Yeast products with antioxidation and selenium-supplementing functions and preparation method thereof

Abstract

The invention discloses a yeast product with antioxidation and selenium-supplementing functions and a preparation method thereof. The preparation method comprises the following steps: (1) adding sodium selenite to saccharomyces serevisiae in a logarithmic growth phase and / or the growth stationary phase, obtaining bacterial liquid after the fermentation, and centrifuging and drying obtained thalli;(2) carrying out inactivation on the obtained thalli to ensure that endoenzyme of the saccharomyces serevisiae keeps active while the saccharomyces serevisiae is dead; (3) adding neutral protease, papain and NaCl into inactivated thalli, carrying out enzymolysis autolysis under an anaerobic condition; (4) collecting the autolysis solution obtained in step (3) for centrifugation, and carrying outfreeze-drying on the obtained precipitate, thereby obtaining a yeast product. The yeast product produced by the preparation method provided by the invention has high selenium content, simultaneously possesses the antioxidation property, and helps animals to digest and absorb organic selenium, and is a yeast product which has the antioxidation and selenium supplementing functions.

Description

technical field [0001] The invention belongs to the field of feed, and more specifically relates to a yeast product with functions of anti-oxidation and selenium supplementation and a preparation method thereof. Background technique [0002] Yeast can be used as a carrier to convert inorganic selenium into organic selenium, and can also produce glutathione through fermentation. Selenium-enriched yeast has become a high-quality feed exogenous selenium additive in the market in recent years because of its high content of organic selenium and glutathione. First of all, selenium is an important part of glutathione peroxidase. The function of glutathione peroxidase is to catalyze the redox reaction between reduced glutathione and peroxide, which can play an antioxidant role. The enrichment of selenium in animals is beneficial to the production of this enzyme; secondly, the glutathione contained in yeast itself contains an active sulfhydryl-SH, which is easy to be oxidized and de...

AI Technical Summary

Problems solved by technology

[0003] However, the current use of selenium-enriched yeast in the industry has not been optimized. The specific problems are as follows: 1. The selenium absorption rate of active yeast used in the market is not high in piglets. The main reason is that yeast cell wall cracking requires strong enzymes The role of yeast autolysis in the intestinal tract requires a certain process, and the release of selenoproteins in yeast in the digestive tract is often not thorough enough

2. The selenoprotein obtained by yeast autolysis has a large molecular weight, such as selenoprotein P (Selenoprotein P) contains 10 molecules of selenocysteine, which is not easily absorbed by piglets without further hydrolysis into small peptides

3. The content of glutathione in selenium-enriched yeast is relatively high, and its anti-oxidation function is strong. In the process of hydrolyzing yeast selenium on the market, the sulfhydryl-SH contained in glutathione is often oxidatively dehydrogenated due to the lack of strict oxygen barrier in the operating environment. In addition, people often only pay attention to the absorption and utilization rate of selenium, and do not pay enough attention to anti-oxidation, ignoring its anti-oxidation function

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