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高效液相色谱法检测复方制剂中恩诺沙星和痢菌净的含量 总被引：2，自引：1，他引：1
用HPLC方法测定了复方制剂中恩诺沙星和痢菌净的含量。色谱柱SUPELCOSILTMLC 18(2 5cm× 4 .6mm ,5 μm) ,柱温 30℃ ,流动相为甲酸 三乙胺 乙腈 水 (6∶3∶16.3∶84 .7) ,流速 1.2ml/min ,进样量 10 μl。恩诺沙星、痢菌净的检测波长分别为 2 80nm和 374nm ,线性范围分别为 0 .5～ 5 0 μg/ml(r =0 .9992 )和 1～ 10 0 μg/ml(r =0 .9997)。平均回收率分别为99.5 1% (RSD =1.83% )和 99.37% (RSD =1.69% )。本文还讨论了流动相的成份和比例对恩诺沙星色谱峰的拖尾影响 ,并对两药物的分离度进行了讨论 相似文献
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建立了测定小柴胡散中黄芩苷含量的高效液相色谱法.采用Hypersil BDS C18柱(5 μm,4.6 mm×200 mm),以甲醇-0.025%磷酸溶液(55∶ 45,V/V)为流动相,紫外检测器检测波长为280 nm.对照品在0.038 6～0.617 0 μg/mL的浓度范围内呈现良好的线性关系(R2=0.998 5),黄芩苷加样平均回收率为 98.61%,RSD为 2.64%.该方法简便、准确、快速,适合于小柴胡散的质量控制检测. 相似文献
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口服硫酸安普霉素在猪体内的药代动力学和生物利用度研究 总被引：1，自引：0，他引：1
对 5头健康猪口服和静脉注射国产硫酸安普霉素 ,研究其在猪体内的药代动力学和生物利用度。用微生物法测定血清药物浓度 ,结果平均回收率为 99.0 3%,血清最低检测浓度为 0 .0 5 μg/ ml,日内日间变异系数为 2 .2 %～ 5 .0 %,且血清浓度在0 .0 5～ 3μg/ m l范围呈良好线性关系 (r=0 .996 5 )。以 2 0 mg/ kg口服和以 2 0 mg/ kg静脉注射硫酸安普霉素后 ,经 Mcpkp药代动力学计算机程序处理 ,体内药物运转分别符合开放型一室和二室模型 ,生物半衰期 t1 / 2 分别为 (7.36± 1 .5 2 ) h和 (3.1 7± 0 .75 )h;CLB分别为 4 .82 L / kg· h和 0 .1 6 L / kg· h;AUC值分别为 4 .1 4和 1 30 .6 2。口服 :Cmax为 (0 .2 4± 0 .0 3)μg/ ml;Tp为 (5 .1 2±0 .6 1 ) h;T1 / 2 K为 (7.36± 1 .5 2 ) ;生物利用度 (AUCp.0 / AUCi.v)为 (3.1 92 8± 0 .70 4 4 ) %。上述药代动力学数据为动物临床用药提供有价值的理论依据 相似文献
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牛奶中氟喹诺酮类药物残留量检测方法研究 总被引：4，自引：2，他引：2
建立了牛奶中5种氟喹诺酮类药物(达氟沙星、恩诺沙星、环丙沙星、沙拉沙星和二氟沙星)残留检测的高效液相色谱-荧光检测法.结果表明,环丙沙星、恩诺沙星、沙拉沙星、二氟沙星在5～300 ng/mL,达氟沙星在1～60 ng/mL浓度范围内,呈良好的线性关系,r均大于0.999 9.方法最低检测限环丙沙星、恩诺沙星、沙拉沙星、二氟沙星为5 ng/mL,最低定量限为10 ng/mL.达氟沙星最低检测限为1 ng/mL,最低定量限为2 ng/mL.环丙沙星、恩诺沙星、沙拉沙星、二氟沙星在10、50、100 ng/mL三种浓度添加水平上,平均回收率为70%～94%,达氟沙星在2、10、20 ng/mL三种浓度添加水平上,平均回收率为73%~88%.批内、批间RSD均小于11%. 相似文献
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将达氟沙星（danofloxacin, DFLX）与牛血清白蛋白(BSA)、卵清白蛋白(OVA)偶联分别作为免疫原与包被原, 达氟沙星为竞争的半抗原，建立间接竞争ELISA检测方法。试验结果表明,理想的包被抗原浓度为1.25 μg/L, 多抗(DFLX-PcAb)工作浓度为1∶10000,酶标二抗的工作浓度为1∶4000,最适检测范围为0.1～10 ng/L,最低检测限为0.2 ng/L, 批内和批间变异系数分别为3.81%和6.25%。得到回归方程y=0.7975-0.125x（R2=0.989）和标准曲线，从而建立了DFLX的快速检测残留的间接竞争酶联免疫吸附试验（ci-ELISA）。 相似文献
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HPLC法测定鸡蛋中土霉素和金霉素的残留量 总被引：3，自引：0，他引：3
采用RP-HPLC方法同时测定了鸡蛋中土霉素和金霉素的残留量.用0.01 mol/L的乙二胺四乙酸二钠溶液和0.3%磷酸溶液为提取液,三氯乙酸(1 1)溶液为蛋白沉淀剂,离心后上清液经C18固相萃取柱净化、浓缩.色谱柱为Waters Symmetry ShieldTM RP18柱,250 mm×4.6 mm (i.d.),粒径5 μm;检测波长353 nm;以0.02 mol/L草酸∶乙腈∶ 0.01 mol/L磷酸二氢钠(45∶ 19∶ 36,V/V/V)为流动相.土霉素和金霉素标准曲线的线性范围分别为0.05～1.0 μg/mL和0.1～2.0 μg/mL.经过3种不同浓度回收率的测定,其回收率在50.6%～85.6%之间,RSD%小于8.60%(n＝5). 相似文献
