Preparation method and application of natural oil- and starch-esterified starch ester

Abstract

The invention discloses a preparation method and application of natural oil- and starch-esterified starch ester and belongs to the technical field of modified starch. In the preparation method, starch is taken as a raw material and the natural oil is taken as an esterifying agent; and the starch is subjected to acidolysis and esterification modification by a dry-method process combining microwave and high temperature heating so as to prepare low-degree of substitution natural oil- and starch-esterified starch ester products. Due to the introduction of a hydrophobic organic carbon chain, the starch has oleophylic and hydrophilic amphiphilic properties; therefore, the starch has certain emulsifying property. The product starch ester can be used as a stabilizing agent, an emulsifying agent, a gel, a fat substitute, a microcapsule wall material and the like in the food industry, and can be applied to margarine, salad dressing, bakery products, dairy products, frozen food and the like. The invention has the advantages that: the esterified starch is prepared by the dry-method process combining the microwave and the high temperature heating, the reaction process is simple, the method is easy to implement, the environmental pollution is light, the processing time is short, and the product performance is excellent.

Description

technical field [0001] The invention discloses a preparation method and application of a starch ester obtained by esterifying natural oil and starch, and belongs to the technical field of modified starch. Background technique [0002] The principle of producing starch ester of natural oil and starch esterification by microwave plus dry method is explained as follows: under the action of microwave, natural oil will be hydrolyzed, and the content of free fatty acid will increase. The direct Fischer esterification reaction occurs under the catalytic action of the catalyst. In this reaction, the acid is not only a catalyst for the esterification reaction, but also degrades the starch, resulting in the shortening of the starch molecular chain, the destruction of the branch structure of the amylopectin, the reduction of the reaction space barrier, and the increase of the esterification reaction opportunities between fatty acids and starch. [0003] In foreign countries, there are...

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Problems solved by technology

At present, the domestic wet process mainly includes starch stearate produced by Cheng Fa and others using the water-medium method. The main disadvantage of this process is that it produces a large amount of waste water and pollutes the environment; the dry process has the high temperature used by Xu Aiguo. The main disadvantage of this process is that it consumes a lot of heat energy and takes a long time to react; there is also the microwave method used by Shi Qiaoling. This method is not very uniform in mixing the esterification agent and starch, and long-term microwave treatment is likely to cause local reactions and affect the product. quality; there is also the extrusion method adopted by Liu Fengru et al.; the degrees of substitution obtained by the above methods are all low, and the reaction efficiency is not high

[0004] Microwave treatment technology is a new technology applied in the production of modified starch, but it is quickly paid attention to because of its short treatment time and remarkable treatment effect, but long-term microwave treatment is likely to cause uneven heating and affect product quality

High-temperature heating technology is an important technology applied in the production of modified starch, but it consumes a lot of heat energy because it takes too long (4h)

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