Method for ultrasonically crystallizing rebaudiosideA

Abstract

The invention discloses a method for ultrasonically crystallizing rebaudiosideA, which comprises the following steps of: charging stevioside and dissolvent according to the quality volume ratio (kg:L) of 1:4-10; stirring, charging and heating to be the temperature of 40-80 DEG C; constantly keeping the temperature at 30-90 minutes; fast reducing the temperature to be 10-25 DEG C with the velocity of 5-15 DEG C per minute; sequentially statically crystallizing and recrystallizing for 3-12 hours, wherein the ultrasonic wave is adopted to perform auxiliary crystallizing and recrystallizing during statically putting; stirring and performing the ultrasonic wave for 5-15 minutes every 30-90 minutes; and performing solid-liquid separation, dissolution in a washing way, membrane separation, reduced pressure distillation and spray drying to the recrystallized crystalloid to obtain the high-purity rebaudiosideA. The method has the crystallizing time of only 6-24 hours, the rebaudiosideA yield which is more than 75%, even crystallizing grains, and the rebaudiosideA purity which reaches up to be more than 95%, meets the standards of American FDA, can be produced on a large scale, and has obvious effect.

Description

A method for ultrasonic crystallization of rebaudioside A technical field The invention relates to a method for separating rebaudioside A from stevioside, in particular to a method for ultrasonically crystallizing rebaudioside A. technical background Stevioside, also known as steviol glycoside, commonly known as stevioside, is a kind of pure natural, high sweetness, low calorie value, edible safety food additive extracted from the leaves of stevia rebaudiana. The third natural sugar source after beet sugar, its sweetness is 200-350 times that of sucrose, but its calories are only 1 / 300 of sucrose. Stevioside is resistant to acid and alkali, good thermal stability, non-fermentative, can be kept in the solution of pH 3-9 for a long time, and does not decompose at up to 200°C, and can be widely used in food, beverage, wine making, medicine, flavor Spices, etc. are used in almost all sugar fields. Stevioside has low calorific value and is safe to eat. It has a certain auxili...

AI Technical Summary

Problems solved by technology

This method is relatively simple, and key technical indicators such as crystallization resting time and rebaudioside A yield are not disclosed, so it is difficult to repeat the method