Swelling behavior of cross-linked carboxyl propionylated soybean protein isolate hydrogel
首发时间:2008-03-12
Abstract:In this paper, the hydrogel based on carboxyl propionylated soybean protein isolate (CPSPI) was prepared from soybean protein isolate (SPI) with succinic anhydride (SA) and glutaraldehyde. The carboxyl group, solubility and isoelectric point (IEP) of CPSPI were determined by the conductivity method and ultraviolet-visible light spectra. The swelling ratio (SR) of the cross-linked CPSPI hydrogel (cr-CPSPI) was mensurated in different pH value and ionic strength. The results showed that the solubility of CPSPI was much higher than SPI with SA/SPI (w/w) in neutral and alkaline aqueous medium. The number of moles of dissociative carboxyl groups per mole of CPSPI (Cn, mol/mol) is larger than SPI. The IEP of CPSPI decreased from 4.50 to 3.16 with the SA/SPI increasing. The swelling behavior of cr-CPSPI hydrogel is different in acidic, alkaline and NaCl solutions.
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羧基丙酰化大豆分离蛋白交联聚合物水凝胶的溶胀特性
摘要:本文采用大豆分离蛋白(SPI)与丁二酸酐(SA)及戊二醛等为原料分别制备了羧基丙酰化大豆分离蛋白(CPSPI)及其交联聚合物水凝胶。采用电导率法和紫外等测定了CPSPI的羧基含量、溶解性和等电点;测定了交联的羧基酰化大豆分离蛋白(cr-CPSPI)水凝胶在不同pH值和离子强度条件下的溶胀比。结果表明,在中性和碱性介质中CPSPI的溶解性随SA用量增加而提高;游离的羧基含量也高于SPI。CPSPI的等电点随SA用量增加由 4.50 降至 3.16。羧基丙酰化大豆分离蛋白交联聚合物水凝胶(cr-CPSPI)在酸性、碱性和盐介质中表现出不同的溶胀行为。
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No.1922520393112052****
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