• <tr id="yyy80"></tr>
  • <sup id="yyy80"></sup>
  • <tfoot id="yyy80"><noscript id="yyy80"></noscript></tfoot>
  • 99热精品在线国产_美女午夜性视频免费_国产精品国产高清国产av_av欧美777_自拍偷自拍亚洲精品老妇_亚洲熟女精品中文字幕_www日本黄色视频网_国产精品野战在线观看 ?

    Determination of asenapine in presence of its inactive metabolites in human plasma by LC-MS/MS

    2018-10-18 07:31:46NirvPtelMllikSnylNveenShrmDineshPtelPrnvShrivstvBhvinPtel
    Journal of Pharmaceutical Analysis 2018年5期

    Nirv P.Ptel,Mllik Snyl,Nveen Shrm,Dinesh S.Ptel,Prnv S.Shrivstv,Bhvin N.Ptel

    aBioanalytical Laboratory,Cliantha Research India Ltd.,Bodakdev,Ahmedabad 380054,Gujarat,India

    bKadi Sarva Viswavidyalaya,Sector-15,Ghandhinagar 382715,Gujarat,India

    cDepartment of Chemistry,St.Xavier's College,Navrangpura,Ahmedabad 380009,Gujarat,India

    dDepartment of Chemistry,School of Sciences,Gujarat University,Navrangpura,Ahmedabad 380009,Gujarat,India

    Keywords:Asenapine Asenapine 13C-d3 Metabolites LC-MS/MS Bioequivalence study Human plasma

    A B S T R A C T A highly selective and sensitive liquid chromatography-tandem mass spectrometry(LC-MS/MS)assay has been described for the determination of asenapine(ASE)in presence of its inactive metabolites N-desmethyl asenapine(DMA)and asenapine-N-glucuronide(ASG).ASE,and ASE 13C-d3,used as internal standard(IS),were extracted from 300 μL human plasma by a simple and precise liquid-liquid extraction procedure using methyl tert-butyl ether.Baseline separation of ASE from its inactive metabolites was achieved on Chromolith Performance RP8e(100 mm×4.6 mm)column using acetonitrile-5.0 mM ammonium acetate-10%formic acid(90:10:0.1,v/v/v)within 4.5 min.Quantitation of ASE was done on a triple quadrupole mass spectrometer equipped with electrospray ionization in the positive mode.The protonated precursor to product ion transitions monitored for ASE and ASE 13C-d3 were m/z 286.1→166.0 and m/z 290.0→166.1,respectively.The limit of detection(LOD)and limit of quantitation(LOQ)of the method were 0.0025 ng/mL and 0.050ng/mL respectively in a linear concentration range of 0.050–20.0 ng/mL for ASE.The intra-batch and inter-batch precision(%CV)and mean relative recovery across quality control levels were≤5.8%and 87.3%,respectively.Matrix effect,evaluated as IS-normalized matrix factor,ranged from 1.03 to 1.05.The stability of ASE under different storage conditions was ascertained in presence of the metabolites.The developed method is much simpler,matrix free,rapid and economical compared to the existing methods.The method was successfully used for a bioequivalence study of asenapine in healthy Indian subjects for the first time.

    1.Introduction

    Asenapine(ASE)is a second generation antipsychotic drug used for the acute treatment of manic or mixed episodes,associated with bipolar I disorder and schizophrenia[1–3].Pharmacologically,ASE is a dibenzo-oxepino pyrrole drug with a tetracyclic structure.It is the ninth atypical antipsychotic agent that received regulatory approval in August 2009 from the US Food and Drug Administration(FDA)to schizophrenia and bipolar I disorder in adults[4].It shows high affinity to serotonin receptors(5-HT1a,5-HT1b, 5-HT2a,5-HT2b,5-HT2c,5-HT5,5-HT6,and 5-HT7),dopamine receptors(D1,D2,D3,and D4),alpha 1 and 2 receptors,histamine(H1)receptors and moderate affinity to histamine(H2)receptors.Unlike otherantipsychotic agents,ASE has no appreciable affinity towards muscarinic receptors[1,4].ASE is unique among other atypical antipsychotics like risperidone,olanzapine and aripiprazole,in its mode of administration.It is available only as a sublingual,rapidly dissolving formulation that exposes the drug only to salivary enzymes and bypasses first pass metabolism.When administered sublingually,it has a bioavailability of about 35%,while the oral bioavailability is only 2%,when swallowed[5].The time taken to achieve the maximum drug plasma concentration(Tmax)after a single 5 mg dose is about 1h.ASE is highly protein bound(95%),primarily to albumin and alpha-1acid glycoprotein and shows excellent penetration across the blood–brain barrier.Asenapine is metabolized to several metabolites;however,none of them have any significant pharmacological activity.The primary mechanism of metabolism involves glucuronidation through UDP glucuronosyl transferase 1A4(UGT1A4),producing asenapine-N-glucuronide(ASG).The other major metabolite of ASE isN-desmethyl asenapine(DMA),which is formed via demethylation,mainly through CYP1A2,with only minor contributions from CYP3A4 and CYP2D6[2,6].

