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Dos Santos ECF, Andrade de Lima JM, Barbosa Machado JC, Assunção Ferreira MR, Lira Soares LA. Validation of stability-indicating LC method, degradation study, and impact on antioxidant and antifungal activities of Eugenia uniflora leaves extract. Biomed Chromatogr 2023; 37:e5723. [PMID: 37581307 DOI: 10.1002/bmc.5723] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2023] [Revised: 07/24/2023] [Accepted: 07/28/2023] [Indexed: 08/16/2023]
Abstract
The aim of this study is to demonstrate the stability-indicating capacity of an analytical method for Eugenia uniflora, enhance understanding of the stability of myricitrin, and assess the effect of degradation of spray-dried extract (SDE) on antioxidant and antifungal activities. Validation of the stability-indicating method was carried out through a forced degradation study of SDE and standard myricitrin. The antioxidant and antifungal activities of SDE were evaluated both before and after degradation. The quantification method described was found to be both accurate and precise in measuring myricitrin levels in SDE from E. uniflora, with excellent selectivity that confirmed its stability-indicating capability. The forced degradation study revealed that the marker myricitrin is sensitive to hydrolysis, but generally stable under other stress conditions. By contrast, the standard myricitrin displayed greater susceptibility to degradation under forced degradation conditions. Analysis of the antioxidant activity of SDE before and after degradation showed a negative impact in this activity due to degradation, while no significant effect was observed on antifungal activity. The method described can be a valuable tool in the quality control of E. uniflora, and the findings can assist in determining the optimal conditions and storage of products derived from this species.
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Affiliation(s)
- Ewelyn Cintya Felipe Dos Santos
- Laboratory of Pharmacognosy, Department of Pharmaceutical Sciences, Federal University of Pernambuco, Recife, Pernambuco, Brazil
- Post-Graduate Program in Pharmaceutical Sciences, Federal University of Pernambuco, Recife, Pernambuco, Brazil
| | - Juliana Morais Andrade de Lima
- Laboratory of Pharmacognosy, Department of Pharmaceutical Sciences, Federal University of Pernambuco, Recife, Pernambuco, Brazil
| | - Janaína Carla Barbosa Machado
- Laboratory of Pharmacognosy, Department of Pharmaceutical Sciences, Federal University of Pernambuco, Recife, Pernambuco, Brazil
- Post-Graduate Program in Pharmaceutical Sciences, Federal University of Pernambuco, Recife, Pernambuco, Brazil
| | - Magda Rhayanny Assunção Ferreira
- Laboratory of Pharmacognosy, Department of Pharmaceutical Sciences, Federal University of Pernambuco, Recife, Pernambuco, Brazil
| | - Luiz Alberto Lira Soares
- Laboratory of Pharmacognosy, Department of Pharmaceutical Sciences, Federal University of Pernambuco, Recife, Pernambuco, Brazil
- Post-Graduate Program in Pharmaceutical Sciences, Federal University of Pernambuco, Recife, Pernambuco, Brazil
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Jongjitphisut N, Thitikornpong W, Wichitnithad W, Thanusuwannasak T, Vajragupta O, Rojsitthisak P. A Stability-Indicating Assay for Tetrahydrocurcumin-Diglutaric Acid and Its Applications to Evaluate Bioaccessibility in an In Vitro Digestive Model. Molecules 2023; 28:molecules28041678. [PMID: 36838664 PMCID: PMC9966976 DOI: 10.3390/molecules28041678] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2022] [Revised: 01/31/2023] [Accepted: 02/07/2023] [Indexed: 02/12/2023] Open
Abstract
A simple and reliable ultra-high-performance liquid chromatographic (UHPLC) method was developed and validated for determination of tetrahydrocurcumin diglutaric acid (TDG) and applied for evaluation of its bioaccessibility. The analytical method was validated to demonstrate as a stability-indicating assay (SIA) according to the ICH Q2(R1) guidelines under various force degradation conditions including thermal degradation, moisture, acid and base hydrolysis, oxidation, and photolysis. The developed chromatographic condition could completely separate all degradants from the analyte of interest. The method linearity was verified in the range of 0.4-12 μg/mL with the coefficient of determination (r2) > 0.995. The accuracy and precision of the method provided %recovery in the range of 98.9-104.2% and %RSD lower than 4.97%, respectively. The limit of detection and quantitation were found to be 0.25 μg/mL and 0.40 μg/mL, respectively. This method has been successfully applied for the bioaccessibility assessment of TDG with the bioaccessibility of TDG approximately four fold greater than THC in simulated gastrointestinal fluid. The validated SIA method can also benefit the quality control of TDG raw materials in pharmaceutical and nutraceutical development.
