rodríguez S; Marina ML; Castro-Puyana M. 2026. "Simultaneous enantiomeric separation of tryptophan-related metabolites by cyclodextrin-electrokinetic chromatography. Application to the chiral a
Universidad de Alcalá
[2]PubMed2026
Genitoni M; Greco P; Paradisi A; Sensi M; Berto M; Murgia M. 2026. "Discrimination of Tryptophan Enantiomers at Sub-pm Level by Multiparametric Analysis of a Label-Free Organic Immunosensor." Small me
Center for Translational Neurophysiology of Speech and Communication
[3]EuropePMC2025
EFSA Panel on Additives and Products or Substances used in Animal Feed (FEEDAP), Villa RE, Azimonti G, Bonos E, Christensen H, Durjava M, Dusemund B, Gehring R, Glandorf B, Kouba M, López-Alonso M, Ma
[4]EuropePMC2025
EFSA Panel on Additives and Products or Substances used in Animal Feed (FEEDAP), Villa RE, Azimonti G, Bonos E, Christensen H, Durjava M, Dusemund B, Gehring R, Glandorf B, Kouba M, López-Alonso M, Ma
[5]EuropePMC2024
EFSA Panel on Additives and Products or Substances used in Animal Feed (FEEDAP), Bampidis V, Azimonti G, Bastos ML, Christensen H, Durjava M, Dusemund B, Kouba M, López-Alonso M, López Puente S, Marco
Physicochemical properties
Quick Reference
Formula:
C11H12N2O2
MW:
204.22 g/mol
CAS:
73-22-3
Appearance:
Leaflets or plates from dilute alcohol
Odour:
Odorless
Odour:
Odorless
Detailed Properties
| Property | Value | Unit | Conditions | Source |
|---|---|---|---|---|
| Melting Point (mp) | 290.50 °C (554.9 °F) | decomp. | PubChem PUG-View (2026) | |
| Water Solubility | 13.400 | g/L | 25 °C (77 °F) | PubChem PUG-View (2026) |
🔬 Advanced Properties
Chemical Identifiers
SMILES:
C1=CC=C2C(=C1)C(=CN2)C[C@@H](C(=O)O)N Data sources: PubChem, NIST Chemistry WebBook, CRC Handbook of Chemistry and Physics (103rd ed.)
Last updated: 2026-07-11
📡 Spectroscopy — CAS 73-22-3MolGod_SPECHUB_MAIN
Physical & Chemical Properties (DB) 4 fields MolGod Score: Reliable
| Property | Value | Unit | Conditions | Source |
|---|---|---|---|---|
| Melting point | 290.50 [5][6][11] | °C | decomp. | PubChem PUG-View (2026) |
| Boiling point | rozkłada się [5][6][11] | — | przed wrzeniem (decomp.) | PubChem PUG-View (2026) |
| Water solubility | 13.400 [5] | g/L | 25°C | PubChem PUG-View (2026) |
| logP (octanol/water) | -1.100 [5][8][9] | — | 25°C | PubChem PUG-View (2026) |
📚 Scientific references (Chicago Author-Date) (12 sources)
- Haynes, William M., ed. 2024. CRC Handbook of Chemistry and Physics. 105th ed. Boca Raton: CRC Press/Taylor & Francis. ISBN 978-1-032-55554-4. ↗
- National Institute of Standards and Technology. 2024. "NIST Chemistry WebBook, SRD 69." Gaithersburg, MD: NIST. Accessed 2025-01-01. ↗
- Yaws, Carl L. 2014. The Yaws Handbook of Physical Properties for Hydrocarbons and Chemicals. 2nd ed. Oxford: Gulf Professional Publishing.
- PubChem. 2024. "PubChem Compound Database." National Library of Medicine, National Institutes of Health. Accessed 2025-01-01. ↗
- Marrero, J., and R. Gani. 2001. "Group-Contribution Based Estimation of Pure Component Properties." Fluid Phase Equilibria 183–184: 183–208. ↗
- Joback, K. G., and R. C. Reid. 1987. "Estimation of Pure-Component Properties from Group-Contributions." Chemical Engineering Communications 57 (1–6): 233–243. ↗
- Sangster, J. 1997. Octanol-Water Partition Coefficients: Fundamentals and Physical Chemistry. Chichester: Wiley. ISBN 978-0-471-97397-3.
- Mannhold, Raimund, and Han van de Waterbeemd. 2001. "Substructure and Whole Molecule Approaches for Calculating Log P." Journal of Computer-Aided Molecular Design 15 (4): 337–354. ↗
- Perrin, Ditlev D., Boyd Dempsey, and E. P. Serjeant. 1981. pKa Prediction for Organic Acids and Bases. London: Chapman and Hall. ISBN 0-412-21090-5.
- Constantinou, Leonidas, and Rafiqul Gani. 1994. "New Group Contribution Method for Estimating Properties of Pure Compounds." AIChE Journal 40 (10): 1697–1710. ↗
- Ertl, Peter, Bernhard Rohde, and Paul Selzer. 2000. "Fast Calculation of Molecular Polar Surface Area as a Sum of Fragment-Based Contributions and Its Application to the Prediction of Drug Transport Properties." Journal of Medicinal Chemistry 43 (20): 3714–3717. ↗
🛡️ Safety — CAS 73-22-3MolGod_SAFEHUB_MAIN
Data limitations notice. The safety information on this page is for reference only and does not replace a full safety data sheet (SDS). Before using the product, consult the manufacturer's current safety data sheet and the GHS/CLP guidance. The CLP classification applies to the pure bulk substance, not to commercial formulations.
No harmonised GHS classification for this substance — see the supplier's current safety data sheet (SDS).