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反相高效液相色谱法测定饲料中喹乙醇的含量 总被引：2，自引：0，他引：2
建立了反相高效液相色谱法测定饲料级喹乙醇、预混合饲料和配合饲料中喹乙醇含量的方法。色谱柱为C1 8,1 5 0× 4.6mm ,5 μm ;流动相为甲醇 +水 ( 1 5∶85 ,V/V) ;检测波长为 2 60nm ;柱温为室温。结果表明 :在 0～ 1 83.2 6μg/mL之间呈现良好的线性关系 ,相关系数r2 =1 .0 ;3个不同浓度样品加样回收率分别为 96.1 4%、98.61 %和 99.42 %。本方法简便 ,快速 ,准确度和精密度较高 ,适用于饲料中喹乙醇含量的测定 相似文献
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应用 YWG-C1 8色谱柱 ( 2 5 0 mm× 4.6mm,5 μm) ,Waters TM486型可调波长紫外检测器 ,检测波长 2 65 nm;0 .0 1 M磷酸钾 ( p H=7.0 )∶乙腈 ( 3∶ 1 )为流动相 ;含量测定采用标准曲线法 ,建立了反相 HPLC法检测绵羊血浆中克洛素隆含量的方法。同时对绵羊以 7mg/ kg单剂量经静脉注射、口服 2种途径给药的药代动力学及生物利用度进行了研究。血药浓度在 0 .0 0 5～ 2 .0 μg/ ml及 2 .0～ 5 0 .0 μg/ ml范围呈良好线形关系 ( R=0 .9941、0 .9970 ) ,平均回收率 93 .2 %,血药最低检测限 0 .0 0 5 μg/ ml,日内日间变异系数分别小于 1 0 %、1 1 %。2种途径给药后血药浓度结果经 MCPKP药代动力学统计软件处理 ,体内药物运转分别符合三室开放模型和一室开放模型。结果表明 ,绵羊静注克洛素隆后体内药物分布广泛 ,口服后吸收较好 ,但消除较静注缓慢。 相似文献
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建立并验证了高效液相色谱法测定盐酸二氟沙星粉中二氟沙星含量的方法。采用十八烷基硅烷键合硅胶色谱柱(4.6 mm×250 mm,5μm),以磷酸溶液(取磷酸3.0 m L,加水至1000 m L,用三乙胺调节p H至3.0±0.1,加乙腈50 mL)-甲醇(78∶22,V/V)为流动相,流速为1.0 mL/min,柱温为30℃,波长273 nm。试验结果表明二氟沙星在2~100μg/m L范围内线性良好,R~2=0.9999,平均回收率为98.1%(n=9),RSD为1.0%。本文开发的方法与农业部公告1960号收载的紫外分光光度法相比具有更好的专属性,同时简便、快速、准确,适用于产品的质量控制。 相似文献
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ELISA(酶联免疫吸附试验 )是一种适用于农村大规模血清学诊断的免疫新技术。我们在普查牛锥虫病中 ,初步探讨出实验材料最适稀释浓度 ,即抗原为 1 0～ 2 0 μg/ml,血清抗体为 1∶ 1 0 0～ 50 0之间 ,酶标记物为 1∶ 460。在加被检血清之前 ,先加 0 .5%牛血清白蛋白 (BSA) 0 .4ml孵育、洗涤可阻止非特异性蛋白质的竞争性吸附 ,在现场试用可达到满意的检出效果。现将报告如下。1 材料与方法1 .1 锥虫抗原1 .1 .1 鲜虫抗原 从摘脾感染锥虫的犬血中分离获得纯净的虫体。用 p H 7.2、0 .0 6M的 PBS按 1∶9稀释后 ,于液氮 (- 1 96℃ )反… 相似文献
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本文概述了猪的毛色类型、猪的毛色遗传模式,着重综述了猪毛色基因分子基础的研究进展,指出存在问题并就未来发展方向做了思考。 相似文献
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魏静 《四川畜牧兽医学院学报》2009,(4):28-32
在现代法律秩序中,商会自治规范是制定法的基础和必要的补充,甚至在某些方面替代了制定法;商会自治规范主要包括商会组织规范、行为规范、惩罚规范以及争端解决规范等;其效力仅及于其内部成员;商会自治规范和制定法之间存在冲突,但也存在整合的基础。 相似文献
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Effects of size of ingestively masticated fragments of plant tissues on kinetics of digestion of NDF
