Pineapple waste hemicellulose based pH sensitive type porous hydrogel as well as preparation method and application thereof

A technology of porous hydrogel and hemicellulose, applied in other chemical processes, chemical instruments and methods, medical preparations of non-active ingredients, etc., can solve the problems of aggravating environmental pollution and waste of resources, and achieve low price, The effect of low equipment requirements and stable three-dimensional network structure

Inactive Publication Date: 2015-12-09
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 env...

Method used

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  • Pineapple waste hemicellulose based pH sensitive type porous hydrogel as well as preparation method and application thereof
  • Pineapple waste hemicellulose based pH sensitive type porous hydrogel as well as preparation method and application thereof
  • Pineapple waste hemicellulose based pH sensitive type porous hydrogel as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

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

[0033] (1) After the pineapple pomace has been pulverized for 40 meshes, a 5% sodium chlorite solution is used for delignification pretreatment at 70 ° C for 3h, and the mass volume ratio of the pineapple pomace 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 by using the NaOH aqueous solution fractional extraction method, and the fractional extraction method is divided into three-level extraction, the first-level extraction lye mass concentration is 2%, and the second-level extraction lye solution is 2%. The mass concentration is 5%, the mass concentration of the three-stage extraction lye solution is 10%, the mass-volume ratio of the pretreated pi...

Embodiment 2

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

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

[0039] (2) the pretreated pineapple residue is extracted by using the NaOH aqueous solution fractional extraction method, and the fractional extraction method is divided into three-level extraction, the first-level extraction lye mass concentration is 2%, and the second-level extraction lye solution is 2%. The mass concentration is 5%, the mass concentration of the three-stage extraction lye solution is 10%, the ...

Embodiment 3

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

[0043] (1) After the pineapple pomace is crushed to 40 meshes, the delignification pretreatment is carried out at 70° C. for 3h with a sodium chlorite solution whose mass fraction is 10%, and the mass volume ratio of the pineapple pomace 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 by using the NaOH aqueous solution fractional extraction method, and the fractional extraction method is divided into three-level extraction, the first-level extraction lye mass concentration is 2%, and the second-level extraction lye solution is 2%. The mass concentration is 5%, the mass concentration of the three-stage extraction lye solution is 10%, the mass volume ra...

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Abstract

The invention belongs to the technical field of high polymer materials and discloses pineapple waste hemicellulose based pH sensitive type porous hydrogel as well as a preparation method and an application thereof. The method comprises steps as follows: pineapple waste is preprocessed firstly, hemicellulose in the preprocessed pineapple waste is extracted with a classification extraction method through alkali liquor, washed and subjected to freeze drying, and hemicellulose is obtained; the hemicellulose is dissolved in deionized water, a pore-forming agent is added, the mixture is heated and stirred to be uniformly mixed and completely dissolved, and a solution I is obtained; monomers and an initiator are added to the solution I, the solution I is stirred continuously, then a cross-linking agent is added, and the solution I is stirred until a system is completely dissolved and the solution is in a clear and transparent state, the solution is left to stand, soaked, washed and subjected to freeze drying, and the pineapple waste hemicellulose based pH sensitive type porous hydrogel is obtained. The preparation method is simple, and raw materials have abundant sources; the prepared porous hydrogel has controllable aperture, excellent texture characteristics, mechanical characteristics and pH sensitivity and can be applied to the fields of medicine and adsorption.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and particularly relates to a pineapple pomace hemicellulose-based pH-sensitive porous hydrogel and a preparation method and application thereof. Background technique [0002] Pineapple pomace, as the main waste produced in pineapple processing, 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 pomace contains a large amount of hemicellulose, which provides a possible direction for the deep processing and comprehensive utilization of pineapple pomace. 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 a lot of Active hydroxyl groups provide a basis for the modification of hemicellulose, thereby...

Claims

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Application Information

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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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