一阶导数光谱法测定斑秃搽剂中米诺地尔的含量

目的：建立斑秃搽剂中米诺地尔的含量测定方法。方法：采用一阶导数光谱法直接测定斑秃搽剂中米诺地尔的含量，测定波长为298nm。结果：线性范围为6～14μg／mL，r=0．99998，平均回收率为100．22％，RSD=l、06％(n=9)。结论：方法简便、快速、准确，可消除该制剂中其他组分的干扰，适用于医院制剂的质量控制。     

高效液相色谱法测定米诺地尔搽剂中米诺地尔的含量

目的建立测定米诺地尔搽剂中米诺地尔含量的高效液相色谱(HPLC)检验方法。方法采用Nova-PaKC18色谱柱(150mm×4.6mm,5μm),流动相为甲醇-水(70∶30),流速为1.0mL/min,检测波长为285nm。结果米诺地尔在2.5～20mg/L浓度范围内含量与峰面积比呈现良好的线性关系(r=0.9999),平均回收率为99.5%,RSD为1.85%,最低检出浓度为0.5mg/L。结论本法能准确检测米诺地尔搽剂中米诺地尔的含量,因此可作为米诺地尔搽剂质量控制的有效测量方法。     

HPLC法测定米诺地尔搽剂中米诺地尔的含量

目的建立用于测定米诺地尔搽剂中米诺地尔含量的HPLE法。方法采用HPLC法测定,色谱柱：Hypersil ODS2 （250mm×4．6mm,5μm）,流动相：V（甲醇）：V（0．1％三乙胺水溶液）=25：75,检测波长285nm,柱温30℃,流速1mL·min^-1。结果米诺地尔在质量浓度6．6—39．6mg·L^-1内与峰面积之间呈现良好的线性关系（r=0．9996）,平均回收率为107．99％,RSD为0．99％。结论本方法简便、灵敏度高,能准确检测米诺地尔搽剂中米诺地尔的含量,可作为米诺地尔搽剂质量控制的有效测量方法。     

米诺生发搽剂的质量标准研究

目的完善米诺生发搽剂的质量标准,以保证产品质量。方法采用薄层色谱法、紫外-可见光谱法分别对制剂中的当归、赤芍、白鲜皮及米诺地尔进行定性鉴别;采用一阶导数光谱法对制剂中的米诺地尔进行含量测定。结果薄层色谱斑点清晰,在与对照品或对照药材相应的位置上显相同颜色的斑点,阴性对照无干扰;紫外-可见光谱鉴别中,米诺地尔在(230±3)、(262±3)、(286±3)nm波长处有最大吸收峰;一阶导数光谱法含量测定中,米诺地尔在6.2~18.6μg/ml(r=0.999 7)范围内线性关系良好;平均回收率为99.4%,RSD为0.22%。结论本方法操作简便,准确度高,重复性好,能全面、有效地控制该制剂的质量。     

复方桑参米诺地尔搽剂中米诺地尔的HPLCLC定

建立了高效液相色谱法测定复方桑参米诺地尔搽剂中米诺地尔的含量。采用C18柱，流动相为甲醇．乙腈·水（40：10：50），流速1．2ml／min，检测波长230nm，内标为对乙酰氨基酚。米诺地尔在3．649。6μg／ml浓度范围内线性关系良好（r=0．9999），回收率大于98％，日内和日间RSD均小于1％。     

一阶导数分光光度法测定复方头孢氨苄胶囊中头孢氨苄的含量

一阶导数分光光度法测定复方头孢氨苄胶囊中头孢氨苄的含量于治国，宋洪杰，尚飞沈阳药学院药学系１１００１５吴小兰，王景春沈阳军区第２０２医院复方头孢氨苄胶囊为ＣＬＸ（头孢氨苄）和ＴＭＰ（甲氧苄氨嘧啶）的复方制剂．现行质量标准［１］采用剩余碘量法测定其中的...     

导数光谱法测定复方金霉素涂剂中两组分含量

目的 建立复方金霉素涂剂中盐酸金霉素和盐酸达克罗宁含量测定方法。方法 采用零阶导数在368mn波长处测定盐酸金霉素的含量；二阶导数在308mn波长处测定盐酸达克罗宁含量。结果 盐酸金霉素、盐酸达克罗宁平均回收率RSD分别为101．4％、0．7％，100．2％、1．1％。结论 该方法简便、快速、准确，可用于复方金霉素涂剂中盐酸金霉素和盐酸达克罗宁的含量测定。     

