蓝莓粉散装蓝莓果汁粉
花青素,具有糖基团的花青素主要是花青素的3-葡糖苷。花色素苷被细分为无糖花旗苷苷元和花青素苷。据报道,截至2003年,已有超过400种花青素被报道[35],而最近的文献(2006年初)则将其分布在550多种不同的花青素上。响应于pH变化而发生的化学结构的差异是花青素经常用作pH指示剂的原因,因为它们在碱中从酸变成蓝色。。花青素被认为在体内和体外受到物理化学降解。结构,pH,温度,光,氧,金属离子,分子内缔合和与其他化合物的分子间缔合(副产物,糖,蛋白质,降解产物等))通常已知会影响花青素的颜色和稳定性。[36]已经显示B环羟基化状态和pH调节花青素对其酚酸和醛成分的降解。[37]事实上,摄入花青素的重要部分在消费后可能在体内降解成酚酸和醛。这种特征使体内特异性花青素机制的科学分离困扰。
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