Ingestively masticated fragments were collected and sized via sieving. Different sizes of esophageal masticate and ruminal digesta fragments, and ground fragments of larger masticated pieces were incubated in vitro, and undigested NDF remaining at intervals of up to 168 h of incubation was determined. The ruminal age-dependent time delay (tau) for onset of digestion of NDF was positively correlated (P < 0.004) with the mean sieve aperture estimated to retain 50% of the fragments between successive sieve apertures (MRA). Degradation rate of potentially degradable NDF (PDF) and level of indigestible NDF were not related (P > 0.10) to MRA of masticated and ground fragments. Estimates of tau were positively related to MRA, with slopes of bermudagrass < corn silage < ruminal fragments of corn silage. It was concluded that fragment size-, and consequently, ruminal age-dependent onset of PDF degradation of a mixture of different fragment sizes results in an age-dependent rate of degradation of the more rapidly degrading of two subentities of PDF. Models are proposed that assume a tau before onset of simultaneous degradation of PDF from two pools characterized as having gamma-modeled age-dependency and age-constant rates. The ruminal age-dependent pool seems to be associated with the faster-degrading pool, and its rate parameter increases with range in MRA in the population of fragments. Conceptually, the ruminal age-dependent rate parameter for PDF degradation seems to represent a composite of several effects: 1) effects of the size-dependent tau; 2) range in MRA of the population of ingestively masticated fragments; and 3) subentities of PDF that degrade via more rapid age-dependent rates compared with subentities of PDF that degrade via age-constant rates. The estimated fractional rates of ruminative comminution of ingestively masticated fragments (0.060 to 0.075/h) were of a magnitude similar to the mean fractional rates of PDF digestion (0.030 to 0.085/h), which implies that ruminative comminution may be first-limiting to fractional rate of PDF digestion. The in vivo roles of ingestive and ruminative mastication of fragments on PDF degradation must be considered in any kinetic system for estimating PDF digestion in the rumen. These results and others in the literature suggest that the rate of surface area exposure rather than intrinsic chemical attributes of PDF may be first-limiting to degradation rate of PDF in vivo. 相似文献
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以国际标准强毒Ｒ株人工感染非免疫产蛋鸡,定时扑杀,分别从鼻窦、眶下孔、气管、肺、气囊、卵巢和输卵管分离ＭＧ,并收集感染鸡所产蛋分离ＭＧ。结果表明,人工感染４８小时后上、下呼吸道及肺已被全面感染,９６小时气囊已被感染,１２０小时输卵管已能分离到ＭＧ,卵巢始终分离不到ＭＧ。人工感染鸡自１４４小时便能在其所产蛋中分离出ＭＧ。药物治疗能在７２小时内消除感染,油乳剂苗则需２４天后逐渐降低蛋内ＭＧ分离率,药物卵内注射、种蛋药浴、高温处理均能杀死卵内ＭＧ,但以研制的种蛋浸泡剂药浴效果为最好。 相似文献
