• Title, Summary, Keyword: oxime derivatization

Search Result 3, Processing Time 0.04 seconds

Evaluation of Testosterone Metabolites/Dehydroepiandrosterone As the Indicators of Testosterone Administration in Horse Doping (경주마 약물검사에서 testosterone 투여 여부표지자로서의 testosterone 대사체들에 대한 dehydroepiandrosterone의 비율 평가)

  • Kim, Jin Young;Choi, Man Ho;Kim, Sung Jean;Kyong, Jin Burm;Chung, Bong Chul
    • Analytical Science and Technology
    • /
    • v.12 no.3
    • /
    • pp.190-195
    • /
    • 1999
  • The metabolism of testosterone ($17{\beta}$-hydroxy-androst-4-en-3-one) was confirmed in horse after a single intramuscular administration of testosterone cypionate (750 mg). Solvent extracts of urine obtained with enzymatic hydrolysis and methanolysis were analyzed by GC/MS after oxime t-butyldimethylsilyl (oxime-TBDMS) derivatization. The structures of four urinary metabolite after testosterone administration in horse were determined based on EI mass spectra and $5{\alpha}$-androstane-$3{\beta}$, $17{\alpha}$-diol and $5{\alpha}$-androstane-$3{\beta}$-ol-17-one as major was confirmed with authentic standard. Also the concentrations of $5{\alpha}$-androstane-$3{\beta}$, $17{\alpha}$-diol, $5{\alpha}$-androstane-$3{\beta}$, $17{\beta}$-diol, dehydroepiandrosterone (DHEA), $5{\alpha}$-androstane-$3{\beta}$-ol-17-one and testosterone were determined in the urine of normal subjects and the urine after administration. The recovery and detection limit in the most drugs were 86.3~94.7% and 1~3 ppb, respectively. Correlation coefficients for calibration were in the range of 0.984~0.999. Excretion profile of testosterone presents the rapid and large increasement up to maximum values at days 5 after administration and the slow regression. The relative ratios of testosterone, its metabolites over DHEA were determined for indication of testosterone administration in horse doping.

  • PDF

Analysis of Formaldehyde and Acetaldehyde in Alcoholic Beverage (유통 주류의 포름알데히드 및 아세트알데히드 함량분석)

  • Park, Young-Seok;Lee, Yun-Jeung;Lee, Ki-Teak
    • Journal of the Korean Society of Food Science and Nutrition
    • /
    • v.35 no.10
    • /
    • pp.1412-1419
    • /
    • 2006
  • Concentrations of formaldehyde and acetaldehy de were respectively analysed in forty-five alcoholic beverages obtained from the market. After derivatization with PFBHA, GC-ECD and GC-MSD were employed for analysis. The peak area of aldehyde oximes (derivatives with PFBHA) increased with the increasing ethanol content (5%, 10%, 15%, 20% and 40%). When three-point calibration corves for the selected ethanol concentration (5, 13, 21 and 40%, v/v) were studied, suitable linearity against ethanol concentration was observed only under 5, 13, and 21% (ethanol, v/v). After analysis, maximum content of formaldehyde (average of 0.272 ppm) and acetaldehyde (average of 15.262 ppm) among the observed 45 alcoholic beverages was found from whisk (2 species) while minimum content of formaldehyde (average of 0.009 ppm) and acetaldehyde (average of 0.805 ppm) was found from diluted soju (4 species).

Characterization of Traditional Korean Unifloral Honey Based on the Mono-, Di-, and Trisaccharides (한국산 벌꿀의 밀원별 단당, 이당 및 삼당류의 정량 특성)

  • Jang, Eun-Sook;Kim, In-Suk;Lee, Eun-jin;Seo, Hyun-Sun;Lee, Hye-joung;Kim, Eun;Kim, Kyung-Tae;Kim, Jong-Bae
    • Korean Journal of Food Science and Technology
    • /
    • v.48 no.1
    • /
    • pp.1-8
    • /
    • 2016
  • Sugar profiles of 45 Korean honey samples (15 acacia, 15 multi-floral, 10 chestnut, and 5 artificial honey samples), which are commercially available in the Korean markets, were analyzed using gas chromatography/mass spectrometry (GC/MS) through TMS-oxime and TMS-methoxime derivatization. The average invert sugar contents in acacia, multi-floral, chestnut, and artificial honey samples were $71.2{\pm}1.05$, $68.7{\pm}3.26$, $63.2{\pm}1.85$, and $68.0{\pm}2.10%$, respectively. Fourteen disaccharides were detected from the samples, and the average content of major disaccharides was higher in order of turanose, maltulose, maltose, trehalulose, kojibiose, isomaltose, and nigerose. The average content of total disaccharides was highest in chestnut and lowest in acacia. Seven trisaccharides were detected from the samples, and the average content of trisaccharides was the highest in artificial honeys, which had high erlose content. The total content of disaccharides and trisaccharides was highest ($16.0{\pm}2.03%$) in chestnut honey and lowest ($9.70{\pm}1.75%$) in acacia honey.