A preparation process for extracting stevioside and fermented feed through steam explosion treatment of stevia rebaudiana

Abstract

The invention belongs to the field of plant extraction, and specifically relates to a process for extracting stevioside by steam explosion treatment of stevia rebaudiana. The steps of the process are: 1) After cleaning the leaves of Stevia rebaudiana and filtering the surface moisture, put them into the steam explosion device for steam explosion. The steam explosion conditions are: temperature 130-180°C, pressure 1.4-2.0MPa; The steam-exploded stevia leaves are decomposed by replenishing water through a high-consistency mill; 3) The slurry decomposed in step 2) is put into a continuous countercurrent extractor to extract stevioside, and then the stevia leaf residue is squeezed dry with a squeezer When the water content is 50wt%, the extract and leaf residue are obtained; 4) The extract is treated with two-stage ultrafiltration membrane, then desalted and pigmented by ion exchange resin, and finally concentrated to 30wt% by nanofiltration membrane before spraying Dry to obtain the finished steviol glycoside. The method can fundamentally solve the influence of the dense structure of stevia leaf cell wall on the dissolution of active ingredients, and can improve the dissolution efficiency of stevioside extract.

Description

technical field [0001] The invention belongs to the technical field of plant extraction, in particular to a preparation process for extracting stevioside and fermented feed through steam explosion treatment of stevia rebaudiana. Background technique [0002] Stevioside is a low-calorie, high-sweet natural sweetener with a wide range of applications in the market. It is used in beverages, cakes, beer, puffed food, etc. It is the third sweetener with development value besides sugarcane and beet sugar. Stevioside is a mixture extracted from the dry leaves of the Compositae herb Stevia rebaudiana, mainly containing 8 kinds of diterpene glycosides. Stevioside is a natural sweetener that can replace sucrose. Its biggest feature is high sweetness, low calorie, safety and non-toxicity. Its sweetness is similar to xylitol, and it is gradually being favored by sugar Market welcome. [0003] Stevia rebaudiana leaf extract, stevioside, mostly exists in the vacuoles of plant cells. As...

AI Technical Summary

Problems solved by technology

But there are following problems in this technology: 1) when raw material is broken, labor intensity is big, and the dust that produces has influenced environment

2) Chemicals are added to flocculation, which has a certain impact on product quality and yield

3) The macroporous resin adsorption section produces a large amount of impurity-containing eluent, which cannot be reused and seriously pollutes the environment; 4) The purity of the obtained product is not high, generally lower than 85%. According to my country's stevioside quality standard (GB8270 -2014, as shown in Table 1), not up to standard

[0009] The method of the above-mentioned patent is processed before the steam explosion and is specially used for the production of feed, which is not suitable for the extraction and quality assurance of steviol glycosides

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