    Literature presents few methods to determine ASE in biological samples[7–11].Van de Wetering-Krebbers et al.[7]studied the excretion balance and metabolism routes of ASE in humans and determined its plasma,urine and fecal concentration using highperformance liquid chromatography(HPLC).A gas chromatography-mass spectrometry(GC-MS)method is also described to analyze ASE in postmortem samples[8].Reddy et al.[9]have presented a liquid chromatography-tandem mass spectrometry(LC-MS/MS)method for the simultaneous determination of ASE and valproic acid in human plasma.Two other methods describe quantification of ASE and its inactive metabolites in human plasma[10]and urine[11]using LC-MS/MS.In these methods[10,11],two separate assays were developed,one for ASE,DMA and 11-O-sulfate asenapine(OSA)and the other for ASG,respectively under gradient elution.In the present work a highly selective and sensitive LC-MS/MS assay is developed to determine ASE in human plasma in presence of its inactive metabolites,ASG and DMA.The assay presents a straightforward liquid-liquid extraction(LLE)extraction procedure to obtain a precise and quantitative recovery of ASE.The proposed method was successfully applied to a bioequivalence study of 10 mg asenapine sublingual tablet formulation in 14 healthy subjects under fasting.

    2.Experimental

    2.1.Chemicals and materials

    Reference standards of asenapine(ASE,99.6%),asenapine 13C-d3(IS,99.5%),N-desmethyl asenapine(DMA,99.1%)and asenapine-N-glucuronide(ASG,98.7%)were procured from Clearsynth Labs(P)Ltd.(Mumbai,India).HPLC grade methanol and acetonitrile,analytical grade formic acid,ammonia and ammonium acetate were obtained from S.D.Fine Chemicals Ltd.(Mumbai,India).Deionized water used for LC-MS/MS was prepared using Milli Q water purification system from Millipore(Bangalore,India).Methyltert-butyl ether(MTBE)was procured from J.T Baker Chemicals Ltd.(Haryana,India).Control buffered(K2-EDTA)human plasma was procured from Clinical Department,Cliantha Research India Limited(Ahmedabad,India)and was stored at-20°C until use.

    2.2.LC-MS/MS instrumentation and conditions

    The liquid chromatography system from Shimadzu(Kyoto,Japan)consisted of an LC-10ADvp pump,an autosampler(SIL-HTc)and an on-line degasser(DGU-14A).Chromatographic column used was Chromolith Performance RP8e(100mm×4.6mm)from Merck(Mumbai,India).The mobile phase consisted of acetonitrile-5.0mM ammonium acetate-10%formic acid in 90:10:0.1(v/v/v)ratio,delivered at a flow rate of 0.9mL/min.The auto sampler temperature was maintained at 4°C and the injection volume was kept at 5.0μL.Ionization and detection of ASE and IS was performed on a triple quadrupole mass spectrometer,API-4000 equipped with turbo ion spray from MDS SCIEX(Toronto,Canada)and was operated in the positive ionization mode.Quantitation was performed using multiple reaction monitoring(MRM)mode to monitor protonated precursor→product ion transition ofm/z286.1→166.0 for ASE andm/z290.0→166.1 for IS.All the parameters of LC and MS were controlled by Analyst software version 1.6.2.The optimized mass parameters are summarized in Supplementary material.

    2.3.Preparation of calibration and quality control samples

    The calibration standards(CSs)were made at 0.05,0.10,0.20,0.50,1.00,2.00,4.00,8.00,16.0 and 20.0ng/mL for ASE.Six quality control(QC)samples were prepared at the following concentrations,0.05ng/mL (LLOQ QC,lower limit of quantitation quality control),0.15ng/mL(LQC,low quality control),1.50/5.00ng/mL(MQC-1/MQC-2,medium quality control),15.0ng/mL(HQC,high quality control)and 20.0ng/mL(ULOQ QC,upper limit of quantitation quality control).

    2.4.Protocol for sample preparation

    Prior to analysis,spiked plasma/subject samples were thawed and allowed to equilibrate at room temperature.The samples were adequately vortexed before pipetting.Aliquots of 300μL plasma solutions containing 15μL of working solution of ASE and 285μL blank plasma were transferred into screw cap tubes.To which,25μL of methanol:deionized water(60:40,v/v),50μL working solution of IS(25.0ng/mL)was added and vortexed to mix.Further,500μL of 5.0mM ammonium acetate solution(pH 9,adjusted with ammonia)was added and vortexed again.LLE was carried out using 3.0mL of MTBE by centrifuging the samples for 5.0min at 1811g.After freezing the aqueous layer in dry ice bath,the organic layer was transferred in clean pre-labeled glass tubes.The samples were then evaporated to dryness at 40°C under gentle stream of nitrogen.The dried samples were reconstituted with 500μL of mobile phase solution and 5.0μL was used for injection in LC-MS/MS,in partial loop mode.

    2.5.Methodology for validation

    Method validation for ASE in human plasma was done following the USFDA guidelines[12]and the procedures followed were similar to our previous work[13].The details are described in Supplementary material.

    2.6.Bioequivalence study design and incurred sample reanalysis(ISR)

    The design of study comprised an open label,randomized,twoperiod,two-treatment,two-sequence,crossover,balanced,single dose,evaluation of relative oral bioavailability of test(10 mg asenapine sublingual orally disintegrating tablet from an Indian company)and reference formulations(SAPHRIS?,10 mg asenapine sublingual orally disintegrating tablet from Merck Sharp&Dohme Company,Whitehouse Station,NJ08889,USA)in 14 healthy adult Indian subjects under fasting.The procedures followed while dealing with human subjects were based on International Conference on Harmonization,E6 Good Clinical Practice guidelines[14].An incurred sample reanalysis(ISR)was also conducted by computerized selection of 70 subject samples near Cmaxand the elimination phase for the study as reported previously[15].The experimental details for the study along with statistical analysis are described in Supplementary material.

    3.Results and discussion

    3.1.Method development

    ?

