Method for extracting lac red pigment

A technology of lac red pigment and extraction method, which is applied in the field of extraction of lac red pigment, can solve problems such as environmental pollution, and achieve the effect of non-toxic discharge

Inactive Publication Date: 2010-09-01
烟台开发区绿源生物工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The object of the present invention is to provide a kind of refining method of lac red pigment in view of t

Method used

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  • Method for extracting lac red pigment
  • Method for extracting lac red pigment
  • Method for extracting lac red pigment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1、30

[0025] The ratio of the shellac raw material of embodiment 1,30% ethanol and drying

[0026] Take the dried shellac, remove the sundries trapped therein, crush it into a coarse powder, and set aside.

[0027] Weigh 5 parts of shellac coarse powder, each 100g, put it into a 2000ml beaker, add different volumes of 30% ethanol, soak for 30 minutes when extracting for the first time, heat and reflux for extraction. Heat to a slight boil and start timing. A total of 3 extractions were performed, the first extraction was 2.5 hours, the second extraction was 2.0 hours, the third extraction was 1.5 hours, suction filtered, and the sample was vacuum-dried. The obtained sample was weighed, and the content of lac red was determined by ultraviolet spectrophotometry (UV).

Embodiment 1

[0028] Embodiment 1 result is shown in Table 1:

[0029] Table 1. The test results of shellac different amounts of 30% ethanol (ml) extraction

[0030]

[0031] As can be seen from the results of Example 1, the ratio of lac and dilute alcohol for extraction is (10~18) ml: 1g, and the total lac red can be successfully extracted, and its extraction rate is 7.6~6.9%, 2, 3, Samples 4 and 5 had more yields, but there was no significant difference in the content of lac red. Compared with No. 2 sample, the amount of dilute alcohol in No. 3 sample has increased by 12.5%, and the sample yield and content have no obvious increase. In order to save money, the extraction method of No. 2 sample is selected, that is: the ratio of shellac to dilute alcohol for extraction is Extract 1g: 12ml for the first time, 1g: 10ml for the second time, and 1g: 10ml for the third time. Better results can be obtained in industrial application.

Embodiment 2

[0032] Embodiment 2, the selection of shellac extraction time and extraction times

[0033] Weigh 5 parts of shellac coarse powder, 100g each, put them into a 2000ml beaker, add 1200ml of dilute alcohol quantitatively, soak for 30 minutes when extracting for the first time, and heat for extraction. Heating to slight boiling and starting to record the time, the extraction time is 1.0, 1.5, 2.0, 2.5, 3.0 hr respectively, suction filtration, and vacuum drying of the sample. The obtained sample was weighed, and the content of lac red was determined by ultraviolet spectrophotometry (UV).

[0034] The results are shown in Table 2:

[0035] Table 2. Total lac red yield at different extraction times

[0036]

[0037] The experimental results of Example 2 show that the extraction time of 1.0-3.0 hr is different for the yield of lac red, but there is no significant increase after 2 hr. Considering the actual production situation, the extraction time of 2.0 hr can be selected for th...

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Abstract

The invention discloses a method for extracting lac red pigment. The method comprises the following steps of: (1) smashing a dry lac material and immersing the smashed material in ethanol; and heating and refluxing the solution for extraction; (2) filtering liquid obtained by the step (1) for chromatography with a macroporous adsorption resin and eluting the liquid; and (3) concentrating eluent obtained by the step (2) and drying the eluent to obtain the lac red pigment. The method has the advantages that: (1) by using the characteristic that the lac red pigment has better solubility in solution of dilute alcohol, extracting solution is filtered and extracted by using the solution of dilute alcohol for many times; the extracting solution is adsorbed by the macroporous adsorption resin andeluted by concentrated ethanol; and the eluent is concentrated, dried and smashed to obtain concentrated and odorless lac red pigment; (2) by adopting the solution of ethanol for extraction, insoluble residue serving as a lac byproduct can be used as an industrial raw material; (3) the extracting solution passes through the macroporous adsorption resin; and the pigments of effluent are adsorbed completely and can be recycled after distillation.

Description

technical field [0001] The invention relates to a method for extracting natural pigment from natural raw materials, in particular to a method for extracting lac red pigment. Background technique [0002] Lac red pigment is a natural pigment secreted by lac insects. Lac, also known as shellac, is a kind of lac insect that parasitizes some leguminous plants, such as Dalbergia obtusifolia, D. balansae, Dalbergia chinensis (D. Szemaoensis), A red substance secreted by the branches of matchlock trees (Eriolaena malvacea), pigeonpea (Cajanus cajan), and acacia (Albizia julibrissin) after sucking tree sap. As a natural resin, shellac is widely used in national defense, electrical appliances, , coatings, machinery, rubber, plastics, medicine, leather, paper, printing, ink and food and other industrial sectors. Due to the high toxicity of chemically synthesized pigments, their application in the food industry is increasingly restricted, and natural pigments are more and more popul...

Claims

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Application Information

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IPC IPC(8): C09B61/00C09B67/10C09B67/54
Inventor 王芳
Owner 烟台开发区绿源生物工程有限公司
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