Citation: Yong Nian Ni, Yue Rong Wang, Serge Kokot. Osteryoung square wave voltammetric determination of lactose in food samples by a derivative procedure[J]. Chinese Chemical Letters, ;2008, 19(12): 1491-1494. doi: 10.1016/j.cclet.2008.09.052 shu

Osteryoung square wave voltammetric determination of lactose in food samples by a derivative procedure

a State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, China;
b Department of Chemistry, Nanchang University, Nanchang 330031, China;
c School of Physical and Chemical Sciences, Queensland University of Technology, Brisbane 4001, Australia

Received Date: 11 June 2008

Fund Project: The financial supported from the National Natural Science Foundation (No. 20562009), the State Key Laboratory of Electroanalytical Chemistry of Changchun Applied Chemical Institute (No. 2004-3), the Jiangxi Provincial Natural Science Foundation (No. 0620041), and the Program for Changjiang Scholar and Innovative Research Team in Universities (No. 0540).

A method for determination of lactose in food samples by Osteryoung square wave voltammetry (OSWV) was developed. It was based on the nucleophilic addition reaction between lactose and aqua ammonia. The carbonyl group of lactose can be changed into imido group, and this increases the electrochemical activity in reduction and the sensitivity. The optimal condition for the nucleophilic addition reaction was investigated and it was found that in NH₄Cl-NH₃ buffer of pH 10.1, the linear range between the peak current and the concentration of lactose was 0.6-8.4 mg L^-1, and the detection limits was 0.44 mg L^-1. The proposed method was applied to the "determination of lactose in food samples and satisfactory results were obtained.
- Osteryoung square wave voltammetty,
- Lactose,
- Food,
- Milk
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