    The objective of the present work was to develop and validate a selective and sensitive method for ASE in presence of its inactive metabolites by LC-MS/MS and to apply the method for a bioequivalence study of ASE sublingual tablet formulation in healthy subjects.Furthermore,the sensitivity of the method should be such that it can monitor at least five half lives of ASE concentration with good accuracy and precision for the analysis of subject samples.Though there are reports on the simultaneous determination of ASE and its metabolites in human plasma and urine[10,11],two different methods were adopted to determine ASG separately from ASE,DMA and OSA.Moreover,the analytes ASE,DMA and OSA were not chromatographically resolved on reversed-phase C8column under gradient elution conditions.Initial attempts to separate ASE from DMA(20.0 ng/mL)and ASG(20.0 ng/mL)on conventional reversed phase C8and C18columns like Hypurity C18(100 mm × 4.6 mm,5 μm),Hypurity C8(100 mm × 4.6 mm,5μm),ACE C8(100 mm × 4.6 mm,5 μm)and Eclipse XDB-C8(150 mm × 4.6 mm,3.5 μm)were unsuccessful using acetonitrile/methanol and 2–10 mM ammonium acetate/formate buffer as the mobile phase.Additionally,the flow rate was also varied from 0.6 to 1.2 mL/min.Under these conditions it was difficult to resolve the peaks of ASE and its metabolites even up to 10 min.Attempts to increase the proportion of organic content(>70%)or the flow rate resulted in poor resolution and peak shapes of ASG and to a lesser extent for DMA.Thus,the method was transferred to a monolithic silica column,Chromolith Performance RP8e(100 mm×4.6 mm)and developed using the same mobile phases.However,some peak tailing was observed for ASG and also the response was not adequate for ASE under isocratic elution conditions.Thus,the mobile phase was suitably optimized along with the buffer pH.Increase in pH of buffer resulted in slight increase in retention time of ASE with limited separation from ASG.However,the best chromatographic conditions in terms of resolution,analyte response,peak shape and adequate retention were obtained using acetonitrile-5.0 mM ammonium acetate-10%formic acid(pH,5.5)in 90:10:0.1(v/v/v)ratio as the mobile phase at a flow rate of 0.9 mL/min.All three compounds were baseline resolved within 4.5min.The retention time of ASE,DMA and ASG was 3.63,2.82 and 4.05min,respectively.Use of labeled IS helped in offsetting any possible ion suppression caused by the plasma matrix and also by compensating any inconsistency during extraction.

    The mass spectra of ASE and ASE 13C-d3(IS)were recorded in the positive ionization mode as both the compounds are basic in nature due to the presence of pyrrole ring.Using 10.0 ng/mL tuning solution,ASE and IS gave predominant singly charged protonated precursor[M+H]+ions atm/zof 286.1 and 290.0 for ASE and IS,respectively in Q1 full scan spectra.Further,fragmentation of the precursor ion was initiated by providing sufficientnitrogen for collisional activation dissociation and by applying 20.0 psi curtain gas to obtain highly consistent and abundant product ions of ASE and IS atm/z166.0 as shown in Fig.S1.Other stable product ions were also found atm/z194,215 and 229.However,due to superior signal to noise(S/N)ratio the product ion atm/z166.0 was selected for quantitation.Additionally,to verify the identity of the analyte and IS qualifier transitions were also monitored atm/z286.1/194.0 for ASE andm/z290.0/194.1 for IS.Furthermore,to reach an ideal Taylor cone for better spectral response,nebulizer gas pressure was set at 50psi to get a consistent and stable response.A dwell time of 300ms was sufficient to generate at least 24 data points for quantitative analysis of ASE and IS.Also,there was no cross talk between the MRMs of ASE and IS which had identical product ions.

    In a previous report,Reddy et al.[9]used LLE for the extraction of ASE from human plasma with a recovery of 81.3%.Moreover,ASE has a logPvalue of 4.9[16];thus LLE was tested with different solvents liken-hexane,MTBE,dichloromethane and diethyl ether and their binary mixtures.In these solvent systems the recovery of ASE ranged from 59%to 77%under neutral conditions.In addition,the recovery was highly consistent,especially in MTBE.In order to further improve the recovery,mild alkaline conditions(pH 9.0)were set to keep the drug in its unionized state using MTBE.The recovery of ASE(85.2%–89.4%)and IS(86.3%–88.0%)thus obtained from spiked plasma samples was highly consistent and reproducible.

    Fig.1.Representative MRM chromatograms of(A)double blank plasma(without asenapine and asenapine13C-d3),(B)blank plasma spiked with asenapine13C-d3(25.0 ng/mL),(C)asenapine(0.050 ng/mL),N-desmethyl asenapine(20.0 ng/mL)and asenapine-N-glucuronide(20.0 ng/mL)and asenapine13C-d3(25 ng/mL),(D)asenapine(20.0 ng/mL),N-desmethyl asenapine(20.0 ng/mL)and asenapine-N-glucuronide(20.0 ng/mL)and asenapine13C-d3(25 ng/mL)and(E)real subject sample at Cmaxafter oral administration of 10 mg dose of asenapine.

    The significant features of the present work include baseline separation of ASE from its inactive metabolites under isocratic elution,which is not possible with the existing LC-MS/MS methods employing gradient elution program[10,11].Further,it was not feasible to analyze ASG along with ASE and other metabolites due to difference in polarity and therefore a separate method was established for ASG[10].Besides,the newly developed method presents an efficient,relatively inexpensive and straightforward extraction procedure for precise and quantitative recovery of ASE in presence of its inactive metabolites.Though the sensitivity of ASE achieved(0.05 ng/mL)was less than the work of de Boer et al.[10](0.025 ng/mL),it was higher than that of another report(0.10 ng/mL)[9].On the other hand,the analysis time of 4.5 min was shorter than in methods reported for the determination of ASE together with its metabolites[10,11].The plasma volume used for processing is less(300μL)compared to the work of de Boer et al.[10],which employed 500 μL sample volume.Moreover,their method involved an automated SPE using 96-well plate which is not used routinely.A comparative evaluation of methods developed for ASE is illustrated in Table 1.

