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Method for extracting persimmon leaf essential oil from persimmon leaves

A technology of persimmon leaf extract and persimmon leaf, applied in the field of extracting persimmon leaf essential oil

Inactive Publication Date: 2008-06-25
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no report on the use of hydrophilic ionic liquids for extracting persimmon leaf essential oil from persimmon leaves

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] 20g of shade-dried persimmon leaves were pulverized, passed through a 40-mesh sieve, and then 100ml of hydrophilic ionic liquid [BMIM]AcO was added thereto, and microwave heating was used (heating temperature was 120°C) until the persimmon leaves were completely dissolved. Microwave frequency 2450MHz, then adopt the conventional steam distillation method to extract the light yellow oily liquid that is the persimmon leaf essential oil 366mg, and adopt the conventional steam distillation method to get the light yellow oily liquid 264mg, the productive rate increases by 38.63%, the two are relatively Density, refractive index and UV absorption peaks are consistent.

Embodiment 2

[0014] 20g of shade-dried persimmon leaves were pulverized, passed through a 40-mesh sieve, then 150ml of hydrophilic ionic liquid [BMIM]Cl was added thereto, and microwave heating was used (heating temperature was 100°C) until the persimmon leaves were completely dissolved. Microwave frequency 2450MHz, then adopt conventional steam distillation method to extract and obtain light yellow oily liquid namely persimmon leaf essential oil 324mg, and adopt conventional steam distillation method to obtain light yellow oily liquid 264mg, productive rate increases 22.7%, both relatively Density, refractive index and UV absorption peaks are consistent.

Embodiment 3

[0016] 20g of shade-dried persimmon leaves were pulverized, passed through a 40-mesh sieve, and then 120ml of hydrophilic ionic liquid [AMIM]Cl was added thereto, and heated by microwaves (heating temperature was 80°C) until the persimmon leaves were completely dissolved. Microwave frequency 2450MHz, adopt conventional steam distillation method to extract then and obtain light yellow oily liquid namely persimmon leaf essential oil 331mg, and adopt conventional steam distillation method to obtain light yellow oily liquid 264mg, productive rate increases 25.4%, both relatively Density, refractive index and UV absorption peaks are consistent.

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Abstract

The invention relates to a method extracting persimmon leaf essence oil from persimmon leaves. The differences are that: at first, the persimmon leaves dried in shade are crushed and then sieved through a 40-mesh screen, then the hydrophilic ion liquid is added, the mass volume ratio of the persimmon leaves and the hydrophilic ion liquid is 1: 2-20 (g:ml), then the microwave is adopted to heat the persimmon leaves until that the persimmon leaves are completely dissolved, the frequency of the microwave is 2450MHz, then the routine steam distillation method is adopted to obtain the persimmon leaf essence oil, the heating temperature of the microwave is between 80 and 120 DEG C, the hydrophilic ion liquid is any one of [BMIM]AcO, [BMIM]Cl or [AMIM]Cl. The invention has the advantages that: 1) the invention has simple preparation method, good persimmon leaf essence oil quality and higher yield which is 20 to 40 percent higher than the yield directly adopting the steam distillation method; 2) the hydrophilic ion liquid adopts the ion exchange method to reclaim and reuse, can not lead to environmental pollution.

Description

technical field [0001] The invention relates to a method for extracting persimmon leaf essential oil from persimmon leaves. Background technique [0002] Persimmon trees are cultivated as fruit trees in my country and have a wide distribution. For a long time, persimmon leaf resources have not been well developed and utilized. Extracting persimmon leaf essential oil from persimmon leaves is an effective way to utilize persimmon leaf resources. Persimmon leaf essential oil is a light yellow oily liquid with light persimmon aroma, widely used in food and beverage industry. At present, steam distillation, organic solvent extraction and supercritical extraction are mainly used to extract persimmon leaf essential oil from persimmon leaves. Among them, steam distillation is the most widely used method, and the quality of persimmon leaf essential oil obtained by it is good, but the yield is low. [0003] Hydrophilic ionic liquids are a group of organic liquid substances composed ...

Claims

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Application Information

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IPC IPC(8): C11B9/00C11B1/16
Inventor 朱圣东吴元欣陈启明丁一刚陈龙喻子牛邓凡王红波
Owner WUHAN INSTITUTE OF TECHNOLOGY
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