A new compound, kudinoside LZ2 (1), was isolated from the leaves of llex kudincha. Its structure was elucidated by the combination of one- and two-dimensional NMR analysis, HR-ESI-MS, CD spectrum measurement and che...A new compound, kudinoside LZ2 (1), was isolated from the leaves of llex kudincha. Its structure was elucidated by the combination of one- and two-dimensional NMR analysis, HR-ESI-MS, CD spectrum measurement and chemical evidences.展开更多
Simultaneous distillation-extractor was used for extracting the volatile substances in Llex Kudincha.26 volatile components were identified by gas chromatography mass spectrometry (GC-MS)method.The identified compound...Simultaneous distillation-extractor was used for extracting the volatile substances in Llex Kudincha.26 volatile components were identified by gas chromatography mass spectrometry (GC-MS)method.The identified compounds are 94.83 % of the total volatile substances.展开更多
目的研究微波提取苦丁茶总黄酮的最佳提取条件。方法通过二次回归正交旋转组合试验设计,得到了微波提取苦丁茶中黄酮的数学回归方程;利用模型的响应曲面图及等高线图,对影响微波提取苦丁茶黄酮提取率的关键因素及相互作用进行探讨,得到...目的研究微波提取苦丁茶总黄酮的最佳提取条件。方法通过二次回归正交旋转组合试验设计,得到了微波提取苦丁茶中黄酮的数学回归方程;利用模型的响应曲面图及等高线图,对影响微波提取苦丁茶黄酮提取率的关键因素及相互作用进行探讨,得到最佳提取工艺条件。结果最佳提取工艺条件:乙醇浓度69%,微波功率782 W,萃取时间4.5 m in,料液比1∶15,苦丁茶黄酮提取率为9.10%。结论该工艺条件可为工业生产提供参考数据。展开更多
基金supported by Program for New Century Excellent Talents in University of People's Republic of China(No.NCET-04-0289)
文摘A new compound, kudinoside LZ2 (1), was isolated from the leaves of llex kudincha. Its structure was elucidated by the combination of one- and two-dimensional NMR analysis, HR-ESI-MS, CD spectrum measurement and chemical evidences.
文摘Simultaneous distillation-extractor was used for extracting the volatile substances in Llex Kudincha.26 volatile components were identified by gas chromatography mass spectrometry (GC-MS)method.The identified compounds are 94.83 % of the total volatile substances.
文摘目的研究微波提取苦丁茶总黄酮的最佳提取条件。方法通过二次回归正交旋转组合试验设计,得到了微波提取苦丁茶中黄酮的数学回归方程;利用模型的响应曲面图及等高线图,对影响微波提取苦丁茶黄酮提取率的关键因素及相互作用进行探讨,得到最佳提取工艺条件。结果最佳提取工艺条件:乙醇浓度69%,微波功率782 W,萃取时间4.5 m in,料液比1∶15,苦丁茶黄酮提取率为9.10%。结论该工艺条件可为工业生产提供参考数据。