    3.2.Assay performance and validation

    The selectivity of the method from endogenous plasma components was determined by analyzing eight different human plasma sources.This was done to evaluate the extent to which matrixcomponents may interfere at the retention time of ASE and the IS.Fig.1 demonstrates the selectivity of the method with the chromatograms of double blank plasma,blank plasma spiked with IS,ASE at LLOQ and ULOQ concentration and in subject samples.Carry-over evaluation was performed in each analytical run to ensure that it does not impact the accuracy and precision of the method.The results showed a carryover of≤2.23%for ASE concentration(0.05ng/mL)in the blank plasma sample after injection of highest calibration standard(ULOQ)at the retention time of ASE.Further,there was no interference of commonly used medications by healthy volunteers like acetaminophen,aspirin,caffeine,chlorpheniramine,cetirizine,ibuprofen and pseudoephedrine at the retention time of ASE and IS.Similarly,none of the metabolites(DMA and ASG)interfered in the determination of ASE as they were chromatographically separated.

    Table 2 Intra-batch and inter-batch accuracy and precision for asenapine.

    Table 3 Extraction recovery and matrix factor for asenapine in presence of its metabolites(n=6).

    Table 4 Stability results for asenapine under different conditions(n=6).

    Fig.2.Mean plasma concentration-time profile of asenapine after sublingual administration of 10 mg tablet(test and reference)formulation to 14 healthy Indian subjects under fasting.

    The calibration curve was linear over the concentration range of 0.05–20.0ng/mL with correlation coefficientr2≥ 0.9996.Astraight-line fit was made through the data points by least square regression analysis to give a mean linear equation,y=(1.2033±0.0035)x–(0.0091 ± 0.0007),whereyis the peak area ratio(ASE/IS)andxis the concentration of ASE.The accuracy and precision(%CV)observed for the CSs ranged from 97.3%to 102.3%and 0.6%–2.3%,respectively.The lowest concentration(LLOQ)that was measured with acceptable accuracy and precision was 0.05 ng/mL at S/N≥15,and the limit of detection(LOD)of the method was 0.0025 ng/mL.

    Table 5 Mean pharmacokinetic parameters(±SD),comparison of treatment ratios and 90%CIs of natural log(Ln)-transformed following administration of 10 mg asenapine maleate sublingual tablet to 14 healthy Indian subjects under fasting.

    The intra-batch and inter-batch precision and accuracy results are summarized in Table 2.The intra-batch precision(%CV)ranged from 1.3%to 2.8%and the accuracy was within 94.1%–99.5%.For the inter-batch experiments,the precision varied from 2.4%to 5.8%and the accuracy was within 91.2%–97.0%.The extraction recovery and matrix effect data for ASE and IS are shown in Table 3.Highly consistent recovery was obtained across QC levels for ASE.The IS-normalized matrix factors ranged from 1.03 to 1.05,which shows minimal interference of endogenous matrix components.Matrix effect was also checked in different plasma sources(6-K2EDTA,1-lipemic and 1-heamolyzed)and was also evaluated at LQC and HQC levels.The precision(%CV)in different plasma sources varied from 0.6%to 2.8%for ASE(Table S1).This was much less than that of a previous report[10],wherein it was>15%for ASE and its IS.Post-column infusion further substantiated the absence of matrix effects with no signal enhancement or suppression at the retention time of ASE or ASE 13C-d3(Fig.S2).There was a minor ion suppression(~3.0%)observed before the analyte peak at 3.3–3.4 min,but it did not interfere in the quantitation of ASE or IS.

    Stability experiments were performed to evaluate the stability of ASE in stocks solutions and in plasma samples under different conditions in presence of its metabolites.ASE was found stable in controlled blank plasma at room temperature up to 24h and for six freeze and thaw cycles.The stability of ASE in extracted plasma samples was stable for 94 h under refrigerated conditions(5°C)and for 75 h at room temperature.The spiked plasma samples of ASE stored at-20 °C and at-70 °C for long-term stability showed no evidence of degradation even up to 126 days.The detailed stability results are shown in Table 4.

    Dilution integrity of the method was checked to ascertain dilution reliability of samples having concentration of ASE above ULOQ.The precision(%CV)values for 10-fold dilution of 100 ng/mL(5 × ULOQ concentration)were in range of 0.9%–1.5%and accuracy results was within 97.3%–100.5%.Similarly,the precision and accuracy for method ruggedness on two different Chromolith Performance RP8ecolumns and with different analysts varied from 1.0%to 7.4%and 92.5%–96.9%,respectively for ASE.

    3.3.Application of the method in healthy subjects and ISR results

    The validated method was applied to a bioequivalence study of ASE in 14 healthy Indian subjects who received 10 mg test and reference formulations of ASE under fasting condition.The method was sensitive enough to monitor their plasma concentration up to 48 h.Fig.2 shows the plasma concentration-time profile of ASE in healthy subjects.Table 5 gives the values of pharmacokinetic parameters of test and reference formulations and equivalence statistics of bioavailability for the pharmacokinetic parameters.The results obtained forCmax,Tmax,t1/2and AUC were in good agreement with reported studies[3,5,9].Further,the 90%conf i dence intervals of the test/reference formulations for Cmax,AUC0–48hand AUC0-infvaried from 83.4%to 97.3%,which is within the bioequivalence acceptance criterion of 80%–125%.No statistically significant differences were found between the two formulations in any parameter.Further,there was no adverse event during the course of the study.The%change in the measurement of selected subject samples for ISR was within±14.5%,which confirms method reproducibility.

