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Method for extracting natural haematochrome from larch bark

A technology of natural red pigment and pine bark, applied in natural dyes, chemical instruments and methods, sustainable manufacturing/processing, etc., can solve problems such as unfavorable industrialization of larch bark red pigment, pollution of red pigment products, poor extraction effect, etc. , to achieve the effect of easy control of operating parameters, good separation and purification effect, and high extraction efficiency

Inactive Publication Date: 2013-04-17
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, the extraction method of larch bark red pigment mainly adopts solvent extraction, which takes a long time and consumes a lot of energy, and the extraction effect is poor; the main method of purification is solvent extraction, and the solvent used is easy to pollute the red pigment product, which is not conducive to the larch bark red pigment further industrialization of

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1 extracts natural red pigment from larch bark

[0030] Including the following steps:

[0031] (1) Crush 20 g of larch bark into particles with a particle size of 20 to 80 mesh, put it into 700 mL of 60% acetone solution, place it under the condition of 35 ° C for 60 min, and ultrasonic frequency is 20 KHz to obtain the bark extract stock solution.

[0032] (2) Centrifuge at a speed of 4000r / min for 5 minutes while it is hot, and the centrifugation time is 5 minutes, and vacuum filter the supernatant under the condition of vacuum degree -0.098MPa to obtain the filtrate.

[0033] (3) Dry the filtrate in an oven at 50°C for 24 hours to obtain the crude product. Take an appropriate amount of crude product and prepare 1.0 L of a solution with a concentration of 10.0 mg / ml in 50% ethanol solution, filter through a 0.45 μm microfiltration membrane, and then separate through an ultrafiltration membrane with a molecular weight cut-off of 10 kD to obtain a retentate...

Embodiment 2

[0035] Embodiment 2 extracts natural red pigment from larch bark

[0036] (1) Crush 20 g of larch bark into particles with a particle size of 30-40 mesh, put it into 1000 mL of 70% acetone solution, place it under the condition of 45 ° C for 90 min, and ultrasonic frequency is 40 KHz to obtain the bark extract stock solution.

[0037] (2) Centrifuge at a speed of 4000r / min for 5 minutes while it is hot, and the centrifugation time is 5 minutes, vacuum filter the supernatant under the condition of vacuum degree -0.098MPa to obtain the filtrate;

[0038] (3) Dry the filtrate in an oven at 50°C for 36 hours to obtain the crude product. The crude product was prepared with 70% ethanol solution to 1.0 L of a solution with a concentration of 2.0 mg / ml, filtered through a 0.45 μm microfiltration membrane, and then separated by an ultrafiltration membrane with a molecular weight cut-off of 20 kD to obtain a retentate.

[0039] (4) Concentrate the retentate under reduced pressure with ...

Embodiment 3

[0040] Embodiment 3 extracts natural red pigment from larch bark

[0041] According to the same operation as in Example 2, ethanol was used as the extraction solvent. The specific steps are:

[0042] (1) Crush 20 g of larch bark into particles with a particle size of 30-40 mesh, put it into 1000 mL of 70% ethanol solution, place it under the condition of 45 ° C for 90 min, and the ultrasonic frequency is 40 KHz to obtain the bark extract stock solution.

[0043] (2) Centrifuge at a speed of 4000r / min for 5 minutes while it is hot, and the centrifugation time is 5 minutes, vacuum filter the supernatant under the condition of vacuum degree -0.098MPa to obtain the filtrate;

[0044] (3) Dry the filtrate in an oven at 50°C for 36 hours to obtain the crude product. The crude product was prepared with 70% ethanol solution to 1.0 L of a solution with a concentration of 2.0 mg / ml, filtered through a 0.45 μm microfiltration membrane, and then separated by an ultrafiltration membrane ...

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Abstract

The present invention provides a method for extracting natural haematochrome from larch bark. The natural haematochrome is obtained by ultrasonic-assisted acetone extraction of the larch bark and membrane integration isolation and purification. The present invention makes use of larch bark collected from Great Khingan, the raw material is easy to get, and the cost is low. The ultrasonic is used for producing physical effects such as strong vibration, cavitation effect and stirring to destroy cell walls of plant cells so that the extraction solvent of acetone permeates into cells, and the active ingredients are soluble in the extraction solvent, thereby improving the extraction efficiency. At low temperature, the active ingredient of haematochrome is prevented from damage to a great extent. The extraction of haematochrome from the larch bark is realized successfully with high yield and high efficiency. The membrane integration purification has the characteristics of high efficiency, the undestroyed extracted material, and environmental protection.

Description

technical field [0001] The invention relates to a plant pigment extraction process, in particular to a method for extracting natural red pigment from larch bark. Background technique [0002] Larch bark is an important forestry by-product in my country. It has a wide range of sources and is abundant and renewable. At present, its main use is to extract tannin extract for tanning. The utilization rate is less than 50% of the resource, and the added value of the product is low. [0003] Studies have shown that larch bark contains about 16% proanthocyanidins. Proanthocyanidins with different degrees of polymerization have different application values ​​because of their different biochemical activities. For example, tea polyphenols are rich in catechins, which are recognized as natural antioxidants; oligomeric proanthocyanidins have biological activities such as scavenging free radicals, anti-oxidation, protecting cardiovascular and cerebrovascular, and inhibiting tumors; polym...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09B61/00
CPCY02P20/10
Inventor 张力平罗书勤张小丽崔晓霞王璇张相
Owner BEIJING FORESTRY UNIVERSITY
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