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1.
高效液相色谱法测定饲料中三聚氰胺   总被引:1,自引:0,他引:1  
采用高效液相色谱法测定饲料中三聚氰胺含量。色谱柱为Waters Xterra柱(4.6mm×150mm,5μm);流动相为乙腈:10mmol/L辛烷磺酸钠-柠檬酸缓冲液(10∶90,V∶V),检测波长为240nm,流速1.0mL/min,进样量20μL,保留时间约6.23min。三聚氰胺在1.0~50μg/mL范围内具有良好的线性关系(R2=0.99996),在添加浓度为20~100mg/kg范围内,三聚氰胺添加回收率在90%~95%,RSD小于5%。  相似文献   

2.
陈明  汤宇  邵明诚  郑勤 《蜜蜂杂志》2010,30(1):9-11
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。  相似文献   

3.
采用HPLC法测定氨苄西林钠可溶性粉中氨苄西林的含量.色谱柱为WaterssphericalC18(3.9mm×150mm,5μm),流动相为水-乙腈-1mol/L磷酸二氢钾溶液-1mol/L醋酸溶液(909∶80∶10∶1,V/V),检测波长254nm,流速1.0mL/min,柱温30℃,保留时间约4.5min.氨苄西林在0.25~2.0mg/mL范围内具有良好的线性关系(r=0.9999),平均回收率99.6%,RSD为0.3%.  相似文献   

4.
本文建立了测定中药散剂中氯霉素含量的高效液相色谱分析方法。中药样品经乙酸乙酯-正己烷(1∶4)溶液提取,然后用稀盐酸溶液萃取,萃取液经SCX固相萃取小柱净化后测定。色谱柱:Kromasil-C18,150 mm×4.6 mm,5μm;流动相:甲醇+水(20∶80);流速:1.0 mL/min;进样体积:20μL;柱温:30℃;检测波长:278 nm。用高效液相色谱仪测定,外标法定量,氯霉素的检出限为0.2 mg/kg。在添加浓度5~20mg/kg范围内,氯霉素的添加回收率为80.6%~96.3%,批内RSD为1.91%~5.03%,批间RSD为2.03%~6.41%。氯霉素峰面积(y)与溶液浓度(x)在0.5~10μg/mL范围内呈良好的线性关系,线性回归系数大于0.999。  相似文献   

5.
高效液相色谱法测定盐酸林可霉素注射液的含量   总被引:1,自引:0,他引:1  
建立盐酸林可霉素注射液含量测定的高效液相色谱法。色谱柱:C_(18)色谱柱(4.6 mm×250 mm,5μm),流动相:0.05 mol/L硼砂溶液(用85%磷酸溶液调节pH值至5.0)∶甲醇∶乙腈=67∶33∶2(V/V),流速:1 mL/min,检测波长:214 nm,进样量:10μL,柱温:30℃。盐酸林可霉素浓度在0.1-2 mg/m L范围内峰面积与浓度的线性关系良好(R~2=0.999 9)。此法简便、快捷、灵敏度高、重现性好。  相似文献   

6.
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   

7.
本试验旨在建立利用高效液相色谱同时测定瘤胃液中几种水溶性维生素的方法。取瘤胃液,用正己烷、偏磷酸萃取后,其上清液用氮气吹干浓缩(40℃),以流动相A溶解。色谱条件:SBC8色谱柱,粒径5μm,4.6 mm×150 mm;流动相A,V甲醇∶V0.05 mol/L磷酸三钠(pH=2.5)=7∶93;流动相B,V甲醇∶V0.05 mol/L磷酸三钠(pH=2.5)=90∶10;流速1.0 mL/min;检测波长245 nm。结果表明:1)该方法对烟酰胺、烟酸、叶酸、核黄素和氰钴胺素的最小检出质量浓度分别为12.90、12.00、74.11、24.00、9.57 ng/mL(信噪比=3),线性回归相关系数分别为0.999 9、0.999 3、0.990 3、0.999 0、0.999 5;2)瘤胃液样品中加标烟酰胺、烟酸、叶酸、核黄素和氰钴胺素的平均回收率分别为97.5%、96.8%、73.2%、84.4%、89.1%,相对标准偏差分别为2.9%、3.0%、15.6%、7.8%、5.0%。由此得出,本方法适用于同时测定瘤胃液中烟酰胺和烟酸的含量。  相似文献   

