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Moscoso R, Álvarez-Lueje A, Squella J. Nanostructured interfaces containing MWCNT and nitro aromatics: A new tool to determine Nimesulide. Microchem J 2020. [DOI: 10.1016/j.microc.2020.105361] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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2
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TLC-Densitometric Determination of Five Coxibs in Pharmaceutical Preparations. Processes (Basel) 2020. [DOI: 10.3390/pr8050620] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
A class of drugs called coxibs (COX-2 inhibitors) were created to help relieve pain and inflammation of osteoarthritis and rheumatoid arthritis with the lowest amount of side effects possible. The presented paper describes a new developed, optimized and validated thin layer chromatographic (TLC)-densitometric procedure for the simultaneous assay of five coxibs: celecoxib, etoricoxib, firecoxib, rofecoxib and cimicoxib. Chromatographic separation was conducted on HPTLC F254 silica gel chromatographic plates as a stationary phase using chloroform–acetone–toluene (12:5:2, v/v/v) as a mobile phase. Densitometric detection was carried out at two wavelengths of 254 and 290 nm. The method was tested according to ICH guidelines for linearity, recovery and specificity. The presented method was linear in a wide range of concentrations for all analyzed compounds, with correlation coefficients greater than 0.99. The method is specific, precise (%RSD < 1) and accurate (more than 95%, %RSD < 2). Low-cost, simple and rapid, it can be used in laboratories for drug monitoring and quality control.
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3
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Shetti NP, Shanbhag MM, Malode SJ, Srivastava RK, Reddy KR. Amberlite XAD-4 modified electrodes for highly sensitive electrochemical determination of nimesulide in human urine. Microchem J 2020. [DOI: 10.1016/j.microc.2019.104389] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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4
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Simultaneous quantification of nimesulide, phenylpropanolamine, caffeine and chlorpheniramine in rat plasma by RP–HPLC/PDA method and application to pharmacokinetic studies in healthy rat subjects. ARAB J CHEM 2019. [DOI: 10.1016/j.arabjc.2015.01.011] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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5
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Han X, Guo J, You Y, Yin M, Ren C, Zhan J, Huang W. A fast and accurate way to determine short chain fatty acids in mouse feces based on GC–MS. J Chromatogr B Analyt Technol Biomed Life Sci 2018; 1099:73-82. [DOI: 10.1016/j.jchromb.2018.09.013] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2018] [Revised: 08/24/2018] [Accepted: 09/11/2018] [Indexed: 12/20/2022]
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Nagulakonda NVVSSNM, Ananthula RS, Susarla KPC, Krishnamurthy T, Gollapalli NR. Quantification and In Silico Toxicity Assessment of Nimesulide and its Related Substances. J Chromatogr Sci 2017; 55:508-517. [DOI: 10.1093/chromsci/bmx003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2016] [Indexed: 11/12/2022]
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7
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Liu M, Yu Q, Li P, Zhu M, Fang M, Sun B, Sun M, Sun Y, Zhang P, He Z, Sun J, Wang Y, Liu X. Simultaneous determination of parecoxib sodium and its active metabolite valdecoxib in rat plasma by UPLC-MS/MS and its application to a pharmacokinetic study after intravenous and intramuscular administration. J Chromatogr B Analyt Technol Biomed Life Sci 2016; 1022:220-229. [PMID: 27107851 DOI: 10.1016/j.jchromb.2016.04.009] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2016] [Accepted: 04/05/2016] [Indexed: 02/02/2023]
Abstract
In this study, we developed and validated a new, rapid, specific and sensitive ultra-performance liquid chromatography-tandem mass spectrometric (UPLC-MS/MS) method to simultaneously determine parecoxib sodium (PX) and its active metabolite, valdecoxib (VX), in rat plasma. Plasma samples were prepared by plasma protein precipitation combined with a liquid-liquid extraction method. The separation was carried out on a Kinetex C18 column (2.1mm×50mm, 2.6μm) with a gradient elution using methanol (A) and a 2mM ammonium acetate aqueous solution (B). The analysis was performed in less than 3min with a flow rate of 0.2mL/min. Ketoprofen was used as an internal standard (IS). Mass spectrometric detection was conducted with a triple quadrupole detector equipped with electrospray ionization in the negative ion mode (ESI(-)) using multiple reaction monitoring (MRM). The calibration curves were linear over the concentration ranges of 5-4000ng/mL for PX and 5-2000ng/mL for VX with all correlation coefficients greater than 0.998. The intra- and inter-day relative standard deviations (RSD) for both analytes were within 15% and the accuracy was within 85-115% at all quality control levels. The mean extraction recoveries for all analytes obtained from three concentrations of QC plasma samples were more than 89.0% efficient. Selectivity, matrix effect, dilution integrity and stability were also validated. The method was successfully used to investigate the pharmacokinetics of PX and VX in rat plasma after intravenous and intramuscular administration of PX.
