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Two-phase high-efficiency extraction method of eucommia ulmoides gum

An extraction method, the technology of eucommia gum, which is applied in the field of eucommia gum extraction, can solve the problems of easy destruction of macromolecules, low purity of eucommia gum, and high cost, and achieve the effect of low equipment operation cost, low requirements for extraction equipment, and low cost

Pending Publication Date: 2020-10-09
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a dual-phase high-efficiency extraction method for Eucommia gum taking any one or more of Eucommia ulmoides leaves, Eucommia bark, and Eucommia samara pericarp as raw materials, so as to solve the problem of low efficiency and low cost of existing extraction methods. High, low purity, and the macromolecules of Eucommia gum are easily destroyed. The raw materials are treated with an aqueous solution of inorganic compounds to decompose the lignin and hemicellulose in the cell wall, improve the permeability of the cells, and expose the components of Eucommia gum. At the same time, use Due to the high solubility of organic solvents on eucommia gum, the eucommia gum is transferred to the organic phase and separated to obtain high-purity eucommia gum

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A two-phase high-efficiency extraction method for eucommia gum, comprising the steps of:

[0024] (1) get Eucommia pericarp 30g and mix with the NaOH solution 450g that mass fraction is 10%;

[0025] (2) Add 150mL of petroleum ether with a boiling range of 60-90°C, stir and extract at 70°C for 1 hour;

[0026] (3) Take out the petroleum ether solution in the upper layer, then add 150 mL of new petroleum ether to the remaining solution, and continue reflux extraction and stirring for 2 hours;

[0027] (4) Take out the upper layer petroleum ether solution, mix it with the petroleum ether solution gained in step (3), evaporate and recover the petroleum ether while it is hot, obtain the solid matter of Eucommia gum, dry it, and the extraction rate of Eucommia gum after drying is measured 18.8% of the weight of the peel and a purity of 94.37%.

[0028] The petroleum ether obtained in the evaporation process can be reused in the above-mentioned extraction process.

Embodiment 2

[0030] A two-phase high-efficiency extraction method for eucommia gum, comprising the steps of:

[0031] (1) get Eucommia pericarp 30g and mass fraction be 10% Na 2 CO 3 Mix with 900g of aqueous solution of 5% NaOH;

[0032] (2) Add 180mL of petroleum ether with a boiling range of 60-90°C, stir and extract at 85°C for 1 hour;

[0033] (3) Take out the petroleum ether solution in the upper layer, then add 200 mL of new petroleum ether to the remaining solution, and continue reflux extraction and stirring for 2 hours;

[0034] (4) Take out the petroleum ether solution in the upper layer, mix it with the petroleum ether solution obtained in step (3), evaporate and reclaim the petroleum ether while it is hot, and obtain 50 mL of Eucommia gum viscous liquid;

[0035] (5) Add the concentrated solution of eucommia gum to 100mL of ethanol containing 25% water while it is hot, separate out solids, filter to obtain the solid matter of eucommia gum, and dry it naturally to obtain bloc...

Embodiment 3

[0038] A two-phase high-efficiency extraction method for eucommia gum, comprising the steps of:

[0039] (1) 30g mass fraction is the NaOH aqueous solution of 10% and Eucommia bark 30g evenly stirring and mixing;

[0040] (2) Add 120mL of toluene, stir and extract at 75°C for 1h;

[0041] (3) Take out the toluene solution in the upper layer, then add 120 mL of toluene to the remaining solution, and continue reflux extraction and stirring for 2 h;

[0042](4) Take out the toluene solution in the upper layer, mix it with the toluene solution obtained in step (3), evaporate and recover the toluene, and obtain the Eucommia gum concentrate, leave it at -10°C for 2 hours, precipitate the Eucommia gum, and dry the obtained Eucommia gum naturally to obtain Block eucommia gum, after drying, the extraction rate of eucommia gum is determined to be 10.2% of the dry bark weight, and the purity is 94.5%.

[0043] The toluene after the separation of eucommia gum can be reused in the above-...

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Abstract

The invention discloses a two-phase high-efficiency extraction method of eucommia ulmoides gum. The method takes any one or two or more of eucommia ulmoides leaves, eucommia ulmoides bark and eucommiaulmoides samara peel as the raw materials, and comprises the following steps of: mixing the raw materials with an inorganic compound aqueous solution with a mass fraction of 1-15%, adding an organicsolvent into the mixed solution to form a water phase-organic phase two-phase system, and performing heating and stirring on the two-phase system at a temperature of 50-110DEG C; and after heating isfinished, collecting the organic phase, and separating the eucommia ulmoides gum from the organic phase to obtain the eucommia ulmoides gum. According to the method, lignin in cell walls in the raw materials is decomposed through the inorganic compound aqueous solution, the permeability of cells is improved, dissolution of gum substances in the cells is accelerated, and high-purity eucommia ulmoides gum can be obtained in an environment-friendly mode.

Description

technical field [0001] The invention relates to a method for extracting eucommia gum, in particular to a two-phase high-efficiency extraction method for eucommia gum. Background technique [0002] Eucommia ulmoides gum is contained in the leaves, skins and seeds of Eucommia ulmoides, among which Eucommia ulmoides leaves (2% to 4% glue content), Eucommia bark (7% to 12% glue content) and Eucommia ulmoides seed skin (12% to 12% glue content) 18%). The molecular structure of eucommia gum is trans-polyisoprene, which has a unique "rubber-plastic duality". It can develop three functional materials of thermoplasticity, thermoelasticity and rubber elasticity, and has a very broad application prospect. The extraction process of eucommia gum is the main bottleneck of industrial utilization, but the problems of high cost, low efficiency, low yield, low purity, low raw material utilization rate and serious environmental pollution in the extraction process have seriously affected the d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/00C08L7/00
CPCC08J3/00C08J2307/00
Inventor 樊永明张继川
Owner BEIJING FORESTRY UNIVERSITY
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