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Teoh XY, Goh CF, Aminu N, Chan SY. Quantification of atovaquone from amorphous solid dispersion formulation using HPLC: An in vitro and ex vivo investigation. J Pharm Biomed Anal 2020; 192:113631. [PMID: 33011581 DOI: 10.1016/j.jpba.2020.113631] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2020] [Revised: 08/23/2020] [Accepted: 08/29/2020] [Indexed: 10/23/2022]
Abstract
Atovaquone (ATQ) is a poorly soluble drug. Therefore, formulating ATQ into its supersaturated state through solid dispersion for bioavailability enhancement can be of great value. However, due to fast crystallising properties of ATQ, the quantification of ATQ in a supersaturated solid dispersion system can be complicated. Therefore, in pursuit of accurate quantification of such sample, a simple HPLC analytical method utilising a C18 column (250 × 4.6 mm ID, 5 μm) for the quantitation of ATQ has been developed and validated. Atovaquone elution using the proposed method demonstrated a retention time around 7.6 min with good linearity (R2 > 0.999). The system suitability is also detailed with the tailing factor at 1.365 ± 0.002. The addition of solubilising agent as sample treatment step aided in ensuring the accurate quantitation of the fast crystallising ATQ. The developed HPLC quantitation method has been successfully employed in the analysis of ATQ from solid dispersion samples in in vitro dissolution as well as ex vivo permeation studies for formulation development.
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Affiliation(s)
- Xin-Yi Teoh
- School of Pharmaceutical Sciences, Universiti Sains Malaysia, Penang, Malaysia
| | - Choon Fu Goh
- School of Pharmaceutical Sciences, Universiti Sains Malaysia, Penang, Malaysia
| | - Nafiu Aminu
- School of Pharmaceutical Sciences, Universiti Sains Malaysia, Penang, Malaysia; Faculty of Pharmaceutical Sciences, Usmanu Danfodiyo University, P.M.B, 2346, Sokoto, Nigeria
| | - Siok-Yee Chan
- School of Pharmaceutical Sciences, Universiti Sains Malaysia, Penang, Malaysia.
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Alexovič M, Dotsikas Y, Bober P, Sabo J. Achievements in robotic automation of solvent extraction and related approaches for bioanalysis of pharmaceuticals. J Chromatogr B Analyt Technol Biomed Life Sci 2018; 1092:402-421. [DOI: 10.1016/j.jchromb.2018.06.037] [Citation(s) in RCA: 60] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2018] [Revised: 06/11/2018] [Accepted: 06/17/2018] [Indexed: 12/27/2022]
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3
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Comparative study of some robust statistical methods: weighted, parametric, and nonparametric linear regression of HPLC convoluted peak responses using internal standard method in drug bioavailability studies. Anal Bioanal Chem 2013; 405:4835-48. [DOI: 10.1007/s00216-013-6859-4] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2012] [Revised: 02/12/2013] [Accepted: 02/20/2013] [Indexed: 10/27/2022]
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4
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Wahajuddin, Raju KSR, Taneja I. Bioanalysis of antimalarials using liquid chromatography. Trends Analyt Chem 2013. [DOI: 10.1016/j.trac.2012.09.014] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Gurule S, Goswami D, Khuroo AH, Monif T. LC-APCI mass spectrometric method development and validation for the determination of atovaquone in human plasma. Biomed Chromatogr 2010; 24:497-505. [PMID: 19711297 DOI: 10.1002/bmc.1317] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
A newly developed LC-APCI mass spectrometric method is described for human plasma determination of atovaquone using lapachol internal standard. A single-step protein precipitation technique for plasma extraction of atovaquone achieving mean recovery of 94.17% (CV 8%) without compromising sensitivity (limit of quantitation 50.3 ng/mL) or linearity (50.3 ng/mL-23924.6 ng/mL) is delineated in this paper. Heated nebulizer in negative multiple reaction monitoring mode was employed with transitions m/z 365.2 --> m/z 337.1 and m/z 240.9 --> m/z 185.7 for atovaquone and lapachol respectively in this liquid chromatographic-tandem mass spectrometric method. Excellent chromatographic separation on a Synergi 4 micro Polar-RP 80A (150 x 2.0 mm) column, using 100 microL of plasma extraction volume along with 10 microL of injection load, completing analysis run-time within 2.5 min, highlights this simple yet unique bioanalytical method. The developed method can be successfully applied to pharmacokinetic studies on atovaquone suspension administered in healthy volunteers or HIV-infected patients. Moreover full method validation results not published before are presented and discussed in detail for the first time in this article.
