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Method for extracting bacteriostatic agent from bamboo leaves with water

A bacteriostatic agent and bamboo leaf technology, which is applied in the field of daily chemicals, can solve the problems of time-consuming process and achieve the effects of low production cost, simple process flow and extended shelf life

Inactive Publication Date: 2010-11-24
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] These two methods all inevitably use a large amount of ethanol as the extractant, directly discard the low-polarity components obtained by petroleum ether extraction, and only further process the water phase components, and obtain the product after several column chromatography , the process takes a long time

Method used

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  • Method for extracting bacteriostatic agent from bamboo leaves with water

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Experimental program
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Effect test

Embodiment 1

[0027] Put 500g of bamboo leaves in a water tank, add 12.5L of water, heat to 95°C for extraction for 2 hours, and filter out the extract; add 7.5L of water to the residue, extract for 2 hours under the same conditions, remove the residue, and combine two leaching solution; concentrated in a water bath at 55°C to 1L under reduced pressure; added ethanol to make the final concentration of ethanol in the system 60% to 70%, stirred and mixed thoroughly, stood overnight and then filtered, concentrated the clear liquid to dryness, and obtained a crude extract after drying 77.7 g.

[0028] Disperse the crude extract with 100-200mL of water and use petroleum ether liquid-liquid extraction, each time with 50mL petroleum ether, extract 2 to 4 times until it is colorless, combine the upper petroleum ether clear liquid, recover the solvent, and vacuum the concentrate After drying, 0.315 g of product I was obtained as a pale yellow oil. Add chloroform to the remaining aqueous solution in...

Embodiment 2

[0030] Weigh 500g of bamboo leaves, put them in a water tank, add 10L of water to submerge the bamboo leaves, heat to 85°C and extract twice, each time for 3 hours, the amount of water added for the second extraction can be appropriately reduced depending on the situation, and it is better to submerge the bamboo leaves . Combine the two extracts and concentrate under reduced pressure to about 800mL, add ethanol for precipitation, so that the final concentration of ethanol in the system is 60% to 70%, after the filtrate is concentrated to about 500mL, extract sequentially according to the above method, recover each part of the solvent, and obtain the product I 0.3293g, Product II 1.1966g, Product III 1.9675g.

Embodiment 3

[0032] Weigh 500g of bamboo leaves, put them in a water tank, add 10L of water to submerge the bamboo leaves, heat to 85°C and extract twice, each time for 3 hours, the amount of water added for the second extraction can be appropriately reduced depending on the situation, and it is better to submerge the bamboo leaves . Combine the two extracts and concentrate under reduced pressure to about 800 mL, add ethanol for precipitation, make the final concentration of ethanol in the system 60% to 70%, and concentrate the filtrate to about 1000 mL. Divide into two parts on average, each part of the leaching solution is about 500mL, one part is directly extracted with chloroform, and each time it is extracted with 125-250mL of chloroform for 2 to 4 times, and the extraction is colorless, and then the extraction phase is combined to recover the solvent. The concentrate was dried to obtain 0.6037g of extract;

[0033] Another 500mL leaching solution was directly extracted with ethyl ac...

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Abstract

The invention relates to a method for extracting a bacteriostatic agent from bamboo leaves with water, belongs to the technical field of daily chemicals and relates to a method for obtaining an antiseptic bacteriostatic agent by taking current-year bamboo leaves as a raw material through a water extracting step, a solvent treating step and the like under a certain condition. The method mainly comprises the following steps of: decocting the bamboo leaves with hot water and extracting; performing alcohol precipitation treatment, centrifugal concentration and liquid extraction by adding solvent liquor; recycling a solvent; and performing vacuum drying on residues to obtain the finished product of the bacteriostatic agent. The method has the advantages of simple process, low cost, convenient operation, small equipment investment, high product activity, no pollution to the environment, easy industrial production and the like.

Description

technical field [0001] A method for extracting a bacteriostatic agent from bamboo leaves with water, relates to a method for obtaining an antiseptic and bacteriostatic agent by taking bamboo leaves of the same year as raw materials through water extraction, solvent treatment and other means under certain conditions, which belongs to daily-use chemicals technology field. Background technique [0002] According to the different sources of preservatives, preservatives can be divided into two categories: natural preservatives and synthetic preservatives. Most synthetic preservatives have certain toxicity to the human body, and some highly toxic preservatives have been banned, such as dichlorophen, bromochlorophen and so on. "Parabens" have low toxicity and are currently one of the most widely used preservatives in personal care products, but their dosage is relatively large, and their water solubility will become worse with the increase of carbon chain, which affects their Par...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N65/44A01P1/00A61K8/97
Inventor 曹光群倪向梅姚志蕊
Owner JIANGNAN UNIV
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