    4.Conclusion

    In summary,we have described a selective and sensitive LCMS/MS method for the estimation of ASE in human plasma,especially to meet the requirement for subject sample analysis.The inactive metabolites,DMA and ASG,were successfully resolved on a monolithic silica column.The LLE procedure employed in the present work gave consistent and reproducible recovery for ASE.The optimized linear concentration range was adequate to monitor at least five half-lives of ASE with good accuracy and precision.Furthermore,the results of the reanalysis of study data have shown sufficient reproducibility of the method.

    Conflicts of interest

    The authors declare that there are no conflicts of interest.

    Acknowledgments

    The authors are indebted to Mr.Vijay Patel,Executive Director,Cliantha Research Ltd.,Ahmedabad,India,for providing necessary facilities to carry out this work and to Mr.Anshul Dogra,Head of the Department,Cliantha Research Ltd.,for his support during the course of this project.

    Appendix A.Supplementary material

    Supplementary data associated with this article can be found in the online version at http://dx.doi.org/10.1016/j.jpha.2018.06.002.

    欧美日韩黄片免| 亚洲欧美日韩高清在线视频| 国产真实乱freesex| 国产成人影院久久av| 一个人免费在线观看电影| 99九九线精品视频在线观看视频| 国产伦精品一区二区三区视频9| 最好的美女福利视频网| 不卡一级毛片| 女同久久另类99精品国产91| 色综合色国产| 国产伦一二天堂av在线观看| av专区在线播放| 99热这里只有是精品50| 欧美国产日韩亚洲一区| 精品日产1卡2卡| 桃色一区二区三区在线观看| 在线免费十八禁| 午夜免费激情av| 桃红色精品国产亚洲av| 亚洲精品久久国产高清桃花| 我要搜黄色片| 91在线精品国自产拍蜜月| 黄色视频,在线免费观看| 变态另类丝袜制服| 欧美精品国产亚洲| 国产精品免费一区二区三区在线| 亚洲美女视频黄频| 欧美bdsm另类| 国产免费av片在线观看野外av| 精品国产三级普通话版| 国产高清激情床上av| 在线观看一区二区三区| 男人舔女人下体高潮全视频| 日韩欧美一区二区三区在线观看| 亚洲成人中文字幕在线播放| 国产精品福利在线免费观看| av在线观看视频网站免费| 日本五十路高清| 村上凉子中文字幕在线| 国产男靠女视频免费网站| 国产精品一区二区性色av| 亚洲中文字幕日韩| av天堂中文字幕网| 在线a可以看的网站| 国产精品1区2区在线观看.| 老司机深夜福利视频在线观看| 波多野结衣巨乳人妻| 看黄色毛片网站| 啦啦啦韩国在线观看视频| 在线国产一区二区在线| 国产成人一区二区在线| 久久久久国产精品人妻aⅴ院| 日韩精品中文字幕看吧| 天天一区二区日本电影三级| 内射极品少妇av片p| 免费看光身美女| 搞女人的毛片| 99久久九九国产精品国产免费| 白带黄色成豆腐渣| 免费看光身美女| 久久久久久久久久成人| 波多野结衣巨乳人妻| 国产亚洲精品av在线| 亚洲精华国产精华液的使用体验 | 免费av不卡在线播放| 婷婷亚洲欧美| 99久久九九国产精品国产免费| 波野结衣二区三区在线| 又紧又爽又黄一区二区| av福利片在线观看| 成人毛片a级毛片在线播放| 又粗又爽又猛毛片免费看| 中文亚洲av片在线观看爽| 九九在线视频观看精品| 成人特级黄色片久久久久久久| 老司机午夜福利在线观看视频| 久久天躁狠狠躁夜夜2o2o| 99riav亚洲国产免费| 国内精品宾馆在线| 