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Efficient preparation method of polydextrose

A technology of polydextrose and glucose, applied in the field of efficient preparation of polydextrose, can solve the problems of high cost of polydextrose, uneven heating, and high local reaction temperature, and achieves the advantages of being beneficial to large-scale industrial production, reducing equipment costs, and high-efficiency synthesis. Effect

Active Publication Date: 2021-11-05
XIAN MEDICAL UNIV
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Problems solved by technology

[0004] The traditional preparation method of polydextrose is to carry out polymerization reaction under high temperature and high vacuum degree of melting state. In the traditional method, due to the problem of excessive viscosity of the system and uneven heating during the polymerization process, the local reaction temperature is too high, resulting in Polydextrose with too high molecular weight (molecular weight>22000), and problems such as coking
Because this traditional process needs to carry out polymerization reaction at high temperature and high degree of accuracy for a long time, it has high requirements for equipment and high energy consumption, so the cost of producing polydextrose is relatively high.

Method used

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preparation example Construction

[0031] Such as figure 1 As shown, the efficient preparation method of a kind of polydextrose provided by the invention comprises:

[0032] S1, adding glucose, sorbitol, and organic phosphoric acid to the flask in sequence according to their respective preset equivalents;

[0033] Wherein, in this step, glucose, sorbitol and organic phosphoric acid can be sequentially added to the flask according to the equivalent of glucose being 1.0eq and the equivalent of sorbitol being 0.11eq.

[0034] Wherein, the organic phosphoric acid is the catalyst of the reaction system, and the organic phosphoric acid is polyphosphoric acid. The reaction system can obtain a uniform mechanical stirring property at 50° C., so that the reaction system can fully react.

[0035] S2, inserting a mechanical stirrer into the reaction system of the flask, raising the temperature of the reaction system to 50° C. and stirring for 36 hours;

[0036] S3, cooling the reaction system to room temperature;

[00...

Embodiment 1

[0054]Glucose (5g, 27.8mmol, 1.0eq), sorbitol (565mg, 3.1mmol, 0.11eq), polyphosphoric acid (10ml) was added in the flask of 50mL successively, inserted mechanical stirrer in the reaction flask, the reaction temperature was raised Stir at 50°C for 36 hours. After the reaction is complete, cool the reaction to room temperature, slowly add deionized water (10 mL) dropwise to the reaction, stir for 30 minutes, add saturated aqueous sodium bicarbonate to adjust the pH value to 6, The water in the reaction system was removed to obtain polydextrose, and the product was dried in a vacuum oven with a yield of 94.9%.

Embodiment 2

[0056] refer to figure 2 , figure 2 For the molecular diagram of the polydextrose prepared by the preparation method of the present invention, the product quality index of the present invention reaches the requirement of FCC (IV) (1997), wherein several important indexes are better than this standard, see Table 1.

[0057] Table 1 FCC (1V) (1997) standard and product quality index comparison table

[0058] project standard value Measured value (average value of 10 batches of products) molecular weight ≤22000 ≤22000 content ≥90％ 90.1％ 1,6-Anhydroglucose ≤4.0％ 1.1％ Glucose + Sorbitol ≤6.0％ 2.0％ moisture ≤4.0％ 0.4％ Ash ≤0.3％ 0.13％ 5-Hydroxymethylfurfural ≤0.1％ 0.02％

[0059] In summary, the polyphosphoric acid of the present invention is used as a catalyst to simplify the synthesis process of polydextrose, and to synthesize and prepare polydextrose with low energy consumption, so as to obtain high yield and hig...

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Abstract

The invention provides an efficient preparation method of polydextrose. The method comprises the following steps: sequentially adding glucose, sorbitol and organic phosphoric acid into a flask according to respective preset equivalents; inserting a mechanical stirrer into a reaction system of the flask, heating the reaction system to 50 DEG C, and conducting stirring for 36 hours; cooling the reaction system to room temperature; adding water into the reaction system, conducting stirring, and adding a certain amount of alkali into the stirred reaction system to neutralize the hydrolyzed small molecular phosphoric acid in the reaction system so as to adjust the pH value; and removing moisture in the reaction system and conducting drying to obtain the polydextrose. Compared with a traditional synthesis method with the synthesis temperature being 200 DEG C or above, the method only needs one normal-pressure reactor, and high-efficiency synthesis of polydextrose can be achieved at the low temperature. In the whole process, the equipment cost can be effectively reduced, the requirement for energy in the production process can be effectively reduced, and large-scale industrial production of polydextrose is facilitated.

Description

technical field [0001] The invention belongs to the technical field of polydextrose preparation, and in particular relates to a high-efficiency preparation method of polydextrose. Background technique [0002] Polydextrose is a new type of water-soluble dietary fiber. It is used as a healthy food ingredient and is widely used in the manufacture of fiber-enhanced foods. After eating, it has the function of keeping the stomach smooth. In addition to the effects of insoluble dietary fiber on significantly increasing stool volume, enhancing defecation, and reducing the risk of intestinal cancer, polydextrose also has insoluble dietary fiber. Acid, significantly lower serum cholesterol, more likely to cause satiety, can significantly reduce blood sugar levels after meals, etc. The use of polydextrose in food can replace part of sugar and fat, which can improve the texture and taste of food; the taste is refreshing, and the aroma of food is easy to release; a good source of dieta...

Claims

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Application Information

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IPC IPC(8): C08B37/02
CPCC08B37/0009
Inventor 张小庆
Owner XIAN MEDICAL UNIV