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Affiliation(s)
- Meina Liu
- Department of Biopharmaceutics, School of Pharmacy, Shenyang Pharmaceutical University, Wenhua Road, Shenyang 110016, China
| | - Qiuyang Yu
- Department of Pharmaceutical Analysis, School of Pharmacy, Shenyang Pharmaceutical University, Wenhua Road, Shenyang 110016, China
| | - Ping Li
- Department of Biopharmaceutics, School of Pharmacy, Shenyang Pharmaceutical University, Wenhua Road, Shenyang 110016, China
| | - Meng Zhu
- Department of Biopharmaceutics, School of Pharmacy, Shenyang Pharmaceutical University, Wenhua Road, Shenyang 110016, China
| | - Mingming Fang
- Department of Biopharmaceutics, School of Pharmacy, Shenyang Pharmaceutical University, Wenhua Road, Shenyang 110016, China
| | - Bingjun Sun
- Department of Biopharmaceutics, School of Pharmacy, Shenyang Pharmaceutical University, Wenhua Road, Shenyang 110016, China
| | - Mengchi Sun
- Department of Biopharmaceutics, School of Pharmacy, Shenyang Pharmaceutical University, Wenhua Road, Shenyang 110016, China
| | - Yinghua Sun
- Department of Biopharmaceutics, School of Pharmacy, Shenyang Pharmaceutical University, Wenhua Road, Shenyang 110016, China
| | - Peng Zhang
- Department of Pharmaceutical Analysis, School of Pharmacy, Shenyang Pharmaceutical University, Wenhua Road, Shenyang 110016, China
| | - Zhonggui He
- Department of Biopharmaceutics, School of Pharmacy, Shenyang Pharmaceutical University, Wenhua Road, Shenyang 110016, China
| | - Jin Sun
- Department of Biopharmaceutics, School of Pharmacy, Shenyang Pharmaceutical University, Wenhua Road, Shenyang 110016, China
| | - Yongjun Wang
- Department of Biopharmaceutics, School of Pharmacy, Shenyang Pharmaceutical University, Wenhua Road, Shenyang 110016, China
| | - Xiaohong Liu
- Department of Biopharmaceutics, School of Pharmacy, Shenyang Pharmaceutical University, Wenhua Road, Shenyang 110016, China.
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8
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Patel NS, Nandurbarkar VP, Patel AJ, Patel SG. Simultaneous spectrophotometric determination of celecoxib and diacerein in bulk and capsule by absorption correction method and chemometric methods. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2014; 125:46-52. [PMID: 24530708 DOI: 10.1016/j.saa.2014.01.036] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2013] [Revised: 12/28/2013] [Accepted: 01/08/2014] [Indexed: 06/03/2023]
Abstract
Two methods, absorption correction and multivariate spectrophotometric methods were developed for simultaneous estimation of Celecoxib (CEL) and Diacerein (DIA) in combined dosage form. Absorption correction method involves direct estimation of DIA at wavelength 341 nm in which CEL has zero absorbance and shows no interference. For estimation of CEL, corrected absorbance was calculated at 253 nm due to the interference of DIA at this wavelength. Linearity was observed in the range of 6-22 μg mL(-1) for CEL and 3-11 μg mL(-1) for DIA. The method was validated as per ICH guidelines. Chemometric methods including classical least square (CLS), inverse least square (ILS), principal component regression (PCR) and partial least square (PLS) were studied for simultaneous determination of CEL and DIA in capsule using spectrophotometry. A set of 25 standard mixtures containing both drugs were prepared in range of 5-25 μg mL(-1) for CEL and 3-15 μg mL(-1) for DIA. Analytical figure of merit (FOM), such as sensitivity, selectivity, analytical sensitivity, limit of detection and limit of quantitation were determined for chemometric methods. The proposed methods were applied for determination of two components from combined dosage form.
