Identification and determination of the major constituents in traditional Chinese medicine Longdan Xiegan Pill by HPLC-D

A novel and sensitive HPLC-UV method has been developed for the simultaneous determination of twelve major compounds in Longdan Xiegan Pill.The chemical profile of the twelve compounds,including geniposidic acid（1）,geniposide（2）,gentiopicroside（3）,liquiri     

Flow-injection-enhanced chemiluminescence method for the determination of three β-blockers

Objective To develop a rapid, simple and sensitive chemiluminescence method for the determination of three β-blockers (bisoprolol, atenolol and propranolol). Methods The chemiluminescence of cerium (Ⅳ)-sulfite system was obviously sensitized by adding anyone of three β-blockers in acid media. A new chemiluminescence method was set up by combining with flow-injection technique and used to determine the three β-blockers. Results Good linear ranges were obtained at the concentrations of 2.0×10-7g/mL-4.0×10-5g/mL, 1.0×10-7g/mL-3.0×10-5g/mL and 7.0×10-7g/mL-1.0×10-5g/mL, respectively, with the detection limits of 5.0×10-8g/mL, 7.0×10-8g/mL and 5.0×10-8g/mL (S/N=3), respectively, and the relative standard deviations for 11 times consecutive injections of 1.0×10-6g/mL bisoprolol, atenolol and propranolol were 3.57%, 2.21% and 2.26%, respectively. Conclusion The developed method is sensitive, accurate, rapid and of low cost. And it can be applied to determine bisoprolol, atenolol and propranolol in pharmaceutical preparations.     

混凝土结构无损检测系统iTECS应用研究

iTECS(Integrity Test Equipment for Concrete Structures)是一种多功能混凝土结构无损检测系统(见图1),可以同一时间、同一地点集成检测的主要项目有:结构物厚度的测定;测定应力波速度推算混凝土的抗压强度;裂缝深度的测定;     

乙烯基活性聚合物改性橡胶沥青的研究

采用活性乙烯基三元共聚物Elvaloy(R) 4170作为一种新的沥青改性剂,研究了其对沥青的结构和性能的影响.荧光显微镜观察表明:E1valoy(R) 4170的加入可显著改善胶粉在沥青中的分散状态；流变测试表明Elvaloy(R) 4170的加入可以改善沥青的粘弹性；当沥青、胶粉和Elvaloy(R) 4170的质...     

聚焦可持续发展:陶氏化学亮相2011中国国际涂料展

2011年11月23日-25日,陶氏涂料材料业务部参加了在上海新国际博览中心举行的第十六届中国国际涂料展,并推出了一系列新产品和新技术。陶氏微生物控制技术业务部新一代罐内防腐剂BIOBANTM 551S新一代罐内防腐剂产品BIOBANTM 551S采用了业务部最新研发的抗菌活性成分MBIT(2-甲基-1,2-苯并异噻唑-3-酮)。填补市场需求与技术空缺,在很大程度上改变杀菌剂的市场现状,积极应对和解决当前最为严峻的微生物污染问题。     

Simultaneous quantification of five major active components in capsules of the traditional Chinese medicine ＇Shu-Jin-Zhi-Tong＇ by high performance liquid chromatography

A simple and reliable high performance liquid chromatography （HPLC） method has been developed for the simultaneous quantification of five major bioactive components in ＇Shu-Jin- Zhi-Tong＇ capsules （SJZ...     

液、塑限联合测定法的研究

液、塑限联合测定法在其他国家已经得到广泛应用,国内尚未正式推广。但作为一种能最大限度消除人为因素影响的试验方法,有着很好的应用前景。本研究主要目的是分析不同性质土的液、塑限联合测定法与人工手搓法试验的对比结果,找出其相应的试验规律,并为该项试验方法在国内得到广泛应用提供参考。     

浅谈混凝土减水剂之减水率测定方法的实际应用

通过测定掺减水剂水泥净浆标准稠度的方法来计算减水剂的减水率,为按GB 8076-2008标准测定减水剂减水率提供一种简捷的估算依据,从而快速判断混凝土减水剂的减水率以及和水泥的适应性问题,较好地配合混凝土配合比设计,以降低做配合比时劳动强度。