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Litsea cubeba oil microcapsule and preparation method thereof

A technology of litsea cubeba oil and microcapsules, which is applied in botany equipment and methods, edible seed preservation, chemicals for biological control, etc., can solve problems such as unsatisfactory use effects, and achieve good insect control performance and convenient use , effective use for a long time

Inactive Publication Date: 2014-02-05
JIAYING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using ethyl cellulose, highly substituted hydroxypropyl cellulose, acacia gum and maltodextrin as composite wall materials to prepare litsea grass Litsea cubeba oil microcapsules have obtained a solid product with good natural slow-release properties, which are used for mildew-proof and moth-proof effects, and have similar effects with the product of the present invention, but this litsea cubeba oil anti-mildew and moth-proof slow-release microcapsules are effective. The oil load is only about 22%, and the use effect is not ideal

Method used

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  • Litsea cubeba oil microcapsule and preparation method thereof
  • Litsea cubeba oil microcapsule and preparation method thereof
  • Litsea cubeba oil microcapsule and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Take 2g of sodium alginate, add 65mL of water, stir, heat to 55°C, keep constant temperature, and make it into a uniform viscous liquid; then add 6g of litsea cubeba oil, stir evenly; finally account for 1% of the total amount of emulsion A The aqueous solution containing 2% Tween-80 was stirred thoroughly to obtain emulsion A, which was set aside.

[0032] Another 1.6g of chitosan and 8g of anhydrous calcium chloride were added to 150mL of water to make a solution, and the pH was adjusted to 5.5 with acetic acid to obtain coagulation bath B for use.

[0033]Drop the emulsion A into the coagulation bath B with a needle to obtain milky white microcapsules, store them sealed for 30 minutes, filter, collect the microspheres, dry in an oven at 50°C for 1 hour, wash with 5mL of petroleum ether, and obtain yellow granular products . The embedding rate of essential oil is 95.1%, and the oil content of microcapsules is 57.9%.

Embodiment 2

[0035] Take 2g of sodium alginate, add 98mL of water, stir, heat to 55°C, keep constant temperature, and make it into a uniform viscous liquid; then add 8g of litsea cubeba oil, stir evenly; finally account for 0.8% of the total amount of emulsion A The aqueous solution containing 1% Tween-80 was stirred thoroughly to obtain emulsion A, which was set aside.

[0036] Take another 6.2g chitosan and 3.8g anhydrous calcium chloride, add 185mL water to make a solution, adjust the pH to 5 with acetic acid, and obtain the coagulation bath B for use.

[0037] Drop emulsion A into solution B with a needle to obtain milky white microcapsules, store them sealed for 40 minutes, filter, collect the microspheres, dry in an oven at 50°C for 2 hours, wash with 8 mL of petroleum ether, and obtain yellow granular products. The embedding rate of essential oil is 85.7%, and the oil content of microcapsules is 42.5%.

Embodiment 3

[0039] Take 3g of sodium alginate, add 97mL of water, stir, heat to 60°C, keep the temperature constant, and make it into a uniform viscous liquid; then add 9g of litsea cubeba oil, stir evenly; finally account for 1% of the total amount of emulsion A The aqueous solution containing 2% Tween-80 was stirred thoroughly to obtain emulsion A, which was set aside.

[0040] Another 3.2g of chitosan and 4.8g of anhydrous calcium chloride were added to 152mL of water to form a solution, and the pH was adjusted to 6 with 1mol / L sodium hydroxide solution to obtain coagulation bath B for use.

[0041] Drop emulsion A into solution B with a needle to obtain milky white microcapsules, store them sealed for 50 minutes, filter, collect the microspheres, dry in an oven at 50°C for 2 hours, wash with 10 mL of petroleum ether, and obtain yellow granular products. The embedding rate of essential oil is 91.4%, and the oil content of microcapsules is 51.2%.

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Abstract

The invention discloses a litsea cubeba oil microcapsule and a preparation method thereof, and belongs to the technical field of mouldproof and insecticidal capsules. The litsea cubeba oil microcapsule is characterized by being prepared by the complex coacervation of litsea cubeba oil taken as a core material, sodium alginate taken as a main wall material and an aqueous solution which contains 1% to 5% of chitosan and 2% to 5% of anhydrous calcium chloride and is taken as a coagulating bath solution, wherein the mass ratio of the sodium alginate to the litsea cubeba oil is 1:(1-4). The preparation method mainly comprises the following steps: firstly preparing an emulsion A of the sodium alginate and the litsea cubeba oil; then preparing the aqueous solution of the chitosan and the anhydrous calcium chloride as the coagulating bath solution B; dripping the emulsion A into the coagulating bath solution B; and solidifying the mixture for certain time and then filtering the mixture, thereby obtaining the litsea cubeba oil microcapsule. Thus, the litsea cubeba oil microcapsule which is high in litsea cubeba oil content, long in service time and good in mouldproof and insecticidal effect and the preparation method of the litsea cubeba oil microcapsule are provided. The litsea cubeba oil microcapsule is mainly used for performing mouldproof and insecticidal functions on grains as well as on clothes.

Description

technical field [0001] The present invention relates to a kind of microcapsule used for mildew prevention and insecticide, more specifically, relates to a kind of litsea cubeba oil microcapsule. The invention also relates to a preparation method of the litsea cubeba oil microcapsule. Background technique [0002] Litsea cubeba oil is a natural plant essential oil obtained by steam distillation of litsea cubeba fruit, bark and leaves. It has a strong lemon fragrance, and its main component is citral, and its content is generally 60% to 80%. Litsea cubeba oil has strong bactericidal and anti-insect activities. It has a very good inhibitory or killing effect on more than ten kinds of pathogenic bacteria such as Staphylococcus aureus, Neisseria gonorrhoeae, Escherichia coli and many molds such as Candida, trichophyton, Aspergillus niger, Aspergillus flavus and Aspergillus fumigatus , is known to be one of the plant natural products with the broadest antibacterial spectrum and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A23B9/26A01N65/24A01N25/28A01P1/00A01P3/00A01P7/04A01P17/00
Inventor 彭梦侠
Owner JIAYING UNIV
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