共查询到19条相似文献,搜索用时 62 毫秒
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HPLC法测定灯盏花素胶囊中野黄芩苷的含量 总被引:1,自引:0,他引:1
建立了灯盏花素胶囊中野黄芩苷的含量的测定方法。采用HPLC测定胶囊中野黄芩苷的含量,C18色谱柱(4.6 mm×250 mm,5μm),柱温40℃,进样量20 uL,流动相:甲醇-0.1%磷酸(40∶60),流速1.0 mL/min,检测波长:335 nm。野黄芩苷在20~160μg/mL范围内,进样量与峰面积积分值之间线性关系良好,平均回收率为99.1%,RSD为0.46%。本方法操作快速简单,准确可靠,可用于灯盏花素片的含量测定和质量控制。 相似文献
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四乙酰乙二胺的合成研究 总被引:12,自引:0,他引:12
以乙二胺、乙酸、乙酸酐为原料,在同一反应釜内,采用两步法合成四乙酰乙二胺。结果表明,当n(乙二胺)∶n(乙酸)∶n(乙酸酐)=1∶25∶4,反应温度为120℃(第一步)和140℃(第二步),反应时间为9~10h时,产品产率可达75%。 相似文献
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漂白活化剂四乙酰乙二胺的制备 总被引:3,自引:0,他引:3
本文论述了以乙二胺、乙酸和乙酸酐为原料,采用两步同釜连续制备工艺,分别在120℃和140℃温度下,制备漂白活化剂四乙酰乙二胺(TAED)的方法 相似文献
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Qian LH Li NG Tang YP Zhang L Tang H Wang ZJ Liu L Song SL Guo JM Ding AW 《International journal of molecular sciences》2011,12(11):8208-8216
Scutellarein, the main metabolite of scutellarin in vivo, has relatively better solubility, bioavailability and bio-activity than scutellarin. However, it is very difficult to obtain scutellarein in nature compared with scutellarin. Therefore, the present study focused on establishing an efficient route for the synthesis of scutellarein by hydrolyzing scutellarin. The in vitro antioxidant activities of scutellarein were evaluated by measuring its scavenging capacities toward DPPH, ABTS+•, •OH free radicals and its protective effect on H2O2-induced cytotoxicity in PC12 cells using MTT assay method. The results showed that essential point to the synthesis was the implementation of H2SO4 in 90% ethanol in N2 atmosphere; scutellarein had stronger antioxidant activity than scutellarin. The results have laid the foundation for further research and the development of scutellarein as a promising candidate for ischemic cerebrovascular disease. 相似文献
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Hang Lin Wei Zhang Ze-Xi Dong Ting Gu Nian-Guang Li Zhi-Hao Shi Jun Kai Cheng Qu Guan-Xiong Shang Yu-Ping Tang Fang Fang He-Min Li Jian-Ping Yang Jin-Ao Duan 《International journal of molecular sciences》2015,16(4):7587-7594
Scutellarin (1) has been used for the treatment of angina pectoris, cerebral infarction and coronary heart disease with a large market share in China. Pharmacokinetic studies on scutellarin showed that scutellarin (1) is readily converted into its metabolites in vivo. In this paper, a new and practical synthetic method for the synthesis of 6-O-methyl-scutellarein (3) (one metabolite of scutellarin in vivo) is reported. The benzyl bromide was firstly used to selectively replace the acetyl group at C-7 in 7, and was then used to protect the hydroxy groups at C-4'' in 10, 6-O-methyl-scutellarein (3) is obtained in high yield through these methods. 相似文献
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《分离科学与技术》2012,47(5):1250-1260
Abstract A low-temperature, timesaving, lower solvent consumption, and energy cost and multi-stage countercurrent extraction (MCCE) technique was developed for pilot-scale production of scutellarein from Erigeron breviscapus (Vant.) Hand-Mazz. The optimum conditions of MCCE process were obtained using the orthogonal array design method, i.e., 70% (v/v) of ethanol water solution, 16 L/kg of solvent to herbal sample ratio, 45°C of extraction temperature and 30 min of extraction time. A comparison between the MCCE technique and single pot extraction (SPE) under respective optimized operation conditions was made and time courses of scutellarein of MCCE and SPE processes were plotted, indicating that the MCCE technique can lower the extraction temperature and decrease five-sixth of the extraction time and two-thirds of the solvent consumption at the equivalent extraction yield of scutellarein. 相似文献
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Sang Eun Ha Seong Min Kim Preethi Vetrivel Hun Hwan Kim Pritam Bhagwan Bhosale Jeong Doo Heo Ho Jeong Lee Gon Sup Kim 《International journal of molecular sciences》2021,22(16)
Scutellarein (SCU) is a well-known flavone with a broad range of biological activities against several cancers. Human hepatocellular carcinoma (HCC) is major cancer type due to its poor prognosis even after treatment with chemotherapeutic drugs, which causes a variety of side effects in patients. Therefore, efforts have been made to develop effective biomarkers in the treatment of HCC in order to improve therapeutic outcomes using natural based agents. The current study used SCU as a treatment approach against HCC using the HepG2 cell line. Based on the cell viability assessment up to a 200 μM concentration of SCU, three low-toxic concentrations of (25, 50, and 100) μM were adopted for further investigation. SCU induced cell cycle arrest at the G2/M phase and inhibited cell migration and proliferation in HepG2 cells in a dose-dependent manner. Furthermore, increased PTEN expression by SCU led to the subsequent downregulation of PI3K/Akt/NF-κB signaling pathway related proteins. In addition, SCU regulated the metastasis with EMT and migration-related proteins in HepG2 cells. In summary, SCU inhibits cell proliferation and metastasis in HepG2 cells through PI3K/Akt/NF-κB signaling by upregulation of PTEN, suggesting that SCU might be used as a potential agent for HCC therapy. 相似文献
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采用超声波处理多壁碳纳米管,配成修饰液后滴涂于玻碳电极表面制作成多壁碳纳米管修饰玻碳电极(MWNTs/GCE)。以循环伏安法研究了野黄芩苷在修饰电极上的电化学行为,建立了一种电化学检测野黄芩苷的新方法。结果表明,在最佳条件下,野黄芩苷在4.0×10-6~1.0×10-4mol.L-1浓度范围内与峰电流呈良好的线性关系,相关系数r=0.9991。方法检出限为8.2×10-7mol.L-1(S/N=3)。连续测定4.0×10-5mol.L-1的野黄芩苷溶液,RSD为1.8%(n=11)。该方法已成功地应用于注射液和片剂中野黄芩苷的测定。 相似文献