复方曲安奈德水杨酸搽剂制备过程中的质量控制及三组分的含量测定

目的分析复方曲安奈德水杨酸搽剂制备过程中的质量控制及三组分的含量测定有效方法。方法将曲安奈德、水杨酸及氯霉素作为主要成分,制备复方曲安奈德水杨酸搽剂,得出曲安奈德、水杨酸、氯霉素的含量,并分析出质量控制的主要方法。结果通过高效液相色谱法可较好地检出复方曲安奈德水杨酸搽剂含量。曲安奈德的含量为100.06%,水杨酸含量为100.19%,氯霉素含量为100.35%。曲安奈德平均回收率为99.69%,水杨酸平均回收率99.69%,氯霉素平均回收率99.91%。曲安奈德RSD为0.49%,水杨酸RSD为0.58%,氯霉素RSD为0.49%。结论制备复方曲安奈德水杨酸搽剂时,高效液相色谱法可对其中主要成分进行有效检测,并起到较好质量控制效果,但当前制备复方曲安奈德水杨酸搽剂过程中,三组分的含量有超过规定量的趋势,需着重注意。     

复方酮康唑搽剂的制备和质量控制

目的:制备复方酮康唑搽剂,并制定质量控制标准。方法:以酮康唑、氧氟沙星为主药,制成复方酮康唑搽剂,用紫外分光光度法测定含量。结果:所制备的搽剂质量稳定,无刺激性,酮康唑、氧氟沙星平均回收率分别为100.67%、100.39%,RSD分别为0.86%、0.81%。结论:制剂工艺简单,含量测定操作方法简便,结果准确,适于医院制剂室生产。     

复方替硝唑搽剂的制备及质量控制

目的:制备复方替硝唑搽剂,并制定质量控制标准.方法:以替硝唑、氧氟沙星为主药,制成复方替硝唑搽剂,用紫外分光光度法测定含量.结果:所制备的搽剂质量稳定,无刺激性,疗效确切.替硝唑和氧氟沙星平均回收率分别为100.43%和99.66%(n=5), RSD分别为0.95%和0.73%.结论:制剂工艺简单,含量测定操作方法简便,结果准确,适于医院制剂室生产时的质量控制.     

Derivative spectrophotometric method for simultaneous determination of clindamycin phosphate and tretinoin in pharmaceutical dosage forms

A derivative spectrophotometric method was proposed for the simultaneous determination of clindamycin and tretinoin in pharmaceutical dosage forms. The measurement was achieved using the first and second derivative signals of clindamycin at (¹D) 251 nm and (²D) 239 nm and tretinoin at (¹D) 364 nm and (²D) 387 nm.The proposed method showed excellent linearity at both first and second derivative order in the range of 60–1200 and 1.25–25 μg/ml for clindamycin phosphate and tretinoin respectively. The within-day and between-day precision and accuracy was in acceptable range (CV<3.81%, error<3.20%). Good agreement between the found and added concentrations indicates successful application of the proposed method for simultaneous determination of clindamycin and tretinoin in synthetic mixtures and pharmaceutical dosage form.     

一阶导数光谱法测定维甲酸凝胶的含量

目的：建立维甲酸凝胶的质控方法。方法：采用一阶导数光谱法在378nm处测定维甲酸的含量。结果：维甲酸的平均回收率为100.37％。结论：所建立的方法适用于维甲酸凝胶剂的含量测定。     

A comparative study of the ratio spectra derivative spectrophotometry, Vierordt's method and high-performance liquid chromatography applied to the simultaneous analysis of caffeine and paracetamol in tablets

Two spectrophotometric methods and high-performance liquid chromatography were proposed for the simultaneous analysis of caffeine and paracetamol in a tablet formulation. The ratio spectra derivative method is based on the use of the analytical signals obtained by measuring at 267.9 and 291.0 nm for caffeine and 237.0 and 251.8 nm for paracetamol in the first derivative of the ratio spectra. Calibration graphs were prepared in the range 4-40 microg/ml for caffeine and 8-48 microg/ml for paracetamol. In Vierordt's method, A1(1) (1%, 1cm) values of paracetamol and caffeine were determined at 242.9 and 273.0 nm in zero-order spectra. The matrix for A1(1) (1%, 1cm) values was written and the amounts of both drugs were calculated by means of the program 'Matlab' software. The results obtained by these spectrophotometric methods were compared with the results of HPLC method.     

Simultaneous determination of benazepril hydrochloride and hydrochlorothiazide in tablets by second-order derivative spectrophotometry

A second-order derivative spectrophotometric method for the simultaneous determination of benazepril hydrochloride and hydrochlorothiazide in pharmaceutical dosage forms is described. The determination of benazepril hydrochloride in the presence of hydrochlorothiazide was achieved by measuring the second-order derivative signals at 253.6 and 282.6 nm, while the second-order derivative signal at 282.6 nm was measured for the determination of hydrochlorothiazide. The linear dynamic ranges were 14.80-33.80 microg ml(-1) for benazepril hydrochloride and 18.50-42.20 microg ml(-1) for hydrochlorothiazide, the correlation coefficient for the calibration graphs were better than 0.9998, n = 5, the precision (%RSD) was better than 1.43% and the accuracy was satisfactory (Er < 0.99%). The detection limits were found to be 2.46 and 1.57 microg ml(-1) for benazepril hydrochloride and hydrochlorothiazide, respectively. The method was applied in the quality control of commercial tablets and proved to be suitable for rapid and reliable quality control.     

