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Method for selectively and efficiently extracting flavones from licorice herb residues and co-producing biomethane

A technology for licorice dregs and licorice herbs is applied in the preparation of sugar derivatives, sugar derivatives, sugar derivatives, etc., and achieves the effects of increasing startup speed and gas production, simplifying separation and purification steps, and improving conversion efficiency.

Pending Publication Date: 2021-10-08
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current deep eutectic solvent extract is still total flavonoids or a mixture of flavonoids, and further steps such as separation, purification, and refining are required to improve the added value and economy of the extract
Taking the total flavonoids of licorice as an example, the specific components mainly include liquiritigenin, isoliquiritigenin, liquiritin and isoliquiritin, and so far, there is no method for selective extraction of different types of flavonoids in licorice dregs

Method used

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  • Method for selectively and efficiently extracting flavones from licorice herb residues and co-producing biomethane
  • Method for selectively and efficiently extracting flavones from licorice herb residues and co-producing biomethane
  • Method for selectively and efficiently extracting flavones from licorice herb residues and co-producing biomethane

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Configure the deep eutectic solvent according to the hydrogen bond acceptor and hydrogen bond donor and their molar ratio shown in Table 1 (according to Abbott et al.Chemical communications 2003, 9:70-1 method), then the solid-liquid ratio is 1:20 Add licorice residue (g / mL) (glycyrrhizae residue plus 5 times of water, boil for half an hour to obtain the residue), the extraction condition is 50°C-30min, the mixed system after extraction is separated from solid and liquid, and the extraction of total flavonoids is calculated rate and removal rate of lignin-cellulose-hemicellulose.

[0033] Table 1 Composition of different deep eutectic solvents

[0034] Numbering hydrogen bond acceptor hydrogen bond donor The molar ratio of 1 L-menthol (thin) Acetic acid 1：1 2 L-menthol (thin) propionic acid 1：1 3 L-menthol (thin) butyric acid 1：1 4 L-menthol (thin) caproic acid 1：1 5 L-menthol (thin) bitter 1：1 6 L-menth...

Embodiment 2

[0037] Choline chloride and glycolic acid were prepared in a molar ratio of 1:3 to obtain a deep eutectic solvent (according to Abbott et al. %, 30%, to obtain two deep eutectic solvent systems with different water contents, then add licorice dregs to the two systems according to the solid-liquid ratio of 1:15 (g / mL) The medicinal residues obtained in half an hour), the extraction conditions are 30min, 50min, 70min, 90°C for 30min, 60min, 90min, 120min, the mixed system after extraction is filtered for solid-liquid separation, and the sum of liquiritin, isoliquiritin and liquiritinin in the liquid is calculated The extraction rate of isoliquiritigenin.

[0038] The result is as image 3 As shown, the deep eutectic solvent can extract liquiritin and isoliquiritin with high selectivity at low temperature (30-50° C.), and extract liquiritin and isoliquiritigenin with high selectivity at high temperature (70-90° C.). And under the condition of low temperature (30~50℃), the short...

Embodiment 3

[0040]Choline chloride and glycolic acid are prepared in a molar ratio of 1:3 to prepare a deep eutectic solvent (according to Abbott et al. Chemical communications 2003, 9:70-1 method), and water is added to make the deep eutectic solvent have a moisture content of 20% , and then according to the solid-liquid ratio of 1:15 (g / mL), add licorice dregs (glycyrrhizae plus 5 times of water, boil for half an hour to obtain dregs), the extraction condition is 30 ° C for 30 min, and the mixed system after extraction is filtered solid-liquid separate.

[0041] It is measured that the liquid is rich in liquiritin and isoliquiritin, the extraction rate is 8.7mg / g licorice residue, the purity is 95.4%, and the solid phase residue is directly connected to the anaerobic according to the method reported in the literature (Bioresour. Ferment the strains and ferment for 30 days to obtain biomethane. Its biomethane production is increased by about 120% relative to the untreated feedstock.

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Abstract

The invention discloses a method for selectively and efficiently extracting flavones from licorice herb residues and co-producing biological methane. The method comprises the following steps: firstly, mixing choline chloride and glycollic acid to obtain a deep eutectic solvent, then adding the licorice herb residues to carry out extraction reaction under the reaction conditions of extraction at 30-50 DEG C for 30-120 minutes or extraction at 70-90 DEG C for 30-120 minutes, and respectively preparing liquiritin and isoliquiritin and / or liquiritigenin and isoliquiritigenin; and carrying out solid-liquid separation on an extracted mixed system to obtain solid-phase residues, and directly inoculating anaerobic fermentation strains to carry out biological fermentation to obtain the biological methane. According to the method, by constructing a temperature-sensitive deep eutectic solvent system, selective extraction of different types of flavonoids in the licorice herb residues is achieved, meanwhile, a lignin-cellulose-hemicellulose compact structure of the licorice herb residues is damaged, contact digestion of microorganisms and cellulose is facilitated, and the anaerobic fermentation starting speed and the gas production rate are greatly increased.

Description

technical field [0001] The invention belongs to the technical field of resource utilization of organic solid waste, and in particular relates to a method for selectively and efficiently extracting flavonoids from licorice residues and co-producing biomethane. Background technique [0002] The annual production of traditional Chinese medicine dregs in my country reaches 30 million tons. Conventional treatment methods such as landfill, incineration, and stacking in fixed areas take up a lot of land and cause serious pollution to the surrounding water, soil, and air. Traditional Chinese medicine dregs contain a large amount of sugars, proteins, organic acids, oils, lignin, cellulose, hemicellulose, amino acids and a variety of high-value active ingredients. Direct discarding will cause a great waste of resources. Low carbon, environmental protection" development concept is contrary. Bio-refining energy and chemicals from traditional Chinese medicine residues is one of the focu...

Claims

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Application Information

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IPC IPC(8): C07H1/08C07H15/26C07H15/203C07D311/32C07D311/40C07C45/79C07C49/835C12P5/02
CPCC07H1/08C07H15/26C07H15/203C07D311/32C07D311/40C07C45/79C12P5/023C07C49/835Y02E50/30
Inventor 余强谢君钟家伟毕桂灿
Owner SOUTH CHINA AGRI UNIV
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