title: Simple and fast fluorescence detection of benzoyl peroxide in wheat flour by N-methoxy rhodamine-6G spirolactam based on consecutive chemical reactions.
abstract: Benzoyl peroxide (BPO) as a brightener is often added to wheat flour, and excessive use of this food additive is receiving increasing concern. Herein, a simple and fast method for fluorescence detection of BPO is proposed based on consecutive chemical reactions. In this approach, BPO first oxidizes Fe(2+) into Fe(3+) and the resulting Fe(3+) then induces the opening of the spirolactam ring of a new rhodamine derivative, N-methoxy rhodamine-6G spirolactam, switching on fluorescence of the detection system. More importantly, the fluorescence response of the reaction system to BPO is rather rapid and sensitive, with a detection limit of 6 mg kg(-1) (k=3), which makes it to be of great potential use in food safety analysis. The applicability of the proposed method has been successfully demonstrated on the determination of BPO in wheat flour samples.
authors.affiliation: Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Chen
authors.forename: Wen
authors.initials: W
authors.lastname: Shi
authors.forename: Zhao
authors.initials: Z
authors.lastname: Li
authors.forename: Huimin
authors.initials: H
authors.lastname: Ma
authors.forename: Yang
authors.initials: Y
authors.lastname: Liu
authors.forename: Jinghua
authors.initials: J
authors.lastname: Zhang
authors.forename: Qingjun
authors.initials: Q
authors.lastname: Liu
mesh_terms: D001585:Benzoyl Peroxide / Q000032:analysis*; D005290:Ferric Compounds / Q000737:chemistry; D005296:Ferrous Compounds / Q000737:chemistry; D005433:Flour / Q000032:analysis*; D007769:Lactams / Q000737:chemistry; D010084:Oxidation-Reduction; D012235:Rhodamines / Q000138:chemical synthesis*; D013050:Spectrometry, Fluorescence; D014908:Triticum
chemical_list: D005290:Ferric Compounds; D005296:Ferrous Compounds; D007769:Lactams; D012235:Rhodamines; D001585:Benzoyl Peroxide