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Affiliation(s)
- N S Patel
- Department of Pharmaceutical Chemistry and Analysis, Ramanbhai Patel College of Pharmacy, CHARUSAT University, Changa, Gujarat, India.
| | - V P Nandurbarkar
- Department of Mathematics, P.D. Patel Institute, CHARUSAT University, Changa, Gujarat, India
| | - A J Patel
- Department of Pharmaceutical Chemistry, K.B. Institute of Pharmaceutical Education and Research, KSV University, Gandhinagar, Gujarat, India
| | - S G Patel
- Department of Pharmaceutical Chemistry and Analysis, Ramanbhai Patel College of Pharmacy, CHARUSAT University, Changa, Gujarat, India
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9
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Sethi N, Anand A, Chandrul KK, Jain G, Srinivas KS. Development and validation of a stability-indicating RP-UPLC method for the quantitative analysis of nabumetone in tablet dosage form. J Chromatogr Sci 2012; 50:85-90. [PMID: 22298755 DOI: 10.1093/chromsci/bmr001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
High efficiency and less run time are the basic requirements of high-speed chromatographic separations. To fulfill these requirements, a new separation technique, ultra-performance liquid chromatography (UPLC), has shown promising developments. A rapid, specific, sensitive, and precise reverse-phase UPLC method is developed for the determination of nabumetone in tablet dosage form. In this work, a new isocratic chromatographic method is developed. The newly developed method is applicable for assay determination of the active pharmaceutical ingredient. The chromatographic separation is achieved on a Waters Acquity BEH column (100 mm, i.d., 2.1 mm, 1.7 µm) within a short runtime of 2 min using a mobile phase of 5 mM ammonium acetate-acetonitrile (25:75, v/v), at a flow rate of 0.3 mL/min at an ambient temperature. Quantification is achieved with photodiode array detection at 230 nm, over the concentration range of 0.05-26 µg/mL. Forced degradation studies are also performed for nabumetone bulk drug samples to demonstrate the stability-indicating power of the UPLC method. Comparison of system performance with conventional high-performance liquid chromatography is made with respect to analysis time, efficiency, and sensitivity. The method is validated according to the ICH guidelines and is applied successfully for the determination of nabumetone in tablets.
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Affiliation(s)
- Neha Sethi
- School of Pharmaceutical Sciences, Jaipur National University, Jaipur, India.
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10
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Starek M. Review of the applications of different analytical techniques for coxibs research. Talanta 2011; 85:8-27. [DOI: 10.1016/j.talanta.2011.04.052] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2010] [Revised: 04/15/2011] [Accepted: 04/19/2011] [Indexed: 10/18/2022]
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11
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Zacharis CK, Tzanavaras PD. HPLC Separation of Nimesulide and Five Impurities using a Narrow-Bore Monolithic Column: Application to Photo-Degradation Studies. Chromatographia 2011. [DOI: 10.1007/s10337-010-1876-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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12
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Starek M, Rejdych M. Densitometric analysis of celecoxib, etoricoxib and valdecoxib in pharmaceutical preparations. JPC-J PLANAR CHROMAT 2009. [DOI: 10.1556/jpc.22.2009.6.2] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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13
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Zitova A, Hynes J, Kollar J, Borisov SM, Klimant I, Papkovsky DB. Analysis of activity and inhibition of oxygen-dependent enzymes by optical respirometry on the LightCycler system. Anal Biochem 2009; 397:144-51. [PMID: 19849999 DOI: 10.1016/j.ab.2009.10.029] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2009] [Revised: 10/06/2009] [Accepted: 10/15/2009] [Indexed: 11/15/2022]
Abstract
There is currently a need for a method capable of measuring the activity and inhibition of biologically relevant oxygenases in a format that enables the convenient, fast, and cost-efficient generation of dose-response information. Here we describe a low-volume luminescence-based assay for the measurement of such oxygen-dependent enzymes. The assay employs a photoluminescent oxygen-sensitive probe and glass capillary microcuvettes measured on the Roche LightCycler detection platform. Three discrete types of oxygen probe were evaluated for this application: (i) solid-state coatings, (ii) soluble macromolecular MitoXpress probe, both phosphorescent porphyrin-based, and (iii) a luminescent Ir(III)-based nanoparticle probe. Measurement parameters were optimised and subsequently applied to the analysis of three biologically relevant oxygenases, namely cytochrome P450 (CYP), monoamine oxygenase (MAO), and cyclooxygenase (COX). CYP enzymes are central players in drug detoxification while specific inhibitors of MAO and COX are important for therapeutic intervention and treatment of neurological and inflammatory diseases, respectively. To determine assay utility, oxygen consumption catalysed by all three enzyme types was measured and the effect of specific inhibitors determined. The panel included the MAO-A/B inhibitors clorgyline, toloxatone, deprenyl, and the COX-1/2 inhibitors niflumic acid, nimesulide, SC-560, ketoprofen, and phenylbutazone. IC(50) values were then compared with literature values. The measurement methodology described allows the low-volume analysis of biologically relevant oxygenases and displays the requisite sensitivity and throughput to facilitate routine analysis. It is also applicable to other O(2)-dependent enzymes and enzymatic systems.
