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。