Methods Benzoyl peroxide in flour was extracted by aether and deoxidized into benzoic acid by reducing agent,and the extracts were determined by GC with FID.

• 方法面粉中过氧化苯甲酰被还原剂还原成苯甲酸,经乙醚提取,用FID检测,外标法定量。面粉中苯甲酸被乙醚提取后,用FID检测,外标法定量。