Microbiological Determination of Phenylalanine in Proteins and Foods

Food

“…Leuconostoc mesenteroides has been employed for the assay of phenylalanine (64), leucine (65), and isoleucine (66) in proteins and foods. In the latter paper, attention is drawn to the impurity of most commercial samples of this amino acid; a sample w'hich gave no change in acid production after repeated recrystallization from dilute alcohol wras considered sufficiently pure for use as a standard.…”

“…This section discusses the sampling and analysis of such fuels as coal, coke, wood charcoal, and briquets. SAMPLING Manning (64) shows that the accuracy with which a sample of coal represents the bulk can be calculated from the weight of the sample taken, the particle-size distribution, and the results of the float-sink test. His theory is developed from the calculated distribution of samples drawn at random from a mixture of two different kinds of particles and extended to ternary mixtures.…”