Practical physiological chemistry; a book designed for use in courses in practical physiological chemistry in schools of medicine and of science . Fig. 31.—Glutamic Acid. Reproduced from a micro-photograph made by Prof. E. T. Reichert, of the University of Pennsylvania. The glutamic acid, yielded by proteins upon hydrolysis, is dextro-rotatory. Crystals of glutamic acid are reproduced in Fig. 31. Proline, C5H9XO2.—Proline is a-pyrro\idinc-carhoxyUc acid andpossesses the following graphic structure: H2C CH2 HoC CHCnOH. NH Proline was llrst obtained as a decomposition product of casein. Pro-* Th
Practical physiological chemistry; a book designed for use in courses in practical physiological chemistry in schools of medicine and of science . Fig. 31.—Glutamic Acid. Reproduced from a micro-photograph made by Prof. E. T. Reichert, of the University of Pennsylvania. The glutamic acid, yielded by proteins upon hydrolysis, is dextro-rotatory. Crystals of glutamic acid are reproduced in Fig. 31. Proline, C5H9XO2.—Proline is a-pyrro\idinc-carhoxyUc acid andpossesses the following graphic structure: H2C CH2 HoC CHCnOH. NH Proline was llrst obtained as a decomposition product of casein. Pro-* Thierfelder and Sherwin: Zeil. Physiol. Chcmic, 94, 1, 1915. 84 PHYSIOLOGICAL CHEMISTRY line obtained from proteins is levo-rotatory and is the only protein de-composition product which is readily soluble in alcohol. It is also one ofthe few heterocyclic compounds obtained from proteins. Proline hasbeen found among the decomposition products of all proteins except the. Fig. 32.—LEVo-a-PROLiNE. protamines. The maximum yield reported is P^^ cent obtainedby Osborne and Clapp from the hydrolysis of hordein. Fischer andBoehner^ have obtained per cent from the hydrolysis of gelatin.
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