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Pineapple residue hemicellulose-based pH-sensitive porous hydrogel and its preparation method and application

A porous hydrogel and hemicellulose technology, applied in other chemical processes, chemical instruments and methods, etc., can solve the problems of aggravated environmental pollution and waste of resources, and achieve low price, low equipment requirements, and simple process routes Effect

Inactive Publication Date: 2017-12-01
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] As the main waste produced in the pineapple processing process, pineapple pomace is discarded in the environment, which not only causes a lot of waste of resources, but also aggravates the degree of environmental pollution

Method used

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  • Pineapple residue hemicellulose-based pH-sensitive porous hydrogel and its preparation method and application
  • Pineapple residue hemicellulose-based pH-sensitive porous hydrogel and its preparation method and application
  • Pineapple residue hemicellulose-based pH-sensitive porous hydrogel and its preparation method and application

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Effect test

Embodiment 1

[0032] A preparation method of pineapple residue hemicellulose-based pH-sensitive porous hydrogel, specifically comprising the following steps:

[0033] (1) After the pineapple residue is crushed through 40 meshes, the delignification pretreatment is carried out at 70° C. for 3 h with a mass fraction of 5% sodium chlorite solution, and the mass-to-volume ratio of the pineapple residue to the sodium chlorite solution is 1 g: 15mL, after adding sodium chlorite solution, adjust the pH of the solution to 3.8 with acetic acid to obtain pretreated pineapple pomace;

[0034] (2) The pretreated pineapple residue is extracted using the NaOH aqueous solution graded extraction method, and the graded extraction method is divided into three stages of extraction, the mass concentration of the primary extraction lye is 2%, and the secondary extraction The mass concentration is 5%, the three-stage extraction lye mass concentration is 10%, the mass volume ratio of the pretreated pineapple poma...

Embodiment 2

[0037] A preparation method of pineapple residue hemicellulose-based pH-sensitive porous hydrogel, specifically comprising the following steps:

[0038] (1) After the pineapple residue is crushed through 40 meshes, the delignification pretreatment is carried out at 70° C. for 3 h with a mass fraction of 7.5% sodium chlorite solution, and the mass volume ratio of the pineapple residue to the sodium chlorite solution is 1 g: 20mL, after adding sodium chlorite solution, adjust the pH of the solution to 3.9 with acetic acid to obtain pretreated pineapple pomace;

[0039] (2) The pretreated pineapple residue is extracted using the NaOH aqueous solution graded extraction method, and the graded extraction method is divided into three stages of extraction, the mass concentration of the primary extraction lye is 2%, and the secondary extraction The mass concentration is 5%, the mass concentration of the three-stage extraction lye is 10%, the mass volume ratio of the pretreated pineappl...

Embodiment 3

[0042] A preparation method of pineapple residue hemicellulose-based pH-sensitive porous hydrogel, specifically comprising the following steps:

[0043] (1) After the pineapple residue is crushed through 40 meshes, the delignification pretreatment is carried out at 70° C. for 3 h with a mass fraction of 10% sodium chlorite solution, and the mass-to-volume ratio of the pineapple residue to the sodium chlorite solution is 1 g: 25mL, after adding sodium chlorite solution, adjust the pH of the solution to 4.0 with acetic acid to obtain pretreated pineapple pomace;

[0044] (2) The pretreated pineapple residue is extracted using the NaOH aqueous solution graded extraction method, and the graded extraction method is divided into three stages of extraction, the mass concentration of the primary extraction lye is 2%, and the secondary extraction The mass concentration is 5%, the mass concentration of the three-stage extraction lye is 10%, the mass volume ratio of the pretreated pineappl...

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Abstract

The invention belongs to the technical field of polymer materials, and discloses a pineapple residue hemicellulose-based pH-sensitive porous hydrogel as well as its preparation method and application. The method is as follows: firstly, the pineapple residue is pretreated, and then the hemicellulose in the pretreated pineapple residue is extracted by an alkaline liquid fractional extraction method, washed and freeze-dried to obtain the hemicellulose; the hemicellulose is dissolved in deionized water, Add porogen, heat and stir to make it mix evenly and completely dissolve to obtain solution I; add monomer and initiator to solution I, continue stirring, then add cross-linking agent, stir until the system is completely dissolved and the solution is clear and transparent , let stand, soak and wash, and freeze-dry to obtain the pineapple residue hemicellulose-based pH-sensitive porous hydrogel. The preparation method of the invention is simple, and the source of raw materials is abundant; the pore size of the prepared porous hydrogel is controllable and has good texture properties, mechanical properties and pH sensitivity, and can be applied in the fields of medicine and adsorption.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a pineapple residue hemicellulose-based pH-sensitive porous hydrogel and a preparation method and application thereof. Background technique [0002] As the main waste produced in the pineapple processing process, pineapple pomace is discarded in the environment, which not only causes a lot of waste of resources, but also aggravates the degree of environmental pollution. Studies have shown that pineapple residue contains a large amount of hemicellulose, which provides a direction to try for the deep processing and comprehensive utilization of pineapple residue. Hemicellulose is a low-molecular-weight polysaccharide. The main structural units are D-xylose, L-arabinose, D-galactose and other neutral sugars and a small amount of uronic acid. The structure of hemicellulose contains many Active hydroxyl groups provide the basis for the modification of hemicellulo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F251/00C08F220/56C08F222/38C08B37/14C08J9/26A61L15/28A61K47/36B01J20/24B01J20/30
Inventor 黄惠华周端周萌
Owner SOUTH CHINA UNIV OF TECH
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