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In this experiment, the ordinary cotton walnut as test materials, coating walnut walnut , nuts and coating during storage in acid value , peroxide value , iodine value , saponification value , sensory evaluation and lipase, lipoxygenase enzyme , peroxidase activity analysis , research coating the walnut Kazakhstan defeated inhibitory effect , in order to extend the storage period . SPI coating of walnut nuts . The study found that walnut nuts during storage , SPI coating , packaging of walnut nuts Kazakhstan defeated not significant , significant storage temperature on the of walnut nuts Kazakhstan defeated . Walnut nuts at 7 ℃, vacuum packaging conditions opaque storage , SPI coating can be inhibited to some extent walnut nuts Kazakhstan defeated . In addition to using SPI coating walnut , using a combination of antioxidants VC , TBHQ , Cys coating . The results obtained during storage , the coating on the inhibitory effect of the walnut Kazakhstan defeated SPI 0.02% TBHQ 0.015% Vc 0.07% Cys · coating gt ; SPI 0.02 % TBHQ 0.015% VC coating gt ; SPI 0.07 % Cys to 0.02% TBHO coating gt ; SPI 0.015 % VC 0.07% Cys coating gt ; the SPI 0.02 percent the TBHQ coating GT ; the SPI 0.07 Cys coating gt ; SPI 0.015 % Vc coating gt ; SPI coating . Packing analysis of storage temperature and film walnut , walnut in 7 ° C , vacuum opaque packaging under the conditions of storage , SPI 0.02 % TBHQ 0.015 % Vc 0.07 % Cys coating inhibit its defeat the best . Walnuts in the process of storage , the lipase for the hydrolysis of fats , so that the grease has an acid value increases, the acceleration walnut hydrolysis defeat ; lipoxygenase oxidation of linoleic acid oils to produce hydrogen peroxide , so that the grease peroxide value increased, leading to oxidation of walnut defeat ; peroxidase - catalyzed decomposition of hydrogen peroxide to accelerate the oxidation of walnut defeat . SPI coating of the three walnut nuts and walnuts little effect on enzyme activity , inhibition of its defeat , the effect is not obvious ; to contain antioxidants VC , TBHQ , Cys coating walnut three activity greater impact , significantly inhibit the effect of its defeat , and antioxidants Vc TBHQ , Cys composite use better than single-use effect .
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