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Stock solutions of starting material, androst-4-ene-3,17-dione, and the hydroxylated testosterone standards were prepared in methanol. Aliquots of these solutions were
diluted with methanol to prepare five different concentrations for the generation of HPLC calibration curves. All standard solutions were stored at 4 ?C until further use. The mobile phase consisted of A (water¨Cacetonitrile, 47:53) and B, 100% acetonitrile. The HPLC system was operated at a flow rate of 0.5 mL/min with a linear gradient of 100% A to 100% B over 30 min, and then held at 100% B for 20 min. The exact identification of the metabolites and starting materials was established by comparing their reten-
tion times with those of authentic standards. The retention times for testosterone, testosterone heptanoate, androst-4-ene-3,17-dione, 6b-, and 14 a -hydroxy testosterones were 19.83, 42, 18.55, 7.66, and 8.76 min respectively. The quantitative analysis of samples was performed using external standard technique and each analysis was carried out in triplicate.
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bxzc123(RXMCDM´ú·¢): ½ð±Ò+8, ¶àлӦÖú£¡ 2015-10-04 19:39:26
Stock solutions of starting material, androst-4-ene-3,17-dione, and the hydroxylated testosterone standards were prepared in methanol. Aliquots of these solutions were diluted with methanol to prepare five different concentrations for the generation of HPLC calibration curves.
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bxzc123(RXMCDM´ú·¢): ½ð±Ò+10, ¶àлӦÖú£¡ 2015-10-04 19:39:11
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