呼净中有效成分的含量测定

复方制剂“呼净”中主要抗菌活性成分－恩诺沙星和盐酸脱氧土霉素均溶于酸液,并显示各自的紫外吸收光谱。在同一溶液（０．０１ｍｏｌ／Ｌ盐酸溶液）中同时用双波长等吸收点法和系数倍率法排除两组分之间的相互干扰,分别测定含量。其中,恩诺沙星用双波长等吸收点法测定,相关系数ｒ＝０．９９９６,平均回收率９９．４２％,ＣＶ＝０．３７％;盐酸脱氧土霉素：用系数倍率法测定,相关系数ｒ＝０．９９９９９,平均回收率９９．２２％,ＣＶ＝０．３９％。采用本法检验,其线性和回收率测定均取得了令人满意的结果,测定方法科学、准确、简便、快速。     

复方对乙酰氨基酚注射液含量测定的探讨

利用对乙酰氨基酚与安替比林在氯仿中溶解度的不同，将二者分离，再分别用紫外分光光度法测定其含量。结果为：对乙酶氨基酚的回收率为１００．６８％，ＣＶ＝０．２０％；安替比林的回收率为９８．４７％，ＣＶ＝０．４６％。     

紫外分光光度法测定平喘消肾肿散中盐酸吗啉胍的含量

采用紫外分光光度法直接测定平喘消肾肿散中盐酸码啉脒胍的含量，其结果为线性范围）～２６．７μｇ，平均回收率为１００．４５％，ＲＳＤ＝０．１９％。本法简便、快速、可靠、重现性好、阴性对照无干扰，可用于平喘消肾肿散中盐酸吗啉脒胍的含量测定。     

高效液相法测定盐酸沙拉沙星制剂的含量

采用高效液相色法测定盐酸沙拉沙星制剂的含量,用Ｎａｖａ－ＰａｋＣ１８１５０＊３．９ｍｍ色谱柱,以０．５ｍｏｌ／Ｌ柠檬酸－０．５ｍｏｌ／Ｌ醋酸铵－乙腈（８０：１０：１８）为流动相,用高氯酸调ＰＨ至２．４;流速１．２ｍｌ／ｍｉｎ,检波波长２７４ｎｍ;线性范围０．２－１．２μｇ（ｒ＝０．９９９９）,平均回收率９９．７％,ＲＳＤ＝０．３％（ｎ＝７）。本方法简便,准确,适用该产品质量控制。     

分光光度法测定盐酸噻咪唑片的含量

以０．１ｍｏｌ／Ｌ的盐酸液为溶剂,采用分光光度法测定盐酸噻咪唑片的含量,测定浓度在２～１０μｇ／ｍｌ范围内线性关系良好（ｒ＝０．９９９９）,平均回收率为９９．６％,ＲＳＤ为０．４４％,方法简便,快速、准确,重现性好。     

薄层扫描法测定虾蟹脱壳促长素中蜕皮激素的含量

用双波长薄层扫描法测定虾蟹脱壳促长素中β－蜕皮激素的含量，方法简便，重现性好。其中：相关系数ｒ＝０．９９７；平均回收率为１０１．４％，ＣＶ＝０．７０％。     

盐酸林可霉素—盐酸环丙沙星复方制剂含量测定方法研究

用高效液相色谱法及紫外分光光度法分别测定盐酸林可霉素、盐酸环丙沙星的含量,结果表明,线性关系良好,回收率满意,适用于该产品的含量测定。     

双波长分光光度法测定“强克33”中诺氟沙星的含量

根据９６版《兽药质量标准》第一册中诺氟沙星原料的含量测定，是用高氯酸滴定；制剂是用碱稀释后，用分光光度法测定。但本样品由于辅料太多，影响诺氟沙星的溶解，如先用有机溶剂溶解，再用乙醇稀释后用分光光度法测其含量，由于呋喃唑酮的干扰，其测定误差可达２５％左右。而用双波长分光光度法测定诺氟沙星的含量，其相关系数ｒ＝０．９９９９，平均回收率为１００．５％（ｎ＝５），ＣＶ＝０．４４％，结果准确、简便。     

紫外分光光度法测定复方乙酰甲喹制剂中双组分含量

在同一测定溶剂中,分别用单波长和双波长等吸收点法同时测定乙酰甲喹和甲氨苄氨嘧啶（ＴＭＰ）的含量。其中,乙酰甲喹的浓度Ｃ与Ａ的相关系数ｒ为０．９９９０,平均回收率为９９．２％,变异系数ＣＶ＝０．４４％;ＴＭＰ的浓度Ｃ与△Ａ的相关系数ｒ为０．９９９１,平均加收率为９９．９％,变异系数ＣＶ＝１．０４％。     