Investigation on the photostability of a tretinoin lotion and stabilization with additives

Tretinoin, a drug that is used in topical preparations for the treatment of acne vulgaris, is known to be very susceptible to degradation under daylight. The objective of this work was to investigate the degradation of a tretinoin lotion placed in front of a xenon lamp. Analysis was performed with HPLC. The tretinoin lotion was degraded to about 20% of its initial concentration within 30 min. Incorporation of tretinoin in beta-cyclodextrin or in some surfactants (Brij(R)s) did not have any effect on the photodegradation of tretinoin. Neither could a UV-B sunscreen retard the photodegradation of tretinoin while a UV-A sunscreen had very little effect. Irradiation with selected wavelengths revealed that 420 nm seemed to be the most harmful wavelength for the degradation of tretinoin and not the wavelength of maximum absorption (350 nm) as expected. Then the addition of the yellow colourants chrysoin and fast yellow, absorbing in the region of 420 nm, was tested. These colourants did indeed retard the photo-degradation of tretinoin more or less depending on the concentration of the dye. Finally we only had to select a concentration that was still effective but that did not colour the skin.     

HPLC双波长法同时测定复方维A酸软膏中2主药的含量

目的:建立同时测定复方维A酸软膏中维A酸和马来酸氯苯那敏含量的方法。方法:采用高效液相色谱法。色谱柱为Luna C18柱,流动相为甲醇-磷酸盐缓冲液(0.02mo·lL-1磷酸二氢钾,用1mo·lL-1氢氧化钠调节pH至7.0,V/V)=80:20,流速为1.0mL·min-1,进样量为20μL,柱温为30℃,维A酸的检测波长为350nm,马来酸氯苯那敏的检测波长为262nm。采用外标法计算含量。结果:维A酸检测浓度在20～100μg·mL-1范围内与峰面积积分值呈良好的线性关系(r=0.9999),低、中、高平均加样回收率分别为98.48%、97.15%、98.88%(RSD=0.92%);马来酸氯苯那敏检测浓度在30～150μg·mL-1范围内与峰面积积分值呈良好的线性关系(r=0.9999),低、中、高平均加样回收率分别为100.47%、99.01%、99.75%(RSD=0.83%)。结论:该方法简便、准确、重复性好,可用于复方维A酸软膏的质量控制。     

Rapid and simple methods for quantitative analysis of some antidepressant in pharmaceutical formulations by using first derivative spectrophotometry and HPLC

Two rapid, simple and accurate first derivative spectrophotometry and HPLC method for the determination of nefazodone hydrochloride and sertraline hydrochloride in pharmaceutical formulations are discussed. The first one is a derivative spectrophotometric procedure and the second one is based on a HPLC method with a UV detector. In the first method, first derivative spectrophotometry, nefazodone hydrochloride or sertraline hydrochloride by measurement of their first derivative signals at 241.8-256.7 nm (peak-to-peak amplitude), or 271.6-275.5 nm (peak-to-peak amplitude), respectively. Calibration graphs were established for 10.0-42.0 microg ml(-1) nefazodone hydrochloride, or 8.0-46.0 microg ml(-1) sertraline hydrochloride. In the other method, HPLC, the UV detection was carried out at 265.0 nm (nefazodone hydrochloride) and 270.0 nm (sertraline hydrochloride). The samples were chromatographed on a Supercosil RP-18 column. The mobile phases were methanol:acetonitrile:phosphate buffer at pH 5.5 (10:50:40 v/v/v) (nefazodone hydrochloride) and methanol:phosphate buffer at pH 4.5 (20:80 v/v) (sertraline hydrochloride). The results obtained from first derivative spectrophotometric method were comparable with those obtained by using HPLC. It was concluded that both the developed methods are equally accurate, sensitive, and precision could be applied directly and easily to the pharmaceutical formulations of nefazodone hydrochloride and sertraline hydrochloride, respectively.     

Rapid determination of minoxidil in human plasma using ion-pair HPLC

A rapid, simple and sensitive ion-pair high-performance liquid chromatography (HPLC) method has been developed for quantification of minoxidil in plasma. The assay enables the measurement of minoxidil for therapeutic drug monitoring with a minimum detectable limit of 0.5 ng ml(-1). The method involves simple, one-step extraction procedure and analytical recovery was complete. The separation was performed on an analytical 150 x 4.6 mm i.d. microbondapak C18 column. The wavelength was set at 281 nm. The mobile phase was a mixture of 0.01 M sodium dihydrogen phosphate buffer and acetonitrile (60:40, v/v) containing 2.5 mM sodium dodecyl sulphate adjusted to pH 3.5 at a flow rate of 1 ml/min. The column temperature was set at 50 degrees C. The calibration curve was linear over the concentration range 2-100 ng ml(-1). The coefficients of variation for inter-day and intra-day assay were found to be less than 8%.