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Affiliation(s)
- Alice Zitova
- Department of Biochemistry, University College Cork, Cavanagh Pharmacy Building, Cork, Ireland
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14
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Starek M, Krzek J, Dechnik J. Separation and determination of rofecoxib and its degradation products by TLC chromatography. JOURNAL OF ANALYTICAL CHEMISTRY 2009. [DOI: 10.1134/s106193480906015x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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15
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Taha EA, Salama NN, Wang S. Micelle enhanced fluorimetric and thin layer chromatography densitometric methods for the determination of (+/-) citalopram and its S-enantiomer escitalopram. ANALYTICAL CHEMISTRY INSIGHTS 2009; 4:1-9. [PMID: 19652757 PMCID: PMC2716673 DOI: 10.4137/aci.s2274] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Two sensitive and validated methods were developed for determination of a racemic mixture citalopram and its enantiomer S-(+) escitalopram. The first method was based on direct measurement of the intrinsic fluorescence of escitalopram using sodium dodecyl sulfate as micelle enhancer. This was further applied to determine escitalopram in spiked human plasma, as well as in the presence of common and co-administrated drugs. The second method was TLC densitometric based on various chiral selectors was investigated. The optimum TLC conditions were found to be sensitive and selective for identification and quantitative determination of enantiomeric purity of escitalopram in drug substance and drug products. The method can be useful to investigate adulteration of pure isomer with the cheap racemic form.
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Affiliation(s)
- Elham A Taha
- National Organization for Drug Control and Research (NODCAR), 6-Abu Hazem Street, Pyramids Ave. P.O. Box 29, 35521 Giza, Egypt.
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16
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Separation and determination of nimesulide related substances for quality control purposes by micellar electrokinetic chromatography. J Pharm Biomed Anal 2009; 49:201-6. [DOI: 10.1016/j.jpba.2008.10.023] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2008] [Revised: 10/15/2008] [Accepted: 10/17/2008] [Indexed: 11/22/2022]
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17
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Patel BN, Sharma N, Sanyal M, Prasad A, Shrivastav PS. High-throughput LC-MS/MS assay for 6-methoxy-2-naphthylacetic acid, an active metabolite of nabumetone in human plasma and its application to bioequivalence study. Biomed Chromatogr 2008; 22:1213-24. [DOI: 10.1002/bmc.1047] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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18
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Chandran S, Ravi P, Jadhav PR, Saha RN. A Simple, Rapid, and Validated LC Method for the Estimation of Nimesulide in Human Serum and Its Application in Bioavailability Studies. ANAL LETT 2008. [DOI: 10.1080/00032710802352480] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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19
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Navas N, Ureña R, Capitan-Vallvey LF. Determination of Celecoxib, Rofecoxib, Sodium Diclofenac and Niflumic Acid in Human Serum Samples by HPLC with DAD Detection. Chromatographia 2007. [DOI: 10.1365/s10337-007-0445-x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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20
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Dalmora SL, Fronza M, Nogueira DR, Souto RB, Bernardi RM. Simultaneous Determination of Nimesulide and Valdecoxib by Micellar Electrokinetic Capillary Chromatography Method. J LIQ CHROMATOGR R T 2007. [DOI: 10.1080/10826070701588588] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- Sérgio Luiz Dalmora
