Investigated the changing of components in leisure soybean food during storage by using Nuclear Magnetic Resonance (NMR),and identified the contribution from these components respectively, and discussed the corruption mechanism from the microscopic view. The results indicated that leisure soybean food had three kinds of components mobility-T21,T22,T23,corresponded bound water, free water and fat, respectively. By analyzing the component contents, the first three months was the best in quality for leisure soybeans. The oxidative rancidity of oil produced peroxide led to the oxidant of amino-acid residue, and transformed the bound water in reticulate structure into free water. When it came to the 9 month, there was obvious change within the leisure soybeans components, and its quality was been seriously decreased.

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