Microbiological determination of phenylalanine in proteins and foods.

Microbiological determination of methionine in proteins and foodstuffs.

Kuiken and coworkers (1) reported that methionine is not essential for the growth of Lactobacillue arabinosus 17-5. Later, Hegsted (2), working with the same organism, found that growth failed when methionine was not present in the medium. He called att,ention to the apparent discrepancy in the results obtained in the two laboratories and stated that it was probably due to the use of different ...

Microbiological determination of leucine in proteins and foods.

Colorimetric determination of methionine in proteins and foods.

Most of the earlier methods for the quantitative determination of amino acids are applicable only to purified proteins. Interfering reactions with non-protein substances, particularly carbohydrates, preclude their use for determining amino acids in foods. Great interest has recently developed in the amino acid content of foods, particularly the so called nutritionally essential amino acids. Met...

A New Potentiometric Sensor for Determination and Screening Phenylalanine in Blood Serum Based on Molecularly Imprinted Polymer

Methods routinely utilized for detection of phenylalanine in new-born blood consist of enzymatic assays, lacking sensitivity and HPLC assays which are expensive and time-consuming to conduct. We, here, report for the first time, the construction of a phenylalanine sensitive electrode, on the basis of a selective molecularly imprinted polymer, offering sensitivity, economy and ease of use for th...

A New Potentiometric Sensor for Determination and Screening Phenylalanine in Blood Serum Based on Molecularly Imprinted Polymer

Methods routinely utilized for detection of phenylalanine in new-born blood consist of enzymatic assays, lacking sensitivity and HPLC assays which are expensive and time-consuming to conduct. We, here, report for the first time, the construction of a phenylalanine sensitive electrode, on the basis of a selective molecularly imprinted polymer, offering sensitivity, economy and ease of use for th...