📚 Consolidated scientific references — Chicago Author-Date 10 sources
References collected from all Safety Hub tabs. CAS: 73-22-3 ·
PubChem ↗
- Parlament Europejski i Rada UE. 2008. "Rozporządzenie (WE) nr 1272/2008 w sprawie klasyfikacji, oznakowania i pakowania substancji (CLP)." Dz.Urz. UE L 353. [↗] GHS, Regulations
- United Nations Economic Commission for Europe (UNECE). 2021. "Globally Harmonized System of Classification and Labelling of Chemicals (GHS), Ninth Revised Edition." United Nations, Geneva. [↗] GHS
- Goldfrank, Lewis R., Robert S. Hoffman, Mary Ann Howland, et al.. 2019. "Goldfrank's Toxicologic Emergencies, 11th ed.." McGraw-Hill Education, New York. ISBN 978-1-25-985961-8. Pierwsza pomoc, Toksykologia
- National Institute for Occupational Safety and Health (NIOSH). 2023. "NIOSH Pocket Guide to Chemical Hazards (DHHS Publ. 2005-149)." U.S. Department of Health and Human Services / CDC, Cincinnati, OH. [↗] Pierwsza pomoc, PPE, Toksykologia
- European Committee for Standardization (CEN). 2016. "EN 374-1:2016 — Protective gloves against dangerous chemicals and micro-organisms." CEN, Brussels. [↗] PPE
- UNECE. 2023. "European Agreement Concerning the International Carriage of Dangerous Goods by Road (ADR 2025)." United Nations, Geneva. [↗] Utylizacja, Regulacje
- National Fire Protection Association (NFPA). 2022. "NFPA 400 — Hazardous Materials Code." NFPA, Quincy, MA. [↗] Magazynowanie
- Urben, P.G. (ed.). 2017. "Bretherick's Handbook of Reactive Chemical Hazards, 8th ed.." Butterworth-Heinemann / Elsevier, Oxford. [↗] Magazynowanie
- Ministerstwo Klimatu i Środowiska RP. 2023. "Baza danych o produktach i opakowaniach oraz o gospodarce odpadami (BDO)." Ministerstwo Klimatu i Środowiska, Warszawa. [↗] Utylizacja
- International Agency for Research on Cancer (IARC / WHO). 2024. "IARC Monographs on the Identification of Carcinogenic Hazards to Humans — List of Classifications." WHO, Lyon. [↗] Toksykologia
Tabs with their own references (Emergency, PPE, Storage, Waste) contain additional bibliographic entries within their respective sections.
Analytical statistics (t-test · RSD · Grubbs · Q-Dixon) ICH Q2
Paste a series of replicate measurements (CSV, or one number per line). The calculator computes the mean, standard deviation and 95% CI, and detects outliers (Grubbs + Dixon Q).
Separator: comma, space, tab, new line. Minimum 3 measurements.
📐 Statistical formulas
x̄ = Σxᵢ / n— arithmetic means² = Σ(xᵢ - x̄)² / (n-1)— sample variances = √s²— standard deviationRSD% = (s / x̄) × 100%— relative standard deviationCI₉₅ = x̄ ± t(0.05, n-1) × s / √n— Student's tG = |xᵢ - x̄| / s— Grubbs' testQ = |xsuspect - xnearest| / |xmax - xmin|— Dixon Q-test
Source: ICH Q2(R2) Validation of Analytical Procedures · ICH PDF ↗
Buffer Recipe Calculator UNIQUE
Choose a buffer from the list of 20 popular systems → enter the target pH → get an exact recipe with the masses to weigh out.
Step 1: Choose a buffer system
📜 Recipe history (last 10)
🔧 HPLC troubleshooting — decision tree 6 common problems
Diagnostics for the 12 most common HPLC problems with a decision tree (5 steps per problem). Source: Snyder/Kirkland/Dolan 3rd ed. Chapter 17 + LCGC LC Troubleshooting columns 1989-2024.
Broad peaks medium
Symptom: All peaks on the chromatogram are wider than expected (FWHM > 2× normal)
🔍 Diagnostic tree:
-
1. Check whether all peaks are broadened or only some
→ YES: All → instrumental problem (column or system)
→ NO: Only some → chemistry problem (interaction with the column for specific analytes) -
2. Swap in a test column — does the problem disappear?
→ YES: COLUMN worn out — packing damaged, void in the first few mm. Replace it.
→ NO: Problem in the LC system -
3. Check the dead volume — injection loop, connections, detector
→ YES: Loop > 100 µL for a 4.6 mm column or loose connections → replace ferrules, shorten tubing
→ NO: Continue diagnostics -
4. Temperature test: raise the column from 25°C to 40°C
→ YES: Narrower peaks → mass-transfer kinetics too slow (increase T)
→ NO: Continue -
5. Check flow rate vs the optimal van Deemter value for this column
→ YES: Optimum for 4.6mm/5µm = 1.0 mL/min, for 2.1mm/3µm = 0.4 mL/min
→ NO: Continue
⚠️ Common causes:
- Column worn out (>2000 injections without a guard)
- System dead volume > 100 µL (wrong loop, long tubing, loose ferrules)
- Temperature too low (mass-transfer kinetics)
- Flow rate outside the van Deemter optimum
- Sample solvent stronger than mobile phase A
✓ Fixes:
- ✓ Replace the column (when >2000 injections)
- ✓ Check all connections — keep tubing as short as possible
- ✓ Increase column T to 40°C (if the substance is stable)
- ✓ Reduce flow to the van Deemter optimum
- ✓ Dissolve the sample in mobile phase A (not in pure organic)
Peak tailing (T > 1.5) high
Symptom: Peaks have an extended "tail" on the late-elution side (asymmetry T = b/a > 1.5 per USP)
🔍 Diagnostic tree:
-
1. Does the substance contain basic groups (amino, pyridine)?
→ YES: Yes → silanol interactions! Add 0.1% TFA or 5-10 mM TEA to mobile phase A.
→ NO: Continue -
2. Check the mobile-phase pH vs the substance pKa
→ YES: pH = pKa ± 1 → partial ionization, peak split. Move pH ≥ 2 units away from pKa.
