Co-production method for inulin and fructo-oligose syrup

Abstract

The invention relates to a co-production method for inulin and fructo-oligose syrup by taking fresh or dry jerusalem artichoke or endive as the raw material. The method comprises the following steps: pre-treating the raw material, digesting, filtering, desalting, concentrating and crystallizing. According to the invention, an inulin preparation process is simplified, the reaction condition is relatively mild, the equipment investment is less and the energy consumption is low; the purity of the prepared inulin is above 96%, the extraction ratio of inulin is above 90% and the content of fructo-oligose in the fructo-oligose syrup is above 75%; the additional value of jerusalem artichoke or endive deep processing is greatly increased; the method also can meet the requirement for high-quality inulin and fructo-oligose syrup products in the domestic market.

Description

【Technical field】 [0001] The invention belongs to the technical field of food processing. More specifically, the present invention relates to a method for co-production of inulin and fructo-oligosaccharide syrup. 【Background technique】 [0002] Inulin, also known as inulin, is a chain polysaccharide composed of D-fructofuranose linked by β-(2,1) glycosidic bonds. The end often contains an α-D-glucose group, and its molecular formula is expressed as GF n or F m , where G is the terminal glucose unit (Glucose), F represents the fructose molecule (Fructose), n or m represents the fructose unit, and the degree of polymerization of inulin is generally 2-60. Inulin is widely present in plant tissues, and more than 36,000 kinds of plants contain inulin, especially Jerusalem artichoke and chicory are rich in inulin, accounting for more than 70% of the dry weight of their tubers, so Jerusalem artichoke and chicory are often used to extract inulin pink. [0003] Inulin is a natura...

AI Technical Summary

Problems solved by technology

Among them, the extraction temperature commonly used in the hot water extraction method is high, and the crude extract contains more impurities such as protein, pectin, pigment, organic acid, etc. The method usually used is lime milk to remove impurities, and the general lime milk treatment is the best The pH is between 10-12, high temperature and acid-alkaline process conditions require high equipment investment, high energy consumption and pollution

In the further purification process, due to the poor solubility of inulin, some inulin will be mixed in the resin and activated carbon during the traditional ion exchange desalination and activated carbon decolorization process, which will affect the life of the resin and the extraction rate of inulin.

[0007] Inulin and fructooligosaccharide series products derived from Jerusalem artichoke or chicory are ideal functional sugar sources and have a broad market space. However, the purity and output of domestic inulin cannot meet the needs of the domestic market. High purity and high quality Most of the inulin and fructo-oligosaccharides are imported from abroad

However, my country's Jerusalem artichoke and chicory are rich in resources, and they have low requirements for growing conditions, especially Jerusalem artichoke is suitable for planting on barren, arid, saline-alkali non-cultivated land, but the main purpose of domestic Jerusalem artichoke and chicory is to make pickles, vegetables and Feed, low added value of resources, few deep-processed products