Chlorella exopolysaccharide with antioxidant activity

Abstract

The invention discloses a chlorella exopolysaccharide with antioxidant activity. The chlorella exopolysaccharide disclosed by the invention is secreted by chlorella having undergone liquid culture under the conditions of salt stress and a light-dark alternating mode and is eventually prepared through separation and purification. The chlorella exopolysaccharide has an average relative molecular weight of 131.79 kDa, and is mainly composed of, by mol, 19.81% of xylose, 79.93% of mannose and 0.25% of ribose. According to the invention, extracellularly-secreted polysaccharide is separated from a chlorella fermentation medium environment for the first time, and the obtained chlorella exopolysaccharide has an obvious dose effect on removal of DPPH free radicals, superoxide anions, hydroxyl radicals and ABTS radicals. Through the utilization of exopolysaccharides secreted to a culture medium in a microalga culture process, can the high additional value of the byproducts can be fully excavated, a new thought can be provided for lowering the production cost of microalgal oil for biodiesel preparation, and obvious social and economic benefits are obtained.

Description

technical field [0001] The invention relates to the field of development and application of food resources, in particular to a chlorella exopolysaccharide with antioxidant activity. Background technique [0002] Microalgae have become one of the ideal raw materials for the preparation of biofuels due to their advantages such as short growth cycle, no occupation of agricultural land, and high oil synthesis efficiency. Their research and development investment has positive significance for alleviating my country's energy pressure, controlling air pollution, and sustainable social and economic development. . However, microalgae-based biofuel refining has not been industrialized due to its low economic feasibility, and one of the main reasons is the high production cost of microalgae oil. Therefore, how to reduce the cost of microalgae oil is one of the effective ways to realize the commercialization of microalgae biodiesel. [0003] At present, many researchers have expanded m...

AI Technical Summary

Problems solved by technology

Although the above-mentioned strategy of using microalgae oil to co-produce other intracellular components simultaneously expands the application range of microalgae and reduces the production cost of microalgae oil to a certain extent, the above-mentioned co-production components are all intracellular components. It greatly increases the cost of separation and extraction in the subsequent separation and preparation process, and some components such as astaxanthin exist in algae cells in the form of esterification, which is difficult to separate and extract, and has little effect on reducing the production cost of microalgae oil

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