8.
研究建立蜂蜜中氟哌酸残留量的反相离子对高效液相色谱测定方法.样品用水相提取,经C18固相萃取柱净化,在273 nm波长下用二极管矩阵检测器检测.色谱柱为Agilent ZORBOX SBC18柱(4.6 mm×250 mm,5μm),流动相为甲醇/磷酸盐缓冲液(0.05 mol/L磷酸二氢钾)/四丁基溴化胺(0.05 mol/L)=24/73/3(V/V/V),用磷酸调节pH=2.75.流速1.0 ml/min.氟哌酸浓度在0.3~4.0μg/ml范围内与峰面积呈良好的线性关系,平均回收率为81.3%~94.7%,变异系数为1.52%~3.31%,最低检测限为0.1μg/ml.本方法简便、快速、准确.  相似文献   

9.
本实验建立了高效液相色谱法(HPLC)测定饲料中癸氧喹酯含量的方法。该方法采用C18色谱柱(250 mm×4.6 mm,粒径5μm),以0.025 mol/L氯化钙溶液+甲醇(15∶85,V/V)为流动相,激发波长为326 nm,发射波长为384 nm,流速为1.0 mL/min,外标法定量。结果表明,该方法最低检测限为0.5 mg/kg,癸氧喹酯的浓度为0.02~2.0 mg/L时,峰面积与浓度线性关系良好(r=0.99994),平均回收率在80%以上,变异系数小于10%,稳定性、重现性好,可用于饲料中癸氧喹酯的含量测定。  相似文献   

10.
采用HPLC法同时测定复方磺胺间甲氧嘧啶钠溶液中磺胺间甲氧嘧啶钠和甲氧苄啶的含量。色谱柱为Kromasil C18柱(250 mm×4.6 mm,粒径5μm),流动相为0.02 mol/L磷酸溶液-甲醇(80∶20,V/V),检测波长270 nm,流速1.0 mL/min,柱温30℃。在10~500μg/mL浓度范围内,磺胺间甲氧嘧啶钠和甲氧苄啶均呈线性关系。平均回收率分别为99.25%和99.76%。该法准确可行,适用于同时检测复方磺胺间甲氧嘧啶钠溶液中磺胺间甲氧嘧啶钠和甲氧苄啶的含量。  相似文献   

11.
试验选用96头平均体重14.82 kg左右的杜×长×大断奶仔猪,随机分成4组,每组3栏,每栏8头(公母各半)。对照组饲喂基础日粮,试验1、2、3组分别添加1%80目白术、0.2%白术多糖和1%微米白术。试验期30 d。结果表明:在生长性能方面,与对照组相比,1%微米白术添加组可显著提高日增重(P0.05)、降低饲料增重比和腹泻率,而且效果优于1%80目白术组和0.2%白术多糖组,在肠道形态和肠道微生态区系方面,与对照组相比,日粮添加1%80目白术、0.2%白术多糖、1%微米白术均可不同程度的提高十二指肠和空肠的绒毛高度,加深十二指肠和空肠的隐窝深度,并且增加肠道微生态区系的多样性,其中以1%微米白术添加组的效果最佳。  相似文献   

12.
Human and equine athletes are reported to have a high prevalence of gastric disease, and anecdotal evidence suggests a similar phenomenon applies to racing sled dogs. To investigate the prevalence of gastric disease in racing sled dogs, we conducted 2 gastroscopy studies on dogs competing in the annual Iditarod Sled Dog Race. A pilot study of dogs that were either dropped from the 2000 Iditarod Sled Dog Race because of illness or that finished the race indicated that, approximately 5 days after competing, 10 of 28 dogs (35%) had endoscopic evidence of gastric ulceration, erosion, or hemorrhage. The next year, an endoscopic study of 73 dogs participating in the 2001 Iditarod race was performed in order to evaluate a larger population of dogs. Data from 70 of these dogs could be used; 34 (48.5%) had ulceration, erosion, gastric hemorrhage, or some combination of these findings. When this group of 70 dogs was compared retrospectively to a control group of 87 dogs presented to the Texas A&M University (TAMU) Veterinary Medical Teaching Hospital, the Iditarod sled dogs had a significantly higher prevalence (P = .049) of gastric lesions. These findings suggest that, similar to athletes of other species, elite canine athletes have an increased prevalence of gastric disease compared to the canine population at large.  相似文献   

