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1.
对鳗鱼饲料中呋喃唑酮和呋喃西林的高效液相色谱检测方法进行了研究.采用乙腈超声提取药物,正已烷去除杂质,用安捷伦Eclipse XDB-C18 5 μm (4.6 mm×250 mm)色谱柱进行分离,二极管阵列检测器检测,检测波长为365 nm.对鳗鱼饲料进行0.5～5 mg/kg 2种药物的加标回收试验.结果表明:呋喃西林的回收率在61.18%～99.34%,相对偏差为7.75%～9.98%,最低检测限为0.1 mg/kg.  相似文献   

2.
用高效液相色谱法,226nm为检测波长,乙腈作提取液,5mmol/L四丁基溴化铵和5mmol/L磷酸氢二钠溶液（1：1）作水相（pH为7.0）,乙腈作有机相,水相：有机相=91：1,测定进行牛奶中三聚氰酸残留量。结果表明,其检出线为0.5mg/kg;在0.5～50mg/kg范围内,呈线性关系,相关系数r为0.9998;添加浓度为2.0mg/kg、4.0mg/kg、8.0mg/kg的条件下,三聚氰酸的残留回收率在73.5%～99.6%之间,组内、组间变异系数小于10%,均达到了欧盟和我国残留检测的相关规定。  相似文献   

3.
鸡组织中地克珠利和妥曲珠利残留HPLC检测方法的建立   总被引：3，自引：0，他引：3  
建立了同时检测鸡组织中地克珠利和妥曲珠利残留的高效液相色谱.经乙腈提取,正己烷脱脂,旋转蒸发浓缩后,以0.05mol/L磷酸/三乙胺(pH3.0):乙腈(40:60)作为流动相,反相高效液相色谱-紫外检测法检测,检测波长240 nm.鸡组织中地克珠利和妥曲珠利的回收率分别为92.0%～102.0%和83.4%～89.0%,变异系数为5.9%～12.2%,地克殊利和妥曲珠利的检测限分别为0.012 mg/kg和0.010 mg/kg,在0.05～1.0 mg/L质量浓度范围内呈良好的线性相关.该法样品处理简单,可同时检测地克珠利和妥曲珠利的残留,且准确度和精密度均符合残留分析的要求.  相似文献   

4.
建立了以带荧光检测器的液相色谱检测水产品中甲砜霉素、氟甲砜霉素与氟甲砜霉素胺残留的新方法.采用碱性乙酸乙酯-乙腈提取试样中残留的化合物,凝胶渗透色谱(GPC)净化,荧光检测器的激发与发射波长分别为225 nm与295 nm,可疑样品以液相色谱-质谱/质谱进行确证.在添加浓度为0.050～2.0 mg/kg时,平均回收率在86.4%～96.8%之间,相对标准偏差(RSD)在5.63%～9.71%之间(n=5);甲砜霉素、氟甲砜霉素在0.20～5.0 mg/L范围内、氟甲砜霉素胺在0.10～5.0 mg/L范围内有良好的线性关系,甲砜霉素与氟甲砜霉素的检测限达0.020mg/kg、氟甲砜霉素胺的检测限达0.010 mg/kg.  相似文献   

5.
经丙酮、二氯甲烷提取,饱和正己烷脱脂,氮吹仪吹干浓缩后,以乙腈-磷酸二氢钠溶液(0.01 mol/L,含0.005mol/L十二烷基硫酸钠和0.1%三乙胺)(35 :65)为流动相,流速为1.0 mL/min,荧光检测激发波长为225 nm,发射波长285 nm.氟苯尼考在0.01～10.0 mg/L、氟苯尼考胺在0.002 5～2.5 mg/L浓度范围内,本方法线性关系良好,相关系数分别为0.999 7和0.999 8.当添加水平氟苯尼考为15～500 μg/kg、氟苯尼考胺为5～500μg/kg时.该方法平均回收率分别为79.5%～84.6%和80.7 0A～88.2%,相对标准偏差分别为2.8%～6.4%和2.4%～5.3%;检测限分别为5μg/kg和μg/kg.该方法样品处理简单,可同时检测氟苯尼考和氟苯尼考胺的残留,且准确度和精密度均符合残留分析的要求.  相似文献   

6.
高效液相色谱法测定饲料中环丙氨嗪   总被引：6，自引：0，他引：6  
本试验研究建立了用NH2柱和97%乙腈水溶液做流动相洗脱测定饲料中灭蝇胺———环丙氨嗪含量的高效液相色谱法,饲料均质后经20%氨水乙腈溶液重复提取2次、浓缩处理后上机检测,环丙氨嗪标准曲线在0.05～20.0μg/mL线性关系良好,相关系数(R)为0.99995;在饲料中环丙氨嗪含量为3.0～8.0mg/kg时,回收率为87.23%～95.36%,变异系数为3.04%～3.46%。检测限为0.05mg/kg。  相似文献   

