Simultaneous Determination of 5 Components in the Classical Formula Huaihua San by HPLC Wavelength Switching Method / 中国药房

OBJECTIVE：To develop a method for simultaneous determination of 5 components in classical formula Huaihua san，including rutin ，naringin，neohesperidin，quercetin and pulegone. METHODS ：HPLC wavelength switching method was adopted. The determination was performed on Cosmosil C 18 column with mobile phase consisted of acetonitrile- 0.05％ phosphoric acid solution （gradient elution ）at the flow rate of 1.0 mL/min. The detection wavelengths were set at 257 nm for rutin ，283 nm for naringin and neohesperidin ，254 nm for quercetin ，252 nm for pulegone ，respectively. The column temperature was set at 30 ℃， and sample size was 10 μL. RESULTS：The linear range was 21.7-2 170 μg/mL for rutin，46-4 600 μg/mL for naringin，22.3- 2 230 μg/mL for neohesperidin，0.96-96 μg/mL for quercetin，2.7-270 μg/mL for pulegone（all r＞0.999），respectively. RSDs of precision，stability（24 h）and reproducibility tests were all lower than 2％（n＝6）. Average recoveries were 100.70％，99.31％， 101.10％，100.03％ and 99.63％（all RSD ＜2％，n＝9）. Among 3 batches of Huaihua san samples ，the contents of above 5 components were 20.055-22.615，25.557-27.806，11.428-13.250，0.350-0.478，2.372-4.011 mg/g，respectively. CONCLUSIONS ： Established method is simple ，accurate and reproducible ，and could be used for the simultaneous determination of 5 components in Huaihua san.

Simultaneous Determination of 7 Components in Niuhuang Qingwei Pills by HPLC-wavelength Switching Method / 中国药房

OBJECTIVE： To develop a method for simultaneous determination of 7 components of Niuhuang qingwei pills as chlorogenic acid， geniposide， forsythoside A， narirutin， baicalin， ammonium glycyrrhetate， chrysophanol. METHODS： HPLC-wavelength switching method was adopted. The determination was performed on Agilent ZORBAX SB-C18 column with mobile phase consisted of acetonitrile （A）-0.1％ phosphoric acid （B） gradient elution at the flow rate of 1.0 mL/min. The detection wavelengths were set at 348 nm （chlorogenic acid）， 238 nm （geniposide）， 330 nm （forsythoside A）， 280 nm （narirutin and baicalin）， 237 nm （ammonium glycyrrhetate）， 254 nm （chrysophanol）. The column temperature was 30 ℃， and sample size was 10 μL. RESULTS： The linear ranges of chlorogenic acid， geniposide， forsythoside A， narirutin， baicalin， ammonium glycyrrhetate， chrysophanol were 0.011 67-0.233 4 μg （r＝0.999 4）， 0.042 91-0.858 1 μg （r＝0.999 4）， 0.125 0-2.500 μg （r＝0.999 9）， 0.118 0- 2.360 μg （r＝0.999 9）， 0.119 6-2.392 μg （r＝0.999 7）， 0.030 57-0.611 4 μg （r＝0.999 6）， 0.006 201-0.124 0 μg（r＝0.999 4）， respectively； the limits of quantitation were 1.167， 0.858， 1.250， 1.180， 1.196， 0.611， 0.620 μg/mL， respectively； RSDs of precision tests were 0.98％， 1.04％， 0.59％， 1.50％， 0.83％， 1.24％ and 1.32％ （n＝6）， respectively. RSDs of stability tests were 1.21％， 0.97％， 1.42％， 0.71％， 0.98％， 1.87％ and 1.63％ （n＝6， 12 h）， respectively. Average recoveries were 98.32％， 98.11％， 98.81％， 98.50％， 98.30％， 98.16％ and 97.83％， and the RSDs were 1.37％， 1.41％， 0.64％， 1.01％， 1.18％， 1.16％ and 1.16％ （n＝6）， respectively. CONCLUSIONS： Established method is easy and reproducible. It can be used for the quality control of Niuhuang qingwei pills.