- a Department of Industrial Pharmacy , Health Science Centre, Federal University of Santa Maria , Santa Maria‐RS, Brazil
| | - Márcio Fronza
- a Department of Industrial Pharmacy , Health Science Centre, Federal University of Santa Maria , Santa Maria‐RS, Brazil
| | - Daniele Rubert Nogueira
- a Department of Industrial Pharmacy , Health Science Centre, Federal University of Santa Maria , Santa Maria‐RS, Brazil
| | - Ricardo Bizogne Souto
- a Department of Industrial Pharmacy , Health Science Centre, Federal University of Santa Maria , Santa Maria‐RS, Brazil
| | - Raquel Martini Bernardi
- a Department of Industrial Pharmacy , Health Science Centre, Federal University of Santa Maria , Santa Maria‐RS, Brazil
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Kvaternick V, Malinski T, Wortmann J, Fischer J. Quantitative HPLC-UV method for the determination of firocoxib from horse and dog plasma. J Chromatogr B Analyt Technol Biomed Life Sci 2007; 854:313-9. [PMID: 17537684 DOI: 10.1016/j.jchromb.2007.04.037] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2006] [Revised: 03/14/2007] [Accepted: 04/24/2007] [Indexed: 12/01/2022]
Abstract
A sensitive reversed-phase HPLC-UV method was developed for the determination of firocoxib, a novel and highly selective COX-2 inhibitor, in plasma. A 1.0 mL dog or horse plasma sample is mixed with water and passed through a hydrophobic-lipophilic copolymer solid-phase extraction column to isolate firocoxib. Quantitation is based on an external standard curve. The method has a validated limit of quantitation of 25 ng/mL and a limit of detection of 10 ng/mL. The validated upper limit of quantitation was 2500 ng/mL for horses and 10,000 ng/mL for dogs. The average recoveries ranged from 88-93% for horse plasma and 96-103% for dog plasma. The coefficient of variation in all cases was less than 10%. This method is suitable for the analysis of clinical samples from pharmacokinetic and bioequivalence studies and drug monitoring.
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Affiliation(s)
- Valerie Kvaternick
- Merial Limited, Pharmacokinetics and Drug Metabolism, 631 Route 1, North Brunswick, NJ 08902, USA.
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22
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Zhao G, Liu JF, Nyman M, Jönsson JA. Determination of short-chain fatty acids in serum by hollow fiber supported liquid membrane extraction coupled with gas chromatography. J Chromatogr B Analyt Technol Biomed Life Sci 2006; 846:202-8. [PMID: 17070116 DOI: 10.1016/j.jchromb.2006.09.027] [Citation(s) in RCA: 83] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2006] [Revised: 08/25/2006] [Accepted: 09/01/2006] [Indexed: 10/24/2022]
Abstract
A method based on hollow fiber supported liquid membrane extraction coupled with a gas chromatograph equipped with flame ionization detector (GC-FID) was developed for the determination of six short-chain fatty acids including acetic acid, propionic acid, i-butyric acid, n-butyric acid, i-valeric acid and n-valeric acid in serum. Hollow fiber supported liquid membrane extraction was employed for preconcentration and clean-up of the samples. The fatty acids were extracted from the acidic donor (diluted serum) into a liquid membrane formed in the wall of the hollow fiber with 10% tri-n-octylphoshphine oxide (TOPO) in di-n-hexyl ether, and then extracted back into a basic acceptor solution filled in the lumen of the hollow fiber. After being acidified with HCl, the acceptor was directly analyzed by GC-FID. The acceptor concentration, donor pH, membrane liquid and extracting time were optimized giving an enrichment factor up to 155 times. The good linearity (r(2)>0.980), reasonable recovery (87.2-121%), and satisfactory intra-assay (8.2-11.5%) and inter-assay (6.1-11.6%) precision illustrated the good performance of the present method. Limits of detection (LOD) ranged from 0.04 to 0.24 microM and limits of quantification (LOQ) varied from 0.13 to 0.80 microM.