→ NO: Continue -
3. Check the column age (>1500 injections?)
→ YES: Yes → exposed silanols (column bleed). Replace with a column with higher endcapping (XTerra, Symmetry).
→ NO: Continue -
4. Does the sample contain metals (Fe, Cu from glass vials)?
→ YES: Yes → use type II clear vials or PFA. Add 0.1mM EDTA to the sample.
→ NO: Continue
⚠️ Common causes:
- Silanol interactions (basic analyte + silica gel free silanols)
- pH at the boundary of the analyte pKa (peak split)
- Old column (column bleed, high silanol activity)
- Metals in the sample (chelation → tailing)
- Column overload (>50 µg on a 4.6mm column)
✓ Fixes:
- ✓ Add 0.1% TFA (UV) or 0.1% formic acid (LC-MS) to mobile phase A
- ✓ Choose a column with high-purity endcapping: Waters XBridge BEH, Phenomenex Kinetex
- ✓ Work at pH ≥ 2 units away from pKa
- ✓ Add 0.1mM EDTA to the sample (Fe/Cu chelation)
- ✓ Reduce the injection volume to ≤ 20 µL for a 4.6mm column
Baseline drift medium
Symptom: The baseline rises or falls systematically for >5 minutes
🔍 Diagnostic tree:
-
1. Are you running a gradient (B% increasing)?
→ YES: Yes → different absorption of phases A vs B at dλ. Solvent change in UV cutoff. Check the % organic UV absorbance.
→ NO: Continue (isocratic) -
2. Check the column temperature — is it stable to ±0.5°C?
→ YES: Yes (stable) → continue
→ NO: Unstable → turn on the column thermostat (>25°C controlled) -
3. Test: turn off the autosampler, run pump+column+detector alone
→ YES: Drift disappears → autosampler contamination (clean the needle, septum)
→ NO: Continue -
4. Check the lamp age (D2 for UV)
→ YES: Yes (>1500 hours) → replace the lamp
→ NO: Continue
⚠️ Common causes:
- Gradient elution with different UV cutoff of the phases
- Unstable column T
- Autosampler contamination of the needle/septum
- Old UV lamp (>1500h)
- Detector flow cell fouled
- Column not equilibrated (<10 column volumes)
✓ Fixes:
- ✓ Pre-equilibrate the column for 10-15 column volumes at 100% A
- ✓ Column thermostat on, T 30-40°C stable
- ✓ Clean the detector flow cell with 50:50 ACN:H2O
- ✓ Replace the D2 lamp if >1500h
- ✓ Use baseline subtraction (Chromeleon, Empower native function)
No peak / lost peak critical
Symptom: The expected analyte peak does not appear on the chromatogram
🔍 Diagnostic tree:
-
1. Did the injection actually take place?
→ YES: Check the autosampler log, pump pressure (should drop during injection)
→ NO: Autosampler problem → check the loop, needle, sample in the vial -
2. Is the sample in the vial (correct volume, not evaporated)?
→ YES: Continue
→ NO: No sample — re-pipette -
3. Sample stability — prepared >24h ago?
→ YES: Yes → degradation. Re-prepare a fresh sample.
→ NO: Continue -
4. Check the detection wavelength vs the substance λmax
→ YES: Detection at λ does NOT match λmax → no signal. Scan DAD 200-400nm.
→ NO: Continue -
5. Test: inject a pure standard (of known concentration, fresh)
→ YES: The standard gives a peak → problem with the sample (matrix, derivatization)
→ NO: No peak even with the standard → system problem (column, phase, gradient)
⚠️ Common causes:
- Sample not drawn from the vial (autosampler bug)
- Sample degraded (>24h pH/temp/light)
- Detection at the wrong wavelength
- Wrong mobile phase (e.g. forgotten TFA)
- Column reversed / wrong stationary phase
- Substance elutes at the front (V0) → unretained, not visible
✓ Fixes:
- ✓ Re-prepare a fresh sample per the exact protocol
- ✓ UV-Vis DAD scan 200-400nm + search for λmax
- ✓ Check the mobile-phase composition — was TFA added?
- ✓ Test the reverse column direction (carefully!)
- ✓ For retention <1 min — lower the % B, MeOH instead of ACN
- ✓ Check the "expected_rt" table in wp_molgod_hplc_methods
Pressure too high critical
Symptom: Pump pressure > 80% of the column max or system shutdown with a high-pressure error
🔍 Diagnostic tree:
-
1. Check that the column is connected correctly (arrow direction)
→ YES: OK
→ NO: Column reversed → flip it (never run it "backwards") -
2. Test: remove the column from the system, run pump+detector alone
→ YES: Pressure drops to <50 bar → problem in the column (clogged)
→ NO: Pressure stays high → in-line filter clogged, frit fouled -
3. Check the pre-column filter (in-line frit)
→ YES: Fouled and brown → replace it
→ NO: Continue -
4. Back-flush the column with 50:50 ACN:H2O without the column — does it disappear?
→ YES: Particles stuck in the first mm — a 30 min flush may recover it
→ NO: Replace the column
⚠️ Common causes:
- In-line filter (frit) clogged with particles
- Buffer salting out (precipitation at high %B)
- Sample contains suspended matter (filter 0.22 µm before injection)
- Column clogged (column bed compaction)
- Gradient with a buffer phase + high organic → salt precipitation
✓ Fixes:
- ✓ ALWAYS filter the sample through 0.22 µm PVDF before injection
- ✓ Replace the in-line filter every 100 injections (or when pressure rises >20%)
- ✓ Do NOT use >20mM phosphate buffer + >70% ACN (the salt precipitates)
- ✓ Flush the column for 30 min with 50:50 ACN:H2O in the reverse direction (when the manufacturer allows it)
- ✓ Pre-column 4×3mm to protect the main column
Ghost peaks high
Symptom: Unexplained peaks on the chromatogram absent from the calibration
🔍 Diagnostic tree:
-
1. Test: blank injection (pure sample solvent)
→ YES: A ghost appears → contamination of the system or eluents
→ NO: Appears only with the sample → matrix -
2. Does the ghost grow with the gradient (elutes at high %B)?
→ YES: Yes → overloaded column or strong-retained from a previous run
→ NO: Independent of the gradient → autosampler carryover -
3. Increase carryover wash (between injections)
→ YES: Helps → carryover was to blame. Use a stronger wash protocol.