紫外分光光度法测定盐酸环丙沙星、盐酸小檗碱预混剂中盐酸小檗碱的含量

以0．05mol／L硫酸作对照液，用紫外分光光度法在421nm测定了盐酸环丙沙星、盐酸小檗碱预混剂中盐酸小檗碱的含量。结果表明，盐酸小檗碱在8-56μg／mL范围内，吸光度与浓度呈良好的线性关系，相关系数为0．9992，平均回收率为101．32％，RSD为0．94％（n=5）。本方法简便、快速、结果准确，适用于该制剂中盐酸小檗碱的质量分析检验。     

柱前衍生HPLC法测定猪乳中游离谷氨酰胺的动态变化

目的在于建立一种准确、简便、快速的高效液相色谱法,测定乳中Gln的含量;研究猪乳中游离Gln水平的动态变化规律。反相C18柱为固定相,异硫氰酸苯酯为柱前衍生剂,50mmol/L醋酸缓冲液(pH6.50)-乙腈(97.7∶2.3)为流动相,进行单泵洗脱,在波长254nm处检测Gln的含量。结果:线性范围25~500μmol/L,相关系数r=0.9987,批内变异系数为3.64%,高低2种浓度的回收率分别为(104.6%)和(99.9%)。猪乳中游离Gln含量在产后第1天为29.22μmol/L,随时间推移呈上升趋势,至产后27d(593.74μmol/L)达到高峰。结论:本法简便、快速、无需梯度洗脱,分离效果好,适用于有关动物的乳中Gln的检测和研究;缺乏Gln可能是仔猪断奶后腹泻的一个重要原因。     

鸡组织中尼卡巴嗪残留HPLC检测方法的研究

建立了尼卡巴嗪标识残留物在鸡组织中残留的HPLC检测方法.样品用乙腈提取,正己烷脱脂,C18固相小柱净化.以乙腈:水(52: 48)为流动相,紫外检测器在波长340 nm处检测.在该检测条件下,尼卡巴嗪标示残留物DNC的检测限为31.25μg/kg,定量限为100μg/kg.DNC工作液在31.25～8 000 μg/kg范围内药物浓度与峰面积呈良好的线性关系(r=0.999 9).尼卡巴嗪在鸡肌肉、肝脏和肾脏中添加浓度分别为0.1、0.2和0.4 μg/g时,样品回收率在80.06%～89.87%之间.批内变异系数小于7.09%,批间变异系数小于6.34%.     

高效液相色谱法检测蜂蜜中替硝唑药物残留研究

研究建立蜂蜜中替硝唑残留量的高效液相色谱测定方法。样品经12mL乙酸乙酯液液萃取、净化,在317nm波长下用二极管矩阵检测器检测。色谱柱为Agela Venusil ASB-C18(4.6×250mm,5μm),流动相甲醇∶水为17∶83(V/V),流速1.0mL/min。替硝唑浓度在0.10～4.00μg/mL范围内与峰面积呈良好的线性关系。平均回收率为82.3%～90.0%,相对标准偏差为2.27%～5.08%,方法的最低检测限10.0μg/kg。     

70份紫云英种质资源表型多样性及其在豫南地区的结实特征北大核心CSCD

对70份当地和引入紫云英种质资源在豫南地区种植的表型性状和结实特征进行研究,结果表明,供试紫云英均可在豫南地区完成扩繁,19个调查性状的变异系数(CV)介于1.3%~73.2%,其中冠层面积(CV=45.9%~73.2%)、始荚高度(CV=46.0%~52.9%)、生殖分枝数和生殖分枝比率(CV=34.6%~48.4%)、二级分枝数(CV=41.2%~41.3%)、返青期株高(CV=30.2%~39.2%)、种子产量(CV=24.4%~35.7%)变异性较高。信紫1号、XYHY-1等6个当地资源在越冬期和返青期叶片呈现紫红色。种子产量与返青期株高、盛花期株高、越冬期冠层大小、始荚高度、结荚层数、种子千粒重显著正相关;种子千粒重与返青期株高、盛花期株高、越冬期冠层大小、始荚高度、结荚层数、生殖分枝比率显著正相关,与出苗至盛花期天数、全氮和全磷含量显著负相关。引入资源平均种子产量为1015.5 kg·hm^(-2),当地资源平均种子产量为1096.5 kg·hm^(-2)。与冬油菜和冬小麦相比,大部分紫云英种质资源在豫南地区繁种具有较高的经济效益,适合移栽稻接茬。     