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Affiliation(s)
- Sanjay Gurule
- Department of Clinical Pharmacology and Pharmacokinetics, Ranbaxy Laboratories Ltd, Gurgaon, Haryana, India
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Pingale SG, Nerurkar KK, Padgaonkar AM, Pawar UD, Mangaonkar KV. Determination of Atovaquone in Human Plasma by LC-MS-MS and Its Application to a Bioequivalence Study. Chromatographia 2009. [DOI: 10.1365/s10337-009-1220-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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7
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Asuero AG, González G. Fitting Straight Lines with Replicated Observations by Linear Regression. III. Weighting Data. Crit Rev Anal Chem 2007. [DOI: 10.1080/10408340701244615] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Agustin G. Asuero
- a Department of Analytical Chemistry, Faculty of Pharmacy , The University of Seville , 41012 , Seville , Spain
| | - Gustavo González
- a Department of Analytical Chemistry, Faculty of Pharmacy , The University of Seville , 41012 , Seville , Spain
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Lindegårth N, Funding L, Bergqvist Y. Automated solid-phase extraction method for the determination of atovaquone in capillary blood applied onto sampling paper by rapid high-performance liquid chromatography. JOURNAL OF CHROMATOGRAPHY. B, BIOMEDICAL SCIENCES AND APPLICATIONS 2001; 758:137-44. [PMID: 11486822 DOI: 10.1016/s0378-4347(01)00160-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
A bioanalytical method for the determination of atovaquone in 100 microl blood-spots by solid-phase extraction and high-performance liquid chromatography has been developed and validated. Atovaquone was extracted from the sampling paper in 0.2 M phosphoric acid and a structurally similar internal standard was added with acetonitrile before being loaded onto a C8 end-capped solid-phase extraction column. Atovaquone and internal standard were analysed by high-performance liquid chromatography on a C18 J'Sphere ODS-M80 (150 x 4.0 mm) column with mobile phase acetonitrile-phosphate buffer, 0.01 M, pH 7.0 (65:35, v/v) and UV detection at 277 nm. The intra-assay precision was 2.7% at 12.00 microM and 13.5% at 1.00 microM. The inter-assay precision was 3.3% at 12.00 microM and 15.6% at 1.00 microM. The lower limit of quantification was 1.00 microM. The limit of detection was 0.50 microM.
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Lindegårdh N, Bergqvist Y. Automated solid-phase extraction method for the determination of atovaquone in plasma and whole blood by rapid high-performance liquid chromatography. JOURNAL OF CHROMATOGRAPHY. B, BIOMEDICAL SCIENCES AND APPLICATIONS 2000; 744:9-17. [PMID: 10985561 DOI: 10.1016/s0378-4347(00)00221-8] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A bioanalytical method for the determination of atovaquone in plasma and whole blood by solid-phase extraction and high-performance liquid chromatography has been developed and validated. A structurally similar internal standard was added and protein was precipitated from plasma and whole blood with acetonitrile before being loaded on to a C8 solid-phase extraction column. Atovaquone and internal standard were analysed by high-performance liquid chromatography on a C18 J'Sphere ODS-M80 (150x4.0 mm) column with mobile phase acetonitrile-phosphate buffer, 0.01 M, pH 7.0 (65:35, v/v) and UV detection at 277 nm. The intra-assay precisions for plasma and whole blood were 2.2% and 1.9% respectively at 12 microM and 6.0% and 5.6% respectively at 0.75 microM. The inter-assay precisions for plasma and whole blood were 1.4% and 2.1% respectively at 12 microM and 4.9% and 3.4% respectively at 0.75 microM. The lower limit of quantification in plasma and whole blood were 150 nM. The limit of detection in plasma and whole blood were 30 nM.
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Chou CC, Brown MP, Merritt KA. Capillary zone electrophoresis for the determination of atovaquone in serum. JOURNAL OF CHROMATOGRAPHY. B, BIOMEDICAL SCIENCES AND APPLICATIONS 2000; 742:441-5. [PMID: 10901150 DOI: 10.1016/s0378-4347(00)00183-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
A rapid and simple capillary zone electrophoresis (CZE) method has been developed for the determination of atovaquone in serum. The drug was extracted from equine serum-chloroform (1:3, v/v) at greater than 80% recovery and assayed in buffer containing 25 mM sodium borate (pH 9.1) and 25% acetonitrile. A 100 microm I.D. fused-silica capillary was used and the detection was by UV-diode array at 254 nm; the migration time was approximately 8 min. Intra- and inter-assay variabilities were less than 7.8% and 5.8%, respectively, and the accuracy of the assay (expressed as % bias) ranged from 4.5 to -5.2%. The working assay range was from 2 to 100 microg/ml. This sensitivity could be increased by concentrating during the extraction procedure. Replacement of acetonitrile with 75 mM surfactant 3-(dimethyldodecylammonio)propanesulfonate gave similar sensitivity and provided an additional option to facilitate the separation of atovaquone on multiple-drug samples.
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Affiliation(s)
- C C Chou
- Department of Large Animal and Clinical Sciences, College of Veterinary Medicine, University of Florida, Gainesville 32610, USA.