→ NO: Continue -
4. Pure water injection — is there a peak?
→ YES: Yes → contamination of the water source (organics from the DI system)
→ NO: Continue
⚠️ Common causes:
- Carryover in the autosampler needle/loop
- Eluent contamination (even HPLC-grade)
- Strong-retained components from previous runs
- Plastic in the vials (phthalates, PEG from the caps)
- Insufficiently purified DI water
✓ Fixes:
- ✓ Strengthen the wash protocol: 100% B → 100% A → 50:50 (3 cycles)
- ✓ Strong wash: 100% DMSO or 100% MeOH before calibration
- ✓ Filter the eluents through 0.22 µm PTFE if in doubt
- ✓ Use amber glass + Teflon-lined caps for samples
- ✓ Periodic gradient ramp to 100% B for 10 min (clean-out)
📚 Scientific references (Chicago Author-Date) — click to expand
- Snyder, Lloyd R., Joseph J. Kirkland, and John W. Dolan. 2010. Introduction to Modern Liquid Chromatography. 3rd ed. John Wiley & Sons. Chapter 17 (Troubleshooting) pp. 559-616. ISBN 978-0-470-16754-0. https://doi.org/10.1002/9780470508183 [link ↗]
- Dolan, John W.. 2014. LC Troubleshooting (monthly column 1989-2024). LCGC North America. [link ↗] — John Dolan 35-letnia seria miesięcznych artykułów problemowych
- Kromidas, Stavros. 2017. HPLC Made to Measure: A Practical Handbook for Optimization. 2nd ed. Wiley-VCH. ISBN 978-3-527-31377-1. — Praktyczny przewodnik problem-solving dla labs analitycznych
- Dolan, John W.. 2013. When to Modify Method Conditions. 192-199. [link ↗] — Decision flow for changing flow rate / temperature / %B vs swapping columns.
- Dong, Michael W.. 2019. HPLC and UHPLC for Practicing Scientists. 2nd ed. Wiley. ISBN 978-1-119-31378-3. https://doi.org/10.1002/9781119313793 [link ↗] — Chapter 9 covers troubleshooting modern UHPLC systems (sub-2 µm particles).
- Meyer, Veronika R.. 2010. Practical High-Performance Liquid Chromatography. 5th ed. Wiley. ISBN 978-0-470-68218-0. — Solid step-by-step problem isolation chapter (eluents, columns, instruments).
- Snyder, L. R., J. J. Kirkland, and J. L. Glajch. 1997. Practical HPLC Method Development. 2nd ed. Wiley. ISBN 978-0-471-00703-6. — Method-development companion volume with troubleshooting cross-refs.
- Carr, Peter W.. 2009. The new physical chemistry of HPLC. 1764-1772. https://doi.org/10.1016/j.chroma.2008.11.094 [link ↗] — Theoretical basis for diagnosing efficiency losses (mass-transfer, eddy diffusion).
- Heyden, Yvan Vander, et al.. 2009. Robustness of pharmaceutical liquid chromatographic methods. 2120-2129. https://doi.org/10.1016/j.jchromb.2008.10.052 [link ↗] — How to diagnose method failures vs. system failures (Plackett-Burman).
- Engelhardt, Heinz. 2014. 100 Years of Chromatography. 2nd ed. Wiley-VCH. ISBN 978-3-527-33473-5. — Historical context for ghost-peak phenomenology (silica chemistry).
- Stoll, Dwight R., and Peter W. Carr. 2017. Two-Dimensional Liquid Chromatography: A State of the Art Tutorial. 519-531. https://doi.org/10.1021/acs.analchem.6b03506 [link ↗]
- Carr, Peter W.. 2009. The new physical chemistry of HPLC. 1764-1772. https://doi.org/10.1016/j.chroma.2008.11.094 [link ↗]
- Wu, Naijun, and Anton M. Clausen. 2007. Fundamental and practical aspects of ultrahigh pressure liquid chromatography for fast separations. 1167-1182. https://doi.org/10.1002/jssc.200700026 [link ↗]
- Engelhardt, Heinz. 2014. 100 Years of Chromatography. 2nd ed. Wiley-VCH. ISBN 978-3-527-33473-5.
- Vivó-Truyols, Gabriel, and Hans-Gerd Janssen. 2010. Probabilistic approach to peak deconvolution in chromatography. 8525-8531. https://doi.org/10.1021/ac101742z [link ↗]
🧪 Solution preparation assistant (Smart Prep) MolGod_PREP_2
Enter what you want to prepare — I'll generate an SOP
Examples below — click to insert:
Preset recipes:
📚 Scientific literature overview — CAS 73-22-3MolGod_LITHUB_MAIN
⭐ Key findings (scientific literature) 8 publications
🏆 CAS
73-22-3
— multi-criteria ranking (W12): 30% citations · 20% recency · 20% topic · 15% historical · 15% open access.
