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A quartz crystal microbalance (QCM) is used to determine the phase equilibrium of paclitaxel-carbon dioxide system in the pressure range of 0-11 MPa and at temperatures of 35 °C,40 °C and 45 °C.The experimental results indicated that gaseous CO2 could be absorbed poorly into paclitaxel.The swelling of paclitaxel film in CO2 was observed before paclitaxel dissolved into supercritical carbon dioxide (ScCO2) with the increase of pressure.It was found that ScCO2 was not a good solvent for paclitaxel.The mole fraction of paclitaxel in ScCO2 was in the range of (4.5×10-9)-(7.8×10-9) under all our experimental conditions.Therefore,a much higher pressure than the CO2 supercritical point and/or a cosolvent must be used in any processes wherever paclitaxel dissolution in ScCO2 is required. 相似文献
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应用测试片快速检测食品中金黄色葡萄球菌的研究 总被引:1,自引:0,他引:1
采用法国进口的金黄色葡萄球菌显色培养基为主要原料,运用微生物测试片专有技术将其制成一次性的快速测试片.经测试,该测试片的检测灵敏度高,特异性强,重复性好.其对纯菌的检测下限可达3 cfu/mL.与营养琼脂计数、Baird-Parker培养基计数和显色培养基计数比较,检测结果均无显著性差异(P>0.05).对染菌样品的检测结果.测试片与3MTMPetrifilm法无显著性差异(P>0.05),而检测下限明显低于GB标准方法. 相似文献
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