METHODS Use ultraviolet spectrophotometry to determine the content of Vitamin B2. The absorption of the sample which has been added with solution 1.4 percent sodium acetate is measured at 444nm.

• 方法使用紫外分光光度法测定维生素B2的含量。 本样品加入1.；4%25醋酸钠溶液；在444nm的波长处测定吸收度。