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#1Václav Pokorný, Vojtěch Štejfa, Jakub Havlín et al. (2021) · MoleculesWhy it matters: Open access
-
#2Dukes A; Davis C; El Refaey M et al. (2015) · Nutrition (Burbank, Los Angeles County, Calif.)Why it matters: Must-cite (canon)
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#3Serotonin, Kynurenine, and Indole Pathways of Tryptophan Metabolism in Humans in Health and Disease.Holeček M (2026) · NutrientsWhy it matters: Recent (2026) · review · open access
-
#4Wang Y, Li F, Li J et al. (2026) · Cell metabolismWhy it matters: Recent (2026) · open access
-
#5Brinck JE, Laursen MF, Pedersen M et al. (2026) · NPJ biofilms and microbiomesWhy it matters: Recent (2026) · open access
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#6Jiang D, Soo N, Tan CY et al. (2026) · Nature communicationsWhy it matters: Recent (2026) · open access
-
#7Tian Y; Meng J; Zhang D et al. (2025) · Phytomedicine : international journal of phytotherapy and phytopharmacologyWhy it matters: Must-cite (canon) · recent (2025)
-
#8Jian Li, Zu-Pei Liang, Xi-Shi Tai (2009) · Zeitschrift für Kristallographie - New Crystal StructuresWhy it matters: Open access
Related products
📚 REFERENCES (Aggregate bibliography, Chicago Author-Date) 107 items
All scientific sources cited in the accordions above for CAS 73-22-3. Format: Chicago Manual of Style 17th ed., Author-Date system.
🗄️ Scientific databases
- PubChem. 2026. PubChem Compound Summary: CAS 73-22-3. Bethesda, MD: National Center for Biotechnology Information (NCBI), National Library of Medicine. (Accessed 2026-11-12.)
- NIST. 2026. NIST Chemistry WebBook: CAS 73-22-3. Gaithersburg, MD: National Institute of Standards and Technology. https://webbook.nist.gov/cgi/cbook.cgi?ID=73-22-3. (Accessed 2026-11-12.)
- AIST. 2026. Spectral Database for Organic Compounds (SDBS): CAS 73-22-3. Tsukuba, Japan: National Institute of Advanced Industrial Science and Technology. https://sdbs.db.aist.go.jp/. (Accessed 2026-11-12.)
- ECHA. 2026. C&L Inventory and REACH Registration: CAS 73-22-3. Helsinki: European Chemicals Agency. https://echa.europa.eu/documents/10162/23047722/sds_en.pdf. (Accessed 2026-11-12.)
📐 Standards / Guidelines
- ICH. 2026. "ICH Harmonised Guideline: CAS 73-22-3." Geneva: International Council for Harmonisation. https://database.ich.org/sites/default/files/Q1A%28R2%29%20Guideline.pdf. (Accessed 2026-11-12.)
- National Fire Protection Association (NFPA). 2024. "NFPA 30: Flammable and Combustible Liquids Code." NFPA, Quincy, MA. https://www.nfpa.org/codes-and-standards/all-codes-and-standards/list-of-codes-and-standards/detail?code=30.
- Occupational Safety and Health Administration (OSHA). 2023. "29 CFR 1910.106 — Flammable Liquids." U.S. Department of Labor, Federal Register. https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.106.
- European Chemicals Agency (ECHA). 2024. "Annex VI to Regulation (EC) No 1272/2008 (CLP) — Harmonised Classification and Labelling." ECHA, Helsinki / Official Journal of the European Union. https://echa.europa.eu/regulations/clp/clp-classification.
- European Committee for Standardization (CEN). 2016. "EN 374-1:2016 — Protective gloves against dangerous chemicals and micro-organisms — Part 1: Terminology and performance requirements for chemical risks." CEN, Brussels. https://standards.cencenelec.eu/dyn/www/f?p=205:110:::::FSP_PROJECT,FSP_ORG_ID:38536,6080&cs=1B0DAA8B85DF42E4A2C70E5D71F0BFA32.
- European Committee for Standardization (CEN). 2001. "EN 166:2001 — Personal eye-protection — Specifications." CEN, Brussels. https://standards.cencenelec.eu/dyn/www/f?p=CEN:110:0::::FSP_PROJECT:6541&cs=1F1A4E0A78C4DB6A28DBE2E8C29D89DCF.
- European Committee for Standardization (CEN). 2009. "EN 14605:2005+A1:2009 — Protective clothing against liquid chemicals — Performance requirements for clothing with liquid-tight (Type 3) or spray-tight (Type 4) connections." CEN, Brussels. https://standards.cencenelec.eu/dyn/www/f?p=CEN:110:0::::FSP_PROJECT:21581&cs=1A04A2D3C7CC58E9E6CB58D55F7EBFB7E.
- National Institute for Occupational Safety and Health (NIOSH). 2017. "Recommendations for Chemical Protective Clothing: A Companion to the NIOSH Pocket Guide." U.S. Department of Health & Human Services / CDC. https://www.cdc.gov/niosh/ncpc/default.html.
- Occupational Safety and Health Administration (OSHA). 2011. "Personal Protective Equipment — General requirements." U.S. Department of Labor — 29 CFR 1910.132. https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.132.
📖 Books
- Hansen, Charles M. 2007. Hansen Solubility Parameters: A User's Handbook, 2nd ed.. Boca Raton, FL: CRC Press. https://www.routledge.com/Hansen-Solubility-Parameters-A-Users-Handbook/Hansen/p/book/9780849372483.
- Barton, Allan F. M. 1991. CRC Handbook of Solubility Parameters and Other Cohesion Parameters: 2nd ed.. Boca Raton, FL: CRC Press. https://www.routledge.com/CRC-Handbook-of-Solubility-Parameters-and-Other-Cohesion-Parameters/Barton/p/book/9780849301766.
- Connors, Kenneth A., Gordon L. Amidon, and Valentino J. Stella. 1986. Chemical Stability of Pharmaceuticals: A Handbook for Pharmacists, 2nd ed.. New York: Wiley. https://doi.org/10.1002/0471734683.
- Rumble, John R., ed. 2019. CRC Handbook of Chemistry and Physics: 100th Edition. Boca Raton, FL: CRC Press. https://hbcp.chemnetbase.com/.
- Urben, Peter G. 2017. Bretherick's Handbook of Reactive Chemical Hazards, 8th Edition. Academic Press / Elsevier, Oxford. https://www.sciencedirect.com/book/9780081010594.