国产淫片久久久久久久久| 亚洲人成伊人成综合网2020| 免费看日本二区| 久久精品国产鲁丝片午夜精品 | 日本 av在线| 天堂动漫精品| 欧美性猛交黑人性爽| 成人午夜高清在线视频| 一边摸一边抽搐一进一小说| 国产亚洲精品久久久com| 国产美女午夜福利| 午夜福利成人在线免费观看| 久久人妻av系列| 中文字幕高清在线视频| 国产精品99久久久久久久久| 网址你懂的国产日韩在线| 国产极品精品免费视频能看的| 一进一出抽搐gif免费好疼| 国产真实伦视频高清在线观看 | 国产69精品久久久久777片| 欧洲精品卡2卡3卡4卡5卡区| 天堂影院成人在线观看| 美女被艹到高潮喷水动态| 国产伦一二天堂av在线观看| 国语自产精品视频在线第100页| 成人毛片a级毛片在线播放| 亚洲欧美日韩无卡精品| 香蕉av资源在线| 成年女人永久免费观看视频| 精品免费久久久久久久清纯| 春色校园在线视频观看| 美女 人体艺术 gogo| aaaaa片日本免费| 91精品国产九色| 国产高清三级在线| 赤兔流量卡办理| 国产黄片美女视频| 国产精品综合久久久久久久免费| 国产三级在线视频| 最新中文字幕久久久久| 精品久久久久久久久av| 久久久久久久精品吃奶| 午夜精品久久久久久毛片777| 欧美中文日本在线观看视频| 国产在视频线在精品| 在线国产一区二区在线| 日本成人三级电影网站| 亚洲成人久久性| 五月伊人婷婷丁香| 亚洲自偷自拍三级| 免费观看人在逋| 99精品久久久久人妻精品| 国产v大片淫在线免费观看| 国产在线精品亚洲第一网站| 在线国产一区二区在线| 国产白丝娇喘喷水9色精品| 我的老师免费观看完整版| 12—13女人毛片做爰片一| 熟女电影av网| av福利片在线观看| 成年女人看的毛片在线观看| 国产三级中文精品| 久久精品国产亚洲av香蕉五月| 亚洲熟妇熟女久久| 亚洲欧美日韩卡通动漫| 久久久色成人| 女的被弄到高潮叫床怎么办 | 亚洲综合色惰| 听说在线观看完整版免费高清| 一区二区三区免费毛片| 精品无人区乱码1区二区| 欧美国产日韩亚洲一区| 亚洲午夜理论影院| 国产高清不卡午夜福利| 国产爱豆传媒在线观看| 久久久成人免费电影| av在线天堂中文字幕| 国产精品嫩草影院av在线观看 | 亚洲中文日韩欧美视频| 亚洲人成网站在线播放欧美日韩| av天堂在线播放| 亚洲精品色激情综合| 亚洲黑人精品在线| bbb黄色大片| 久久久久精品国产欧美久久久| 欧美+日韩+精品| 两个人的视频大全免费| 欧美bdsm另类| 淫秽高清视频在线观看| 嫁个100分男人电影在线观看| 99久国产av精品| av专区在线播放| 精品不卡国产一区二区三区| 亚洲精品日韩av片在线观看| 亚洲内射少妇av| 一区二区三区四区激情视频 | 欧美日本亚洲视频在线播放| 色哟哟·www| 国产精华一区二区三区| 欧美另类亚洲清纯唯美| 国产伦精品一区二区三区四那| 国产高清不卡午夜福利| 国产精品无大码| 国产一区二区激情短视频| 国产免费一级a男人的天堂| 黄片wwwwww| 美女xxoo啪啪120秒动态图| 成年人黄色毛片网站| 欧美国产日韩亚洲一区| 亚洲性久久影院| 国内精品美女久久久久久| 国产av在哪里看| 亚洲18禁久久av| 久久6这里有精品| 国产成人av教育| 国产精品永久免费网站| 午夜日韩欧美国产| 亚洲专区国产一区二区| 成人国产一区最新在线观看| www.色视频.com| 制服丝袜大香蕉在线| 亚洲最大成人手机在线| 日本黄色片子视频| 日韩大尺度精品在线看网址| 久久久久国产精品人妻aⅴ院| 亚洲专区中文字幕在线| 免费av毛片视频| 国产精品爽爽va在线观看网站| 欧美激情在线99| 国产亚洲欧美98| 亚洲欧美日韩高清在线视频| 日韩国内少妇激情av| 久久热精品热| 国产精品国产三级国产av玫瑰| 免费观看人在逋| 亚洲欧美日韩高清专用| 亚洲久久久久久中文字幕| 搡老熟女国产l中国老女人| 国产女主播在线喷水免费视频网站 | 日韩欧美 国产精品| 成人三级黄色视频| or卡值多少钱| 日本欧美国产在线视频| 亚洲美女搞黄在线观看 | 尤物成人国产欧美一区二区三区| 国产精品人妻久久久久久| 日韩中文字幕欧美一区二区| 日韩欧美国产一区二区入口| 久久99热这里只有精品18| 亚洲狠狠婷婷综合久久图片| 亚洲精品久久国产高清桃花| 麻豆精品久久久久久蜜桃| 淫妇啪啪啪对白视频| 国产精品亚洲美女久久久| 国产极品精品免费视频能看的| 国产蜜桃级精品一区二区三区| 91久久精品国产一区二区三区| 天美传媒精品一区二区| 久久久国产成人免费| 国产aⅴ精品一区二区三区波| 欧美最黄视频在线播放免费| h日本视频在线播放| 久久精品国产自在天天线| 在线观看美女被高潮喷水网站| 国产中年淑女户外野战色| 国产高清三级在线| 一级黄色大片毛片| 午夜福利欧美成人| 男女之事视频高清在线观看| 久久久久性生活片| 亚洲人成网站高清观看| 欧美区成人在线视频| 国内揄拍国产精品人妻在线| 成人午夜高清在线视频| 国产精品久久久久久久久免| 伦精品一区二区三区| av中文乱码字幕在线| av在线天堂中文字幕| 