Changes in food proteins reacted with nitrite at gastric pH
作者:
NatakeMasato,
UedaMikio,
期刊:
Nutrition and Cancer
(Taylor Available online 1986)
卷期:
Volume 8,
issue 1
页码: 41-45
ISSN:0163-5581
年代: 1986
DOI:10.1080/01635588609513875
出版商: Taylor&Francis Group
数据来源: Taylor
摘要:
AbstractCasein and egg albumin were reacted with nitrite at pH3. The reaction mixtures containing nitrite yellowed when the reaction began; after 24 hours of reaction with 7.5×10‐3M nitrite, about 70% of added casein was sedimented as yellow precipitate. There was a considerable loss of lysine, arginine, tyrosine, and tryptophan residues. This was determined from the amino acid compositions of the proteins obtained by the reaction with 2.5×10‐2M nitrite at pH 3 for 48 hours. An amino acid elution pattern of the treated casein showed five peaks due to new amino acids; three of these were provisionally identified to be cysteic acid, methionine sulfone, and 3‐nitrotyrosine.
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