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Properties of substance:

L-tryptophan



skc-file

Group of substances:

organic

Physical appearance:

colorless crystals

Empirical formula (Hill's system for organic substances):

C11H12N2O2

Molar/atomic mass: 204.22

Melting point (°C):

293

Decomposition temperature (°C):

293

Solubility (g/100 g of solvent):

acetic acid: 0.81 (18°C) [Ref.]
butyric acid: 0.055 (18°C) [Ref.]
chloroform: insoluble [Ref.]
diethyl ether: insoluble [Ref.]
ethanol: sparingly soluble [Ref.]
ethanol: soluble (78°C) [Ref.]
water: 0.823 (0°C) [Ref.]
water: 0.872 (5°C) [Ref.]
water: 0.927 (10°C) [Ref.]
water: 0.988 (15°C) [Ref.]
water: 1.057 (20°C) [Ref.]
water: 1.14 (25°C) [Ref.]
water: 1.223 (30°C) [Ref.]
water: 1.323 (35°C) [Ref.]
water: 1.435 (40°C) [Ref.]
water: 1.562 (45°C) [Ref.]
water: 1.706 (50°C) [Ref.]
water: 1.87 (55°C) [Ref.]
water: 2.057 (60°C) [Ref.]
water: 2.27 (65°C) [Ref.]
water: 2.514 (70°C) [Ref.]
water: 2.79 (75°C) [Ref.]
water: 4.987 (100°C) [Ref.]

Numerical data:

Bitter taste threshold concentrations (mM): 3.79

Dissociation:

pKBH+ (1) = 2.38 (25°C, water)
pKa (1) = 9.39 (25°C, water)

References:

  1. Dictionary of organic compounds. - Vol. 3, naphthacarbazole - zygadenine. - М.: ИИЛ, 1949. - pp. 897
  2. Kleemann A. Pharmaceutical Substances. - 2000. - pp. 2139-2141
  3. Seidell A. Solubilities of organic compounds. - 3ed., vol.2. - New York: D. Van Nostrand Company, 1941. - pp. 689
  4. Yalkowsky S.H., Yan H. Handbook of aqueous solubility data. - CRC Press, 2003. - pp. 735
  5. Губен И. Методы органической химии. - Т. 2, Вып. 1. - М.-Л., 1941. - pp. 210 [Russian]
  6. Губен И. Методы органической химии. - Т. 4, Вып. 2. - М.-Л.: ГНТИХЛ, 1949. - pp. 911 [Russian]
  7. Досон Р., Эллиот Д., Эллиот У., Джонс К. Справочник биохимика. - М.: Мир, 1991. - pp. 34 [Russian]
  8. Крутошикова А., Угер М. Природные и синтетические сладкие вещества. - М.: Мир, 1988. - pp. 16 [Russian]
  9. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 184 [Russian]
  10. Справочник по растворимости. - Т.1, Кн.1. - М.-Л.: ИАН СССР, 1961. - pp. 515 [Russian]
  11. Справочник по растворимости. - Т.1, Кн.2. - М.-Л.: ИАН СССР, 1962. - pp. 1326 [Russian]
  12. Химическая энциклопедия. - Т. 5. - М.: Советская энциклопедия, 1999. - pp. 5 [Russian]
  13. Химический энциклопедический словарь. - Под ред. Кнунянц И.Л. - М.: Советская энциклопедия, 1983. - pp. 594 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru