响应面优化桂花糯米藕复合糖液配方的研究

为了生产出风味优良,香、甜、糯、可口的适合工业化生产的优质桂花糯米藕,以白砂糖、香兰素、柠檬酸和桂花卤作为原料,研究了桂花糯米藕复合糖液组成.在单因素试验基础上,通过响应面分析法对糖液组成进行优化,确定最佳糖煮时间,提高了产品口感质量.结果表明,复合糖液的最佳配方为:白砂糖30.61%、香兰素0.02%、柠檬酸0.11%和桂花卤0.3%,最佳糖煮时间为90 min.响应面法对桂花糯米藕复合糖液配方优化合理可行,可提高桂花糯米藕的感官品质.

Adsorption of Chromium （Ⅵ） from Aqueous Solution Using Zeolite/Chitosan Hybrid Composite

This study investigated the adsorption ability of ZCHC （zeolite/chitosan hybrid composite） as adsorbent for chromium （Cr（Ⅵ））, ZCHC was prepared with sol-gel method by mixing zeolite and chitosan. Adsorption experiment from aqueous solutions containing known amount of Cr（Ⅵ） using zeolite, chitosan and ZCHC was explored to evaluate the efficiency of ZCHC as adsorbent for Cr in a batch system. The amount of Cr（Ⅵ） adsorbed at different pH values, initial concentrations, adsorbent dosages, and contact times were determined by ICP-AES （inductively coupled plasma-atomic emission spectrometry） in order to determine the optimum conditions for Cr（Ⅵ） adsorption. Furthermore, the adsorption mechanism of Cr（Ⅵ） by zeolite, chitosan and ZCHC was investigated by applying Langmuir and Freundlich isotherm equations to the data obtained. In addition, the rates of adsorption were found to conform to pseudo-second order kinetics.