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酶法辅助提取紫苏中迷迭香酸条件的研究 总被引:1,自引:0,他引:1
紫苏是一种在我国广泛分布的唇形科植物,含有多种具有生理活性的化学成分,其中的迷迭香酸是一种含量较高的具有多种生理活性的水溶性酚类化合物。本文对从紫苏中酶法辅助提取迷迭香酸的条件进行了研究。主要研究了加酶量、料液比、提取温度、酶反应时间、粉碎度、溶剂pH对迷迭香酸得率的影响,并用正交实验L9(34)优化,高效液相色谱法测定迷迭香酸得率,确定最佳工艺条件为:加酶量为25U/g紫苏,料液比为1∶40(w/v),提取温度为50℃,酶反应时间为5min,迷迭香酸的得率为0.625%,比热水浸提法提高26.26%。此方法简单易行,是一种从紫苏中提取迷迭香酸的新型工艺,迷迭香酸的得率较高,生产成本较低,且更为绿色环保,可用于工业化生产。 相似文献
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为了使紫苏精油的色香味和生物活性更持久,本研究以辛烯基琥珀酸淀粉酯为壁材,紫苏精油为芯材,通过喷雾干燥的方式制备紫苏精油微囊粉。研究精油纯度、壁材质量分数、壁芯比及均质时间对紫苏精油包埋率的影响,并在单因素实验的基础上,采用Box-Behnken中心组合设计和响应面法对紫苏精油微囊粉制备工艺进行优化,建立了二次多项式回归方程的预测模型。研究结果表明,紫苏精油微囊粉最佳制备工艺条件为:紫苏精油纯度81%,壁材质量分数20%,壁芯比3:1,该条件下包埋率为80.19%。喷雾干燥法制备的紫苏精油微囊粉包埋率高,操作简单方便,适宜规模化生产。 相似文献
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超级甜味剂紫苏葶的合成 总被引:7,自引:0,他引:7
用亚硫酸氢钠加成—碱分解法从含醛量为4787%的紫苏油中提取得纯度为965%~97.0%的紫苏醛,提取率达96%。以此紫苏醛为原料,通过肟化反应合成了超级甜味剂紫苏葶。合成反应的产率最低为754%,最高为805%,平均产率为777%。合成工艺的最佳条件是:紫苏醛和羟胺的投料质量比为20∶9,反应温度50℃,反应时间2h。产物经后处理及转化后纯度不低于98%,其中顺式肟含量低于1%,产品甜度为蔗糖的2000倍。 相似文献
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Mengcheng Ruan Zhe Zhang Xuemei Yuan Ruijie Zhou Shijie Zhang Yu Tian Xueyin Li Na Li Zhiguo Liu Rui Zhu Hualin Wang 《International Journal of Food Science & Technology》2023,58(1):37-44
Vegetable oils rich in PUFAs are widely used in daily cooking and food industry, and PUFAs could be utilised by gut microbiota and present prebiotic effects. However, PUFAs are unstable in high-temperature cooking like frying. In the current study, we aimed to explore the influence of thermally oxidised oils rich in PUFA on gut microbiota. Two vegetable oils: omega-3 alpha-linolenic acid (ALA)-rich perilla oil or omega-6 linoleic acid-rich sunflower oil were heated at 180 °C for 10 h, and then fed to male SD rats for 14 weeks. Administration of heated perilla oil dramatically increased the relative abundance of Akkermansia muciniphila, a recent identified probiotics which may weaken intestinal mucus barrier, and inhibited the expression of several tight junction-related genes including occludin and claudin-1 in colon. Consumption of thermally oxidised sunflower oil stimulated the proliferation of Bifidobacterium. Our findings suggested that thermally processing has complicated effects on the prebiotic effects of vegetable oils rich in PUFAs, and perilla oil fried foods may be potential sources to stimulate Akkermansia proliferation in gut. 相似文献