📘 Monographs
- IARC. 2026. IARC Monographs on the Identification of Carcinogenic Hazards to Humans: CAS 73-22-3. Lyon, France: International Agency for Research on Cancer, World Health Organization. (Accessed 2026-11-12.)
📄 Scientific articles (peer-reviewed)
- Stefanis, Emmanuel, and Costas Panayiotou. 2008. "Prediction of Hansen Solubility Parameters with a New Group-Contribution Method." International Journal of Thermophysics 29: 568-585. https://doi.org/10.1007/s10765-008-0415-z.
- Stoll, Vincent S., and John S. Blanchard. 1990. "Buffers: Principles and Practice: In Methods in Enzymology, vol. 182." San Diego: Academic Press. https://doi.org/10.1016/0076-6879(90)82008-P.
🌐 Websites
- ECHA. 2023. "Guidance on the Application of the CLP Criteria." European Chemicals Agency. https://echa.europa.eu/guidance-documents/guidance-on-clp.
- European Parliament. 2006. "Regulation (EC) No 1907/2006 (REACH)." Official Journal of the European Union L 396: 1–849.
- ECHA. 2023. "Candidate List of Substances of Very High Concern for Authorisation." European Chemicals Agency. https://echa.europa.eu/candidate-list-table.
- European Parliament. 2008. "Regulation (EC) No 1272/2008 on Classification, Labelling and Packaging of Substances and Mixtures (CLP)." Official Journal of the European Union L 353: 1–1355.
- ECHA. 2017. "Guidance on the Compilation of Safety Data Sheets." Version 3.1. European Chemicals Agency. ECHA-17-G-01-EN. https://echa.europa.eu/documents/10162/23047722/sds_en.pdf.
- ECHA. 2022. "Restrictions Under REACH — Annex XVII." European Chemicals Agency. https://echa.europa.eu/substances-restricted-under-reach.
- United Nations. 2021. Globally Harmonized System of Classification and Labelling of Chemicals (GHS). 9th revised ed. ST/SG/AC.10/30/Rev.9. New York and Geneva: United Nations. https://unece.org/ghs-rev9-2021.
- ECHA. 2020. "Understanding REACH." European Chemicals Agency. https://echa.europa.eu/regulations/reach/understanding-reach.
- U.S. OSHA. 2026. "Occupational Safety and Health Guidance: CAS 73-22-3." Washington, DC: U.S. Occupational Safety and Health Administration. https://www.osha.gov/hazwoper. (Accessed 2026-11-12.)
- National Fire Protection Association (2018) — NFPA 472: Standard for Competence of Responders to Hazardous Materials/Weapons of Mass Destruction Incidents https://www.nfpa.org/codes-and-standards/nfpa-472.
- European Union. 2026. "EUR-Lex Legal Database: CAS 73-22-3." Luxembourg: Publications Office of the European Union. https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=celex:32012L0018. (Accessed 2026-11-12.)
- U.S. National Institute for Occupational Safety and Health (2024) — NIOSH Pocket Guide to Chemical Hazards https://www.cdc.gov/niosh/npg/.
- Snyder, Lloyd R., John W. Dolan, and Joseph J. Kirkland. 2010. Introduction to Modern Liquid Chromatography. Wiley.
- Schoenmakers, Peter J.. 1986. Optimization of Chromatographic Selectivity: A Guide to Method Development. Elsevier.
- Snyder, L. R., and J. W. Dolan. 2007. High-Performance Gradient Elution: The Practical Application of the Linear-Solvent-Strength Model. Wiley.
- Nikitas, Pavlos, and Adrian Pappa-Louisi. 2009. "Retention models for isocratic and gradient elution in reversed-phase liquid chromatography." Journal of Chromatography A 1216: 1737-1755. https://doi.org/10.1016/j.chroma.2008.10.005.
- Carr, Peter W.. 2009. "The new physical chemistry of HPLC." Journal of Chromatography A 1216: 1764-1772. https://doi.org/10.1016/j.chroma.2008.11.094.
- Dong, Michael W.. 2019. HPLC and UHPLC for Practicing Scientists. Wiley. https://doi.org/10.1002/9781119313793.
- Wu, Naijun, and Anton M. Clausen. 2007. "Fundamental and practical aspects of ultrahigh pressure liquid chromatography for fast separations." Journal of Separation Science 30: 1167-1182. https://doi.org/10.1002/jssc.200700026.
- Dolan, John W.. 2013. "When to Modify Method Conditions." LCGC North America 31: 192-199. https://www.chromatographyonline.com/view/when-modify-method-conditions.
- Meyer, Veronika R.. 2010. Practical High-Performance Liquid Chromatography. Wiley.
- Engelhardt, Heinz. 2014. 100 Years of Chromatography. Wiley-VCH.
- Vivó-Truyols, Gabriel, and Hans-Gerd Janssen. 2010. "Probabilistic approach to peak deconvolution in chromatography." Analytical Chemistry 82: 8525-8531. https://doi.org/10.1021/ac101742z.
- Van Deemter, J. J., F. J. Zuiderweg, and A. Klinkenberg. 1956. "Longitudinal diffusion and resistance to mass transfer as causes of nonideality in chromatography." https://doi.org/10.1016/0009-2509(56)80003-1.
- Giddings, J. Calvin. 1965. "Dynamics of Chromatography, Part I: Principles and Theory." Marcel Dekker.
- Poppe, Hans. 1997. "Some reflections on speed and efficiency of modern chromatographic methods." https://doi.org/10.1016/S0021-9673(97)00376-2.
- Wu, Naijun, and Anton M. Clausen. 2007. "Fundamental and practical aspects of ultrahigh pressure liquid chromatography for fast separations." https://doi.org/10.1002/jssc.200700026.
- Carr, Peter W.. 2009. "The new physical chemistry of HPLC." https://doi.org/10.1016/j.chroma.2008.11.094.
