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Preparation method of pullulan polysaccharide based rice fresh keeping agent

A pullulan polysaccharide and antistaling agent technology, which is applied to the functions of food ingredients, preservation of seeds with a coating protective layer, food ingredients as antioxidants, etc., can solve problems that affect the safety of consumers' lives and property, and achieve the purpose of prolonging rice production. The effect of storage period, delaying lipid oxidation, and convenient operation

Inactive Publication Date: 2018-07-06
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, some microorganisms, especially molds, tend to grow in rice and decompose the nutrients in rice; at the same time, many intermediate products and even toxins are produced, which seriously affect the safety of consumers' lives and properties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Accurately weigh 80 parts of pullulan with a molecular weight of 100,000Da, 8 parts of ascorbic acid and 12 parts of sorbitol, and dissolve them in pH 6.8 phosphate buffer in turn, so that the concentration of preservative solids is 4wt%, stir for 30min, and Degas under vacuum for 30 minutes to obtain the rice preservative. The antistaling agent was evenly sprayed on the surface of rice grains at a ratio of 1:100, and then packaged after air-drying at 30°C for 2 hours.

[0020] After the rice that has been treated with film preservation is stored at a temperature of 20-35°C and a humidity of 50%-60% for 60 days, the appearance and smell are normal, and the fatty acid content, an important indicator of rice aging, is different from that of the control group without film treatment. (17.16mgKOH / 100g) has reduced by 35.66% (reduced to 11.04mgKOH / 100g) compared to, illustrate that the rice coating agent proposed by this patent can effectively keep the freshness of rice, and ...

Embodiment 2

[0022] Accurately weigh 85 parts of pullulan with a molecular weight of 500,000Da, 5 parts of ascorbic acid and 10 parts of sorbitol, and dissolve them in pH 6.6 phosphate buffer in sequence so that the solid content is 3 wt%, stir for 30 min, and place in a vacuum Under degassing for 30 minutes, the rice preservative is obtained. The antistaling agent was evenly sprayed on the surface of the rice grains through a humidifier in the polishing process at a mass ratio of 1:150, and then dried at 35°C for 30 minutes before packaging.

[0023] After 90 days of storage at a temperature of 30-35°C and a humidity of 50%-60%, the rice that has been treated with coating film preservation has normal appearance and odor, and the fatty acid content, an important indicator of rice aging, is different from that of the control group without coating treatment. (31.29mgKOH / 100g) reduced by 26.46% (reduced to 23.01mgKOH / 100g) compared to, illustrate that the rice coating agent provided by this p...

Embodiment 3

[0025] Accurately weigh 90 parts of pullulan with a molecular weight of 300,000Da, 3 parts of ascorbic acid and 7 parts of glycerol, and dissolve them in pH 6.5 phosphate buffer in sequence to make the solids concentration 5 wt%, stir for 30 min, and place under vacuum After degassing for 20 minutes, the rice preservative is obtained. The antistaling agent was evenly sprayed on the surface of the rice grains through a humidifier in the polishing process at a mass ratio of 1:200, and then packaged after air drying at 40°C for 30 minutes.

[0026] After 90 days of storage at a temperature of 30-35°C and a humidity of 50%-60%, the rice that has been treated with coating film preservation has normal appearance and odor, and the fatty acid content, an important indicator of rice aging, is different from that of the control group without coating treatment. (31.29mgKOH / 100g) has reduced by 37.46% compared to (reduced to 19.57mgKOH / 100g), illustrating that the rice film coating agent ...

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Abstract

The invention relates to a preparation method of a pullulan polysaccharide based rice fresh keeping agent, and belongs to the technical field of fresh keeping of food grains. Pullulan polysaccharide is used as a film forming substrate, oxidation resistance of ascorbic acid is combined, and after two components namely the pullulan polysaccharide and the ascorbic acid are compounded, the pullulan polysaccharide based rice fresh keeping agent is prepared. The rice fresh keeping agent provided by the invention can be uniformly sprayed onto the surfaces of rice grains in the polishing operation procedure of rice processing, is convenient to use, and is easy to popularize and use. The rice fresh keeping agent provided by the invention has the advantages of being natural and safe in components, green and environmental-friendly in preparation technology, controllable in use cost, significant in fresh keeping effects and the like, the problems of ageing, mildew, rot and the like of the rice during storage period can be effectively controlled, the shelf life of the rice is prolonged, the freshness of the rice is reserved, and the rice fresh keeping agent has important practical significanceon solving the problem that the food grains are difficult to store.

Description

technical field [0001] The invention relates to the technical field of grain preservation, in particular to a preparation and application method of a pullulan-based rice preservation agent. Background technique [0002] Rice is rich in nutrients and is one of the staple foods of human beings. However, due to the lack of protection of rice husk and bran, the endosperm of rice grains is directly exposed to the environment, making it extremely vulnerable to fluctuations in the external environment such as oxygen, temperature, and moisture during storage. Lipids and proteins in rice undergo complex changes, which degrades the color, flavor, nutritional value and edible quality of rice, leading to aging. In addition, some microorganisms, especially molds, tend to grow in rice and decompose the nutrients in rice; at the same time, many intermediate products and even toxins are produced, which seriously affect the life and property safety of consumers. Therefore, the storage prob...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A23B9/14A23L7/10A23L33/21
CPCA23B9/14A23L7/10A23L33/21A23V2002/00A23V2200/02A23V2250/708A23V2250/5076A23V2200/30
Inventor 田耀旗陈龙孙冰华麻荣荣金征宇顾子玄
Owner JIANGNAN UNIV
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