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Affiliation(s)
- Nattapong Jongjitphisut
- Pharmaceutical Sciences and Technology Program, Faculty of Pharmaceutical Sciences, Chulalongkorn University, Bangkok 10330, Thailand
- Government Pharmaceutical Organization, Bangkok 10400, Thailand
| | - Worathat Thitikornpong
- Center of Excellence in Natural Products for Ageing and Chronic Diseases, Chulalongkorn University, Bangkok 10330, Thailand
- Department of Food and Pharmaceutical Chemistry, Faculty of Pharmaceutical Sciences, Chulalongkorn University, Bangkok 10330, Thailand
- Correspondence: ; Tel.: +66-2-218-8315; Fax: +66-2-254-5195
| | - Wisut Wichitnithad
- Department of Analytical and Clinical Development, Pharma Nueva Co., Ltd., Bangkok 10900, Thailand
| | - Thanundorn Thanusuwannasak
- CU Drug and Health Products Innovation Promotion Center, Faculty of Pharmaceutical Sciences, Chulalongkorn University, Bangkok 10330, Thailand
| | - Opa Vajragupta
- Center of Excellence in Natural Products for Ageing and Chronic Diseases, Chulalongkorn University, Bangkok 10330, Thailand
- Molecular Probes for Imaging Research Network, Faculty of Pharmaceutical Sciences, Chulalongkorn University, Bangkok 10330, Thailand
| | - Pornchai Rojsitthisak
- Center of Excellence in Natural Products for Ageing and Chronic Diseases, Chulalongkorn University, Bangkok 10330, Thailand
- Department of Food and Pharmaceutical Chemistry, Faculty of Pharmaceutical Sciences, Chulalongkorn University, Bangkok 10330, Thailand
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Lauberte L, Ponomarenko J, Arshanitsa A. Screening method for chromatographic analysis of diarylheptanoids in alder bark extracts. J Pharm Biomed Anal 2022; 214:114727. [DOI: 10.1016/j.jpba.2022.114727] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2021] [Revised: 03/10/2022] [Accepted: 03/13/2022] [Indexed: 11/28/2022]
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Apiratikul N, Sriklung K, Dolsophon K, Thamvapee P, Watanapokasin R, Yingyongnarongkul B, Niyomtham N, Bremner JB, Watanavetch P, Samosorn S. Enhancing Anticancer Potency of a 13-Substituted Berberine Derivative with Cationic Liposomes. Chem Pharm Bull (Tokyo) 2022; 70:420-426. [PMID: 35342147 DOI: 10.1248/cpb.c21-01049] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Cationic liposomal formulations of the telomeric G-quadruplex stabilizing ligand, 13-(2-naphthylmethoxy)berberine bromide (1), have been developed with the purpose of delivering 1 into the nucleus of cancer cells for potential telomere targeting. Berberine derivative 1 was encapsulated in various cationic lipids 2-4 by the thin film evaporation method; these lipids are cationic after amine protonation. The most appropriate liposomal berberine formulation was that of 1 and the cholesterol derived cationic lipid 4 in a weight ratio of 1:20 with 76.5% encapsulation efficiency of 1. Cellular uptake studies in the HeLa and HT-29 cancer cells line showed that the liposomal berberine derivative uptake in the cells was higher and more stable than for berberine derivative 1 alone while free 1 was completely decomposed in the cells within 60 min exposure to the cells. Anticancer activity of the liposomal berberine derivative 1 based on 4 was greater than that for the free berberine derivative 1 in the MCF-7, HeLa and HT-29 cell line by 2.3-, 4.9- and 5.3-fold, respectively, and also, interestingly, superior to the anticancer drug doxorubicin against the HT29 cancer cell line.
