共查询到20条相似文献,搜索用时 109 毫秒
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分别采用常规提取法和超声波提取法对千日红色素的提取条件进行了探讨.结果表明,常规提取的最佳工艺条件是:以体积分数为10%的乙醇为浸提剂,按每克干燥花瓣加浸提剂80mL的比例投料,在温度40℃下,浸提时间为4h.超声波提取的最佳工艺条件是:以体积分数为20%的乙醇为浸提剂,按每克干燥花瓣加浸提剂80mL的比例投料,于超声波清洗器浸提50min.与常规提取法相比,超声波提取千日红色素的每次提取时间由4h减小为50min. 相似文献
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研究并优化了红心萝卜色素的提取条件.结果表明影响红心萝卜色素提取的因素依次是液固比、酸度、浸提时间、浸提温度.液固比5:1,浸提时间2 h,浸提温度50℃,浸提剂酸度为pH 2是提取红心萝卜色素的最佳条件. 相似文献
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桑叶叶蛋白提取工艺的研究 总被引:6,自引:0,他引:6
对桑树叶蛋白提取条件的优化进行了研究。结果表明,桑树叶蛋白提取的优化工艺条件为:室温下,以水为浸提荆,打浆时间3min,浸提时间4min,料液比1:5(叶片重比浸提剂体积,即g:m1),漫挺剂pH值8.0,絮凝温度75℃,调节提取液pH为5.0、8.0和13.0得到沉淀物,在60℃干燥。该工艺提取桑树鲜叶叶蛋白得率为:5.17%。 相似文献
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G Aravantinos-Zafiris V Oreopoulou C Tzia C D Thomopoulos 《Journal of the science of food and agriculture》1992,59(1):77-79
Carotenoids were extracted from fresh orange peel with various solvents. Acetone was the most efficient of the solvents tested. Two successive extractions with acetone after an initial washing with either acetone or methanol were adequate to remove 89% of the total carotenoids. The extracts were concentrated, the carotenoids transferred to hexane and a crude pigment concentrate was obtained by hexane evaporation. Water washings prior to acetone extraction eliminated the solvent-solvent transfer to hexane. The extraction residue was used for pectin recovery. Carotenoid removal from the peel did not affect the yield and quality of the pectin. 相似文献
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SUMMARY— Colored fractions ware extracted and concentrated from peel of most commercial orange varieties and used to enhance the color of orange juice products. These included Pineapple, Hamlin, Parson Brown, Valencia, blood orange and Dancy tangerine. The relative yields of crude pigment per kg of peel were compared between he different varieties. The color extracts were analyzed for tristimulus yellowness (Y) and redness (RI factors. Crude pigment yields ranged from .34 g (Hamlin) to 1.29 g (Dancy tangerine) per kg of peel. R factors were highest for Dancy tangerine, followed by Pineapple orange and Valencia, and lowest for Hamlin. Y factors were highest for Dancy tangerine, followed by Valencia and Pineapple and lowest for Hamlin. Most color extracts were effective at a dilution of 113500 parts in improving the color of orange juice products. 相似文献
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利用双水相系统同时分离火龙果皮中的天然红色素和果胶,提高火龙果皮资源的利用。以火龙果皮为原料,采用PEG/硫酸铵双水相体系分离火龙果皮中的色素和果胶。分析PEG相对分子质量、PEG质量分数、体系pH、硫酸盐质量分数4个因素对色素与果胶分离的影响。结果表明,随着双水相PEG和盐的质量分数增加,火龙果皮中的色素和果胶得率随之增加;当相比接近0.5时,上相中色素和下相中果胶获得较佳的分离。最佳的双水相分离条件为:利用质量分数16%的PEG6000,质量分数19%硫酸铵双水相体系,pH4.0,在此条件下,富集在上相的红色素和下相的果胶得率分别为1.82%±0.04%、3.68%±0.13%。因而,采用双水相萃取技术不仅可以同时分离火龙果皮中色素和果胶,还具有萃取条件温和、工艺简单、得率高的优点,本研究为火龙果皮的综合利用和开发提供了实验依据。 相似文献
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采用超声波辅助提取桔皮中的叶黄素,通过单因素试验和L9(3)3正交试验得出桔皮中叶黄素提取与溶剂种类、超声温度、超声时间、料液比之间的关系,并通过可见光光度计对其进行了表征研究。结果表明:以丙酮为提取溶剂,料液比为1 g∶25 mL,超声波提取15 min,超声波温度25℃,是从柑桔皮中提取叶黄素的最佳技术工艺条件。 相似文献
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为了确定从甜橙果皮中提取橙皮苷的高效方法,比较了索氏法和超声波辅助提取的效果。考虑到不同提取条件,即溶剂浓度、液固比、提取时间、提取次数和超声波功率的影响,采用单因素及正交设计比较这两种方法提取橙皮苷的效果,并用RP-HPLC法测定提取液中橙皮苷的含量。结果表明,超声波法辅助提取3个甜橙品种果皮中橙皮苷的平均含量高于索氏提取法的26.5%~34.6%,用这两种方法提取橙皮苷的数量达到统计学上的显著差异。超声波辅助提取法能真实地反映甜橙果皮中橙皮苷的含量,具有操作简便、省时的优点。建议柑橘果实橙皮苷的测定和提取可采用超声波辅助法。 相似文献