A kind of preparation method of selenium-enriched starch

Abstract

The invention relates to the technical field of starch modification, in particular to a preparation method of selenium-enriched starch. The method comprises the following steps: (1) placing an appropriate amount of selenium powder and sodium borohydride in a round-bottomed flask, adding an appropriate amount of ethanol and water mixed solution, and reacting at room temperature under nitrogen protection to obtain a NaSeH stock solution; (2) adding an octenyl Starch succinate (OSA starch, 10g) was placed in a round bottom flask, added a mixed solvent of ethanol and water, stirred for 30min and mixed evenly; (3) NaSeH stock solution and sodium hydroxide solution were added dropwise to In the reaction system, stop the reaction after reacting for a certain period of time; (4) after adjusting the pH of the reaction solution to 3-4, add the solution dropwise into an ethanol solvent to precipitate the starch, stir for 20 minutes and filter to collect the filter cake, and then use 75% Wash the filter cake with ethanol and absolute ethanol, and dry the filter cake in a vacuum drying oven to obtain a selenized starch sample. The series Se-starch prepared by the present invention exhibits typical GPx enzymatic catalytic behavior, and its catalytic activity is 1.53×10 of that of the classic small-molecule antioxidant selenium enzyme PhSeSePh. 5 times.

Description

technical field [0001] The invention relates to the technical field of starch modification, in particular to a preparation method of selenium-enriched starch. Background technique [0002] With the continuous enhancement of people's health and health awareness, it is of great significance to develop functional foods that play a positive role in maintaining human health. The trace element selenium can participate in the synthesis of 25 kinds of selenium-containing proteins in the human body, especially it can participate in the formation of selenocysteine, the catalytic center of glutathione peroxidase (GPx), and play a role in removing excess free radicals in the human body. It can protect people from oxidative damage and resist inflammation, cancer, Keshan disease and other diseases. [0003] In view of the important antioxidant effect of selenium, developing new technologies for selenium-enriched functional products and providing new ideas for scientific supplementation o...

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Problems solved by technology

[0004] Although the above measures have achieved good results, there are still two major problems in the field of selenium-enriched starch development: one is that the time period for plant growth to transform and absorb selenium is relatively long, and it is greatly affected by environmental changes, resulting in selenium-enriched starch. The selenium content in starch is unstable; the second is that selenium-rich starch needs to be transformed into GPx by the human body to exert its antioxidant effect, and cannot directly exert its antioxidant effect, which brings great limitations to its market acceptance and industrialization promotion

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