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Affiliation(s)
- Nuttapon Apiratikul
- Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Srinakharinwirot University
| | - Kanlayanee Sriklung
- Department of Biochemistry, Faculty of Medicine, Srinakharinwirot University
| | - Kulvadee Dolsophon
- Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Srinakharinwirot University
| | | | | | - Boonek Yingyongnarongkul
- Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Ramkhamhaenng University
| | | | - John B Bremner
- School of Chemistry and Molecular Bioscience, Faculty of Science, Medicine and Health, University of Wollongong
| | - Petcharat Watanavetch
- Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Srinakharinwirot University
| | - Siritron Samosorn
- Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Srinakharinwirot University
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Jithavech P, Suwattananuruk P, Hasriadi, Muangnoi C, Thitikornpong W, Towiwat P, Vajragupta O, Rojsitthisak P. Physicochemical investigation of a novel curcumin diethyl γ-aminobutyrate, a carbamate ester prodrug of curcumin with enhanced anti-neuroinflammatory activity. PLoS One 2022; 17:e0265689. [PMID: 35303012 PMCID: PMC9048745 DOI: 10.1371/journal.pone.0265689] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2021] [Accepted: 03/05/2022] [Indexed: 12/28/2022] Open
Abstract
Curcumin is a polyphenol compound that alleviates several neuroinflammation-related diseases including Alzheimer's disease, Parkinson's disease, multiple sclerosis, epilepsy and cerebral injury. However, the therapeutic efficacy of curcumin is limited by its poor physicochemical properties. The present study aimed to develop a new carrier-linked curcumin prodrug, curcumin diethyl γ-aminobutyrate (CUR-2GE), with improved physicochemical and anti-neuroinflammatory properties. CUR-2GE was designed and synthesized by conjugating curcumin with gamma-aminobutyric acid ethyl ester (GE) via a carbamate linkage. The carbamate linkage was selected to increase stability at acidic pH while GE served as a promoiety for lipophilic enhancement. The synthesized CUR-2GE was investigated for solubility, partition coefficient, stability, and bioconversion. The solubility of CUR-2GE was less than 0.05 μg/mL similar to that of curcumin, while the lipophilicity with log P of 3.57 was significantly increased. CUR-2GE was resistant to chemical hydrolysis at acidic pH (pH 1.2 and 4.5) as anticipated but rapidly hydrolyzed at pH 6.8 and 7.4. The incomplete hydrolysis of CUR-2GE was observed in simulated gastrointestinal fluids which liberated the intermediate curcumin monoethyl γ-aminobutyric acid (CUR-1GE) and the parent curcumin. In plasma, CUR-2GE was sequentially converted to CUR-1GE and curcumin within 1 h. In lipopolysaccharide (LPS)-stimulated BV-2 microglial cells, CUR-2GE effectively attenuated the pro-inflammatory mediators by decreasing the secretion of nitric oxide and cytokines (TNF-α and IL-6) to a greater extent than curcumin due to an increase in cellular uptake. Altogether, the newly developed acid-stable CUR-2GE prodrug is a potential pre-clinical and clinical candidate for further evaluation on neuroprotective and anti-neuroinflammatory effects.
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Affiliation(s)
- Ponsiree Jithavech
- Center of Excellence in Natural Products for Ageing and Chronic Diseases,
Chulalongkorn University, Bangkok, Thailand
- Department of Food and Pharmaceutical Chemistry, Faculty of
Pharmaceutical Sciences, Chulalongkorn University, Bangkok,
Thailand
| | - Piyapan Suwattananuruk
- Center of Excellence in Natural Products for Ageing and Chronic Diseases,
Chulalongkorn University, Bangkok, Thailand
- Pharmaceutical Sciences and Technology Program, Faculty of Pharmaceutical
Sciences, Chulalongkorn University, Bangkok, Thailand
| | - Hasriadi
- Pharmaceutical Sciences and Technology Program, Faculty of Pharmaceutical
Sciences, Chulalongkorn University, Bangkok, Thailand
| | - Chawanphat Muangnoi
- Cell and Animal Model Unit, Institute of Nutrition, Mahidol University,
Nakhon Pathom, Thailand
| | - Worathat Thitikornpong
- Center of Excellence in Natural Products for Ageing and Chronic Diseases,
Chulalongkorn University, Bangkok, Thailand
- Department of Food and Pharmaceutical Chemistry, Faculty of
Pharmaceutical Sciences, Chulalongkorn University, Bangkok,
Thailand
| | - Pasarapa Towiwat
- Center of Excellence in Natural Products for Ageing and Chronic Diseases,
Chulalongkorn University, Bangkok, Thailand
