The sorption of 17α-ethinyl estradiol （EE2）, bisphenol A （BPA）, and 4-n-nonylphenol （NP） in single systems and the sorption of EE2 with different initial aqueous concentrations of BPA or NP were examined using ...The sorption of 17α-ethinyl estradiol （EE2）, bisphenol A （BPA）, and 4-n-nonylphenol （NP） in single systems and the sorption of EE2 with different initial aqueous concentrations of BPA or NP were examined using three soils. Results showed that all sorption isotherms were nonlinear and fit the Freundlich model. The degree of nonlinearity was in the order BPA （0.537-0.686） 〉 EE2 （0.705-0.858） 〉 NP （0.875-0.0.951） in single systems. The isotherm linearity index of EE2 sorption calculated by the Freundlich model for Loam, Silt Loam and Silt increased from 0.758, 0.705 and 0.858, to 0.889, 0.910 and 0.969, respectively, when BPA concentration increased from 0 to 1000 μg/L, but the effect of NP was comparably minimal. Additionally, EE2 significantly suppressed the sorption of BPA, but insignificantly suppressed that of NE These findings can be attributed to the difference of sorption affinity of EE2, NP and BPA on the hard carbon （e.g., black carbon） of soil organic matter that dominated the sorption in the low equilibrium aqueous concentration range of endocrine-disrupting chemicals （EDCs）. Competitive sorption among EDCs presents new challenges for predicting the transport and fate of EDCs under the influence of co-solutes.展开更多
Ethinyl estradiol（EE） as a contraceptive,（17α）-19-nopregna-1,3,5-（10）-trien-20-yne-3,17-diol（formula： C（20）H（24）O2, molecular weight： 296.4, CAS number： 57-63-6）, is known to have different pseudo-poly...Ethinyl estradiol（EE） as a contraceptive,（17α）-19-nopregna-1,3,5-（10）-trien-20-yne-3,17-diol（formula： C（20）H（24）O2, molecular weight： 296.4, CAS number： 57-63-6）, is known to have different pseudo-polymorphic forms. Some EE polymorphs have been synthesized by means of physical or chemical methods, characterized by X-ray powder diffraction（XRPD）, thermogravimetric（TG）, differential scanning calorimetry（DSC） and IR spectra. Dissolution profile was tested by high performance liquid chromatography（HPLC）. Meanwhile, the crystal structure of the new EE solvate（formamide） was characterized by single-crystal X-ray structure analysis（SXRD）. The results confirmed that EE existed polymorphism. Five crystal forms of EE were presented and two of them were reported firstly. Furthermore, five polymorphs＇ dissolution curves were drawn and they could be identified by several analysis methods. Our study on polymorphs of EE could provide a variety of crystal material composition, preparation methods and solubility.展开更多
Objective To investigate the feasibility and optimal regimen of orally administration of low dose gossypol acetic acid （GA） combined with methyltestosterone （MT） plus ethinyl estradiol （EE） for contraception in ...Objective To investigate the feasibility and optimal regimen of orally administration of low dose gossypol acetic acid （GA） combined with methyltestosterone （MT） plus ethinyl estradiol （EE） for contraception in males.Methods Wistar male rats were randomly assigned into four groups, 20 in each group. Animals in group A or B were administered daily with 1% methyl cellulose or GA （12 mg/kg） suspended in 1% methyl cellulose, respectively. Rats in group C or D took firstly GA 12 mg/kg＋MT 20 mg/kg＋EE 0.1 mg/kg or MT 20 mg/kg＋EE 0.1 mg/kg, in asuspension with 1% methyl cellulose, via gastric intubation. After the infertilities were initiated（6 weeks for group C, 8 weeks for group D）, GA was served alone while MT＋EE were withdrawn in rats of groups C and D. The treatment was ceased after 18 weeks and some males from group C were permitted to recover. Fertility testing, 10 males per group, was served for determining infertility or restoration of fertility in treated rats. Examinations of histology and biochemistry in treated rats were used to examine the morphologic influences on sperm, testis, epididymides and viscera, and biochemical changes in blood. The growth and development of F1 generation of the rats would also be tested in a series of behavioral tests.Results Ten rats from group C were infertile at week 6 after treatment, and the fulfilled infertility was maintained with low-dose GA （12 mg/kg） only daily. Six weeks after cessation of treatment, all of treated males recovered their fertility. However, 8 of 10 rats from group D were in sterility at 6th week of treatment and all at 8th week of treatment, but the infertility could not be kept with the similar dose GA alone later on. Moreover, no adverse effects were found in our present experiments.Conclusion Administration of oral low dose GA combined with MT and EE as loading dose could successfully induce infertility in short term, whereafter the efficacy could completely be maintained by similar low dose of GA alone for long term. The combined regimen should be safe, effective, reversible and long term, and then optimal and promised contraception for male.展开更多
A sensitive and simultaneous liquid chromatography-tandem mass spectrometry method was developed and validated for quantification of ethinyl estradiol and levonorgestrel. The analytes were extracted with methyl-tert-b...A sensitive and simultaneous liquid chromatography-tandem mass spectrometry method was developed and validated for quantification of ethinyl estradiol and levonorgestrel. The analytes were extracted with methyl-tert-butyl ether： n-hexane （50：50, v/v） solvent mixture, followed by dansyl derivatization. The chromatographic separation was performed on a Kinetex Cla （50 mm × 4.6 mm, 2.6 μm） column with a mobile phase of 0.1% （v/v） formic acid in water and acetonitrile in gradient composition. The mass transitions were monitored in electrospray positive ionization mode. The assay exhibited a linear range of 0.100-20.0 ng/mL for levonorgestrel and 4.00-500 pg/mL for ethinyl estradiol in human plasma. A run time of 9.0 min for each sample made it possible to analyze a throughput of more than 100 samples per day. The validated method has been successfully used to analyze human plasma samples for application in pharmacokinetic and bioequivalence studies.展开更多
