Preparation method of thunder godvine extract

An extract and a technology of tripterygium wilfordii, which is applied in the field of preparation of an important component tripterygium wilfordii extract, can solve the problems of high production cost, cumbersome process, complicated operation, etc. Effect

Inactive Publication Date: 2005-08-24
ZHEJIANG MEDICINE CO LTD XINCHANG PHAMACEUTICAL FACTORY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Three invention patent applications disclosed above all have following deficiencies: (1) the preparation of existing Tripterygium wilfordii extract all uses root bark and does not use leaf, and the Tripterygium wilfordii extractum of preparation treatment rheumatoid arthritis has produced Conflicts on raw materials, and the content of active ingredients in the obtained Tripterygium wilfordii extract is less; (2) the process is cumbersome, the operation is more complicated, the yield is low, and the production cost is high; (3) it must be used in combination with chemical pesticides, and there is no real Reflect the value of biological pesticides
During this period, in order to reduce nutrient consumption, the leaves of Tripterygium wisteria must be pruned every summer and autumn, and the leaves will be defoliated in winter, but these leaves are not fully utilized, resulting in a great waste of materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: Weigh 30g of Tripterygium wilfordii broken leaves (dry weight), add 750ml of absolute ethanol, filter after refluxing at 78°C for 15hr, then concentrate its extract to a paste to obtain 4.3g of product, and use 25ml of absolute ethanol Transfer to Erlenmeyer flask. The concentrate was made into an emulsifiable concentrate with a concentration of 2.0%, and the insecticidal activity test was carried out. The specific insecticidal effects are shown in Table 2.

Embodiment 2

[0020] Example 2: Weigh 30g of broken leaves of Tripterygium wilfordii, add 750ml of absolute ethanol, reflux at 82°C for 5hr, filter, add 750ml of absolute ethanol to the filter residue, reflux for 5hr, filter, combine the filtrates and concentrate under reduced pressure to half of the original volume , then extracted with 18 times the amount of chloroform and concentrated to a paste to obtain 3.9 g of paste, with a yield of 13.0%. This paste was made into a microemulsion with a concentration of 20%. Insecticidal activity test was carried out. It is found that it can effectively control pests such as aphids, diamondback moth, and third-instar larvae of Spodoptera litura, and the control effect can reach more than 90%. The specific insecticidal effects are shown in Table 2.

Embodiment 3

[0021] Example 3: Weigh 30g of broken leaves of Tripterygium wilfordii, add 750ml of absolute ethanol, reflux at 82°C for 5hr, filter, then concentrate the extract to obtain 4.5g of paste, add 400ml of chloroform for extraction, there is a brown precipitate, remove the precipitate Then the chloroform solution was concentrated to dryness, and transferred to a Erlenmeyer flask with 25ml of absolute ethanol. When the preparation is diluted to 2400ml, after 48 hours of observation, its lethality to the third instar larvae of Spodoptera litura can reach more than 80%, see Table 1 below, and see Table 2 for the specific insecticidal effect.

[0022] Table 1 Example 3 acts on the biological activity of some pests

[0023] Control object Number of test insects Death rate Death rate

[0024] CK 50 0 0

[0025] Aphids 48 40 83.3%

[0026] Diamondback moth 49 41 83.4%

[0027] Spodoptera litura 50 48 90.0%

[0028] Cotton bollworm 48 41 85.4%

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PUM

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Abstract

An extrat of tripterygium wilfordii in the form of cream for insecticiding is prepared from the leaves of tripterygium wilfordii through immersing them in organic solvent, reflux extracting and post-treating.

Description

technical field [0001] The invention belongs to the processing field of pesticide raw materials, in particular to a preparation method of tripterygium wilfordii extract as an important component in the biological pesticide formula. Background technique [0002] At present, most of the pesticides used in our country are chemical synthesis products, many pesticides contain chlorine and phosphorus organic matter, although they can effectively kill pests, but the residues on food, vegetables and fruits also pose a great threat to human health . In recent years, more than 100,000 people have been poisoned by pesticides. At the same time, the long-term use of chemical pesticides has also caused the resistance of pests, and the heavy metal elements such as chlorine, copper, arsenic, and lead contained in chemical pesticides have seriously polluted the environment and agricultural products, which is not conducive to the development of green enterprises and green food. [0003] Thr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N65/14
CPCY02A50/30
Inventor 许新德金一平叶双明张定丰
Owner ZHEJIANG MEDICINE CO LTD XINCHANG PHAMACEUTICAL FACTORY
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