Nitrogen balance was studied in growing male SPF-rats fed on diets in which each essential amino acid was varied from zero to about 120% of optimum requirement. From the balance results, optimum and maintenance requirements were estimated as well as the efficiency of utilization of amino acids for growth and growth + maintenance. N balance increased with increasing dietary level of the deficien...

Intestinal perfusion studies performed in man have suggested that amino acid nitrogen may be absorbed more rapidly from peptides than free amino acids. The aim of the present study was to compare the effects of the oral administration of peptides and free amino acids. Two isonitrogenous liquid test meals, one containing 50 g of a partial enzymic hydrolysate of fish protein in which approximatel...

Quantification of amino acids in sugarcane juice by gas chromatography has been reported for the first time. The method involves the removal of free amino acids from previously deproteinated cane juice by absorption onto cation exchange resin. Desorbed amino acids are then converted into their butyl esters which, when subjected to GC on a 50% phenyl-50% methyl polysiloxane (RTX-50) column, appe...

Protein can be hydrolyzed, producing small chains of amino acids called peptides. Several studies have shown that protein hydrolysates containing mostly di- and tripeptides are absorbed more rapidly than free form amino acids and much more rapidly than intact proteins. In addition, there is recent evidence that protein hydrolysate ingestion has strong insulinotropic effect. Thus, recovery sport...

The concentration of free amino acids in amniotic fluids, obtained from 27 normal mothers between the eighth and 22nd weeks of gestation, was determined by cation-exchange chromatography. Of the 29free amino acids detected, three-7-aminobutyric acid, ethanolamine, and homocarnosinehad not previously been found in amniotic fluid. The seven most common (in descending order) are alanine, glutamic ...

The concentrations of 22 free amino acids in plasma from 12 normal subjects and 10 patients with malignant melanoma were determined by ion exchange chromatography. There were no statistically significant differences between the 2 groups. Twentyfour-hr urine specimens from 15 normal individuals and 13 patients with disseminated melanoma were analyzed for 32 free amino acids or related compounds....

Nitrogen in the ethanol extract of the fruiting bodies of the common edible mushroom, Agaricus bisporus, accounted for about 60% of the total nitrogen of the fruiting bodies, and about 70% of the ethanol-extractable nitrogen was attributable to the free amino acids and their derivatives. Identification and quantitative determination of the free amino acids and their derivatives contained in thi...

The process of leaf senescence is biochemically characterized by the transition from nutrient assimilation to nutrient remobilization. The nutrient drain by developing vegetative and reproductive structures has been implicated in senescence induction. The steady-state levels of amino acids in senescing leaves are dependent on the rate of their release during protein degradation and on the rate ...

to determine the amount of food amino acid and to spend time in the laboratories are expensive & time-consuming due to a chemical analysis. in the current laboratories, digestion nirs method is widely used for this purpose. but this method has technical limitation. therefor is important find appropriate method for estimate amount of amino acids. artificial neural network (ann) can provide a bet...

Biogenic Amines (BAs) are low molecular weight organic bases with biological activity that are formed in foods by either microbial decarboxylation of the corresponding amino acids or transamination of aldehydes and ketones by amino acid transaminases [1]. The most important BAs including histamine, tyramine, tryptamine, putrescine, and cadaverine are formed from free amino acids namely histidin...