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Method for extracting flavones, low-molecule pectin and cellulose from orange peels in combined way

A low-molecular-weight pectin and combined extraction technology is applied in the field of low-molecular-weight pectin, cellulose, and flavonoid extraction. The effect of improving color quality and improving economic efficiency

Active Publication Date: 2015-01-07
ZHEJIANG CITRUS RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] At present, there are many technologies for extracting one or two of the three components of flavonoids, low molecular weight pectin and cellulose from citrus peels. Most of them use organic solvents such as ethanol to extract flavonoids first, and then use strong acid to extract pectin, or Only pectin is extracted but not flavonoids; a large amount of cellulose-rich pomace is discarded as waste, which pollutes the environment and wastes resources
The acquisition of low-molecular-weight pectin usually requires the use of chemical methods or biological enzymes to degrade pectin products, which cannot be synchronized with the extraction of flavonoids or pectin, and most of the obtained products are monosaccharides or oligosaccharides. sugar production is not high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Weigh 100g of fresh ponkan peel and cut into 2.5mm 2 fragments, add saturated Ca(OH) 2 Solution 1000ml (measured pH is 12.53), vacuumize to -0.06MPa, heat and extract at 60°C for 30min, filter and separate skin dregs for later use, and use rutin as reference substance, measure the total flavonoid content in the filtrate with a spectrophotometer 0.295 mg / ml, adjust the pH of the filtrate to about 4.5 with 0.5 mol / L HCl, let it sit for 8 hours, filter it with suction, and dry it to obtain a filter cake of 0.84 g, which is the crude flavonoid.

[0030] Add the above dregs to 200ml of tap water, concentrate H 2 SO 4 About 0.5ml (the measured pH is 1.8), heated to 95°C and kept for extraction for 30 minutes, filtered through 150 mesh gauze to separate the filter residue for later use, added an equal volume of 95% edible alcohol to the filtrate, and filtered after the precipitation was stable. Dry at ℃ and pulverize to obtain 2.44g of low molecular weight pectin.

[0031]...

Embodiment 2

[0033] Weigh 100g of dried ponkan peel, grind it into a relatively uniform slag, add saturated Ca(OH) 2 Solution 1000ml (measured pH is 12.08), vacuumize to -0.09MPa, extract at 70°C for 30min, filter and separate skin dregs for later use, and use rutin as reference substance, measure the total flavonoid content in the filtrate with a spectrophotometer 0.981 mg / ml, adjust the pH of the filtrate to about 4.5 with 0.5 mol / L HCl, let it stand for 8 hours, filter it with suction, and dry it to obtain a filter cake of 3.31 g, which is the crude flavone.

[0034] Add the above skin dregs to 500ml of tap water, concentrate H 2 SO 4 About 1ml (the measured pH is 2.1), heated to 95°C and kept for extraction for 30 minutes, filtered through 150-mesh gauze to separate the filter residue for use, added an equal volume of 95% edible alcohol to the filtrate, filtered after the precipitation was stable, and put the filter cake at 50°C drying and crushing to obtain 8.22 g of low-molecular-w...

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Abstract

The invention provides a method for extracting flavones, low-molecule pectin and cellulose from orange peels in a combined way. According to the method, the low-molecule pectin and the cellulose are selectively retained simultaneously when the flavones are extracted under an alkaline condition, so that the three components are extracted in a combined way and the orange peels are utilized efficiently; flavones-type compounds are extracted from the orange peels under a negative pressure condition, and the boiling point of an extraction solvent is lowered; bubbles generated in the orange peels under a micro-boiling state play a role of accelerating cell rupture, so that the flavones are promoted to be dissolved out, the extraction time is shortened and only parts of pectin molecular chains rupture, so that a large amount of low-molecule pectin is generated; and the flavones-type compounds are extracted and separated from the orange peels, the pigment-type impurities in the low-molecule pectin and the cellulose are reduced, a large quantity of bleaching solvent is saved, and the method is beneficial to maintaining the color and the luster of finished products of the low-molecule pectin and the cellulose.

Description

technical field [0001] The invention relates to a plant processing method, in particular to a method for extracting flavonoids, low-molecular pectin and cellulose from citrus peel. Background technique [0002] Citrus peel accounts for about 20% of the whole fruit weight, and the peel contains pectin, essential oil and flavonoids. In recent years, my country's annual output of citrus has reached 20 million tons. Among them, if a large number of peels produced by the citrus fruit processing industry are fully utilized, their economic value may even exceed that of the pulp. [0003] Low-molecular-weight pectin is a water-soluble oligosaccharide with a molecular weight of about 5,000 to 10,000 Daltons. Compared with commercial pectin with a molecular weight of up to 50,000 Daltons, it cannot be used as a product because of its greatly reduced viscosity. Thickener, stabilizer, etc. used. However, it has unique medical and health care functions. Studies have found that citrus l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61K36/752C08B37/06A61K131/00
Inventor 曹雪丹方修贵赵凯
Owner ZHEJIANG CITRUS RES INST