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Method for extracting plant pectin from hemp skin

A hemp and pectin technology, which is applied in the field of new raw materials for extracting plant pectin, can solve the problems of serious environmental pollution of degumming liquid and the inability to recycle pectin, achieve rich pectin content, increase economic value, and be easy to operate Effect

Pending Publication Date: 2019-03-19
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, in order to obtain the cellulose fiber in the hemp husk, people often use alkali degumming, acid degumming, oxidant degumming and other technologies to degumming the hemp husk to extract cellulose components. The degumming solution often contains a large amount of colloid and chemical substances. The pectin in it cannot be recycled, and the direct discharge of the degumming liquid will cause serious environmental pollution

Method used

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  • Method for extracting plant pectin from hemp skin
  • Method for extracting plant pectin from hemp skin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1. Ultrasonic pretreatment: cut cannabis into 5cm length, dry, weigh 5g, and simply wash with water; use ultrasonic wave under the conditions of ultrasonic frequency 40kHz, ultrasonic power 110W, temperature 50°C, solvent is water, and bath ratio 1:50 The hemp husk was ultrasonically processed by the processor for 35 minutes, washed and dried.

[0026] 2. Extract marijuana pectin with ammonium oxalate: prepare 3.5g / L ammonium oxalate aqueous solution with a bath ratio of 1:30, put the marijuana after ultrasonic pretreatment in the ammonium oxalate solution, and keep it warm for 50min at 95°C; take the degumming solution , filter with a 400-mesh filter cloth while it is hot; take the filtrate, adjust the pH to 4, concentrate to 15% in a rotary evaporator at 60°C, and then rapidly cool down to obtain a concentrated solution. Concentrating to 15% is the ratio of the volume of the concentrated solution to the volume of the degummed solution filtered while hot.

[0027] 3. ...

Embodiment 2

[0030] 1. Ultrasonic pretreatment: cut cannabis into 5cm length, dry, weigh 5g, and simply wash with water; use ultrasonic wave under the conditions of ultrasonic frequency 40kHz, ultrasonic power 120W, temperature 50°C, solvent is water, and bath ratio 1:50 The hemp husk was ultrasonically processed by the processor for 35 minutes, washed and dried.

[0031] 2. Extract marijuana pectin with ammonium oxalate: prepare 4g / L ammonium oxalate aqueous solution with a liquor ratio of 1:30, put the marijuana pretreated by ultrasonic waves into the ammonium oxalate solution, and keep it warm for 40min at 100°C; take the degumming solution, Filter while hot with a 400-mesh filter cloth; take the filtrate, adjust the pH to 4.5, concentrate to 20% in a rotary evaporator at 60°C, and then rapidly cool down to obtain a concentrated solution. Concentrating to 20% is the ratio of the volume of the concentrated solution to the volume of the degummed solution filtered while hot.

[0032] 3. P...

Embodiment 3

[0035] 1. Ultrasonic pretreatment: cut cannabis into 5cm length, dry, weigh 5g, and simply wash with water; use ultrasound under the conditions of ultrasonic frequency 40kHz, ultrasonic power 100W, temperature 50°C, solvent is water, and bath ratio 1:50 The hemp husk was ultrasonically processed by the processor for 40 minutes, washed and dried.

[0036] 2. Extract marijuana pectin with ammonium oxalate: prepare 3g / L ammonium oxalate aqueous solution with a bath ratio of 1:30, put the marijuana pretreated by ultrasonic waves into the ammonium oxalate solution, and keep it warm for 45min at 100°C; take the degumming solution, Filter while it is hot with a 400-mesh filter cloth; take the filtrate, adjust the pH to 5, concentrate to 20% in a rotary evaporator at 60°C, and then rapidly cool down to obtain a concentrated solution. Concentrating to 20% is the ratio of the volume of the concentrated solution to the volume of the degummed solution filtered while hot.

[0037] 3. Prec...

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Abstract

The invention discloses a method for extracting plant pectin from hemp skin. According to the method, the pectin is extracted from the hemp skin, the raw material source is wide, the content of pectinin the hemp skin is high, the amount of the pectin extracted by virtue of the method is 10.46% of the weight of the hemp skin, and the process for extracting the pectin is simple and easy in operation. Ammonium oxalate is weak-acid and weak-base salt, the degumming rate of a solution of ammonium oxalate to the hemp skin is high, the treatment conditions are mild, and the strong damage of jute fibers is small; and meanwhile, oxalate ions can be cheated with calcium ions of calcium pectate to generate soluble ammonium salt, most pectin of the hemp skin is extracted in the solution, and the ethanol precipitation of pectin is further facilitated. Therefore, ammonium oxalate is a degumming agent and a pectin extracting agent, the jute fibers are acquired through the degumming of the hemp skin,and meanwhile, colloid in hemp degumming liquid is adequately utilized, so that the waste is turned into wealth, the economic utilization value of the hemp skin is increased, and sewage discharge isreduced.

Description

technical field [0001] The invention relates to a new raw material and process for extracting plant pectin, in particular to a process for extracting pectin with hemp as the raw material, ammonium oxalate as the extractant (degumming agent) and ethanol as the precipitant. Background technique [0002] Cannabis is an annual erect herb of the Moraceae Cannabis genus, which has a wide planting area and abundant yield in my country. In addition to containing a large amount of cellulose components in the hemp husk, it also contains a large amount of pectin components. During the growth of hemp, the content of pectin components accounts for 6-20% of the total mass of the hemp stem; pectin is mainly combined with cellulose, semi Cellulose, lignin, etc. are covalently bonded to form protopectin, which is a structural substance of plants and plays a vital role in maintaining the structure and firmness of plants. [0003] At present, in order to obtain the cellulose fiber in the hemp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/06
CPCC08B37/0048
Inventor 郑振荣张莹琨杜换福黄思齐邢江元智伟
Owner TIANJIN POLYTECHNIC UNIV
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