亚洲人与动物交配视频| 人妻丰满熟妇av一区二区三区| 999久久久精品免费观看国产| 日本色播在线视频| 欧美性猛交黑人性爽| 一进一出抽搐动态| 国产激情偷乱视频一区二区| 午夜福利在线观看免费完整高清在 | 国产黄色小视频在线观看| aaaaa片日本免费| 日韩欧美在线乱码| 婷婷精品国产亚洲av在线| 久久久久久大精品| 狂野欧美白嫩少妇大欣赏| 99热这里只有是精品50| 国产黄片美女视频| 国产一区二区在线观看日韩| 国产伦人伦偷精品视频| 国产69精品久久久久777片| 欧美+日韩+精品| 精品人妻偷拍中文字幕| 免费高清视频大片| 国产人妻一区二区三区在| 联通29元200g的流量卡| 国产爱豆传媒在线观看| 亚洲国产欧美人成| 午夜激情欧美在线| 亚洲午夜理论影院| 亚洲专区中文字幕在线| 男女边吃奶边做爰视频| 亚洲欧美激情综合另类| netflix在线观看网站| av天堂在线播放| 一夜夜www| 欧洲精品卡2卡3卡4卡5卡区| 欧美区成人在线视频| 精品国产三级普通话版| 亚洲黑人精品在线| 中出人妻视频一区二区| 不卡视频在线观看欧美| 91av网一区二区| 岛国在线免费视频观看| 看黄色毛片网站| 999久久久精品免费观看国产| 亚洲av美国av| 午夜爱爱视频在线播放| 窝窝影院91人妻| 1000部很黄的大片| 欧美精品国产亚洲| 麻豆成人午夜福利视频| 在线播放国产精品三级| 欧美日韩综合久久久久久 | 免费搜索国产男女视频| 日本三级黄在线观看| 亚洲第一区二区三区不卡| 国产精品人妻久久久影院| 毛片女人毛片| 可以在线观看毛片的网站| 久久欧美精品欧美久久欧美| 超碰av人人做人人爽久久| 亚洲欧美精品综合久久99| 国产精品亚洲美女久久久| 日本 av在线| 俺也久久电影网| 麻豆一二三区av精品| 在线观看av片永久免费下载| 亚洲狠狠婷婷综合久久图片| 蜜桃亚洲精品一区二区三区| 欧美不卡视频在线免费观看| 日韩精品有码人妻一区| 亚洲五月天丁香| 久久久精品大字幕| 此物有八面人人有两片| 免费大片18禁| 91精品国产九色| 国产黄片美女视频| 我的女老师完整版在线观看| 国产成人影院久久av| 99精品在免费线老司机午夜| 久久精品人妻少妇| 色综合站精品国产| 美女高潮的动态| 成人国产综合亚洲| 国产精品,欧美在线| 久久午夜亚洲精品久久| 免费人成在线观看视频色| 人人妻人人澡欧美一区二区| 99久久无色码亚洲精品果冻| 精品久久久久久久久久免费视频| 日本免费一区二区三区高清不卡| 亚洲性夜色夜夜综合| 亚洲av不卡在线观看| 又紧又爽又黄一区二区| 变态另类丝袜制服| 欧美色欧美亚洲另类二区| 色综合色国产| 久久久久久久久久黄片| 熟女人妻精品中文字幕| 免费看光身美女| 他把我摸到了高潮在线观看| 美女cb高潮喷水在线观看| 看黄色毛片网站| 最新中文字幕久久久久| 麻豆国产av国片精品| 欧美日本视频| 国产精品av视频在线免费观看| 真人一进一出gif抽搐免费| netflix在线观看网站| 午夜a级毛片| 欧美色视频一区免费| 欧美日本视频| 久久亚洲精品不卡| 99精品久久久久人妻精品| 不卡视频在线观看欧美| 久久中文看片网| 国产精品一区www在线观看 | 麻豆国产97在线/欧美| 亚洲成人久久爱视频| 日韩,欧美,国产一区二区三区 | 欧美性感艳星| 亚洲第一电影网av| 精品一区二区三区人妻视频| 国产国拍精品亚洲av在线观看| 欧美中文日本在线观看视频| av.在线天堂| 日韩欧美免费精品| 国产精品一区二区免费欧美| 国产男靠女视频免费网站| 亚洲五月天丁香| 午夜免费男女啪啪视频观看 | 91麻豆精品激情在线观看国产| 99热6这里只有精品| .国产精品久久| 国产精品日韩av在线免费观看| 欧美3d第一页| 久久精品91蜜桃| 18禁在线播放成人免费| 中文字幕人妻熟人妻熟丝袜美| 男女啪啪激烈高潮av片| 99久久无色码亚洲精品果冻| 琪琪午夜伦伦电影理论片6080| 久久久久性生活片| 欧美三级亚洲精品| 免费观看人在逋| 男女那种视频在线观看| 午夜福利18| 久久九九热精品免费| 国产精品99久久久久久久久| 美女黄网站色视频| 最新在线观看一区二区三区| 中文亚洲av片在线观看爽| 亚洲狠狠婷婷综合久久图片| 久久精品国产亚洲av天美| 中文字幕av成人在线电影| 中国美女看黄片| 欧美日本视频| 97超视频在线观看视频| 欧美3d第一页| 国产老妇女一区| 深爱激情五月婷婷| 国产在线精品亚洲第一网站| 自拍偷自拍亚洲精品老妇| 日本欧美国产在线视频| 亚洲va日本ⅴa欧美va伊人久久| 欧美精品国产亚洲| 亚洲av电影不卡..