Riboflavin content of canteen meals

Abstract

CYSTEINE-(CYSTINE-) TYROSINE PEPTIDES 423 2. It is shown that both the N-carbobenzyloxy derivatives and to a smaller but significant extent the free peptides are hydrolyzed by crystalline pepsin; the hydrolysis is more rapid at pH 4*0 than at pH .1*8. The bearing of these results on Bergmann's theory of the conditions determining peptic action is discussed. .3. The cysteine derivatives are more susceptible to peptic hydrolysis than the corresponding compounds containing cystine; this observation is considered in relation to the fact that pepsin attacks proteins more rapidly after denaturation which is-itself accompanied by the appearance of-SH groups.

Media Used for Microbiological Assay of Riboflavin using Lactobacillus casei

“…In previous studies, response related to the arithmetic increase in dose in a linear fashion has been stressed (8,17) especially if doses lower than about 0.20 microgram of riboflavin are considered. Kerly (8) used a 24-hour incubation period because "this shorter time was found to give a more nearly linear relationship between acid production and riboflavin content."…”