purple sweet potato pigments

• 紫甘薯色素

purple sweet potato pigments的用法和样例：

例句

1. Purple sweet potato colorant is a natural anthocyanin pigment derived from purple sweet potato storage roots.
   紫色甘薯色素是从紫色甘薯块根中浸提出来的一种天然食用花青素类色素。