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Method for preparing pectin by using waste sisal dregs

A technology of sisal dregs and pectin, which is applied in the field of preparing pectin from waste sisal dregs produced in the process of sisal fiber production, can solve the problems of high impurity content and high energy consumption, and achieve low impurity content and low energy consumption , light color effect

Inactive Publication Date: 2010-09-22
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition to the disadvantages of traditional acid hydrolysis extraction, this method adopts vacuum concentration technology for filtrate concentration, which has the disadvantages of high energy consumption and high impurity content in pectin due to simultaneous concentration of impurities.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Weigh 500g of dried sisal slag, add 10 times the weight of water to soak and soften, filter, put the sisal slag into boiling water, inactivate the enzyme for 5 minutes, and then filter. Rinse the enzyme-inactivated slag twice with water at 30°C 4 times the volume of the filter residue, keep the temperature for 20 minutes each time, and filter. Add 4 times the volume of sisal slag to the rinsed hemp residue, adjust the pH to 1.2 with 1:1 (V / V) hydrochloric acid solution, microwave-assisted acid water extraction for 20 minutes, the extraction temperature is 90 ° C, and repeat the extraction operation 3 times, combine the extracts, filter the extracts with a suction filter bottle, and then separate and concentrate with a nanofiltration membrane to obtain a sisal pectin concentrate. Add 95% edible ethanol 2 times the volume of the concentrated solution to the concentrated solution, fully stir at room temperature, let stand for 3 hours, centrifuge, filter, wash the precipita...

Embodiment 2

[0021] Weigh 1500g of dried sisal slag, add 15 times the weight of water to soak and soften, filter, put the sisal slag into boiling water, inactivate the enzyme for 10 minutes, and then filter. Rinse the enzyme-inactivated slag with water at 35°C 3 times the volume of the filter residue for 3 times, keep the temperature for 30 minutes each time, and filter. Add 3 times the volume of sisal slag to the rinsed hemp residue, adjust the pH to 1.8 with a 1:1 (V / V) hydrochloric acid solution, microwave-assisted acid water extraction for 25 minutes, and the extraction temperature is 95 ° C, repeat the extraction operation 3 times, combine the extracts, filter the extracts with a suction filter bottle, and then separate and concentrate with a nanofiltration membrane to obtain a sisal pectin concentrate. Add 95% edible ethanol 3 times the volume of the concentrated solution to the concentrated solution, stir well at room temperature, let stand for 3 hours, centrifuge and filter. The p...

Embodiment 3

[0023] Rinse the fresh sisal residue after fiber extraction with tap water quickly, and press dry. Weigh 2000g of fresh sisal slag that has been pressed to dryness, put it into boiling water, inactivate the enzyme for 8 minutes, and then filter. Rinse the enzyme-inactivated slag with water at 40°C twice the volume of the filter residue for 4 times, keep the temperature for 25 minutes each time, and filter. Add 2 times the volume of sisal slag to the rinsed hemp residue, adjust the pH to 1.5 with a 1:1 (V / V) hydrochloric acid solution, microwave-assisted acid water extraction for 30 minutes, and the extraction temperature is 85 ° C, repeat the extraction operation 3 times, combine the extracts, filter the extracts with a suction filter bottle, and then separate and concentrate with a nanofiltration membrane to obtain a sisal pectin concentrate. Add 95% edible ethanol of 2 times the volume of the concentrated solution to the concentrated solution, stir fully at room temperature...

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Abstract

The invention discloses a method for preparing pectin by using waste sisal dregs. By utilizing the waste sisal dregs as raw materials, the method for preparing the pectin comprises the steps of pretreatment of the raw materials, enzyme inactivation, water rinsing, microwave assisted acid water extraction, extracting solution treatment and concentration, alcohol precipitation, filtration and drying. Compared with the prior art, the method has the advantages of: 1, high pectin yield, low impurity content, simple process, low energy consumption and easy large batch production of the pectin; 2, short extraction time and high yield by using the microwave for assisting in the extraction during the decomposition of the acid water; low energy consumption, low impurity content and easy industrialization by using the membrane separation technology for filtrate concentration; and light color of the obtained product and no need of color removal by using the freeze drying technology for the drying process. The pectin obtained by the method is low methoxyl pectin and has the advantages of good solubility and easy formation of gel.

Description

technical field [0001] The invention relates to a method for preparing pectin, in particular to a method for preparing pectin by utilizing waste sisal residue produced in the sisal fiber production process. Background technique [0002] Pectin is a natural polymer compound, safe and non-toxic, with a wide range of uses. In the food industry, it is often used as a gelling agent, thickener, stabilizer and emulsifier; in the cosmetics industry, it can enhance the skin's resistance and prevent ultraviolet radiation. Used in the pharmaceutical industry, it has the functions of antibacterial, anti-inflammatory, hypoglycemic and lipid-lowering, inhibiting the proliferation of cancer cells, reducing the damage of anticancer drugs to gastrointestinal mucosa, absorbing toxic metal ions, etc., and can also be used to prepare sustained-release drugs. The annual demand for pectin in the world is nearly 45,000 tons. At present, my country consumes more than 2,000 tons of pectin every yea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/06
Inventor 林翠梧张雪红姚先超黄艳伟丁建东
Owner GUANGXI UNIV
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