Adsorption material for coupling tannin on the surface of non-woven fabric and its preparation method

Abstract

The invention discloses a preparation method of a material for adsorbing tannin coupled on the surface of a non-woven fabric. The preparation method comprises the following steps of: grafting a carboxylic unsaturated monomer onto the surface of a non-woven base material by using an ultraviolet induction technology so as to introduce carboxyl; then carrying out catalytic condensation on diamine and carboxyl so as to introduce amido; converting the introduced amido into a Schiff base active intermediate product by using an aldehyde activation method to couple and immobilize the tannin on the surface of the non-woven fabric; and washing off the tannin which is not coupled and immobilized by using boiling water to prepare the material for adsorbing tannin coupled on the surface of the non-woven fabric. The adsorption material has better hydrophily, the water absorptivity of the adsorption material can exceed 1000 percent; the phenolic hydroxyl content and the water absorptivity of the adsorption material are extensively adjustable; the adsorption material has stronger adsorption capability on protein; and when the concentration of gelatin in an aqueous solution or model wine ranges from 100mg / L to 400mg / L, the equilibrium adsorption capacity of the adsorption material ranges from 14.7mg / g to 50.9mg / g and reaches adsorption equilibrium about 1 hour.

Description

technical field [0001] The invention relates to an adsorption material coupled with tannin on the surface of a non-woven fabric and a preparation method thereof, belonging to the field of adsorption and separation. Background technique [0002] Adsorption, separation and removal of proteins in water-based fluids Separation and removal of proteins in natural product extraction and deep processing, removal of turbid active proteins in plant-based beverages, and removal of turbidity by gelatin precipitation in alcohol and other beverage products The field of re-removal of remaining gelatin after active plant polyphenols has great practical value. [0003] First of all, the development of functional natural products is a very dynamic field. A large number of documents in the VIP database involve orange peel polysaccharides, crony polysaccharides, pumpkin water-soluble polysaccharides, oolong tea polysaccharides, purple mussel polysaccharides, purslane polysaccharides, and Osmant...

AI Technical Summary

Problems solved by technology

The first method uses silica hydrosol, silica dry sol, montmorillonite, etc. as adsorbents. Due to their poor adsorption selectivity, other active ingredients (such as flavor proteins, Foam and foam holding capacity protein and other active ingredients) and cause product loss, there are also problems of slow sedimentation, difficult filtration separation and low production efficiency and high production cost (Georg, Luer et al Beer clarification aid based on silica xerogel with high filterability US 2010 / 0112132A1); the second method uses silica dry sol / PVPP mixed adsorbent (Polycar Plus 730), which has better adsorption selectivity and can simultaneously remove turbid active proteins and turbid active plant polyphenols, but still There are problems with settling and separation difficulties (Chandra G et al, Brewer' Guardian sPVPP-the route to effective beer stabilization, May 2000:1-7; Mustafa R et al. Superior colloidal stabilization of beer by combined treatment with silica (xerogel) and PVPP, Polyclar plus 730, MBAA TQ, 2000, 37 (1): 113-118); the third method is to add tannic acid to beer to form a complex precipitation with turbid active protein, but the precipitate particles are fine , time-consuming and very difficult to filter, and excessive tannin residues in the wine body will introduce new turbid active plant polyphenols, which will also have adverse effects on its color, taste and aroma (Mustafa R et al A new direction in beer stabilization, Inst Brew Africa Sect, Proc 7 th Brewing convention)

The fourth method uses (immobilized) papain or proline-specific endonuclease to degrade the turbidity active protein to lose the turbidity activity (Mustafa R et al, Colloidal stabilization of beer, US 2003 / 0194477A1; Lopez; Michel, et al al.Method for the prevention or reduction of haze in beverages, US 8119171), but it will have a negative impact on the foaming and foam retention of beer

[0012]Aiming at the problems of adsorbents for immobilizing (chemically) tannins on solid particles and their application, another type of tannin immobilization (chemical) technology has been adjusted The form of immobilized carrier has changed the application method of immobilized (chemical) tannin. Chinese patent CN1305559C discloses a super-large-porous spherical cellulose immobilized (chemical) tannin adsorbent and its preparation method and application. This technology has a wide range of sources And the cellulose with a hydrophilic skeleton is used as the immobilization (chemical) carrier of tannin, and the obtained adsorbent can use the packed column process to treat wine and reduce its EBC turbidity and EBC chromaticity, and its turbidity and chromaticity reduction effect is better than that of The tannic acid precipitation method can maintain the foam retention and SASPL value of beer to the greatest extent, but the manufacturing process of macroporous spherical cellulose is complicated and the defects of cellulose's own mechanical strength and poor acid and alkali resistance are also obvious

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