紫外分光光度法和高效液相色谱法测定盐酸土霉素可溶性粉的含量

采用紫外分光光度法和高效液相色谱法测定盐酸土霉素可溶性粉中土霉素的含量。紫外分光光度法试验表明,用0.01 mol/L盐酸溶液作参比液,以268 nm为测定波长,土霉素在4~32μg/mL范围内吸光度与浓度呈良好的线性关系,相关系数r=0.9999,平均回收率(n=5)为101.04%,RSD=1.02%。高效液相色谱法试验表明,以0.05 mol/L草酸铵溶液-二甲基甲酰胺-0.2 mol/L磷酸氢二铵溶液(75∶20∶5)为流动相,以280 nm为检测波长,土霉素在0.02~0.14mg/mL范围内浓度与峰面积线性关系良好,相关系数r=0.9999,平均回收率(n=5)为100.52%,RSD=0.25%。紫外分光光度法、高效液相色谱法与抗生素微生物检定法比较,结果基本一致。     

Calibration and diagnostic accuracy of simple flotation, McMaster and FLOTAC for parasite egg counts in sheep

The present study was aimed at carrying out a calibration and a comparison of diagnostic accuracy of three faecal egg counts (FEC) techniques, simple flotation, McMaster and FLOTAC, in order to find the best flotation solution (FS) for Dicrocoelium dendriticum, Moniezia expansa and gastrointestinal (GI) strongyle eggs, and to evaluate the influence of faecal preservation methods combined with FS on egg counts. Simple flotation failed to give satisfactory results with any samples. Overall, FLOTAC resulted in similar or higher eggs per gram of faeces (EPG) and lower coefficient of variation (CV) than McMaster. The "gold standard" for D. dendriticum was obtained with FLOTAC when using FS7 (EPG=219, CV=3.9%) and FS8 (EPG=226, CV=5.2%) on fresh faeces. The "gold standard" for M. expansa was obtained with FLOTAC, using FS3 (EPG=122, CV=4.1%) on fresh faeces. The "gold standard" for GI strongyles was obtained with FLOTAC when using FS5 (EPG=320, CV=4%) and FS2 (EPG=298, CV=5%). As regard to faecal preservation methods, formalin 5% and 10% or freezing showed performance similar to fresh faeces for eggs of D. dendriticum and M. expansa. However, these methods of preservation were not as successful with GI strongyle eggs. Vacuum packing with storage at +4°C permitted storage of GI strongyle eggs for up to 21 days prior to counting. Where accurate egg counts are required in ovine samples the optimum method of counting is the use of FLOTAC. In addition, we suggest the use of two solutions that are easy and cheap to purchase and prepare, saturated sodium chloride (FS2) for nematoda and cestoda eggs and saturated zinc sulphate (FS7) for trematoda eggs and nematoda larvae.     

紫外分光光度法测定甲基丁香酚含量方法的建立

采用紫外分光光度法,检测波长230 nm对甲基丁香酚原料药含量进行测定.结果表明,在Oμg/mL～5 μg/mL浓度范围内线性关系良好,回归方程为A=0.025 1x-0.001 4(r=0.996 6,n=5),平均回收率为99.45％,RSD为1.03％(n=3),测定的甲基丁香酚原料药的含量为98.27％.该方法...     

Investigations on the usefulness of the dry chemistry blood anaylsis system SPOTCHEM SP-4410in laboratory diagnosis of cattle

The usefulness of the dry-chemistry blood analyzer, SPOTCHEM SP-4410, for analysis of bovine blood chemistry was studied in a veterinary clinic. The control serum Precipath-U, Boehringer-Mannheim, was used to measure precision within each run and between days. The coefficients of variation (CV) ranged between 1.54% and 4.86%, with the exception of albumin and creatine phosphokinase showing a CV of 6.3% and 10.03% for between-day precision. For methodological comparison bovine serum samples were assayed with both the SPOTCHEM SP-4410 and the automated blood analyzer HITACHI 705, which served as a wet-chemistry reference system. The following analytes were measured: glucose, urea, creatinine, total protein, albumin, total bilirubin and the enzymes AST, CPK and gamma-GT. For hemoglobin, which was measured in heparinized whole blood, the CO oximeter 855, CIBA-CORNING, was used as a reference system. The comparative analysis showed very good correlation in eight of ten parameters and their correlation coefficients (r) ranged between 0.962 and 0.998. Only the correlation coefficients of the analysis of total bilirubin (r = 0.903) and albumin (r = 0.771) were less satisfactory. The recovery test was carried out with the two parameters glucose and blood urea. The recovery of glucose was 93.7% and of urea 98.8%. The SPOTCHEM SP-4410 is easy to use and proved to be reliable and accurate, and therefore it seems to be useful for analysis of bovine blood samples.     

紫外分光光度法测定替米考星预混剂的含量

采用紫外分光光度法测定替米考星预混剂的含量。结果表明,在5~25μg/mL浓度范围内,浓度与吸光度值呈良好的线性关系,相关系数r=0.999 8,平均回收率为99.42%;相对标准偏差RSD=1.10%。本方法适合于替米考星预混剂含量的快速测定。