Analysis of Preparation of Starch-lipid Complex by Repeated/Continuous Heat-moisture and Its Properties
The preparation methods of starch-lipid complex have some imperfections such as low preparation rate,com-plicated process and industrial waste liquid pollutants.In this study,high amylose corn starch-soybean lecithin complex with higher recombination rate was prepared by repeated/continuous alternating heat-moisture technique,and the struc-ture,physicochemical properties and predictive glycemic index of the optimized complex were investigated.The results showed that the optimum recombination condition was performed by single factor and orthogonal experiment to obtain the highest recombination rate,namely,the heat-moisture treatment temperature was 140 ℃,the continuous heat-moisture treatment time was 4 h,repeated heat-moisture treatment number was 6 times,and alternating cycle was 2 periods.The recombination rate at above conditions was as high as 59.05％.Fourier infrared spectroscopy found that two similar inten-sity absorption peaks of soybean lecithin at 2 710 cm-1 and 2 680cm-1 did not appear in the compound,demonstrating that the modification technology could compound soybean lecithin in the spiral cavity of starch.X-ray diffraction pattern observed that the peak intensity at the diffraction angle 20° of the complex increased significantly.In addition,the freeze-thaw stability of the complex was significantly improved,and the predictive glycemic index was obviously reduced.Therefore,repeated/continuous alternating heat-moisture technology as a green,safe,and easy-operating physical measure was an effective means to improve the recombination rate of starch-lecithin complex,and significantly reduced the preGI of starch.This provides new ideas for the development of starch composites.
high amylose corn starchlecithincomplexheat-moisture treatmentpredictive glycemic index
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