首页> 外文期刊>Journal of Applied Polymer Science >METAL-CHELATING PROPERTIES AND BIODEGRADABILITY OF AN ETHYLENEDIAMINETETRAACETIC ACID DIANHYDRIDE MODIFIED SOY PROTEIN HYDROGEL
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METAL-CHELATING PROPERTIES AND BIODEGRADABILITY OF AN ETHYLENEDIAMINETETRAACETIC ACID DIANHYDRIDE MODIFIED SOY PROTEIN HYDROGEL

机译:乙二酰胺乙酸二酐改性大豆蛋白水合物的金属螯合性能和生物降解性

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摘要

The heavy-metal chelating properties of a soy protein based hydrogel, prepared by crosslinking an ethylenediaminetetraacetic acid dianhydride (EDTAD) modified soy protein isolate (SPI), have been studied. The equilibrium binding capacities of the divalent calcium, zinc, mercury, and lead ions by the gel were 0.70, 0.65, 0.95, and 0.70 mmol per gram of dry gel, respectively. The distribution ratio of metal ions between the gel and the solution was in the range of 370 to 15,000 mL/g, depending on the initial metal concentration. A positive relationship between the carboxyl group content of EDTAD-modified SPI and the metal-binding ability of the gel was observed; the optimum metal binding occurred at 25 degrees C. The metal-binding ability increased with increasing pH, in the range where the solubility of the metal ions was not affected by the pH. In binary metal ion solutions, the metal ions adsorbed to the gel in a competitive fashion, influenced by the initial ion concentration. The EDTAD-modified protein hydrogel was readily degraded by proteolytic enzymes and was biodegraded in a fungal overgrowth test. The EDTAD-SPI hydrogel was completely degraded after a 28-day incubation with fungal spores. (C) 1997 John Wiley & Sons, Inc. [References: 20]
机译:已经研究了通过交联乙二胺四乙酸二酐(EDTAD)改性大豆分离蛋白(SPI)制备的大豆蛋白基水凝胶的重金属螯合性能。凝胶对二价钙,锌,汞和铅离子的平衡结合能力分别为每克干凝胶0.70、0.65、0.95和0.70 mmol。取决于初始金属浓度,凝胶和溶液之间金属离子的分配比在370至15,000 mL / g的范围内。观察到EDTAD修饰的SPI的羧基含量与凝胶的金属结合能力之间呈正相关。最佳的金属结合发生在25摄氏度。金属结合能力随pH的增加而增加,在此范围内金属离子的溶解度不受pH的影响。在二元金属离子溶液中,金属离子以竞争方式吸附到凝胶上,受初始离子浓度的影响。 EDTAD修饰的蛋白质水凝胶很容易被蛋白水解酶降解,并在真菌过度生长试验中被生物降解。与真菌孢子孵育28天后,EDTAD-SPI水凝胶完全降解。 (C)1997 John Wiley&Sons,Inc. [参考:20]

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