- Department of Pharmacology and Physiology, Faculty of Pharmaceutical
Sciences, Chulalongkorn University, Bangkok, Thailand
| | - Opa Vajragupta
- Center of Excellence in Natural Products for Ageing and Chronic Diseases,
Chulalongkorn University, Bangkok, Thailand
- Research Affairs, Faculty of Pharmaceutical Sciences, Chulalongkorn
University, Bangkok, Thailand
| | - Pornchai Rojsitthisak
- Center of Excellence in Natural Products for Ageing and Chronic Diseases,
Chulalongkorn University, Bangkok, Thailand
- Department of Food and Pharmaceutical Chemistry, Faculty of
Pharmaceutical Sciences, Chulalongkorn University, Bangkok,
Thailand
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A Stability-Indicating Ultra Performance Liquid Chromato-Graphic (UPLC) Method for the Determination of a Mycophenolic Acid-Curcumin Conjugate and Its Applications to Chemical Kinetic Studies. Molecules 2021; 26:molecules26175398. [PMID: 34500831 PMCID: PMC8433641 DOI: 10.3390/molecules26175398] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2021] [Revised: 08/30/2021] [Accepted: 08/31/2021] [Indexed: 11/16/2022] Open
Abstract
A simple, precise, and accurate reversed-phase ultra-performance liquid chromatographic (UPLC) method was developed and validated for the determination of a mycophenolic acid-curcumin (MPA-CUR) conjugate in buffer solutions. Chromatographic separation was performed on a C18 column (2.1 × 50 mm id, 1.7 µm) with a gradient elution system of water and acetonitrile, each containing 0.1% formic acid, at a flow rate of 0.6 mL/min. The column temperature was controlled at 33 °C. The compounds were detected simultaneously at the maximum wavelengths of mycophenolic acid (MPA), 254 nm, and curcumin (CUR), or MPA-CUR, at 420 nm. The developed method was validated according to the ICH Q2(R1) guidelines. The linear calibration curves of the assay ranged from 0.10 to 25 μg/mL (r2 ≥ 0.995, 1/x2 weighting factor), with a limit of detection and a limit of quantitation of 0.04 and 0.10 μg/mL, respectively. The accuracy and precision of the developed method were 98.4-101.6%, with %CV < 2.53%. The main impurities from the specificity test were found to be MPA and CUR. Other validation parameters, including robustness and solution stability, were acceptable under the validation criteria. Forced degradation studies were conducted under hydrolytic (acidic and alkaline), oxidative, thermal, and photolytic stress conditions. MPA-CUR was well separated from MPA, CUR, and other unknown degradation products. The validated method was successfully applied in chemical kinetic studies of MPA-CUR in different buffer solutions.
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Hamdy MMA, Abdel Moneim MM, Kamal MF. Accelerated stability study of the ester prodrug remdesivir: Recently FDA-approved Covid-19 antiviral using reversed-phase-HPLC with fluorimetric and diode array detection. Biomed Chromatogr 2021; 35:e5212. [PMID: 34227154 DOI: 10.1002/bmc.5212] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2021] [Revised: 06/23/2021] [Accepted: 07/01/2021] [Indexed: 12/21/2022]
Abstract
Remdesivir (RDV) is the first antiviral drug, approved by the Food and Drug Administration, to treat severe acute respiratory syndrome coronavirus 2. RDV is a relatively new chemical entity, 'ester prodrug', with no reported stability profile. Due to the urgency of its use and thus fast production, it is important to develop a stability-indicating method for its assay. Chromatographic separation was carried out on a C18 column (250 × 4.6 mm, 5 µm) with dual detection: diode array at 240 nm and fluorescence at λex/em 245/390 nm. Isocratic elution of acetonitrile and distilled water (acidified with phosphoric acid, pH 4) in the ratio of 55:45 (v/v), respectively, was used. The linearity range using HPLC-diode array detection was 0.1-15 μg/mL, whereas that using fluorimetric detection was 0.05-15 μg/mL. As per the International Conference on Harmonization guidelines, RDV has been degraded by accelerated alkaline, acidic, neutral hydrolysis, oxidative, heat, and photolytic stress conditions. Possible degradation hypothesis of the parent molecule has been suggested and illustrated. The proposed methods have achieved selective determination of the intact drug with no peaks overlapping in all assumptions. Extensive degradation confirms threatened drug stability at thermal and basic hydrolytic stressing. The developed methods were fully validated and proved suitable for quality control routine analysis of RDV in raw material and pharmaceutical dosage forms.
