• Title, Summary, Keyword: Veterinary drug

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Determination of Ceftiofur Residues by Simple Solid Phase Extraction Coupled with Liquid Chromatography-Tandem Mass Spectrometry in Eel, Flatfish, and Shrimp

  • Kim, Joohye;Shin, Dasom;Kang, Hui-Seung;Lee, Eunhye;Choi, Soo Yeon;Lee, Hee-Seok;Cho, Byung-Hoon;Lee, Kang-Bong;Jeong, Jiyoon
    • Mass Spectrometry Letters
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    • v.10 no.2
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    • pp.43-49
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    • 2019
  • The aim of this study was conducted to develop an analytical method to determine the concentration of ceftiofur residue in eel, flatfish, and shrimp. For derivatization and extraction, the sample was hydrolyzed with dithioerythritol to produce desfuroylceftiofur, which was then derivatized by iodoacetamide to obtain desfuroylceftiofur acetamide. For purification, the process of solid phase extraction (Oasis HLB) was used. The target analytes were confirmed and quantified in $C_{18}$ column using liquid chromatography-tandem mass spectrometry with 0.1% formic acid in water (A) and 0.1% formic acid in acetonitrile (B) as the mobile phase. The linearity of the standard calibration curve was confirmed by a correlation coefficient, $r^2>0.99$. The limit of quantification for ceftiofur was 0.002 mg/kg; the accuracy (expressed as the average recoveries) was 80.6-105%; the precision (expressed as the coefficient of variation) was below 6.3% at 0.015, 0.03, and 0.06 mg/kg. The validated method demonstrated high accuracy and acceptable sensitivity to meet the Codex guideline requirements. The developed method was tested using market samples. As a results, ceftiofur was detected in one sample. Therefore, it can be applied to the analysis of ceftiofur residues in fishery products.

Development of Analytical Method and Monitoring of Veterinary Drug Residues in Korean Animal Products

  • Song, Jae-Sang;Park, Su-Jeong;Choi, Jung-Yun;Kim, Jin-Sook;Kang, Myung-Hee;Choi, Bo-Kyung;Hur, Sun Jin
    • Food Science of Animal Resources
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    • v.36 no.3
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    • pp.319-325
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    • 2016
  • This study was conducted to determine the residual amount of veterinary drugs such as meloxicam, flunixin, and tulathromycin in animal products (beef, pork, horsemeat, and milk). Veterinary drugs have been widely used in the rearing of livestock to prevent and treat diseases. A total of 152 samples were purchased from markets located in major Korean cities (Seoul, Busan, Incheon, Daegu, Daejeon, Gwangju, Ulsan and Jeju), including Jeju. Veterinary drugs were analyzed by liquid chromatography-tandem mass spectrometry according to the Korean Food Standards Code. The resulting data, which are located within 70-120% of recovery range and less than 20% of relative standard deviations, are in compliance with the criteria of CODEX. A total of five veterinary drugs were detected in 152 samples, giving a detection rate of approximately 3.3%; and no food source violated the guideline values. Our result indicated that most of the veterinary drug residues in animal products were below the maximum residue limits specified in Korea.

A Novel Approach of Drug Delivery via Intrascleral Implantation of Latanoprost Imbedded Disk

  • Moon, Soo-Jin;Seo, Min-Soo;Kang, Kyung-Ku;Sung, Soo-Eun;Yun, Sungho;Kwon, Young-Sam
    • Journal of Veterinary Clinics
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    • v.36 no.4
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    • pp.212-218
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    • 2019
  • This study evaluates the drug delivery and biocompatibility of latanoprost imbedded disk in rabbit eye by assessing pharmacokinetics (PK), clinical signs, and histopathologic findings. During 84 days of experimental period, 48 New Zealand Rabbit (NZW) eyes were divided into control group which received no treatment and test material group which latanoprost were implanted intrasclerally. Pharmacokinetic assessment was performed to evaluate the drug delivery for 3 months. For biocompatibility, clinical signs were observed and histopathological analysis was done at 3 months post-operatively. The concentration of latanoprost in the iris tissue was maintained during the experimental period and the highest level of latanoprost was found at 4 weeks. However, the latanoprost was not found in the aqueous humor. Macroscopically, there was no evidence of clinical signs except for temporary hyperemia, neovascularization and edema immediately after surgery. On histopathological examination, there were no abnormal findings such as hyperemia, neovascularization, and edema in the eye tissues. The latanoprost imbedded disks has effectively released the drug into the adjacent tissue with high compatibility. Therefore, this study suggests that the drug delivery system with intrascleral latanoprost imbedded implants might be a novel approach as a treatment option for glaucoma.

