水果和蔬菜制品 5-羟甲基糖醛含量的测定

[中文适用范围]： 该方法包括通过向测试部分中添加水来制备测试溶液，如果产品每升含有超过10毫克游离二氧化硫，则添加乙醛，然后将对甲苯胺和巴比妥酸溶液添加到等分试样中取供试品溶液，与存在的5-羟甲基糠醛反应显红色，在550nm波长处进行光谱测定。 [外文原描述]： The method comsists in preparing of a test solution by adding water to test portion, in the case of products containing more than 10 mg of free sulphur dioxide per litre, adding of acetaldhyde, then adding of p-toluidine and barbituric acid solution to an aliquot potion of the test solution, thus forming a red coloration by reaction with 5-hydroxymethylfurfural present, and spectrometric measuring at a wavelenght of 550nm.