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Affiliation(s)
- Guohua Zhao
- Food College of Southwest University, Beibei 400715, Chongqing, PR China
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23
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Zhao G, Nyman M, Jönsson JA. Rapid determination of short-chain fatty acids in colonic contents and faeces of humans and rats by acidified water-extraction and direct-injection gas chromatography. Biomed Chromatogr 2006; 20:674-82. [PMID: 16206138 DOI: 10.1002/bmc.580] [Citation(s) in RCA: 350] [Impact Index Per Article: 19.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Short-chain fatty acids (SCFAs) have attracted much attention recently because of their positive physiological effects. In this work, a rapid and reliable gas chromatographic method for determination of eight SCFAs, in colonic and faecal samples from rats and humans has been developed and validated. The methodology involves extraction of the SCFAs in water before a direct injection procedure on a FFAP capillary column. A stock standard solution containing acetic acid, propionic acid, n-butyric acid, i-butyric acid, n-valeric acid, i-valeric acid, n-caproic acid and n-heptanoic acid was prepared and used. A high linearity (r2 > 0.9990), low quantification limit (2.38-30.14 microm) and high recovery for most acids were obtained. Acidification of faecal samples was found to be crucial for quantitative determination of the SCFAs, and adjustment of pH to 2-3 was regarded as necessary. Glass wool inserted in the glass liner of the injection port proved effective in preventing the contamination of the column by non-volatiles, and 12% formic acid reduced the ghost peak that appeared gradually after several injections. After validation, the methodology was applied on two faecal samples from rats fed diets containing different amount of dietary fibre and one faecal sample from human fed a normal diet to test the accuracy of the developed method.
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Affiliation(s)
- Guohua Zhao
- Applied Nutrition and Food Chemistry, Center for Chemistry and Chemical Engineering, Lund University, PO Box 124, SE-221 00 Lund, Sweden
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Hsieh YH, Lin SJ, Chen SH. Simultaneous determination of celecoxib, meloxicam, and rofecoxib using capillary electrophoresis with surfactant and application in drug formulations. J Sep Sci 2006; 29:1009-17. [PMID: 16833234 DOI: 10.1002/jssc.200500412] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
A simple and selective CE using surfactant with UV detection is described for the simultaneous determination of selective cyclooxygenase-2 inhibitors, celecoxib, meloxicam, and rofecoxib. The simultaneous analysis of celecoxib, meloxicam, and rofecoxib was performed in Tris buffer (10 mM; pH 11) with 60 mM sodium octane-sulfonate and 20% ACN as an anionic surfactant and organic modifier, respectively. Under this condition, good separation with high efficiency and the required short analysis time is achieved. The linear ranges of the method for the determination of celecoxib, meloxicam, and rofecoxib were over 5-100 microg/mL; the detection limits at 200 nm (S/N = 3; injection 3.45 kPa, 5 s) were 2, 1, and 1 microg/mL, respectively. The small amount of sample required and the expeditiousness of the procedure allow content uniformity to be determined in individual pharmaceutical products.
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Affiliation(s)
- Ya-Hui Hsieh
- Graduate Institute of Pharmaceutical Sciences, Kaohsiung Medical University, Kaohsiung, Taiwan
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Nageswara Rao R, Meena S, Raghuram Rao A. An overview of the recent developments in analytical methodologies for determination of COX-2 inhibitors in bulk drugs, pharmaceuticals and biological matrices. J Pharm Biomed Anal 2005; 39:349-63. [PMID: 16009523 DOI: 10.1016/j.jpba.2005.03.040] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2004] [Revised: 03/16/2005] [Accepted: 03/20/2005] [Indexed: 02/02/2023]
Abstract
An extensive survey of the literature published in various analytical and pharmaceutical chemistry related journals has been conducted and the instrumental analytical methods which were developed and used for determination of COX-2 inhibitors in bulk drugs, formulations and biological fluids have been reviewed. This review covers the time period from 1995 to 2004 during which 138 analytical methods including all types of spectrophotometric and chromatographic techniques were reported. HPLC with UV detection was found to be the technique of choice for many workers and more than 100 methods were based on LC and UV. A critical analysis of the reported data has been carried out and the present state-of-art of the analytical techniques for determination of celecoxib, rofecoxib, etoricoxib, etodolac, nimesulide and meloxicam has been discussed.
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Affiliation(s)
- R Nageswara Rao
- Analytical Division, Discovery Lab, Indian Institute of Chemical Technology, Tarnaka, Hyderabad 500007, India.
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