13.
Sissay, M.M., Uggla, A. and Waller, P.J., XXXX. Prevalence and seasonal incidence of nematode parasites and fluke infections of sheep and goats in eastern Ethiopia. Tropical Animal Health and Production, XXXX. A 2-year abattoir survey was carried out to determine the prevalence, abundance and seasonal incidence of gastro-intestinal (GI) nematodes and trematodes (flukes) of sheep and goats in the semi-arid zone of eastern Ethiopia. During May 2003 to April 2005, viscera including liver, lungs and GI tracts were collected from 655 sheep and 632 goats slaughtered at 4 abattoirs located in the towns of Haramaya, Harar, Dire Dawa and Jijiga in eastern Ethiopia. All animals were raised in the farming areas located within the community boundaries for each town. Collected materials were transported within 24 h to the parasitology laboratory of Haramaya University for immediate processing. Thirteen species belonging to 9 genera of GI nematodes (Haemonchus contortus, Trichostrongylus axei, T. colubriformis, T. vitrinus, Nematodirus filicollis, N. spathiger, Oesophagostomum columbianum, O. venulosum, Strongyloides papillosus, Bunostomum trigonocephalum, Trichuris ovis, Cooperia curticei and Chabertia ovina), and 4 species belonging to 3 genera of trematodes (Fasciola hepatica, F. gigantica, Paramphistomum {Calicohoron} microbothrium and Dicrocoelium dendriticum) were recorded in both sheep and goats. All animals in this investigation were infected with multiple species to varying degrees. The mean burdens of adult nematodes were generally moderate in both sheep and goats and showed patterns of seasonal abundance that corresponded with the bi-modal annual rainfall pattern, with highest burdens around the middle of the rainy season. In both sheep and goats there were significant differences in the mean worm burdens and abundance of the different nematode species between the four geographic locations, with worm burdens in the Haramaya and Harar areas greater than those observed in the Dire Dawa and Jijiga locations. Similar seasonal variations were also observed in the prevalence of flukes. But there were no significant differences in the prevalence of each fluke species between the four locations. Overall, the results showed that Haemonchus, Trichostrongylus, Nematodirus, Oesophagostomum, Fasciola and Paramphistomum species were the most abundant helminth parasites of sheep and goats in eastern Ethiopia.  相似文献   

14.
1-(2-Chloroethyl)3-cyclohexyl-1-nitrosourea (CCNU) is an alkylating agent in the nitrosourea subclass. A prospective evaluation of CCNU was done to determine the maximally tolerated dosage of CCNU in tumor-bearing cats. Response data were obtained when available. Twenty-five cats were treated with CCNU at a dosage of 50-60 mg/m3 body surface area. Complete hematologic data were available for 13 cats. Neutropenia was the acute dose-limiting toxicity. The median neutrophil count at the nadir was 1,000 cells/microL (mean, 2,433 cells/microL; range, 0-9,694 cells/microL). The time of neutrophil nadir was variable, occurring 7-28 days after treatment, and counts sometimes did not return to normal for up to 14 days after the nadir. Based on these findings, a 6-week dosing interval and weekly hematologic monitoring after the 1st treatment with CCNU are recommended. The nadir of the platelet count may occur 14-21 days after treatment. The median platelet count at the nadir was 43,500 cells/microL. No gastrointestinal, renal, or hepatic toxicities were observed after a single CCNU treatment, and additional studies to evaluate the potential for cumulative toxicity should be performed. Five cats with lymphoma and 1 cat with mast cell tumor had measurable responses to CCNU. Phase II studies to evaluate antitumor activity should be completed with a dosing regimen of 50-60 mg/m3 every 6 weeks.  相似文献   

15.
The purpose of this study was to determine the frequency of different tumor types within a large cohort of cats with intracranial neoplasia and to attempt to correlate signalment, tumor size and location, and survival time for each tumor. Medical records of 160 cats with confirmed intracranial neoplasia evaluated between 1985 and 2001 were reviewed. Parameters evaluated included age, sex, breed, FeLV/FIV status, clinical signs, duration of signs, number of tumors, tumor location(s), imaging results, treatment, survival times, and histopathologic diagnosis. Most of the cats were older (11.3 +/- 3.8 years). Primary tumors accounted for 70.6% of cases. Metastasis and direct extension of secondary tumors accounted for only 5.6 and 3.8% of cases, respectively. Twelve cats (7.5%) had 2 or more discrete tumors of the same type, whereas 16 cats (10.0%) had 2 different types of intracranial tumors. The most common tumor types were meningioma (n = 93, 58.1%), lymphoma (n = 23, 14.4%), pituitary tumors (n = 14, 8.8%), and gliomas (n = 12, 7.5%). The most common neurological signs were altered consciousness (n = 42, 26.2%), circling (n = 36, 22.5%), and seizures (n = 36, 22.5%). Cats without specific neurological signs were common (n = 34, 21.2%). The tumor was considered an incidental finding in 30 (18.8%) cats. In addition to expected relationships (eg, meninges and meningioma, pituitary and pituitary tumors), we found that lesion location was predictive of tumor type with diffuse cerebral or brainstem involvement predictive of lymphoma and third ventricle involvement predictive of meningioma.  相似文献   