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Ngo LY, Yogev R, Dankner WM, Hughes WT, Burchett S, Xu J, Sadler B, Unadkat JD. Pharmacokinetics of azithromycin administered alone and with atovaquone in human immunodeficiency virus-infected children. The ACTG 254 Team. Antimicrob Agents Chemother 1999; 43:1516-9. [PMID: 10348786 PMCID: PMC89312 DOI: 10.1128/aac.43.6.1516] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
To evaluate if atovaquone (ATQ) interacts pharmacokinetically with azithromycin (AZ) in human immunodeficiency virus-infected children, 10 subjects (ages, 4 to 13 years) were randomized in a crossover study to receive AZ (5 mg/kg/day) alone (ALONE) or AZ (5 mg/kg/day) and ATQ (30 mg/kg/day) simultaneously (SIM) prior to receiving AZ and ATQ staggered by 12 h. Despite a lack of significant difference in the mean AZ pharmacokinetic parameters, the steady-state values of AZ's area under the concentration-time curve from 0 to 24 h and maximum concentration in serum were consistently lower (n = 7 of 7) for the SIM regimen than they were for the ALONE regimen. A larger study will be required to determine if ATQ affects AZ pharmacokinetics and efficacy in a clinically significant manner.
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Affiliation(s)
- L Y Ngo
- Department of Pharmaceutics, University of Washington, Seattle, Washington 98195, USA
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Hughes W, Dorenbaum A, Yogev R, Beauchamp B, Xu J, McNamara J, Moye J, Purdue L, van Dyke R, Rogers M, Sadler B. Phase I safety and pharmacokinetics study of micronized atovaquone in human immunodeficiency virus-infected infants and children. Pediatric AIDS Clinical Trials Group. Antimicrob Agents Chemother 1998; 42:1315-8. [PMID: 9624466 PMCID: PMC105594 DOI: 10.1128/aac.42.6.1315] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
A phase I dose-escalating safety and pharmacokinetic study evaluated an oral suspension of micronized atovaquone (m-atovaquone) in infants and children stratified into age groups from 1 month to 12 years of age. Dosages of 10, 30, and 45 mg/kg of body weight/day were evaluated as single daily doses over a period of 12 days. Steady-state concentrations in plasma were determined on day 12, and single postdose concentrations were measured on days 1, 3, 5, 7, 9, 13, 15, 18, 21, and 24. Prior studies with adults suggest that the average plasma atovaquone concentration of 15 micrograms/ml is associated with therapeutic success in more than 95% of patients with Pneumocystis carinii pneumonitis. The results showed m-atovaquone to be safe and well tolerated. Dosages of 30 mg/kg/day were adequate to achieve an average steady-state concentration of greater than 15 micrograms/ml in children ages 1 to 3 months and 2 to 12 years, but a dosage of 45 mg/kg/day was needed to reach this concentration in infants 3 to 24 months of age. The oral suspension of atovaquone is safe and well tolerated in children. A single daily dose of 30 mg/kg provides bioavailability considered adequate for therapy of P. carinii pneumonia, but infants between 3 and 24 months of age may require a dosage of 45 mg/kg/day.
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Affiliation(s)
- W Hughes
- St. Jude Children's Research Hospital, Memphis, Tennessee 38105, USA.
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McLoughlin DA, Olah TV, Gilbert JD. A direct technique for the simultaneous determination of 10 drug candidates in plasma by liquid chromatography-atmospheric pressure chemical ionization mass spectrometry interfaced to a Prospekt solid-phase extraction system. J Pharm Biomed Anal 1997; 15:1893-901. [PMID: 9278895 DOI: 10.1016/s0731-7085(96)02011-0] [Citation(s) in RCA: 71] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
New drug candidates are being synthesized at an ever increasing rate and, until recently, the pharmacokinetics of only a few of these could be evaluated. Our laboratory is taking a novel approach to rapid multiple pharmacokinetic screening of potential drug candidates in which mixtures of new substances are co-administered to animals and analyzed simultaneously in plasma using liquid chromatography with tandem MS/MS detection in conjunction with a Prospekt automated on-line solid-phase extraction system. Plasma is sampled via an autosampler and extracted by the Prospekt with the eluent being introduced directly via a reverse phase HPLC column and a heated nebulizer interface to the mass spectrometer. Generic extraction and chromatographic conditions generally give good recoveries. The chromatographic run-times are less than 8 min. The accuracy and precision of these assays are carefully controlled with recoveries generally in the range 80-120% and coefficients of variation less than 20%. Lower quantifiable limits range from 2.5 to 5 ng ml-1. This approach considerably reduces the number of animals needed to screen drug candidates and its power is illustrated by determination of the pharmacokinetics of 10 substances after their simultaneous administration to dogs.
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Affiliation(s)
- D A McLoughlin
- Department of Drug Metabolism, Merck Research Laboratories, West Point, PA 19486, USA
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Tolokán A, Gödörházy L, Horváth V, Hrabéczy-Páll A, Niegreisz Z, Kocsi E, Horvai G, Klebovich I, Balogh-Nemes K. Economic approach to robotic sample pretreatment in high-performance liquid chromatography. J Chromatogr A 1997. [DOI: 10.1016/s0021-9673(97)00186-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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