响应面法优化虎杖中白藜芦醇提取工艺的研究

采用响应曲面法并通过单因素试验优化了由纤维素酶酶解提取虎杖中白藜芦醇的条件,所得的最佳工艺为酶用量2mg／g虎杖粉末、温度52．5℃、pH值4．5、酶解时间110min．该条件下每毫升提取液中白藜芦醇的浓度达到了1．489mg／mL,与模型预测值基本相符．     

青花椒保鲜技术的研究

对青花椒采摘后的实用保鲜技术进行了研究,且通过正交试验确定了最佳护绿处理方案和真空包装条件。试验结果表明：常温下,用0.2%柠檬酸、0.3%Vc溶液浸泡45 min,90℃烫漂1 min,抽真空时间25 s,热封时间3 s,热封温度200℃的条件下真空包装效果最好,常温下可保持8-10 d不变色,在4℃低温下可贮藏1个月不变色。     

响应面法优化榆黄蘑中多糖的提取工艺

实验以榆黄蘑为原料,用多糖提取率作为衡量提取工艺的指标,通过单因素实验分别探讨了料液比、提取温度、提取时间对榆黄蘑多糖提取率的影响,并采用蒽酮-硫酸法测定了糖的含量.利用Box-Benhnken中心组合设计原理和响应面分析法探讨榆黄蘑多糖的最佳热提工艺,结果表明最佳热提工艺的参数为:料液比为1:50,提取温度为90 ℃,提取时间为40 min.最佳热提工艺条件下的榆黄蘑多糖提取率为8.39%.     

柠条叶蛋白碱性提取的响应面分析法优化

柠条是一种粗蛋白含量较高的灌木,而且富含全部的人体必需氨基酸.从丰富的柠条资源中提取蛋白对于部分缓解我国目前的蛋白质资源紧缺以及环境保护等问题具有积极作用;因此,通过Box-Behnken实验设计进行柠条叶蛋白碱性提取的响应面优化,得到了适当的模型,并确定了重要参数的最佳水平.根据系统给定的参数得到的预测值与实测值相当接近;柠条叶蛋白提取的最佳工艺条件为：NaOH溶液浓度0.12,mol/L,絮凝pH,2.9,温度75,℃.最终可得柠条叶蛋白浓缩物相对得率（RLPCY）和蛋白相对得率（RPY）分别为16.2%和41.5%.     

Determination of contents of eight alkaloids in fruits of Macleaya cordata （Willd） R. Br. from different habitats and antioxidant activities of extracts

A reliable ultrasound-assisted extraction (UAE) method combined with HPLC-UV for quantification of eight active alkaloids in fruits of Macleaya cordata (Willd) R. Br. was developed. The optimization conditions of UAE were obtained by using Box-Behnken design of response surface methodology. Chromatography was carried out using a Kromasil C18 column by gradient elution with 0.1% phosphoric acid aqueous solution for HPLC-UV. All calibration curves showed good linear correlation coefficients (R2>0.999 6) and recoveries (from 97.3% to 104.9%) were acceptable. l,l-diphenyl-2-picrylhydrazyl (DPPH) method was employed to test the antioxidant activity of the extract from the samples. The proposed method was successfully applied to quantifying eight components in nine samples of M.cordata, and significant variations of alkaloid contents and antioxidant activity of the samples from different habitats were demonstrated. It presents a powerful proof for the selection of the best sources to extract eight kinds of alkaloids.     

多汁乳菇多糖的分离纯化及三种食用菌多糖的抗氧化研究

以多汁乳菇子实体为原料,采用水提醇沉辅助超声破碎提取多糖,经Sevage除蛋白得到多汁乳菇多糖,并通过体外实验比较多汁乳菇多糖(refined polysaccharide from Lactarius volemus Fr.,RPLV)、白玉菇多糖(refined polysaccharide from White Hypsizigus marmoreus,RPHM)、姬菇多糖(refined polysaccharide from Pleurotus cornucopiae,RPPC)对·OH、·O^-₂、DPPH自由基的清除率及还原力来评价三者的抗氧化活性. 结果显示,RPLV的糖含量为66.44%,蛋白质含量为3.57%; RPLV、RPHM、RPPC均可较好地清除·OH、·O^-₂、DPPH自由基、增强还原力,且均随着浓度的增加而增强; 抗氧化活性从强到弱依次是RPPC、RPHM、RPLV. 研究结果表明,3种食用菌多糖尤其是RPPC均有望开发成良好的天然抗氧化剂.