The reasons of drug residues in bulk milk (원유내 약물잔류의 원인에 관한 연구)

  • Kang, Jeong-hun;Kim, Jin-suk;Choi, Pill-su;Lee, Won-chang
    • Korean Journal of Veterinary Research
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    • v.39 no.6
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    • pp.1180-1186
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    • 1999
  • The 102 farms received a positive result of the bulk milk drug residue test were selected to investigate the reasons of drug residues in bulls milk. The most frequent causes of drug residues were milker or producer mistakes (28.4%), failure to observe withdrawal time (21.5%), and withholding milk from treated quarters only (19.6%). Milker or producer mistakes occurred high at the farms having a parlor system (4 cases out of 11 farms), and related to the inadequate records and marking of treated cows. The lack of knowledge on the absorption of antibiotic from treated quarters and its excretion from untreated quarters caused mainly withholding milk from treated quarters only. Among the 91 farms identified the cause of drug residues, most of the route of drug administration was intramammary infusion (81.3%), and mostly drug used for the treatment of cows was ${\beta}$-lactam antibiotic (57.1%)

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Malignant Schwannoma in F344 Rat

  • Kim, Bang-hyun;Nam, Ki-taek;Han, Beom-seok;Park, Ki-dae;Cho, Wan-seob;Jang, Dong-deuk;Lee, Kook-kyung;Kim, Dae-yong;Yang, Ki-hwa
    • Proceedings of the Korean Society of Veterinary Pathology Conference
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    • pp.8-8
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    • 2003
  • Schwannoma is a neoplasm of the Schwann cells of the neural sheath [1]. Malignant schwannoma is most commonly seen in the subcutis of the flank or neck area near the salivary glands [2]. It also occurs in the thoracic and abdominal cavities, spinal cord, cranial cavity, the heart, etc. Here, we incidentally found a good case of malignant schwannoma in the subcutis of the lumbar and lumbosacral region in male F344 rat during the carcinogenicity study with diisodecyl phthalate (DIDP). Therefore, we tried to report this case as a good reference of malignant schwannoma. (omitted)

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The anti-parasitic efficacy of ivermectin and pyrantel pamoate compound against canine Toxocara canis and Trichuris vulpis

  • Youn, Heejeong;Ra, Jeong Chan;Kim, Byung Ki;Bae, Bokyoung;Lim, Yong Suk;Kim, Kyong Hee;Lee, Kyong-Eun
    • Korean Journal of Veterinary Research
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    • v.51 no.4
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    • pp.289-295
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    • 2011
  • Toxocara (T.) canis and Trichuris (T.) vulpis are very important canine parasitic nematodes. T. canis parasitize in small intestine and T. vulpis parasitize in large intestine. In order to control of these nematodes, ivermectin and pyrantel pamoate compound was applied to the dogs infected with these parasites naturally and artificially. This drug was composed of $68.0{\mu}g$ of ivermectin and 57.0 mg of pyrantel pamoate for small animal, $136.0{\mu}g$ of ivermectin and 114.0 mg of pyrantel pamoate for middle animal, and $272.0{\mu}g$ of ivermectin and 227.0 mg of pyrantel pamoate for large animal. Ivermectin in this drug is activity to nematodes and ectoparisites. Pyrantel pamoate in this drug is also activity to nematodes. In this experiment, this drug had a good efficacy against T. canis and T. vulpis in the infected dogs.

Molecular phylogenetic studies on clinical bovine piroplasmosis caused by benign Theileria in Shaanxi Province, China

  • Wang, Jing;Zhang, Jiyu;Zhu, Zhen;Zhou, Xuzheng;Li, Bing
    • Journal of Veterinary Science
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    • v.19 no.6
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    • pp.846-849
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    • 2018
  • A group of benign Theileria species, which are often referred to as T. orientalis/T. buffeli/T. sergenti group, has low pathogenicity in cattle. Herein, we report on Theileria spp. in cattle on a farm from China. Based on phylogenetic analysis of the major piroplasm surface protein gene sequences, we detected 6 genotypes that were categorized as Types 1, 2, 3, 4, and 5 as well as an additional Type 9 genotype. The new epidemiological features of the T. orientalis/T. buffeli/T. sergenti parasites in China indicate a greater diversity in the genetics of these species than had been previously thought.

