Preparation method of fructose syrup

Abstract

The invention provides a preparation method of fructose syrup. The preparation method comprises the following steps: adding magnesium sulfate and sodium metabisulfite into glucose liquid with the content of glucose being more than 93%, regulating the pH value of the mixture to 7.0-8.5, heating the mixture to 60-80 DEG C and adding liquid glucose isomerase into the mixture; performing a thermal reaction for 10-30h after uniform mixing, so as to obtain rough fructose syrup; then, regulating the pH value to below 4.0, performing decoloration and removing impurities, so as to obtain the fructose syrup. Compared with the prior art, the method is simple in production process and less in investment on production equipment; in addition, equipment such as an isomerism column, chromatographic separation equipment and the like are not needed, so that the method is convenient in operation, high in flexibility of production scheduling and relatively low in energy consumption, therefore, the methodis beneficial for environmental protection.

Description

technical field [0001] The invention relates to the technical field of food additives, in particular to a preparation method of fructose syrup. Background technique [0002] Fructose is a left-handed six-carbon sugar, which is an isomer of glucose. It has high sweetness and good taste, but generally only exists in natural plants such as fruits and vegetables and honey, and the output is small, so it is difficult to meet the needs of the public. Since the beginning of the 20th century, with the continuous progress of enzyme engineering, solid immobilized glucose isomerase has appeared and been gradually promoted, making it possible to industrialize the production of fructose syrup from glucose syrup. [0003] Fructose syrup is an important sweetener, which is mainly composed of fructose and glucose. Fructose syrup includes F42, F55 and F90 fructose syrup and other products. Among them, "F" means fructose, and the following numbers indicate the percentage of fructose in dry...

AI Technical Summary

Problems solved by technology

The cost of filling the imported immobilized isomerase into the heterogeneous column also needs hundreds of thousands to millions, and the filled heterogeneous column must be used as soon as possible, otherwise the long-term suspension of use will lead to the storage failure of the immobilized isomerase and increase equipment cost

Moreover, the operation cost of heterogeneous columns and chromatographic equipment is high, and the maintenance is cumbersome

For example, chromatographic separation equipment needs to consume a large amount of acid and alkali for cleaning and regeneration, and these acids and alkalis are discharged into the environment, causing pollution

[0007] (2) The operation is complex and the energy consumption of water and electricity is high

[0008] (3) Due to the numerous steps, and the F55 type fructose syrup needs to be obtained by mixing the syrup with a fructose content of 92% and the syrup with a fructose content of 42% in proportion, resulting in large loss of sugar solution and serious waste, which affects production efficiency

And the lost sugar solution is discharged into the wastewater, which leads to an increase in the COD of the wastewater and increases the difficulty of sewage treatment.

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