目的：比较鲜、干药材中去甲肾上腺素和多巴胺的含量差异。方法：采用HPLC-UV测定马齿苋中去甲肾上腺素和多巴胺含量,流动相甲醇-水[70∶30,含30 mmol·L^-1十二烷基硫酸钠和0.02 mol·L^-1磷酸盐缓冲液（p H 3.2）],流速0.8 m ...目的：比较鲜、干药材中去甲肾上腺素和多巴胺的含量差异。方法：采用HPLC-UV测定马齿苋中去甲肾上腺素和多巴胺含量,流动相甲醇-水[70∶30,含30 mmol·L^-1十二烷基硫酸钠和0.02 mol·L^-1磷酸盐缓冲液（p H 3.2）],流速0.8 m L·min-1,检测波长280 nm。结果：HPLC中去甲肾上腺素和多巴胺的分离度很好,二者线性范围分别为52.5~157.5,64.7~194.1 mg·L^-1。鲜马齿苋中去甲肾上腺素和多巴胺质量分数分别为0.070%和0.50%,二者在干品中质量分数分别为0.015%和0.20%。结论：鲜药材中去甲肾上腺素和多巴胺含量明显高于干药材,可为马齿苋的合理使用提供实验依据。展开更多
Freeze drying or lyophilization of aqueous solutions is widely used in pharmaceutical industry. The in-creased importance Of the process is gaining a worldwide interest of research. A growing body of literature has de...Freeze drying or lyophilization of aqueous solutions is widely used in pharmaceutical industry. The in-creased importance Of the process is gaining a worldwide interest of research. A growing body of literature has demonstrated that the scientific approach can result in improved product quality with minimum trial and error em-piricism. Formulation and process development need a systematical understanding of the physical chemistry of freezing and freeze drying, material science and mechanisms of heat and mass transfer. This paper presents an overview on freeze ding of aqueous solutions based on publications in the past few decades. The important issuesof the process are analyzed.展开更多
文摘目的：比较鲜、干药材中去甲肾上腺素和多巴胺的含量差异。方法：采用HPLC-UV测定马齿苋中去甲肾上腺素和多巴胺含量,流动相甲醇-水[70∶30,含30 mmol·L^-1十二烷基硫酸钠和0.02 mol·L^-1磷酸盐缓冲液（p H 3.2）],流速0.8 m L·min-1,检测波长280 nm。结果：HPLC中去甲肾上腺素和多巴胺的分离度很好,二者线性范围分别为52.5~157.5,64.7~194.1 mg·L^-1。鲜马齿苋中去甲肾上腺素和多巴胺质量分数分别为0.070%和0.50%,二者在干品中质量分数分别为0.015%和0.20%。结论：鲜药材中去甲肾上腺素和多巴胺含量明显高于干药材,可为马齿苋的合理使用提供实验依据。
基金Supported by the National Natural Science Foundation of China(21076042)Research Grants Council of Hong Kong SAR (RGC 600704)
文摘Freeze drying or lyophilization of aqueous solutions is widely used in pharmaceutical industry. The in-creased importance Of the process is gaining a worldwide interest of research. A growing body of literature has demonstrated that the scientific approach can result in improved product quality with minimum trial and error em-piricism. Formulation and process development need a systematical understanding of the physical chemistry of freezing and freeze drying, material science and mechanisms of heat and mass transfer. This paper presents an overview on freeze ding of aqueous solutions based on publications in the past few decades. The important issuesof the process are analyzed.
