荧光分光光度法测定人尿中氟罗沙星的含量

目的:建立灵敏、准确、简便、快速的方法测定人尿中氟罗沙星的含量.方法:以290 nm为激发波长,以458 nm为发射波长,用荧光分光光度法测定人尿中氟罗沙星的排出速率.结果:氟罗沙星浓度在0.05～0.5 mg*L-1范围内,荧光强度与浓度呈良好的线性关系,检测限为0.03 mg*L-1.精密度为日内RSD<1.10%,日间RSD<2.98%(n=5),回收率为(98.6±1.3)%.结论:采用此法测定了2名健康受试者口服氟罗沙星片后的尿药排出速率.尿中药物排出速率最高是在服药后6～8 h,24 h内尿药累积排出率为56.12%,0～24 h内尿药浓度为(69.3±40.6)mg*L-1,显著高于大多数常见致病菌的MIC90,表明有效尿药浓度至少可维持24 h.     

脑灵胶囊中银杏总黄酮成分的含量测定

目的:测定脑灵胶囊中的银杏总黄酮含量.方法:用甲醇提取并制成供试品,采用分光光度法测定.结果:平均回收率为98.49%,RSD为2.39%.3批样品中银杏总黄酮的含量分别为4.47,4.66,4.81mg/粒.结论:本方法简便、准确、灵敏度高,可作为该制剂的质量控制方法.     

阿奇霉素凝胶的制备及质量控制

目的:制备阿奇霉素凝胶并建立质量标准.方法:研制阿奇霉素凝胶,采用硫酸呈色分光光度法测定制剂中阿奇霉素的含量.结果:阿奇霉素凝胶的平均回收率为(98.77±0.93)%.结论:该制剂制备工艺简单,性质稳定,质量可靠.     

复方丁香洗剂中丁香酚和苦参碱的含量测定

目的建立紫外分光光度法及酸性染料比色法测定复方丁香洗剂中丁香酚和苦参碱的含量.方法丁香酚、苦参碱均可与氢氧化钠成盐而溶于碱,易于分离,前者于(296±2)nm波长处测定吸收度,后者与溴麝香草酚蓝络合后于(415±2)nm波长处测定吸收度.结果丁香酚平均回收率为98.30%,RSD为0.76%,在10.26～23.95 mg·L-1范围有良好的线性关系(r=0.999 8);苦参碱平均回收率为98.63%,RSD为0.83%,在3～10.5 mg·L-1范围线性关系良好(r=0.999 6).结论本方法准确,灵敏度好,可用于复方丁香洗剂或中药制剂中的丁香酚、苦参碱含量测定.     

紫外分光光度法测定甲硝唑栓剂中的主药含量

目的 建立甲硝唑栓剂中甲硝唑含量的紫外分光光度检测方法。方法 采用吸收系数法：E^1m=377；检测波长：277nm。结果 甲硝唑回归方程：C=-16．681 235．540A，r=0．9998，平均回收率为100．1％，RSD为0．24％。结论 本法快速，方便，结果准确，辅料无干扰。适用于该制剂中甲硝唑的含量测定。     

Spectrophotometric dental colour measurement to assess age in living adults

The aim of this study was to evaluate the usefulness of spectrometrically measured colour parameters of teeth for age estimation in living adults. A total of 329 teeth were selected (162 upper central incisors and 167 upper canines) from 52 men and 50 women aged between 20 and 86 years. Colour measurements were performed in vivo on the vestibular surface of the teeth using a portable contact Spectro-color device. Colorimetric variables (L*, a*, b*), chromaticity coordinates (x, y, z), and indexes of whiteness (WIC, Z%, WI) and yellowness (YI) were calculated. The accuracy of colour values to estimate the age was determined by Receiver Operating Characteristic analysis. A more powerful age discrimination was obtained with upper incisors than with upper canines. Areas under the ROC curve ranged from 0.7 to 0.8 for all dental colour parameters measured in upper central incisors except for the variables L* and Z%, with sensitivity values ranging from 56% to 93% and specificity values from 38% to 92%. We conclude that spectrophotometric dental colour measurement may be an objective and useful tool to estimate age and meets medical ethical standards for application in living adults. However, further research is needed to study the effect of ethnicity and other factors on tooth colour.     

原料药粒径对头孢地尼颗粒体外溶出行为的影响

目的：考察原料药粒径对头孢地尼颗粒体外溶出度的影响。方法参照2010版中国药典第二法,以 pH ＝6．8磷酸盐缓冲液为溶出介质,转速为50 r·min －1,采用紫外分光光度法为分析方法,考察不同粒径的原料制备的头孢地尼颗粒与参比制剂溶出的一致性。结果粒径为 D90：142．90μm、D50：30．25μm、D10：3．47μm（100目筛）和 D90：51．21μm、D50：10．71μm、D10：2．25μm（200目筛）的头孢地尼原料制成的颗粒溶出行为与原研不相似;在不同溶出介质中,D90：35．62μm、D50：6．98μm、D10：1．66μm 的头孢地尼原料制成的颗粒,与参比制剂的溶出行为均相似。结论建立的分析方法简单可靠,原料微粉化能够有效提高难溶性药物的溶出度。     

紫外分光光度法测定阿替洛尔缓释微囊含量

目的：建立以紫外分光光度法测定阿替洛尔缓释微囊含量的方法。方法：将阿替洛尔缓释微囊研磨破碎,转移至容量瓶中,稀释后,在224nm处进行含量测定。结果：阿替洛尔在224nm处有最大吸收,辅料对测定无干扰。标准曲线方程：A=0.0355C+0.0014,线性范围为2.5～20.0μg·ml-1。回收率98.81%～99.36%,精密度和稳定性RSD均在2%以内,符合《中国药典》的要求。     

Regional differences in mucosal hemodynamics in experimental colonic injury in rats

In rat colon damaged by 10% acetic acid and by dinitrochlorobenzene, we test the following hypotheses: (1) mucosal hemodynamic changes are significantly different at the ulcer base, the ulcer margin, and the inflamed non-ulcer-bearing mucosa; and (2) these mucosal hemodynamic changes also vary with time after induction of the colonic injury. Mucosal hemodynamic changes were documented by reflectance spectrophotometry, and variations in gross mucosal morphology were confirmed by hematoxylin and eosin histologic sections. Results revealed that in the acute stage, the ulcer base, which was covered by necrotic debris, showed ischemia without congestion. The ulcer margin at the edge of the ulcer base showed ischemia with congestion. The nonulcerated mucosa, which appeared erythematous, showed increased perfusion. In the convalescent stage, all the altered perfusion patterns returned to normal. These observations offer plausible explanations for the variability in colonic perfusion observed in experimentally damaged colons.