花青素

Anthocyanidins are common plant pigments.花青素是常见的植物色素。 They are the sugar-free counterparts of anthocyanins based on the flavylium ion or 2-phenylchromenylium (chromenylium is referred also to as benzopyrylium).它们是基于黄酮离子或2-苯基铬chrome的花色苷的无糖对应物（铬ny也称为苯并吡啶）。 They form a large group of polymethine dye.它们形成大量的聚次甲基染料。 In particular anthocyanidins are salt derivatives of the 2-phenylchromenylium cation, also known as flavylium cation.特别是，花青素是XNUMX-苯基铬鎓阳离子的盐衍生物，也称为黄酮阳离子。 As shown in the figure below, the phenyl group at the XNUMX-position can carry different substituents.如下图所示，XNUMX-位的苯基可以带有不同的取代基。 The counterion of the flavylium cation is mostly chloride.黄酮阳离子的抗衡离子主要是氯。 With this positive charge, the anthocyanidins differ from other flavonoids.在带正电荷的情况下，花色素与其他类黄酮不同。
3-脱氧花青素是一类在碳3上缺乏羟基的花青素。