Monitoring and Risk Assessment of Pesticide Residues for Circulated Agricultural Commodities in Korea-2013 (국내 유통 농산물의 잔류농약 모니터링 및 위해평가-2013년)

  • Kim, Jae-Young;Lee, Sang-Mok;Lee, Han-Jin;Chang, Moon-Ik;Kang, Nam-Sook;Kim, Nam-Sun;Kim, Heejung;Cho, Yoon-Jae;Jeong, Jiyoon;Kim, Mee Kyung;Rhee, Gyu-Seek
    • Journal of Applied Biological Chemistry
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    • v.57 no.3
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    • pp.235-242
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    • 2014
  • The purpose of this study is the establishment of scientific processes for making food safety policies. Thus, we investigated pesticide residue level of the agricultural commodities from market, and performed risk assessment. Fifteen agricultural items are chosen based on the frequency of Korean consumption. The samples were collected from 9 cities where populations are more than one million. Total 283 active ingredients were monitoring ( total sample number =232). Single-analysis of target pesticides was for three kinds of possible growth regulators and the multicomponent analysis was for 280 kinds of pesticides, a total of 283 species were selected to perform the pesticide residues. Before monitoring the analytes, the improvements of the analytical methods were done by method validations under the CODEX analytical method development guidelines and can produce metrics that represent the international standards applied in accordance with the guidelines. In addition to residual pesticides detected during monitoring we compare the ADI to EDI values using detected result and dietary consumption data which is extracted from annual market basket survey. The 163 samples were non-detected in the total 232 samples so it means that every agricultural commodity will residual pesticides-free in 70.3%. The detected residual pesticides showed for a total of 69 cases (29.7%). Two of samples violate Korean MRL (0.9%). The ratio of EDI compared to ADI resulted in only from 0.00087 to 0.902%. In result, we can assume that all detected residual pesticides are very safe level and current policies of Korean pesticides control may be working.

Establishment of Analytical Method for Dichlorprop Residues, a Plant Growth Regulator in Agricultural Commodities Using GC/ECD (GC/ECD를 이용한 농산물 중 생장조정제 dichlorprop 잔류 분석법 확립)

  • Lee, Sang-Mok;Kim, Jae-Young;Kim, Tae-Hoon;Lee, Han-Jin;Chang, Moon-Ik;Kim, Hee-Jeong;Cho, Yoon-Jae;Choi, Si-Won;Kim, Myung-Ae;Kim, MeeKyung;Rhee, Gyu-Seek;Lee, Sang-Jae
    • Korean Journal of Environmental Agriculture
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    • v.32 no.3
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    • pp.214-223
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    • 2013
  • BACKGROUND: This study focused on the development of an analytical method about dichlorprop (DCPP; 2-(2,4-dichlorophenoxy)propionic acid) which is a plant growth regulator, a synthetic auxin for agricultural commodities. DCPP prevents falling of fruits during their growth periods. However, the overdose of DCPP caused the unwanted maturing time and reduce the safe storage period. If we take fruits with exceeding maximum residue limits, it could be harmful. Therefore, this study presented the analytical method of DCPP in agricultural commodities for the nation-wide pesticide residues monitoring program of the Ministry of Food and Drug Safety. METHODS AND RESULTS: We adopted the analytical method for DCPP in agricultural commodities by gas chromatograph in cooperated with Electron Capture Detector(ECD). Sample extraction and purification by ion-associated partition method were applied, then quantitation was done by GC/ECD with DB-17, a moderate polarity column under the temperature-rising condition with nitrogen as a carrier gas and split-less mode. Standard calibration curve presented linearity with the correlation coefficient ($r^2$) > 0.9998, analysed from 0.1 to 2.0 mg/L concentration. Limit of quantitation in agricultural commodities represents 0.05 mg/kg, and average recoveries ranged from 78.8 to 102.2%. The repeatability of measurements expressed as coefficient of variation (CV %) was less than 9.5% in 0.05, 0.10, and 0.50 mg/kg. CONCLUSION(S): Our newly improved analytical method for DCPP residues in agricultural commodities was applicable to the nation-wide pesticide residues monitoring program with the acceptable level of sensitivity, repeatability and reproducibility.