Citation: LI Xue, CAO Jun, BAI Xin-Peng, ZHANG Fang-Fang. Monitoring of Oxidation Process of Human Milk Lipid Substitutes by Molecular Fluorescence Spectroscopy[J]. Chinese Journal of Analytical Chemistry, ;2018, 46(4): 543-549. doi: 10.11895/j.issn.0253-3820.171230 shu

Monitoring of Oxidation Process of Human Milk Lipid Substitutes by Molecular Fluorescence Spectroscopy

College of Food Science and Technology, Hainan University, Haikou 570228, China

Received Date: 5 September 2017
Revised Date: 25 January 2018

Fund Project: This work was supported by the National Natural Science Foundation of China (No.31601579), the Project of Key Research and Development of Hainan Province (No.ZDYF2016093) and the Research Foundation of Hainan Higher Education Institutions (No.Hnky2016ZD-1).

The fatty acid contents in soybean oil, corn oil, coconut oil, sunflower seed oil and fish oil were detected by gas chromatography. According to the characteristics of fatty acids of raw oil and the relevant regulations of GB 10765-2010, the formula of 6 kinds of human milk lipid substitutes was designed by Matlab software and Excel linear programming. At the same time, the Schaal oven accelerated oxidation method was used to study the oxidation process of 6 formulations using synchronous fluorescence technique combined with traditional chemical reagents (oxidation index:peroxide value, value of fennel and total oxidation value). By statistical analysis of data, the statistical relationship between fluorescence intensity and oxidation index was explored. The results showed that the main fatty acids of coconut oil were lauric acid and myristic acid, and its saturated fatty acid content was the highest 93.75%±0.06%; while all the other oils were mainly composed of palmitic acid, linoleic acid and other components, wherein the fish oil had the highest content of unsaturated fatty acid. With the increase of oxidation time, the fluorescence intensity decreased gradually and the oxidation index value increased continuously. The correlation analysis and regression analysis results showed that the change of oxidation index and the fluorescence intensity of 6 samples had negative correlation, and the fluorescence intensity and the peroxide value and total oxidation value was quadratic linear correlation, and anisidine value as a linear correlation had strong correlation.
- Human milk lipid substitute,
- Schaal oven accelerated oxidation process,
- Oxidation index,
- Synchronous fluorescence
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