- Knox, John H.. 1977. "Practical aspects of LC theory." https://doi.org/10.1093/chromsci/15.9.352.
- Snyder, L. R., J. J. Kirkland, and J. L. Glajch. 1997. "Practical HPLC Method Development." Wiley.
- Vivó-Truyols, Gabriel, and Hans-Gerd Janssen. 2010. "Probabilistic approach to peak deconvolution in chromatography." https://doi.org/10.1021/ac101742z.
- Sadek, Paul C.. 2002. "The HPLC Solvent Guide." Wiley-Interscience.
- Snyder, L. R.. 1978. "Classification of the solvent properties of common liquids." https://doi.org/10.1093/chromsci/16.6.223.
- Reichardt, Christian, and Thomas Welton. 2010. "Solvents and Solvent Effects in Organic Chemistry." Wiley-VCH.
- Vailaya, Anant, and Csaba Horváth. 1998. "Retention thermodynamics in hydrophobic interaction chromatography." https://doi.org/10.1021/ie980212h.
- Krstulović, Andrea M., and Phyllis R. Brown. 1981. "Reversed-phase High-Performance Liquid Chromatography." Wiley.
- Boysen, Reinhard I., and Milton T. W. Hearn. 2009. "Multi-modal HPLC of proteins." https://doi.org/10.1093/chromsci/47.8.645.
- USP General Chapter <621>. 2024. "Chromatography." United States Pharmacopeial Convention. https://www.usp.org/harmonization-standards/pdg/general-chapters/chromatography.
- Foley, Joe P., and John G. Dorsey. 1983. "Equations for calculation of chromatographic figures of merit for ideal and skewed peaks." https://doi.org/10.1021/ac00255a033.
- Snyder, Lloyd R., Joseph J. Kirkland, and John W. Dolan. 2010. "Introduction to Modern Liquid Chromatography." Wiley. https://doi.org/10.1002/9780470508183.
- Dolan, John W.. 2003. "Peak tailing and resolution." https://www.chromatographyonline.com/view/peak-tailing-and-resolution.
- Kromidas, Stavros. 2017. "HPLC Made to Measure: A Practical Handbook for Optimization." Wiley-VCH.
- Heyden, Yvan Vander, et al.. 2009. "Robustness of pharmaceutical liquid chromatographic methods." https://doi.org/10.1016/j.jchromb.2008.10.052.
- United States Pharmacopeial Convention. 2024. "USP <621> Chromatography." In United States Pharmacopeia and National Formulary, USP 47-NF 42. Rockville, MD: USP. https://www.uspnf.com/.
- European Pharmacopoeia Commission. 2024. "2.2.46 Chromatographic Separation Techniques." In European Pharmacopoeia, 11th ed. Strasbourg: Council of Europe — EDQM. https://www.edqm.eu/en/european-pharmacopoeia-ph-eur-11th-edition.
- International Organization for Standardization. 2017. "ISO/IEC 17025:2017 General Requirements for the Competence of Testing and Calibration Laboratories." Geneva: ISO. https://www.iso.org/standard/66912.html.
- Kolthoff, Izaak Maurits, and Philip J. Elving, eds. 1978. Treatise on Analytical Chemistry, Part I: Theory and Practice. 2nd ed. New York: Wiley-Interscience.
- Skoog, Douglas A., F. James Holler, and Stanley R. Crouch. 2018. Principles of Instrumental Analysis. 7th ed. Boston: Cengage Learning.
- Christian, Gary D., Purnendu K. Dasgupta, and Kevin A. Schug. 2014. Analytical Chemistry. 7th ed. Hoboken, NJ: Wiley.
- EURACHEM/CITAC. 2012. "Quantifying Uncertainty in Analytical Measurement." 3rd ed. EURACHEM/CITAC Guide CG 4. https://www.eurachem.org/images/stories/Guides/pdf/QUAM2012_P1.pdf.
- Snyder, Lloyd R., Joseph J. Kirkland, and John W. Dolan. 2010. "Introduction to Modern Liquid Chromatography." John Wiley & Sons. https://doi.org/10.1002/9780470508183.
- Dolan, John W.. 2003. "How much resolution is enough?." https://www.chromatographyonline.com/view/how-much-resolution-enough.
- USP General Chapter <621>. 2024. "Chromatography (System Suitability section)." United States Pharmacopeial Convention. https://www.usp.org/harmonization-standards/pdg/general-chapters/chromatography.
- U.S. FDA. 2026. "FDA Guidance and Resources: CAS 73-22-3." Silver Spring, MD: U.S. Food and Drug Administration. https://www.fda.gov/media/74954/download. (Accessed 2026-11-12.)
- Rozet, Eric, et al.. 2013. "Analysis of recent pharmaceutical regulatory documents on analytical method validation." https://doi.org/10.1016/j.chroma.2007.03.111.
- European Medicines Agency (EMA). 2011. "Guideline on bioanalytical method validation EMEA/CHMP/EWP/192217/2009." EMA. https://www.ema.europa.eu/en/documents/scientific-guideline/guideline-bioanalytical-method-validation_en.pdf.
- Kazakevich, Yuri V., and Rosario LoBrutto, eds.. 2007. "HPLC for Pharmaceutical Scientists." Wiley-Interscience. https://doi.org/10.1002/9780470087954.
- AOAC International. 2016. "Appendix F: Guidelines for Standard Method Performance Requirements." AOAC INTERNATIONAL. https://www.aoac.org/wp-content/uploads/2019/08/app_f.pdf.
- International Organization for Standardization. 1994. "ISO 5725-2:1994 Accuracy (Trueness and Precision) of Measurement Methods and Results — Part 2: Basic Method for the Determination of Repeatability and Reproducibility of a Standard Measurement Method." Geneva: ISO. https://www.iso.org/standard/11834.html.
- Grubbs, Frank E. 1950. "Sample Criteria for Testing Outlying Observations." Annals of Mathematical Statistics 21 (1): 27–58.
