A simple and sensitive strategy using cyclodextrin-modified micellar electrokinetic chromatography with diode array detector was developed and applied for the simultaneous separation and determination of nine components in Sanyetangzhiqing (SYTZQ), a hypoglycemic and hypolipidemic agent. Several important parameters affecting separation performance were evaluated and optimized using single variable methods. Under the optimal conditions, baseline separation of the nine components, including four flavonoids (hyperoside, isoquercitrin, quercetin-3-O-glucuronoside, and astragalin), four phenolic acids (chlorogenic acid, rosmarinic acid, salvianolic acid B, and lithospermic acid), and a monoterpenoids (paeoniflorin), were achieved in less than 16 min. The correlation coefficients of the calibration curves were over 0.9996 for all the analytes. Intraday and interday precisions ranged from 0.4% to 4.8% and 1.7% to 5.0%, respectively. Recoveries of analytes varied from 95.3% to 105%. Validation results as well as the application to analyse SYTZQ samples demonstrated the applicability of the proposed method and thus provided an effective tool for the quality control of SYTZQ. Moreover, with the advantages of short time consuming, low energy consumption, high efficiency, and low cost, this method has laid a foundation for the determination and quality evaluation of multicomponents in Chinese herbal compounds.
Carbon nanotube (CNT) is an excellent field while for microwave devices a much larger current density emitter due to its small diameter (1-40 nm), high aspect ratio (> lA/cm2) is preferred.(>103), and high theoretical current limit (-1jA / SWNT).
Methods for assembling and integrating SWNTs orThe applications like CNT-FED or 11PM require uniform MWNTs onto a device surface to form a cathode include distribution of field emission current, low turn-on field, and high current density. However, macroscopic cathodes made plasma enhanced chemical vapor deposition (PECVD) [4], from CNTs for CNT-FED and microwave devices have been p shown to exhibit low emission site density (103-104 sites/cm2) water assisted CVD [5], electrophoresis deposition [6], compared to CNT density (109-101o /cm2 ), non-uniformity in spray coating of CNT mixture [7], and screen printing from emission sites distribution, and lower current density a paste mixture of CNTs [8]. Thermal CVD or PECVD achievable than dispenser cathode. The non-uniformity of can grow CNTs directly inside a 30 ,um hole, but the emission sites distribution is closely related to field screening length and uniformity across a panel size area is difficult to effect at individual sites. Only the CNTs with the highest achieve. Screen printing is a cost effective method, but the local electric field can emit current. The effect of field resolution of an ordinary screen is usually larger than 200,um enhancement factor, which is a strong function of local microstructure and a result of manufacture method, is found and
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