Journal
ANALYTICA CHIMICA ACTA
Volume 708, Issue 1-2, Pages 84-88Publisher
ELSEVIER
DOI: 10.1016/j.aca.2011.10.002
Keywords
Fluorescence detection; Benzoyl peroxide; Wheat flour; N-Methoxy rhodamine-6G spirolactam; Consecutive chemical reactions
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Funding
- National Basic Research Program of China [2011CB935800, 2010CB933502]
- NSF of China [20935005]
- Chinese Academy of Science [KJCX2-EW-N06-01]
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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 Fe2+ into Fe3+ and the resulting Fe3+ 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. (C) 2011 Elsevier B.V. All rights reserved.
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