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Fruit and vegetable preservative and preparation method and application thereof

The technology of a fruit and vegetable preservative and attapulgite clay is applied in the field of fruit and vegetable preservative and its preparation, which can solve the problems of structure collapse in contact with water and reduced adsorption performance, so as to slow down the decay progress, reduce the ethylene content, and delay the climacteric time. Effect

Inactive Publication Date: 2018-11-02
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with traditional adsorption materials, metal-organic framework compounds with periodic network structure have unique advantages such as ultra-high porosity and large specific surface area, rich topology, special metal centers, and adjustable and tailorable properties. It shows excellent performance in the adsorption of low-carbon hydrocarbon components, but it also has the disadvantage of structure collapse when it encounters water, which will lead to a sharp decrease in adsorption performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Attapulgite clay was purified and crystal beam dispersed by conventional methods of purification, acid activation, and homogenization, and it was ready for use.

[0023] Measure 94.7 mL of N,N-dimethylformamide (DMF) into a 250 mL flat-bottomed single-necked flask, and add 2.0 g of Al (NO 3 ) 3 9H 2 O. 1.0 g of 2,5-dihydroxyterephthalic acid (DHTA) and 7.0 g of attapulgite clay, stir and disperse for 10 minutes after feeding, seal the bottle mouth with tin foil and place in a constant temperature oven at 120°C for 18 hours to react. After the reaction, cool down to room temperature naturally, pour off the supernatant, wash the product with N, N-dimethylformamide, ethanol, and distilled water in sequence, and then dry it at 120°C for 4 h. The obtained solid powder is a preservative. Test its The specific surface area is 850 m 2 / g, the pore volume is 0.50 cm 3 / g at 293 K, 105 Pa, the adsorption capacity of ethylene is 5.3 mol / kg, and the adsorption capacity of hydro...

Embodiment 2

[0026] Purify and disperse the attapulgite clay according to the method described in Example 1 for later use.

[0027] Measure 94.7 mL of N,N-dimethylformamide (DMF) into a 250 mL flat-bottomed single-necked flask, and add 2.6 g of Al (NO 3 ) 3 9H 2 O. 1.4 grams of 2,5-dihydroxyterephthalic acid (DHTA) and 6.0 grams of attapulgite clay were dispersed ultrasonically for 20 minutes after feeding, sealed with tin foil and placed in a constant temperature oven at 140°C for 20 hours. After the reaction, cool down to room temperature naturally, pour off the supernatant, wash the product with N, N-dimethylformamide, ethanol, and distilled water in turn, and then dry it at 120°C for 4 hours. The obtained solid powder is a preservative. Test its The specific surface area is 1060 m 2 / g, the pore volume is 0.46 cm 3 / g at 293 K, 105 Pa, the adsorption capacity of ethylene is 5.7 mol / kg, and the adsorption capacity of hydrogen sulfide is 2.5 mol / kg.

[0028] According to the method ...

Embodiment 3

[0030] Purify and disperse the attapulgite clay according to the method described in Example 1 for later use.

[0031] Measure 94.7 mL of N,N-dimethylformamide (DMF) into a 250 mL flat-bottomed single-necked flask, and add 3.9 g of Al (NO 3 ) 3 9H 2 O. 2.1 grams of 2,5-dihydroxyterephthalic acid (DHTA) and 4.0 grams of attapulgite clay were dispersed ultrasonically for 20 minutes after feeding, sealed with tin foil and placed in a constant temperature oven at 100°C for 24 hours. After the reaction, cool down to room temperature naturally, pour off the supernatant, wash the product with N,N-dimethylformamide, ethanol, and distilled water in turn, and then dry it at 120°C for 3 h. The obtained solid powder is a preservative. Test its The specific surface area is 1180 m 2 / g, the pore volume is 0.41 cm 3 / g at 293 K, 105 Pa, the adsorption capacity of ethylene is 5.1 mol / kg, and the adsorption capacity of hydrogen sulfide is 2.0 mol / kg.

[0032] According to the method descr...

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Abstract

The invention discloses a fruit and vegetable preservative. The fruit and vegetable preservative is an attapulgite@metal-organic frame composite material (ATP@MOF for short); and the metal-organic frame is hydroxylated Al2(OH)2(C8O6H4). The invention also discloses a preparation method and application of the fruit and vegetable preservative. The preservative disclosed by the invention can remove ethylene gas capable of inducing aging of fruits and vegetables and hydrogen sulfide gas released by mechanical injury wounds from storing and transporting environments, and also has bacteriostatic andinactivating effects.

Description

technical field [0001] The invention belongs to the technical field of post-processing of horticultural products, and relates to a fruit and vegetable fresh-keeping agent and a preparation method and application thereof. Background technique [0002] China is a large agricultural country, and the fruit and vegetable market is becoming more and more prosperous, and the fruit and vegetable industry is also gradually growing. However, due to the lack of fresh-keeping measures and low-level fresh-keeping technology in our country, the post-harvest loss of fruits reaches 25% to 30%, and that of vegetables is as high as 30%~ 40%, more than 100 million tons of fruits and vegetables rot every year, and the economic loss reaches 100 billion yuan. my country's fruit and vegetable industry urgently needs the escort of the fresh-keeping industry. [0003] Controlling the ethylene content and sterilization in the storage environment of fruits and vegetables are commonly used fresh-keeping...

Claims

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Application Information

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IPC IPC(8): A23B7/154
CPCA23B7/154
Inventor 王健康王丽红陈晓明李静
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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