7.
将基质固相分散 ( MSPD)与酸碱萃取相结合 ,对组织中的残留物进行净化。反相高效液相色谱( HPLC)测定 ,流动相为乙腈 -0 .0 1 7mol/L磷酸 ( 7 3) ,检测波长 2 90 nm。建立了牛肌肉组织中 4种苯并咪唑类药物的基质固相分散 -高效液相色谱 ( MSPD-HPLC)多残留分析法。在 0 .0 5～ 0 .4 0 mg/kg添加范围内 ,4种苯并咪唑类药物的平均回收率为 ( 6 9.2± 1 2 .4 ) %。本方法检测限为 0 .0 1～ 0 .0 5mg /kg。  相似文献   

8.
本文应用超高效液相色谱-串联质谱技术,建立了饲料中喹烯酮和喹乙醇的检测方法。样品经0.1%甲酸乙腈溶液提取后,通过PRiME HLB固相萃取柱净化;采用0.1%甲酸乙腈溶液作为流动相进行梯度洗脱,经AtlantisT3色谱柱分离,通过多反应监测模式进行测定。在5～500 ng/mL时线性关系良好,相关系数均大于0.996。在0.2、0.4、2 mg/kg添加水平下,平均回收率为80%～95.5%,相对标准偏差均小于10%。检测限为0.06 mg/kg,定量限为0.2 mg/kg,该法准确、简单、快速。  相似文献   

9.
为建立鸡蛋中氯羟吡啶残留的高效液相色谱法,经乙腈提取净化鸡蛋试样中残留的氯羟吡啶,以磷酸盐缓冲溶液-乙腈(85+15)为流动相,采用C18色谱柱,标准曲线在0.025～2μg/mL浓度内呈线性相关,相关系数(R2)为0.9999;在空白鸡蛋样品中添加0.05mg/kg(定量限)、1mg/kg、2.5mg/kg、5mg/kg的氯羟吡啶,回收率为70%～110%,相对标准偏差(RSD)小于10%。该方法简单快速,灵敏度高,重现性好,适合鸡蛋中氯羟吡啶药物残留的测定。  相似文献   

10.
本实验建立了超高效液相色谱-串联四级杆质谱法同时测定饲料中5种聚醚类抗球虫药含量的确认检测方法.试样经乙腈提取、石墨化碳黑固相萃取柱净化后,采用超高效液相色谱-电喷雾串联四极杆质谱法进行分离检测.色谱条件:ACQUITY UPLCTM BEH C18柱(2.1 mm×50 mmi.d.,1.7μm),流动相:甲醇-0.1%甲酸水溶液(85+15),等度洗脱,流速为0.3mL/min.采用正离子模式检测,外标法定量.结果表明,莫能菌素、马杜霉素、盐霉素、甲基盐霉素和拉沙洛西的浓度在1～500 mg/mL范围内线性良好,在10～100 mg/kg的添加水平务件下平均回收率为78.5%～91.2%,该方法的检测限(LOD)为10ug/kg,定量限(LOQ)为20 ug/kg.  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.
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   

13.
Tropical Animal Health and Production -  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.
Our particular attention in this article was given to natural mediators for macrophages isolated from the sites of tissue injury. A number of chemotactic factors, which may satisfy many criteria making them acceptable as inflammatory leucocyte chemotactic factors, has been separated. Among them, our laboratory has isolated three macrophage (monocyte) chemotactic factors (MCF-a, -b and -c). Their purification, characterization and functional specificity are discussed.  相似文献   

16.
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   

17.
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   

18.
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   

19.
The objective of this report was to characterize 20-year changes in proportion of calcium oxalate (CaOx) calculi and struvite calculi in dogs, and associations with breed, age, and sex. In this retrospective study, results of analysis of urinary calculi from dogs were reviewed for specimens received between July 1, 1981, and December 31, 2001. Breed, sex, age, year of submission of the specimen, and mineral type(s) were analyzed statistically. CaOx or Struvite or both were contained in 18,966 of 20,884 (91%) specimens. For both sexes, a 20-year statistically significant increase was observed in the proportion of calculus specimens that contained CaOx. The increase in this proportion was greater in females (1% to 31%) than in males (18% to 82%). From 1998 to 2001, when proportions may have plateaued, the odds of specimens containing CaOx were markedly higher in 18 breeds, markedly lower in 5 breeds, and not significantly different in 13 breeds compared with crossbreds. For both sexes, a 20-year statistically significant decrease was observed in the proportion of calculus specimens that contained struvite. This decrease in proportion was greater for males (79-16%) than for females (97-68%). From 1998 to 2001, when proportions plateaued, the odds of calculi containing struvite were markedly lower in 20 breeds, markedly higher in 1 breed, and not significantly different in 15 breeds when compared with crossbreds. Breed, age, and sex were associated statistically with CaOx or struvite urolithiasis. In conclusion, there appears to have been a long-term increase in the proportion of specimens of canine urinary calculi that contain CaOx as well as a long-term decrease in the proportion of specimens of calculi that contain struvite for both male and female dogs. The rate of change appeared to begin leveling off in the period 1998 to 2001. The recent proportion of dogs with either CaOx- or struvite-associated urolithiasis may depend on breed, age, and sex, and on interactions among these 3 factors.  相似文献   

20.
<正>1.INTRODUCTION Ensuring transportation network security is one Of the most daunting challenges confronting homeland security agencies today.Significant research has been dedicated.To model and analyze the vulnerability of transportation systems,while notably fewer studies propose specific strategies for deploying defensive technologies to safeguard these systems.  相似文献   

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