基金supported by the Special Environmental Research Funds for Public Welfare (No. 201209053)the National High Technology Research and Development Program (863) of China (No. 2008AA062502)
文摘The sorption of 17α-ethinyl estradiol （EE2）, bisphenol A （BPA）, and 4-n-nonylphenol （NP） in single systems and the sorption of EE2 with different initial aqueous concentrations of BPA or NP were examined using three soils. Results showed that all sorption isotherms were nonlinear and fit the Freundlich model. The degree of nonlinearity was in the order BPA （0.537-0.686） 〉 EE2 （0.705-0.858） 〉 NP （0.875-0.0.951） in single systems. The isotherm linearity index of EE2 sorption calculated by the Freundlich model for Loam, Silt Loam and Silt increased from 0.758, 0.705 and 0.858, to 0.889, 0.910 and 0.969, respectively, when BPA concentration increased from 0 to 1000 μg/L, but the effect of NP was comparably minimal. Additionally, EE2 significantly suppressed the sorption of BPA, but insignificantly suppressed that of NE These findings can be attributed to the difference of sorption affinity of EE2, NP and BPA on the hard carbon （e.g., black carbon） of soil organic matter that dominated the sorption in the low equilibrium aqueous concentration range of endocrine-disrupting chemicals （EDCs）. Competitive sorption among EDCs presents new challenges for predicting the transport and fate of EDCs under the influence of co-solutes.
基金supported by the Key National Research and Development Programs(No.2016YFC1000900)
文摘Ethinyl estradiol（EE） as a contraceptive,（17α）-19-nopregna-1,3,5-（10）-trien-20-yne-3,17-diol（formula： C（20）H（24）O2, molecular weight： 296.4, CAS number： 57-63-6）, is known to have different pseudo-polymorphic forms. Some EE polymorphs have been synthesized by means of physical or chemical methods, characterized by X-ray powder diffraction（XRPD）, thermogravimetric（TG）, differential scanning calorimetry（DSC） and IR spectra. Dissolution profile was tested by high performance liquid chromatography（HPLC）. Meanwhile, the crystal structure of the new EE solvate（formamide） was characterized by single-crystal X-ray structure analysis（SXRD）. The results confirmed that EE existed polymorphism. Five crystal forms of EE were presented and two of them were reported firstly. Furthermore, five polymorphs＇ dissolution curves were drawn and they could be identified by several analysis methods. Our study on polymorphs of EE could provide a variety of crystal material composition, preparation methods and solubility.
文摘Objective To investigate the feasibility and optimal regimen of orally administration of low dose gossypol acetic acid （GA） combined with methyltestosterone （MT） plus ethinyl estradiol （EE） for contraception in males.Methods Wistar male rats were randomly assigned into four groups, 20 in each group. Animals in group A or B were administered daily with 1% methyl cellulose or GA （12 mg/kg） suspended in 1% methyl cellulose, respectively. Rats in group C or D took firstly GA 12 mg/kg＋MT 20 mg/kg＋EE 0.1 mg/kg or MT 20 mg/kg＋EE 0.1 mg/kg, in asuspension with 1% methyl cellulose, via gastric intubation. After the infertilities were initiated（6 weeks for group C, 8 weeks for group D）, GA was served alone while MT＋EE were withdrawn in rats of groups C and D. The treatment was ceased after 18 weeks and some males from group C were permitted to recover. Fertility testing, 10 males per group, was served for determining infertility or restoration of fertility in treated rats. Examinations of histology and biochemistry in treated rats were used to examine the morphologic influences on sperm, testis, epididymides and viscera, and biochemical changes in blood. The growth and development of F1 generation of the rats would also be tested in a series of behavioral tests.Results Ten rats from group C were infertile at week 6 after treatment, and the fulfilled infertility was maintained with low-dose GA （12 mg/kg） only daily. Six weeks after cessation of treatment, all of treated males recovered their fertility. However, 8 of 10 rats from group D were in sterility at 6th week of treatment and all at 8th week of treatment, but the infertility could not be kept with the similar dose GA alone later on. Moreover, no adverse effects were found in our present experiments.Conclusion Administration of oral low dose GA combined with MT and EE as loading dose could successfully induce infertility in short term, whereafter the efficacy could completely be maintained by similar low dose of GA alone for long term. The combined regimen should be safe, effective, reversible and long term, and then optimal and promised contraception for male.
文摘A sensitive and simultaneous liquid chromatography-tandem mass spectrometry method was developed and validated for quantification of ethinyl estradiol and levonorgestrel. The analytes were extracted with methyl-tert-butyl ether： n-hexane （50：50, v/v） solvent mixture, followed by dansyl derivatization. The chromatographic separation was performed on a Kinetex Cla （50 mm × 4.6 mm, 2.6 μm） column with a mobile phase of 0.1% （v/v） formic acid in water and acetonitrile in gradient composition. The mass transitions were monitored in electrospray positive ionization mode. The assay exhibited a linear range of 0.100-20.0 ng/mL for levonorgestrel and 4.00-500 pg/mL for ethinyl estradiol in human plasma. A run time of 9.0 min for each sample made it possible to analyze a throughput of more than 100 samples per day. The validated method has been successfully used to analyze human plasma samples for application in pharmacokinetic and bioequivalence studies.