16.
Continuous rate infusion (CRI) of furosemide in humans is considered superior to intermittent administration (IA). This study examined whether furosemide CRI, compared with IA, would increase diuretic efficacy with decreased fluid and electrolyte fluctuations and activation of the renin-angiotensin-aldosterone system (RAAS) in the horse. Five mares were used in a crossover-design study. During a 24-hour period, each horse received a total of 3 mg/kg furosemide by either CRI (0.12 mg/kg/h preceded by a loading dose of 0.12 mg/kg IV) or IA (1 mg/kg IV q8h). There was not a statistically significant difference in urine volume over 24 hours between methods; however, urine volume was significantly greater after CRI compared with IA during the first 8 hours ([median 25th percentile, 75th percentile]: 9.6 L [8.9, 14.4] for CRI versus 5.9 L [5.3, 6.0] for IA). CRI produced a more uniform urine flow, decreased fluctuations in plasma volume, and suppressed renal concentrating ability throughout the infusion period. Potassium, Ca, and Cl excretion was greater during CRI than IA (1,133 mmol [1.110, 1,229] versus 764 mmol [709, 904], 102.7 mmol [96.0, 117.2] versus 73.3 mmol [65.0, 73.5], and 1,776 mmol [1,657, 2.378] versus 1,596 mmol [1,457, 1,767], respectively). Elimination half-lives of furosemide were 1.35 and 0.47 hours for CRI and IA, respectively. The area under the excretion rate curve was 1,285.7 and 184.2 mL x mg/mL for CRI and IA, respectively. Furosemide CRI (0.12 mg/kg/h) for 8 hours, preceded by a loading dose (0.12 mg/kg), is recommended when profound diuresis is needed acutely in horses.  相似文献   

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Genetic variations in chromosome Y are enabling researchers to identify paternal lineages, which are informative for introgressions and migrations. In this study, the male‐specific region markers, sex‐determining region‐Y (SRY), amelogenin (AMELY) and zinc finger (ZFY) were analysed in seven Turkish native goat breeds, Angora, Kilis, Hair, Honaml?, Norduz, Gürcü and Abaza. A SNP in the ZFY gene defined a new haplotype Y2C. All domestic haplogroups originate from Capra aegagrus, while the finding of Y1A, Y1B, Y2A and Y2C in 32, 4, 126 and 2 Turkish domestic goats, respectively, appears to indicate a predomestic origin of the major haplotypes. The occurrence of four haplotypes in the Hair goat and, in contrast, a frequency of 96% of Y1A in the Kilis breed illustrate that Y‐chromosomal variants have a more breed‐dependent distribution than mitochondrial or autosomal DNA. This probably reflects male founder effects, but a role in adaptation cannot be excluded.  相似文献   

20.
The occurrence of ectoparasites in sheep flocks is frequently reported but seldom quantified. Sheep production used to be a predominantly family activity in the state of Sa~o Paulo (Brazil), but it began to become a commercial activity in the past decade. Thus, information about the ectoparasites existing in sheep flocks has become necessary. The present data were obtained by means of questionnaires sent to all sheep breeders belonging to the `Associaça~o Paulista de Criadores de Ovinos' (ASPACO; Sa~o Paulo State Association of Sheep Breeders). Response reliability was tested by means of random visits paid to 10.6% of the respondents. Most of the properties (89.5%) reported the presence of one or more ectoparasites. Screw-worm (Cochliomyia hominivorax) was the most frequent ectoparasite (72.5%), followed by bot fly larvae (Dermatobia hominis, 45.0%), ticks (Amblyomma cajennense) and Boophilus microplus, 31.3%) and finally lice (Damalinia ovis, 13.8%). Combined infestations also occurred, the most common one being screw-worm with bot fly larvae (36.0%) followed by bot fly larvae with ticks (13.9%), screw-worm with ticks (9.3%), bot fly larvae with lice (6.9%), and ticks with lice (5.0%). The most common triple combination was screw-worm, bot fly larvae and ticks (12.8%). Breeds raised for meat or wool were attacked by bot fly larvae and ticks more often than other breeds. Lice were only absent from animals of indigenous breeds. The relationships among these ectoparasites are discussed in terms of sheep breeds, flock size, seasonality and the ectoparasitic combinations on the host.  相似文献   

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