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Preparation of beta-cyclodextrin sustained-release microcapsule of forestry insect repellant (E)-2-hexenal and determination method

A technology for slow-release microcapsules and pest repellents, which is applied in the field of preparation of beta-cyclodextrin slow-release microcapsules, and can solve the problems of large-scale artificial application limitation, easy oxidation and deterioration, and the inability to achieve quantitative control of release amount. , to achieve the effect of convenient transportation and use, mild reaction conditions, and controlled release concentration

Inactive Publication Date: 2012-09-12
SOUTHWEST FORESTRY UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the strong volatility of (E)-2-hexenal, quantitative control of the release amount cannot be realized at present; at the same time, due to the active chemical properties of (E)-2-hexenal, it is easily oxidized when exposed to air go bad
These characteristics have greatly restricted the large-scale artificial application of (E)-2-hexenal in the wild and in the forest.

Method used

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  • Preparation of beta-cyclodextrin sustained-release microcapsule of forestry insect repellant (E)-2-hexenal and determination method
  • Preparation of beta-cyclodextrin sustained-release microcapsule of forestry insect repellant (E)-2-hexenal and determination method
  • Preparation of beta-cyclodextrin sustained-release microcapsule of forestry insect repellant (E)-2-hexenal and determination method

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Embodiment Construction

[0045] (1) Preparation method of β-cyclodextrin sustained-release microcapsules of (E)-2-hexenal

[0046] Use a graduated cylinder to measure 100 ml volume ratio V 乙醇 :V 水 = 1:2 mixed solution of ethanol and water, the ethanol concentration of the mixed solution is 33.3%, placed in a 250 ml three-necked round bottom flask, then weighed 5.0 g β-cyclodextrin (4.4 mmol), and stirred rapidly Add it into a round-bottomed flask, raise the temperature to 35°C and continue to stir at 35°C for 5 minutes to fully dissolve the β-cyclodextrin; draw 0.8 ml (E)-2-hexenal (6.9 m mol), slowly added dropwise to the round bottom flask, and kept stirring rapidly during the dropwise addition, and continued to stir for 3 hours after the dropwise addition was completed. Heat up to 35°C. After the reaction, cool the solution at room temperature to slowly precipitate the microcapsule crystals. After 24 hours, filter under reduced pressure and wash the crystals with 3ml of water for 3 times each...

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Abstract

A preparation of beta-cyclodextrin sustained-release microcapsule of a forestry insect repellant (E)-2-hexenal and a determination method relate to the forestry insect disease control and medicament sustained-release field. According to the preparation method provided by the invention, beta-cyclodextrin is used as a wall material for clathration of the insect repellant (E)-2-hexenal so as to obtain the beta-cyclodextrin microcapsule with a sustained-release effect. Air at a constant rate is continuously blown in for 30 days, and the release amount of (E)-2-hexenal during 24 hours is quantificationally measured by UV spectrophotometry. Results show that the beta-cyclodextrin microcapsule prepared by the method has a good release effect and can be used to control insects in the forestry field.

Description

technical field [0001] The invention relates to the field of forestry pest control and drug slow release, in particular to a preparation method of β-cyclodextrin slow release microcapsules of pest repellent. Background technique [0002] In the relationship between plants and herbivorous insects, plant odor plays an important role in their feeding and oviposition positioning. The use of plant volatile odor characteristics to attract or repel insects to control insect populations is a bright spot in the current research on integrated pest management. (E)-2-hexenal, also known as trans-2-hexenal, green leaf aldehyde, is a volatile substance synthesized by green plant leaves. In terms of biology, (E)-2-hexenal is a semiotic substance for many insects, which is attractive to some species of insects and repellent to others. [0003] 1. (E)-2-Hexenal as a volatile component of host plants [0004] Some researchers found that the green ligud bug showed a strong EAG response to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N25/10A01N25/22A01N35/02A01P17/00B01J13/02G01N21/33
Inventor 王大伟杨斌赵宁
Owner SOUTHWEST FORESTRY UNIVERSITY
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