- Dixon, Wilfrid J. 1950. "Analysis of Extreme Values." Annals of Mathematical Statistics 21 (4): 488–506.
- Snedecor, George W., and William G. Cochran. 1989. Statistical Methods. 8th ed. Ames, IA: Iowa State University Press.
- Student [William Sealy Gosset]. 1908. "The Probable Error of a Mean." Biometrika 6 (1): 1–25.
- International Organization for Standardization. 2005. "ISO 3534-1:2006 Statistics — Vocabulary and Symbols — Part 1: General Statistical Terms and Terms Used in Probability." Geneva: ISO. https://www.iso.org/standard/40145.html.
- Thompson, Michael, Stephen L. R. Ellison, and Roger Wood. 2002. "Harmonized Guidelines for Single-Laboratory Validation of Methods of Analysis." Pure and Applied Chemistry 74 (5): 835–855.
- United Nations Economic Commission for Europe. 2024. European Agreement Concerning the International Carriage of Dangerous Goods by Road (ADR), Applicable as from 1 January 2025 (ECE/TRANS/352). Geneva: UNECE. https://unece.org/transport/dangerous-goods/adr-2025-edition.
- International Air Transport Association. 2026. Dangerous Goods Regulations (DGR). 67th ed. Montreal: IATA. https://www.iata.org/en/programs/cargo/dgr/.
- International Maritime Organization. 2024. International Maritime Dangerous Goods (IMDG) Code, 2024 Edition (Amendment 42-24). London: IMO. https://www.imo.org/en/OurWork/Safety/Pages/DangerousGoods-default.aspx.
- United Nations. 2025. Recommendations on the Transport of Dangerous Goods: Model Regulations (Orange Book). 24th revised ed. ST/SG/AC.10/1/Rev.24. New York and Geneva: United Nations. https://unece.org/transport/dangerous-goods/un-model-regulations.
- International Civil Aviation Organization. 2025. Technical Instructions for the Safe Transport of Dangerous Goods by Air (Doc 9284). 2025–2026 ed. Montreal: ICAO. https://www.icao.int/safety/DangerousGoods/Pages/technical-instructions.aspx.
- United States Pharmacopeia (USP) Convention. 2024. "USP General Chapter <621> Chromatography." USP. https://www.usp.org/sites/default/files/usp/document/harmonization/gen-chapter/g05_pf_30_4_2004.pdf.
- European Medicines Agency (EMA). 2011. "Guideline on bioanalytical method validation EMEA/CHMP/EWP/192217/2009." EMA Committee for Medicinal Products for Human Use. https://www.ema.europa.eu/en/documents/scientific-guideline/guideline-bioanalytical-method-validation_en.pdf.
- Sejm RP. 2026. "Internetowy System Aktow Prawnych (ISAP): CAS 73-22-3." Warszawa: Kancelaria Sejmu Rzeczypospolitej Polskiej. https://isap.sejm.gov.pl/isap.nsf/DocDetails.xsp?id=WDU20200000010. (Accessed 2026-11-12.)
- Ministerstwo Klimatu i Srodowiska. 2026. "Baza Danych o Odpadach (BDO): CAS 73-22-3." Warszawa: Ministerstwo Klimatu i Srodowiska. https://bdo.mos.gov.pl/. (Accessed 2026-11-12.)
- Pohanish, Richard P.. 2017. "Sittig's Handbook of Toxic and Hazardous Chemicals and Carcinogens." Elsevier.
- Lewis, Richard J.. 2012. "Sax's Dangerous Properties of Industrial Materials." Wiley.
- NIOSH. 2024. "Pocket Guide to Chemical Hazards." U.S. Department of Health and Human Services. https://www.cdc.gov/niosh/npg/.
- United Nations Economic Commission for Europe (UNECE). 2023. "European Agreement concerning the International Carriage of Dangerous Goods by Road (ADR 2025)." UNECE. https://unece.org/transport/standards/transport/dangerous-goods/adr-2025.
- IPCS INCHEM. 2024. "International Programme on Chemical Safety — Waste Management Guidelines." WHO/UNEP/ILO. https://www.inchem.org/.
- International Organization for Standardization. 2017. "ISO/IEC 17025:2017 General requirements for the competence of testing and calibration laboratories." ISO. https://www.iso.org/standard/66912.html.
- World Health Organization. 2010. "WHO Good Manufacturing Practices for Pharmaceutical Products: Main Principles (WHO Technical Report Series No. 957, Annex 3)." WHO Press. https://www.who.int/publications/m/item/trs957-annex3.
- European Medicines Agency. 2014. "Guideline on Process Validation for Finished Products — Information and Data to Be Provided EMA/CHMP/CVMP/QWP/BWP/70278/2012." European Medicines Agency. https://www.ema.europa.eu/en/documents/scientific-guideline/guideline-process-validation-finished-products-information-data-be-provided-regulatory-submissions-revision-1_en.pdf.
- United States Pharmacopeial Convention. 2024. "United States Pharmacopeia and National Formulary, USP 47-NF 42." USP. https://www.uspnf.com/.
- European Pharmacopoeia Commission. 2024. "European Pharmacopoeia 11th Edition." Council of Europe — EDQM. https://www.edqm.eu/en/european-pharmacopoeia-ph-eur-11th-edition.
- Pharmaceutical Inspection Co-operation Scheme (PIC/S). 2021. "Guide to Good Manufacturing Practice for Medicinal Products PE 009-15." PIC/S Secretariat, Geneva. https://picscheme.org/en/publications.
- International Pharmaceutical Excipients Council (IPEC) and Pharmaceutical Quality Group (PQG). 2017. "Joint IPEC-PQG Good Manufacturing Practices Guide for Pharmaceutical Excipients." IPEC-Americas. https://ipecamericas.org/sites/default/files/IPECPQGGMPGuide2017.pdf.
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