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Affiliation(s)
- Mohamed M A Hamdy
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Pharos University in Alexandria, Alexandria, Egypt
| | - Mona M Abdel Moneim
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Pharos University in Alexandria, Alexandria, Egypt
| | - Miranda F Kamal
- Department of Pharmaceutical Analytical Chemistry, Faculty of Pharmacy, Damanhour University, Beheira, Egypt
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8
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Mostafa MM, Abd El-Wahab ZH, Salman AA, Abdelbaset W. The use of complex formation manner for spectrophotometric analysis of gatifloxacin drug based on Co(II), Ni(II) and La(III) ions. Heliyon 2021; 7:e06051. [PMID: 33537484 PMCID: PMC7841363 DOI: 10.1016/j.heliyon.2021.e06051] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2020] [Revised: 10/20/2020] [Accepted: 01/18/2021] [Indexed: 01/11/2023] Open
Abstract
Herein, a simple and accurate spectrophotometric method was developed to detect gatifloxacin (HGAT) in a pure and ophthalmic formulation. The method depends on complexation of HGAT with Co (II), Ni (II) and La(III) ions in ethanol medium at room temperature. The experimental conditions have been investigated to reach optimum conditions for HGAT-metal ions interaction, including detection of a suitable wavelength, medium pH, reaction time and reactants concentration. Moreover, the composition of these complexes in addition to their stability constants were also investigated and the result indicated that the molar ratio of HGAT: Metal ion is 1:1 for Ni (II) and La(III) ions and 1:2 for Co (II) ion. Beer's law plots were obeyed in the concentration ranges 18.77-150.16, 18.77-131.39 and 18.77-112.62 (μg mL-1) for Co(II), Ni(II) and La(III) ions interaction, respectively. The apparent molar absorptivity, Sandell's sensitivity, standard deviation, detection and quantification limits were calculated. The proposed method was successfully applied for the determination of HGAT in the bulk and ophthalmic formulation. The obtained results were compared statistically with other published methods and the results were in good agreement with those obtained by reported methods.
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Affiliation(s)
- Mona M. Mostafa
- National Organization for Drug Control & Research (NODCAR), Agouza, Dokki, Cairo, Egypt
| | - Zeinab H. Abd El-Wahab
- Chemistry Department, Faculty of Science (Girl's), Al-Azhar University, Youssif Abbas St., Nasr-City, P.O. Box 11754, Cairo, Egypt
| | - Aida A. Salman
- Chemistry Department, Faculty of Science (Girl's), Al-Azhar University, Youssif Abbas St., Nasr-City, P.O. Box 11754, Cairo, Egypt
| | - W.M. Abdelbaset
- National Organization for Drug Control & Research (NODCAR), Agouza, Dokki, Cairo, Egypt
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Sorasitthiyanukarn FN, Muangnoi C, Rojsitthisak P, Rojsitthisak P. Chitosan-alginate nanoparticles as effective oral carriers to improve the stability, bioavailability, and cytotoxicity of curcumin diethyl disuccinate. Carbohydr Polym 2020; 256:117426. [PMID: 33483016 DOI: 10.1016/j.carbpol.2020.117426] [Citation(s) in RCA: 41] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2020] [Revised: 10/08/2020] [Accepted: 11/17/2020] [Indexed: 02/08/2023]
Abstract
Curcumin diethyl disuccinate (CDD) is an ester prodrug of curcumin that has better chemical stability in phosphate buffer (pH 7.4) and anticancer activities against MDA-MB-231 human breast cancer cells and Caco-2 cells than curcumin. However, a major drawback of CDD is its poor water solubility and low bioavailability in the gastrointestinal tract. To overcome these problems, a nanoformulation was developed using chitosan/alginate nanoparticles (CANPs) under the optimal condition as previously derived by statistical optimization. The CDD-loaded CANPs (CDD-CANPs) were found to exhibit good stability after exposure to simulated digestive fluids and ultraviolet light, and a sustained-release profile of CDD in the simulated digestive and body fluids. The in vitro release pattern fitted well to the Peppas-Sahlin model, indicating that the release of CDD was mainly governed by diffusion. Compared to free CDD, the CDD-CANPs showed better stability, bioaccessibility, bioavailability, cellular uptake, and cytotoxicity against HepG2 cells.
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Affiliation(s)
- Feuangthit Niyamissara Sorasitthiyanukarn
- Metallurgy and Materials Science Research Institute, Chulalongkorn University, Bangkok 10330, Thailand; Natural Products for Ageing and Chronic Diseases Research Unit, Faculty of Pharmaceutical Sciences, Chulalongkorn University, Bangkok 10330, Thailand.
| | - Chawanphat Muangnoi
- Natural Products for Ageing and Chronic Diseases Research Unit, Faculty of Pharmaceutical Sciences, Chulalongkorn University, Bangkok 10330, Thailand; Institute of Nutrition, Mahidol University, Nakhon Pathom 73170, Thailand.
| | - Pornchai Rojsitthisak
- Natural Products for Ageing and Chronic Diseases Research Unit, Faculty of Pharmaceutical Sciences, Chulalongkorn University, Bangkok 10330, Thailand; Department of Food and Pharmaceutical Chemistry, Faculty of Pharmaceutical Sciences, Chulalongkorn University, Bangkok 10330, Thailand.
| | - Pranee Rojsitthisak
- Metallurgy and Materials Science Research Institute, Chulalongkorn University, Bangkok 10330, Thailand; Natural Products for Ageing and Chronic Diseases Research Unit, Faculty of Pharmaceutical Sciences, Chulalongkorn University, Bangkok 10330, Thailand.
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