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In Vitro Metabolism Study of Captafol Using Gas Chromatography
Jang, Won-cheoul 단국대학교 1996 論文集 Vol.30 No.-
이 논문에서는 곰팡이 살균제로 널리 사용되고 있는 captafol이 Aroclor 1254로 처리된 쥐의 간으로부터 준비한 간의 S-9조제에 의하여 대사 되는 것을 가스크로마토그라프에 의하여 정량적으로 분석하였다. Captafol과 THPI의 각각의 농도에서 ethylacetate와 toluene을 사용하여 추출한 회수율을 비교하면 captafol은 회수율은 46, 53%이였고, THPI의 회수율은 84, 65로써 ethylacetate로 추출한 것이 좋았으며 뇨에서의 Captafol과 THPI의 회수율은 각각 평균 69, 67%을 나타내었다. Captafol을 incubation한 시료들은 captafol이 전혀 검출되지 않았으며 이것은 captafol이 가수분해 또는 대사 되었거나 효소에는 결합하지 않는 것으로 추측된다. 이와 같은 대사경로는 captafol의 발암성 및 가능성을 평가하기 위한 자료에 많은 도움을 줄 것으로 사료된다.
Jang, Won-Cheoul,Heo, Gang-Joon Korean Society of ToxicologyKorea Environmental Mu 1996 Toxicological Research Vol.12 No.2
The focus of this study was to investigate the suitable analytical methods for measurement of sulfamerazine and its metabolite in shrimp hepatopancreas and tail tissue, in addition to the methods for the optimization of solid-phase extraction cartridge conditions and the elucidation of sulfamerazine concentrations in aqueous buffer using HPLC with UV and EC detectors. Compared with UV detector the EC detector appears to be 10 times more sensitive than that of the UV detector. After the shrimp was exposed to 10 ppm sulfamerazine, the accumulation levels of sulfamerazine and its metabolite in tail tissue, which is edible portion, were considerably lower than 0.1 ppm. The data indicate that sulfamerazine continues to be a candidate for use at levels of sulfamerazine concentration used in aquaculture of shrimp.
Residue of Clindamycin in the Muscles of Eel and Flounder Infected by Streptococcus sp. by HPLC
Jang, Won-Cheoul,Shim, Sang-Kyun,Heo, Gang-Joon Korean Society of ToxicologyKorea Environmental Mu 1997 Toxicological Research Vol.13 No.3
Residue and recoveries of clindamycin were investigated by reversed-phase high performance liquid chromatography (RP-HPLC) which was infected for the control of streptcoccal infection in Anguilla japonica and Paralichthys olivaceusis. Detection limit was 0.1 ppm. Recoveries of clindamycin in muscles of flounder and eel were 80.4 and 78.8%, respectively. The clindamycin in eel and flounder was detected up to 13 and 15 days after dosing, respectively.
Structural Changes of the spinach Photosystem ⅡReaction Center After Inactivation by Heat Treatment
Won cheoul Jang,Gun Sik Tae 생화학분자생물학회 1996 BMB Reports Vol.29 No.1
The structural changes in the electron donor side of the PSII reaction center have been monitored since heat treatment (45℃ for 5 min) of thylakoids is known to decrease the oxygen evolving activity. In heat-treated spinach chloroplast thylakoids, the inhibitory effect of 3-(3,4-dichlorophenyl)-1,1-dimethylurea (DCMU) on the electron transport activity of the PSII reaction center from diphenyl carbazide to dichlorophenolindophenol became reduced approximately 3.8 times and [^(14)C]-labeled DCMU binding on the D1 polypeptide decreased to 25-~-30% that of intact thylakoid membranes, implying that the conformational changes of the DCMU binding pocket, residing on the D1 polypeptide, occur by heat treatment. The accessibility of trypsin to the NHZ-terminus of the cytochrome b-559 α-subunit, assayed with Western blot using an antibody generated against the synthetic peptide (Arg-68 to Arg-80) of the COOH-terminal domain, was also increased, indicating that heat-treatment caused changes in the structural environments near the stromal side of the cytochrome b-559 α-subunit, allowing trypsin more easily to cleave the NH₂-terminal domain. Therefore, the structural changes in the electron donor side of the PSII reaction center complexes could be one of the reasons why the oxygen evolving activity of the heat-treated thylakoid membranes decreased.
Jang, Won-Cheoul,Tae, Gun-Sik Korean Society for Biochemistry and Molecular Biol 1996 Journal of biochemistry and molecular biology Vol.29 No.1
The structural changes in the electron donor side of the PSII reaction center have been monitored since heat treatment ($45^{\circ}C$ for 5 min) of thylakoids is known to decrease the oxygen evolving activity. In heat-treated spinach chloroplast thylakoids, the inhibitory effect of 3-(3,4-dichlorophenyl)-1,1-dimethylurea (DCMU) on the electron transport activity of the PSII reaction center from diphenyl carbazide to dichlorophenolindophenol became reduced approximately 3.8 times and [$^{14}C$]-labeled DCMU binding on the D1 polypeptide decreased to 25~30% that of intact thylakoid membranes, implying that the conformational changes of the DCMU binding pocket, residing on the D1 polypeptide, occur by heat treatment. The accessibility of trypsin to the $NH_2$-terminus of the cytochrome b-559 ${\alpha}$-subunit, assayed with Western blot using an antibody generated against the synthetic peptide (Arg-68 to Arg-80) of the COOH-terminal domain, was also increased, indicating that heat-treatment caused changes in the structural environments near the stromal side of the cytochrome b-559 ${\alpha}$-subunit, allowing trypsin more easily to cleave the $NH_2$-terminal domain. Therefore, the structural changes in the electron donor side of the PSII reaction center complexes could be one of the reasons why the oxygen evolving activity of the heat-treated thylakoid membranes decreased.
A Simple Method for the Detection and Identification of Korean Brown Cattle(Hanwoo) using DHPLC
Kang. Won,Park. Sane-Bum,Nam. Youn-Hyoung,An. Young-Chang,Lee. Sang-Hyun,Park. Jin-Keun,Lee. Jae-Sik,Jang. On-Cheoul,Park. Su-Min,Park. Yong-Hyun,Ko. Kyung-Hee,Moon. Sung-Sil 한국축산식품학회 2006 심포지움 및 학술발표회 Vol.- No.37
Denaturing high-performance liquid chromatography(DHPLC) is used in a wide variety of genetic applications and is an efficient method for detection of mutations involving one or a few nucleotides. We developed a high-throughput DHPLC method for identifying polymorphisms in the MC1R gene that are characteristic of Hanwoo cattle. We compared 10 tissue samples from Hanwoo cattle, 10 samples from Holstein cattle and 10 samples from Hanwoox Holstein crossbred cattle to determine whether DHPLC analysis can be used to distinguish between these genotypes. Samples obtained from Hanwoo cattle had a unique profile of peaks that could be used as a molecular fingerprint for this breed. We also analyzed two hundred samples in a trial in which we were blinded to the genotype of the samples and correctly identified the breed-of-origin of 594 out of 600 sequence variations(99%).