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1.
测定盐霉素中间体效价的新方法——分光光度法   总被引：1，自引：0，他引：1  
研究了分光光度法测定发酵液中盐霉素含量的方法.检测波长为520 nm,以无水甲醇为溶剂,3%香草醛溶液为显色剂,显色温度50 ℃,显色时间15 min,盐霉素浓度在20～120 μ/mL范围内与吸光度呈线性关系,相关系数0.999 9(n=6),回收率为100.1%,RSD为0.519%(n=9).  相似文献   

2.
研究了分光光度法测定发酵液中盐霉素含量的方法。检测波长为520nm,以无水甲醇为溶剂,3%香草醛溶液为显色剂,显色温度50℃,显色时间15min,盐霉素浓度在20～120μ／mL范围内与吸光度呈线性关系,相关系数0．9999（n=6）,回收率为100．1％,RSD为0．519％（n=9）。  相似文献   

3.
为了测定阿奇霉素的含量,试验采用高效液相色谱(HPLC)法,以Kromasil C_(18)为色谱柱(250.0 mm×4.6 mm,5.0μm),以0.067 mol/L磷酸二氢铵(三乙胺调p H值为6.5)︰乙腈=70︰30为流动相,流速为1.0 m L/min,用UV230+型紫外-可见波长检测器,检测波长为210 nm,用外标法定量。结果表明:阿奇霉素在1.4~3.4 mg/m L的浓度范围内线性关系良好(r=0.999 8,n=6);样品的平均回收率为100.20%,相对标准偏差(RSD)=0.38%(n=3);样品测定方法重现性的RSD=0.49%(n=6),说明该方法可用于阿奇霉素含量的测定。  相似文献   

4.
饲料中聚醚类抗生素的柱后衍生同时测定方法研究   总被引：1，自引：0，他引：1  
采用高效液相色谱柱后衍生化法同时检测饲料中莫能菌素和盐霉素的含量。试验采用两个柱后衍生反应器,使莫能菌素和盐霉素在柱后分离后与衍生试剂1(硫酸)和衍生试剂2(香草醛)在不同的反应器中先后分别发生反应,经检测莫能菌素和盐霉素的保留时间分别在13min和17min左右。在饲料中添加莫能菌素和盐霉素浓度分别为20、60、120μg/mL时,莫能菌素的平均回收率为93.0%～97.7%,变异系数为1.05%～1.54%;盐霉素的平均回收率为94.0%～96.5%,变异系数为0.78%～1.01%。  相似文献   

5.
高效液相色谱法测定盐霉素预混剂中盐霉素A的含量   总被引：1，自引：1，他引：0  
建立了测定盐霉素预混剂中盐霉素A含量的高效液相色谱分析方法。采用C18色谱柱,甲醇-水-冰醋酸(94︰6︰0.1)等度洗脱,甲醇-硫酸-香草醛(95︰2︰3)为衍生试剂,流速0.7 mL/min;衍生温度98 ℃;检测波长520 nm;进样量20 μL。结果表明,盐霉素A在0.4～0.6 mg/mL范围内线性关系良好（r2=0.9998）,平均回收率100.6%。该方法简便、准确、可行。  相似文献   

6.
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   

7.
笔者利用氨基糖苷类抗生素药物与碱性酒石酸铜试液发生衍生化显色反应的原理,采用比色法测定硫酸新霉素溶液的含量。结果显示,药物浓度在2~12 mg/mL范围内与吸光度呈良好的线性关系,相关系数r=0.9985(n=6),平均回收率为99.5%,RSD为0.5%(n=4)。此方法操作简单、快捷,稳定性较好。  相似文献   

8.
RP-HPLC测定喹烯酮及其制剂的含量   总被引：8，自引：2，他引：6  
采用RPHPLC方法测定喹烯酮及其制剂含量。以SymmetryC1 8柱为固定相 ,甲醇水 (6 0∶40 )为流动相 ,检测波长 3 1 4nm ,喹烯酮在 0 .0 5～ 0 .2 5mg·mL1 浓度范围内呈线性关系(r=0 .9993 ,n =5 ) ,平均回收率 99.89% ,RSD =1 .1 3 (n =5 )。本法简便、快速 ,可用于该产品的质量控制  相似文献   

9.
硫酸安普霉素注射液中硫酸安普霉素含量的测定   总被引：1，自引：0，他引：1  
本研究采用旋光法测定硫酸安普霉素注射液中硫酸安普霉素含量。结果表明：硫酸安普霉素在5～40mg/ml的浓度范围内呈良好的线性关系（r=0.99986,n=5）,回收率为99.6%,RSD：1.0%。说明能够简便、快速、重现性较好的测定硫酸安普霉素注射液（5ml：0.5g（500000IU））中硫酸安普霉素的含量,与药典规定的抗生素微生物检定法测定的结果有较好的可比性。适合药厂对该制剂中间产品的质量控制。  相似文献   

10.
试验将鸡肉样品制成匀浆,用乙酸乙酯提取,正己烷去脂后用乙酸乙酯反萃取,经固相萃取柱(SPE)净化,甲醇洗脱,采用HPLC进行检测。甲砜霉素和氟甲砜霉素在同时检测时的保留时间分别为7.30min和17.60min,测得甲砜霉素与氟甲砜霉素的检测限达10ng/g。在添加浓度为0.005～0.02mg/kg时,平均回收率在65.84%～81.18%之间,相对标准偏差(RSD)在5.6%～13.2%之间(n=5);甲砜霉素、氟甲砜霉素在0.01～1.0mg/L范围内有良好的线性关系。  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.
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   

18.
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   

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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