在线观看| 91久久精品电影网| 在线国产一区二区在线| 自拍偷自拍亚洲精品老妇| 亚洲最大成人手机在线| 黄色日韩在线| 美女xxoo啪啪120秒动态图| 黄色欧美视频在线观看| 亚洲精品在线观看二区| 午夜福利视频1000在线观看| 亚洲成av人片在线播放无| 高清日韩中文字幕在线| 夜夜夜夜夜久久久久| 亚洲一区二区三区色噜噜| 国产在线精品亚洲第一网站| 亚洲美女黄片视频| 久99久视频精品免费| 成人特级黄色片久久久久久久| 亚洲黑人精品在线| 国产免费男女视频| 男女边吃奶边做爰视频| 精品一区二区三区av网在线观看| 色综合亚洲欧美另类图片| 欧美成人免费av一区二区三区| 国产男靠女视频免费网站| 乱系列少妇在线播放| 日本-黄色视频高清免费观看| 一区二区三区免费毛片| 久久久久国产精品人妻aⅴ院| 亚洲性夜色夜夜综合| 看片在线看免费视频| 久久人人爽人人爽人人片va| 真实男女啪啪啪动态图| 男女做爰动态图高潮gif福利片| 国产v大片淫在线免费观看| 亚洲自拍偷在线| 免费在线观看成人毛片| 日韩人妻高清精品专区| 亚洲欧美日韩高清专用| or卡值多少钱| 赤兔流量卡办理| 最近中文字幕高清免费大全6 | 国产黄a三级三级三级人| 中国美白少妇内射xxxbb| 女人十人毛片免费观看3o分钟| 九九在线视频观看精品| 午夜激情欧美在线| 男女下面进入的视频免费午夜| 国产高清三级在线| 嫩草影院精品99| 99久久九九国产精品国产免费| 国产精华一区二区三区| av中文乱码字幕在线| 免费黄网站久久成人精品| 亚洲18禁久久av| 在线观看舔阴道视频| 夜夜爽天天搞| 两个人的视频大全免费| 老司机午夜福利在线观看视频| 久久久久久久久大av| 精品国内亚洲2022精品成人| 校园人妻丝袜中文字幕| 女同久久另类99精品国产91| 少妇人妻精品综合一区二区 | 国产精品国产高清国产av| 男插女下体视频免费在线播放| 国产三级中文精品| 亚洲精品乱码久久久v下载方式| 免费高清视频大片| 久久精品国产亚洲av涩爱 | 欧美zozozo另类| 国产极品精品免费视频能看的| aaaaa片日本免费| 草草在线视频免费看| 亚洲三级黄色毛片| 国产黄色小视频在线观看| 全区人妻精品视频| 两人在一起打扑克的视频| 婷婷六月久久综合丁香| 真人做人爱边吃奶动态| 国产精品久久久久久av不卡| 久久热精品热| 九九爱精品视频在线观看| 哪里可以看免费的av片| 黄色配什么色好看| 麻豆国产av国片精品| 亚洲精品日韩av片在线观看| 亚洲av成人精品一区久久| 俄罗斯特黄特色一大片| 欧美日韩综合久久久久久 | 人妻夜夜爽99麻豆av| 免费看av在线观看网站| 美女高潮喷水抽搐中文字幕| 欧美+日韩+精品| 春色校园在线视频观看| 国产午夜精品久久久久久一区二区三区 | 久99久视频精品免费| 91av网一区二区| 精品一区二区三区av网在线观看| 午夜亚洲福利在线播放| 不卡一级毛片| 特大巨黑吊av在线直播| 变态另类丝袜制服| 伦理电影大哥的女人| 人妻少妇偷人精品九色| 国产主播在线观看一区二区| 可以在线观看毛片的网站| 亚洲av熟女| 成人av一区二区三区在线看| 91麻豆av在线| 国产黄a三级三级三级人| 少妇高潮的动态图| 国产美女午夜福利| 九九久久精品国产亚洲av麻豆| 中文字幕高清在线视频| 成人无遮挡网站| 国产av在哪里看| 国产又黄又爽又无遮挡在线| 亚洲av一区综合| 久久精品91蜜桃| 免费看日本二区| 国产欧美日韩精品亚洲av| 黄色配什么色好看| 可以在线观看的亚洲视频| 国产高清激情床上av| 久久久久久久久中文| 一边摸一边抽搐一进一小说| 亚洲精品一区av在线观看| 精品人妻一区二区三区麻豆 | 国产精品久久视频播放| 神马国产精品三级电影在线观看| 高清在线国产一区| 亚洲性夜色夜夜综合| av.在线天堂| 老司机午夜福利在线观看视频| 长腿黑丝高跟| 精品福利观看| 久久精品国产亚洲网站| 久久久久久久久久黄片| 亚洲最大成人中文| 可以在线观看的亚洲视频| 久久99热这里只有精品18| 国产精品不卡视频一区二区| 毛片女人毛片| 午夜福利欧美成人| 中文字幕高清在线视频| 99riav亚洲国产免费| 国产真实伦视频高清在线观看 | 天美传媒精品一区二区| 日韩欧美 国产精品| 日本三级黄在线观看| 亚洲性夜色夜夜综合| 国产极品精品免费视频能看的| 特大巨黑吊av在线直播| 亚洲av日韩精品久久久久久密| 精品不卡国产一区二区三区| 女人被狂操c到高潮| 99在线人妻在线中文字幕| 一个人看的www免费观看视频| 韩国av在线不卡| 欧美黑人欧美精品刺激| 欧美不卡视频在线免费观看| x7x7x7水蜜桃| 免费不卡的大黄色大毛片视频在线观看 | 国产视频一区二区在线看| 成人鲁丝片一二三区免费| АⅤ资源中文在线天堂| .国产精品久久| 成人鲁丝片一二三区免费| 亚洲内射少妇av| 在线a可以看的网站| 男人狂女人下面高潮的视频| 有码 亚洲区| 国产视频一区二区在线看| 中出人妻视频一区二区| 丰满乱子伦码专区| 亚洲成人免费电影在线观看| 91麻豆av在线| 露出奶头的视频| 国产一区二区三区视频了| 日本三级黄在线观看| 超碰av人人做人人爽久久| 一进一出抽搐gif免费好疼| 级片在线观看| 欧美成人性av电影在线观看| 波多野结衣高清无吗| 午夜精品一区二区三区免费看| 嫩草影院入口| 国产一区二区三区av在线 | 国产成人a区在线观看| 啪啪无遮挡十八禁网站| 最好的美女福利视频网|