A comprehensive investigation of guaiacyl-pyranoanthocyanin synthesis by one-/two-dimensional NMR and UPLC–DAD–ESI–MSn
作者:Anna Vallverdú-Queralt、Emmanuelle Meudec、Nayla Ferreira-Lima、Nicolas Sommerer、Olivier Dangles、Véronique Cheynier、Christine Le Guernevé
DOI:10.1016/j.foodchem.2015.12.089
日期:2016.5
progressively converted to more stable pigments, including phenylpyranoanthocyanins. One-/two-dimensional NMR and UPLC-DAD-ESI-MS(n) measurements were used to monitor the synthesis of guaiacylpyranomalvidin 3-O-glucoside from malvidin 3-O-glucoside and vinylguaiacol in model solutions and identify the products formed during the reaction. The highest conversion rates (30%, determined by (1)H qNMR) were obtained
在红葡萄酒和桃红葡萄酒中,葡萄花色苷逐渐转化为更稳定的色素,包括苯基吡喃花色素。一维/二维NMR和UPLC-DAD-ESI-MS(n)测量用于监测模型溶液中由麦维汀3-O-葡糖苷和乙烯基愈创木酚合成愈创甘油吡喃型麦维京酯3-O-葡糖苷的过程并鉴定在此过程中形成的产物反应。用少量过量的乙烯基愈创木酚在pH 3和35°C的甲醇/水(70/30)中可获得最高的转化率(30%,由(1)H qNMR测定)。两种反应途径与愈创甘油吡喃麦芽抗生物素3-O-葡萄糖苷的形成竞争。第一个只涉及malvidin 3-O-葡萄糖苷,并且在于形成丙二酮和较小分子量分解产物的C环裂解。在较高的pH和温育温度下,该途径是有利的。