Preparing method for modified starch with function of efficiently adsorbing and controllably releasing ethylene

A starch and modification technology, applied in the chemical and food fields, can solve the problems of poor storage stability, complex adsorption process, low ethylene adsorption rate, etc., and achieve the effects of easy storage and transportation, prolonged release time, and high crystallinity.

Active Publication Date: 2019-07-30
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cyclodextrin used in this method is expensive, the adsorption process is complicated, the sample recovery rate and ethylene adsorption rate are low, and the storage stability is not good, so it is not suitable for large-scale food industry production.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (1) Preparation of V-type crystalline starch

[0042] a) Sizing: adjust high amylose corn starch (Hylon-VII) with ethanol aqueous solution (40%, w / w) to prepare starch slurry with a dry starch mass fraction of 12%.

[0043] b) Reaction: Keep the starch slurry in step a) at a constant temperature in a water bath to 30° C., add 3 mol / L NaOH solution dropwise at a rate of 4 g / min, and stir for 20 min. The mass ratio of starch to NaOH solution is 1:8.

[0044] c) neutralization: the starch slurry obtained in step b) was centrifuged at 1811 × g, washed twice with ethanol aqueous solution (40%, w / w), neutralized with 3mol / L hydrochloric acid ethanol solution, centrifuged, Wash once with aqueous ethanol (95%, w / w) and once with absolute ethanol. The obtained starch was dried in an oven at 80° C. for 3 hours, then dried in an oven at 45° C. for 12 hours, and passed through a 150-mesh sieve to obtain V-type crystalline starch.

[0045] d) toughening: put the starch obtained i...

Embodiment 2

[0051] (1) Preparation of V-type crystalline starch

[0052] a) Sizing: adjust the high amylose corn starch (Hylon-V) starch with aqueous ethanol (40%, w / w) to prepare a starch slurry with a dry starch mass fraction of 12%.

[0053] b) Reaction: keep the starch slurry in step a) at a constant temperature in a water bath to 25° C., dropwise add 3 mol / L NaOH solution at a rate of 4 g / min, and stir for 30 min. The mass ratio of starch to NaOH solution is 1:5.

[0054] c) neutralization: the starch slurry obtained in step b) was centrifuged at 1811 × g, washed twice with ethanol aqueous solution (40%, w / w), neutralized with 3mol / L hydrochloric acid ethanol solution, centrifuged, Wash once with aqueous ethanol (95%, w / w) and once with absolute ethanol. The obtained starch was dried in an oven at 80° C. for 3 hours, then dried in an oven at 45° C. for 12 hours, and passed through a 150-mesh sieve to obtain V-type crystalline starch.

[0055] d) Toughening: put the starch obtained...

Embodiment 3

[0060] (1) Preparation of V-type crystalline starch

[0061] a) Sizing: adjust high amylose corn starch (Hylon-VII) with ethanol aqueous solution (40%, w / w) to prepare starch slurry with a dry starch mass fraction of 12%.

[0062] b) Reaction: Keep the starch slurry in step a) at a constant temperature in a water bath to 35° C., add 3 mol / L NaOH solution dropwise at a rate of 4 g / min, and stir for 30 min. The mass ratio of starch to NaOH solution is 1:8.

[0063] c) neutralization: the starch slurry obtained in step b) was centrifuged at 1811 × g, washed twice with ethanol aqueous solution (40%, w / w), neutralized with 3mol / L hydrochloric acid ethanol solution, centrifuged, Wash once with aqueous ethanol (95%, w / w) and once with absolute ethanol. The obtained starch was dried in an oven at 80° C. for 3 hours, then dried in an oven at 45° C. for 24 hours, and passed through a 150-mesh sieve to obtain V-type crystalline starch.

[0064] d) Toughening: Put the starch obtained i...

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Abstract

The invention discloses a preparing method for modified starch with a function of efficiently adsorbing and controllably releasing ethylene. The preparing method includes the steps that starch is blended into starch paste liquid with an ethyl alcohol aqueous solution, a NaOH solution is dropwise added, and the mixture reacts for 10 min to 120 min under the condition of 25 DEG C to 50 DEG C; centrifuging is conducted, neutralization is conducted with a hydrochloric-acid ethyl alcohol solution, and washing and drying are conducted; the dried starch is put into a 45-100% ethyl alcohol aqueous solution and put into a water bath of 30 DEG C to 70 DEG C for heating, washing and drying are conducted, and then the modified starch is obtained. Through testing, the content of ethylene in an ethylenecompound prepared with the modified starch is 49.6%(w/w), and the ethylene can be continuously released for 200 hours at the temperature of 4 DEG C, and can be continuously released for 100 hours atthe temperature of 25 DEG C. According to the preparing method, the starch modification and ethylene adsorption technology is simple, efficient and low in cost, and the product has broad application prospects in the field of air conditioning and fresh keeping of fruits and vegetables.

Description

technical field [0001] The invention relates to a method for preparing modified starch with high-efficiency adsorption and controlled release of ethylene, in particular to a method for improving the ethylene embedding rate and slow-release effect in the compound. The method involves the embedding of ethylene gas and belongs to food , Chemical field. Background technique [0002] Ethylene is an important gas that regulates plant maturation. Known as "phytohormone", it can promote fruit ripening, induce adventitious roots and root hairs, and break the dormancy of plant seeds and buds. In the field of fruit and vegetable preservation, ethephon, which is widely used at present, can induce plants or fruits to release ethylene, but it has certain toxicity, and its safety has attracted much attention. [0003] Gas is usually stored and transported in high-pressure steel cylinders, but there are risks of leakage and explosion during use. Adsorbing the gas in the solid medium can e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/30C08B30/20
CPCB01J20/24C08B30/20
Inventor 黄强石林凡张斌扶雄李超
Owner SOUTH CHINA UNIV OF TECH
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