佛手皮渣果胶的提取、改性及其对镉的吸附能力的研究
首发时间:2018-02-13
摘要:目的:研究超声辅助酸提佛手皮渣果胶工艺优化条件,分析改性对果胶化学性质和镉吸附能力的影响。方法:以佛手皮渣为原料,通过超声辅助酸提法提取佛手皮渣中的果胶成分,通过单因素实验和响应面试验对提取工艺进行优化,并与单一酸提取法获得的果胶的得率进行对比。另外,通过调节pH的方法对果胶进行改性,获得改性果胶。最后,通过动力学研究和热力学研究对果胶的镉吸附能力及吸附过程进行分析。结果:超声辅助能够显著提高酸提法佛手皮渣果胶的提取效率,最优提取条件如下:料液比1:60、提取温度70 C、超声功率350 w、pH为1.5,获得果胶得率为22.7%。改性佛手皮渣果胶的酯化度显著低于未改性果胶,其镉吸附能力也显著高于未改性果胶。佛手皮渣果胶吸附镉的过程主要涉及离子交换过程。结论:超声辅助能有效提高佛手皮渣果胶的提取效率,对果胶进行改性后能降低酯化度并提高果胶对镉的吸附能力。
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The Extraction and Modification of Finger Citron Pectin and Its Cadmium Capacity
Abstract:In this paper, the pectin in finger citron peel residue was extracted by ultrasonic assisted-acid extraction, and the extraction process was optimized by single factor experiment and response surface test. In addition, the pectin was modified by pH adjusting method. Finally, the cadmium adsorption capacity and adsorption process of pectin were analyzed by kinetic study and thermodynamics. The results showed the optimum extraction conditions as follows: using hydrochloric acid, the ratio of solid to liquid 1:60, the extraction temperature 70 C, the ultrasonic power 350 w, pH 1.5, the yield of finger citron peel residue pectin was 22.7%. The results suggest that ultrasonic-assisted process can effectively improve the acid extraction. The esterification degree of modified pectin was significantly lower than unmodified pectin. In addition, the modified pectin has stronger cadimium adsorption capacity than unmodified pectin. The process of the adsorption of cadmium by the pectin is mainly involved in the ion exchange process.
Keywords: Finger citron peel residue pectin Ultrasonic-assisted acid extraction Modified pectin Cadimium adsorption
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