Strecker Type Degradation of Phenylalanine by 4-Hydroxy-2-nonenal in Model Systems
作者:Francisco J. Hidalgo、Emerenciana Gallardo、Rosario Zamora
DOI:10.1021/jf052240+
日期:2005.12.1
4-Hydroxy-2-nonenal and 4,5-epoxy-2-decenal degraded phenylalanine in an analogous extent, which is likely a consequence of the similarity of the degradation mechanisms involved. These results suggest that different lipid oxidation products are able to degrade amino acids; therefore, the Strecker type degradation of amino acids produced by oxidized lipids may be quantitatively significant in foods.
研究了氧化应激产物4-羟基-2-壬烯醛与苯丙氨酸在乙腈-水(2:1、1:1和1:2)中在37、60和80摄氏度下的反应,以确定是否4-羟基-2-烯醛类似于4,5-环氧-2-烯基降解氨基酸,并比较羟基烯醛和环氧烯醛的反应性,以生产Strecker醛。除了形成N-取代的2-戊基吡咯和2-戊基呋喃外,所研究的羟基烯醛还将苯丙氨酸降解为苯乙醛,反应产率为17%。建议通过相应的亚胺产生反应机理,然后将其脱羧并水解。该反应还产生了共轭胺,它们可能都是产生的2-戊基-1H-吡咯的来源之一,并且可能有助于这些反应中的褐变。4-羟基-2-壬烯醛和4,5-环氧-2-癸烯降解苯丙氨酸的程度相似,这可能是所涉及的降解机理相似的结果。这些结果表明,不同的脂质氧化产物能够降解氨基酸。因此,在食物中,由氧化脂质产生的氨基酸的Strecker型降解可能在数量上很重要。