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Use of willow leaf wintersweet extract in preparation of mosquito repelling agent

The technology of a mosquito repellent and an extract is applied in the field of preparing a mosquito repellent from the extract of S. chinensis, which can solve the problems of no mosquito repellent report and the like, and achieve the effect of wide application prospect.

Inactive Publication Date: 2011-10-19
ZHEJIANG FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

He Jianyun and others published "Analysis of volatile oil components in herbal tea" in "Chemistry and Life Engineering" Volume 27, Issue 4, in which they studied the components of willow leaves and wintersweet, but there was no report on mosquito repellent

Method used

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  • Use of willow leaf wintersweet extract in preparation of mosquito repelling agent

Examples

Experimental program
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Effect test

Embodiment 1

[0025] 1) Take 2000g of willow-leaved wintersweet leaves, crush them, and pass through a 50-mesh sieve. Place them in supercritical extraction equipment respectively, extract, and depressurize and separate to obtain 20mL willow leaf wintersweet essential oil altogether; Described supercritical extraction equipment adopts double separation kettle, and extraction pressure is 21.1MPa, and extraction temperature is 54.5 ℃, and extraction time is 1.31 h; the pressure of the separation tank I was set to 6.0MPa, and the temperature was set to 40°C; the pressure of the separation tank II was set to 6.0MPa, and the temperature was set to 40°C; 2 The flow rate is 20L / h.

[0026] 2) Using the saturated aqueous solution method, the ratio of willow leaf essential oil to β-CD (β-cyclodextrin) is 1:8mL / g, the inclusion temperature is 45°C, the stirring time is 2h, the ratio of β-CD to water 1: 10g / mL, prepared the clathrate of the essential oil of the willow leaf plum, poured it into the aq...

Embodiment 2

[0033] 1) Take 2000g of willow-leaved wintersweet leaves, adopt steam distillation method to obtain willow-leaved wintersweet essential oil 10mL, add ethanol 90ml, make oily solution;

[0034] 2) Weigh an appropriate amount of β-cyclodextrin (dried at 50°C for 1.5 h) and put it into a conical flask, then add an appropriate amount of distilled water, heat to dissolve, and make a saturated aqueous solution. After cooling, put it on a magnetic stirrer, slowly add the oily solution at a certain temperature, stir and clathrate for a certain period of time, let stand, refrigerate for 24 hours and filter. Wash with 100mL of 95% ethanol, filter, dry in the air, and dry in a vacuum oven at 40°C for 2 hours to obtain the clathrate;

[0035] 3) Take commercially available polysaccharides of Bletilla striata and wintersweet essential oil clathrate, and prepare a suspension of wintersweet by weight as follows:

[0036] 50g of β-cyclodextrin inclusion compound of willow-leaved wintersweet ...

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Abstract

The invention relates to an application of a willow leaf wintersweet extract in the preparation of a mosquito repelling agent. Preferentially, the mosquito repelling agent is prepared by the following steps: taking willow leaf wintersweet leaf blades, pulverizing through a pulverizer, screening, extracting and separating for obtaining willow leaf wintersweet essential oil. The mosquito repelling agent integrates three effects, namely repelling mosquitoes, keeping moisture and protecting health, into a whole, thereby having very wide application prospect.

Description

technical field [0001] The invention relates to the application of the extract of willow leaf and wintersweet to prepare mosquito repellent. Background technique [0002] Willow wintersweet is a semi-evergreen shrub, with papery or thin leathery leaves, ovate-lanceolate to oval-lanceolate, apex acuminate, base cuneate; leaf surface yellow-green, underside powder-green, petioles and leaves with Rough hairs: yellowish-white flowers, born in leaf axils, aggregated achenes in pot-shaped receptacle, flowering period from December to January, fruiting period from May to July of the next year, often stored on branches. [0003] According to reports, the effects of willow-leaved wintersweet are: relieving summer heat and promoting body fluid, appetizing and dispelling stagnation, clearing milk and moistening dryness, and relieving cough. Indications for dizziness, vomiting, qi depression, stomach distress, measles, whooping cough, scalds, fires, otitis media, etc. due to summer hea...

Claims

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Application Information

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IPC IPC(8): A61K8/97A61K8/73A61Q17/02
Inventor 田薇方程吉
Owner ZHEJIANG FORESTRY UNIVERSITY
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