Hydroxycinnamoyl Glucose and Tartrate Esters and Their Role in the Formation of Ethylphenols in Wine
作者:Josh L. Hixson、Yoji Hayasaka、Christopher D. Curtin、Mark A. Sefton、Dennis K. Taylor
DOI:10.1021/acs.jafc.6b04074
日期:2016.12.14
hydroxycinnamoyl glucose esters during preparation were investigated to prevent these in subsequent synthetic attempts. Photoisomerization gave an isomeric mixture containing the trans-esters and undesired cis-esters, and acyl migration resulted in a mixture of the desired 1-O-β-ester and two additional migrated forms, the 2-O-α- and 6-O-α-esters. Theoretical studies indicated that the photoisomerization was facilitated
合成p -coumaroyl和阿魏升-酒石酸盐酯已提交酒香bruxellensis株AWRI 1499,1608 AWRI和AWRI 1613,以评估它们作为前体在酒乙基苯酚作用。没有观察到乙酚的放出。另外,合成了对-香豆酰基葡萄糖和阿魏酰基葡萄糖,并提交给B. bruxellensis AWRI 1499,其产生4-乙基苯酚和4-乙基愈创木酚。研究了在制备过程中羟基肉桂酰基葡萄糖酯的意外化学转化,以防止在随后的合成尝试中发生这些化学转化。光异构化得到含有反式酯和不希望的顺式的异构体混合物-酯,和酰基转移导致所需的1-的混合物ö和两个附加迁移形式-β-酯,2- Ò -α-和6- ö -α-酯。理论研究表明,苯酚的去质子化促进了光异构化,并且在酸性,非水处理过程中有利于酰基迁移。初步的LC-MS / MS研究观察到葡萄酒中迁移的羟基肉桂酰葡萄糖酯,首次允许鉴定红酒中的阿魏酰葡萄糖。