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乳酸杆菌作为益生菌广泛用于人和动物.本文综述了乳酸杆菌改善宿主健康的机制.乳酸杆菌可通过产生抗菌物质如乳酸、过氧化氢、细菌素,或者通过竞争营养或肠道黏附位点来抑制致病菌;通过诱导黏附素的分泌或阻止细胞凋亡而增强肠道的屏障功能,从而保护肠道.文章重点讨论了乳酸杆菌表面成分(表面蛋白、脂磷壁酸和肽聚糖)与肠道受体(C型凝集素受体、Toll样受体和Nod样受体),阐述了他们结合后启动免疫调节信号,调控肠道免疫功能以发挥改善健康作用的机制. 相似文献
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REASONS FOR PERFORMING STUDY: Centesis of the bicipital bursa using an 8.9 cm long spinal needle has been reported but the alternative of employing a 3.8 cm long hypodermic needle requires validation. OBJECTIVE: To compare the efficacy of 2 different methods of centesis of the bicipital bursa and to evaluate the usefulness of ultrasonographic imaging to determine the location of solution administered when centesis of the bursa is attempted. METHODS: For Trial 1, 6 clinicians, who had no previous experience of centesis of the bicipital bursa, attempted to inject a solution composed of an aqueous radiopaque contrast medium and physiological saline solution (PSS) into the bicipital bursae of 2/12 horses using the previously described distal approach to inject one bursa and a proximal approach to inject the contralateral bursa. The bicipital tendon and bursa were examined ultrasonographically before and after injection; and both shoulders were examined radiographically to identify the location of the medium. In Trial 2, another 6 clinicians, also with no previous experience of centesis, repeated Trial 1, using 6 horses, but the radiopaque contrast medium was mixed with air instead of PSS. RESULTS: Accuracy of centesis using the proximal approach was 39% and that of the distal approach 28%. Ultrasonographic examination of the shoulder allowed the location of solution and air to be accurately predicted in all 12 shoulders examined. CONCLUSIONS: Clinicians who have had no previous experience performing centesis of the bicipital bursa are unlikely to be successful in centesis using either approach. Radiographic examination after injecting a radiopaque contrast medium may be necessary to assess the success of centesis especially if bursal fluid is not obtained during centesis. Injecting air along with the radiopaque contrast medium provides more accurate ultrasonographic confirmation of centesis and better radiographic definition than does injection without air. 相似文献