Prepn. of 1-methyl cyclopropene stable inclusion compound for fresh keeping of fruits and vegetables

Abstract

A stable inclusion compound for the antistaling purpose of fruit, vegetable, flower, plant, etc. is prepared from 1-methyl cyclopropene, starch and alpha-cyclodextrin or its derivative by using of a reaction system, which is composed of 1-methyl cyclopropene generator, three-pass gas washing unit, inclusion reactor and tail gas absorbing unit.

Description

technical field [0001] The invention belongs to the technical field of fresh-keeping, and in particular relates to a preparation method of a 1-methylcyclopropene stable inclusion compound used for fresh-keeping of fruits, vegetables and flowers. technical background [0002] At present, the proportion of fresh-keeping fruits and vegetables in our country is relatively small. Due to poor fresh-keeping treatment, the annual consumption rate of fruits is 20% to 25%, and the annual loss rate of vegetables is as high as 30%. The annual loss of fruits and vegetables is hundreds of millions of tons. . At the same time, with the continuous improvement of the quality of life of the people, the common people hope that they can eat fresh and delicious fruits and vegetables all year round, and decorate their living environment with flowers. Fresh-keeping technologies for fruits, vegetables and flowers have emerged as the times require. Fresh-keeping technology i...

AI Technical Summary

Problems solved by technology

The U.S. patent reports the inclusion of 1-methylcyclopropene using α-cyclodextrin as an inclusion material: for example, the U.S. patent US20020043730 patent is to pass 1-methylcyclopropene gas through a non-stop drenching α-cyclodextrin In the aqueous solution collection device, the gas is absorbed by the α-cyclodextrin aqueous solution poured into the device and produces inclusions, and the suspension after inclusions is filtered and recycled. In this method, the contact between the aqueous solution and the gas In a short time, a large amount of 1-methylcyclopropene gas is discharged without inclusion, and the inclusion efficiency is low, and with the consumption of α-cyclodextrin in the solution, the inclusion efficiency will also decrease significantly

[0006] U.S. Patent US20050261131 is to pass 1-methylcyclopropene gas into a closed pressurized container, add α-cyclodextrin solution prepared from a buffer solution in the container, and equilibrate under pressure for more than 24 hours to obtain inclusion products. The entire inclusion system is complex and the inclusion reaction time is too long, resulting in low production efficiency

[0007] The method mentioned in U.S. Patent No. 6,017,849 also has too long inclusion time, and as the inclusion process proceeds, the partial pressure of 1-methylcyclopropene will decrease as the reaction proceeds, which will lead to a decrease in the inclusion rate. decrease

[0008] At present, there is no relevant literature report on the use of α-cyclodextrin or its derivatives for 1-methylcyclopropene gas inclusion in the production of fruit, vegetable and flower preservatives in China.