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磺胺二甲嘧啶中4-氨基苯酚杂质的HPLC检测方法 总被引:2,自引:0,他引:2
建立了高效液相色谱测定磺胺二甲嘧啶药物中4-氨基苯酚杂质的分析方法,严格按照美国药典USP29<1225>、人用药品注册技术国际协调会议指导文件ICH Q2A和ICH Q2B对方法进行了验证.色谱柱采用Phenomenex LunaC18(4.6×250 mm,5 μm)反相色谱柱,流动相为V(Na2HPO4(8.95 g/L)):V(NaH4PO4(3.90 g/L)):V(甲醇)=3:3:2,检测波长为235nm.当4-氨基苯酚的浓度在0.05~1.00μg/mL时,色谱峰面积与浓度呈良好的线性关系,线性相关系数R=0.9993.方法的检出限为2.0 mg/kg,定量限为5.0 mg/k.方法的准确度、精密度和专属性均满足USP29<1225>、ICH Q2A和ICH Q2B的要求.将方法用于实际磺胺二甲嘧啶原料药检测,结果未检出含有4-氨基苯酚.本方法适合于磺胺二甲嘧啶及类似药物中4-氨基苯酚杂质的检测. 相似文献
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Charge noise acting on graphene double quantum dots in circuit quantum electrodynamics architecture 下载免费PDF全文
We investigate the dephasing mechanisms induced by the charge noise and microwave heating effect acting on a graphene double quantum dot(DQD) capacitively coupled to a microwave resonator. The charge noise is obtained from DC transport current, and its contribution to dephasing is simultaneously determined by the amplitude response of the microwave resonator. A lowfrequency 1/f-type noise is demonstrated to be the dominant factor of the dephasing of graphene DQD. Furthermore, when the applied microwave power is larger than-90 d Bm, the dephasing rate of graphene DQD increases rapidly with the increase of microwave power, and fluctuates slightly with the applied microwave power smaller than-90 d Bm. Our results can be applied to suppress the impeditive influence on the dephasing of graphene-based devices associated with microwave input in the perspective investigations. 相似文献
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