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| 1 | Quality analysis of commercial samples of Ziziphi spinosae semen(suanzaoren) by means of chromatographic fingerprinting assisted by principal component analysis显示文摘Due to the scarcity of resources of Ziziphi spinosae semen(ZSS), many inferior goods and even adulterants are generally found in medicine markets. To strengthen the quality control, HPLC fingerprint common pattern established in this paper showed three main bioactive compounds in one chromatogram simultaneously. Principal component analysis based on DAD signals could discriminate adulterants and inferiorities. Principal component analysis indicated that all samples could be mainly regrouped into two main clusters according to the first principal component(PC1, redefined as Vicenin II)and the second principal component(PC2, redefined as zizyphusine). PC1 and PC2 could explain 91.42%of the variance. Content of zizyphusine fluctuated more greatly than that of spinosin, and this result was also confirmed by the HPTLC result. Samples with low content of jujubosides and two common adulterants could not be used equivalently with authenticated ones in clinic, while one reference standard extract could substitute the crude drug in pharmaceutical production. Giving special consideration to the well-known bioactive saponins but with low response by end absorption, a fast and cheap HPTLC methodfor quality control of ZSS was developed and the result obtained was commensurate well with that of HPLC analysis. Samples having similar fingerprints to HPTLC common pattern targeting at saponins could be regarded as authenticated ones. This work provided a faster and cheaper way for quality control of ZSS and laid foundation for establishing a more effective quality control method for ZSS. | Shuai Sun Hailing Liu Shunjun Xu Yuzhen Yan Peishan Xie | 2014 | Journal of Pharmaceutical Analysis2014，4，3： | 17 |
| 2 | Theoretical analysis of the limiting rate of phreatic evaporation for aeolian sandy soil in Taklimakan Desert显示文摘Phreatic evaporation is a great lose for shallow groundwater in the Taklimakan Desert. Given soil type and groundwater table, the limiting rate of phreatic evaporation is defined as the maximum of water transferred from groundwater to soil surface per unit time, which is a key parameter and control condition for phreatic evaporation model developing. The soil water characteristic curve for the aeolian sandy soil in the Taklimakan Desert was fitted with the least square method based on the formula of soil moisture characteristics curve proposed by Van Genuchten, using observed soil moisture and soil water suction data. The unsaturated hydraulic conductivity was determined by the instantaneous profile method in situ and the calculation formula for unsaturated hydraulic conductivity was established. According to the steady flow theory, the quasi-analytical solution of limiting rate of phreatic evaporation was derived on the basis of generalization of the formula of unsaturated hydraulic conductivity. The results show that the soil moisture characteristics in the Taklimakan Desert can be well described by Van Genuchten’s formula, and the limiting rate of phreatic evaporation declines by power function with the descending of groundwater table. | HU ShunJun LEI JiaQiang XU XinWen SONG YuDong TIAN ChangYan CHEN XiaoBin LI XiuChang | 2008 | Chinese Science Bulletin2008，53，S2： | 2 |
| 3 | Simultaneous determina- tion of paeoniflorin, albiflorin and benzoylpaeoniflorin in Paeonia Radix Alba by TLC显示文摘 | XU Shunjun YANG Liu LIN QiaoUng | 2008 | Chromatographia2008，68，56： | 1 |
| 4 | Species differentiation andquality assessment of Radix Paeoniae Rubra(Chi-shao)by means ofhigh-performance liquid chromatographic fingerprint显示文摘 | XU Shunjun LIU Yang TIAN Runtao | 2009 | Journal of Chro-matography A2009，1216，11： | 1 |
| 5 | Base-controlled annulation of tryptamine-derived isocyanides with nitrile imines for access to polycyclic spiroindoline derivatives显示文摘An annulation reaction of tryptamine-derived isocyanides with hydrazonyl chlorides in the presence of bases was developed.Controlled by different bases,[1+2+3]annulation and[1+2+3]/[2+3]annulation cascade were realized.In the latter reaction,five new chemical bonds as well as three new heterocycles were formed in one step.It showed extremely high efficiency,relatively broad substrate scope,milder reaction conditions,good tolerance of functional groups and good chemoselectivity. | Xiaofeng Wang Luorong Yuan Xiaoping Xu Shunjun Ji | 2023 | Green Synthesis and Catalysis2023，4，2： | 0 |
| 6 | Etherification of Ferrocenyl Alcohol by Highly-efficient Ytterbium Triflate显示文摘有各种各样的脂肪族的白酒的 ferrocenyl 白酒的亲核的替换面对镱 triflate 的催化数量[Yb (OTf ) 3 ] 被学习。它被发现不对称的 ferrocenyl 醚当反应在主要、第二等的白酒被执行时,能容易在优秀收益被获得。在象 acetonitrile 那样的另外的器官的非酒精的溶剂,然而,对称的 ferrocenyl 醚而非不对称的形成被观察。 | Jiang, Ran Shen, Yechen Zhang, Ying Xu, Xiaoping Shao, Jinjun Ji, Shunjun | 2011 | Chinese Journal of Chemistry2011，29，9： | 0 |
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