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目前我国对面粉中的过氧化苯甲酰的测定方法主要有气相色谱法和液相色谱法,前者操作复杂,实用性较差;后者仪器过于昂贵,不利于推广。笔者用铁粉与盐酸反应产生原子态的氢将过氧化苯甲酰还原为苯甲酸,然后利用二阶导数紫外分光光度法测定苯甲酸的浓度,间接计算面粉中过氧化苯甲酰的添加量。1对象与方法1.1主要仪器和试剂紫外分光光度计(U—2000,日立仪器有限公司);电子分析天平(EL-206,梅特勒
At present, the main methods for the determination of benzoyl peroxide in flour are gas chromatography and liquid chromatography. The former has complicated operation and poor practicability. The latter is too expensive for promotion. The author uses iron powder and hydrochloric acid to produce atomic hydrogen hydrogen peroxide benzoyl reduced to benzoic acid, and then use the second derivative UV spectrophotometric determination of benzoic acid concentration, indirect calculation of the amount of flour in the benzoyl peroxide . 1 Subjects and methods 1.1 The main instruments and reagents UV spectrophotometer (U-2000, Hitachi Instrument Co., Ltd.); electronic analytical balance (EL-206, Mettler