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Jesionek P, Hachuła B, Jurkiewicz K, Włodarczyk P, Hreczka M, Kamiński K, Kamińska E. Variation of Activation Volume as an Indicator of the Difference in Clusterization Phenomenon Induced by H-Bonding and F-Π Stacking Interactions in Enantiomers and a Racemate of Flurbiprofen. J Phys Chem B 2024; 128:4021-4032. [PMID: 38608273 PMCID: PMC11056992 DOI: 10.1021/acs.jpcb.4c00582] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2024] [Revised: 03/23/2024] [Accepted: 03/29/2024] [Indexed: 04/14/2024]
Abstract
In this paper, X-ray diffraction (XRD), differential scanning calorimetry (DSC), broadband dielectric (BDS), and Fourier transform infrared (FTIR) spectroscopy supported by molecular dynamics (MD) simulations and quantum chemical computations were applied to investigate the structural and thermal properties, molecular dynamics, and H-bonding pattern of R-, S-, and RS-flurbiprofen (FLP). Experimental data indicated various spatial molecular arrangements in crystalline forms of examined systems, which seemed to disappear in the liquid state. Surprisingly, deeper analysis of high-pressure dielectric data revealed unexpected variation in the activation volume of pure enantiomers and a racemate. MD simulations showed that it is an effect of the clusterization phenomenon and a higher population of small associates in the former samples. Moreover, theoretical consideration exposed the particular role of unspecific F-Π interactions as a driving force underlying local molecular arrangements of molecules in the liquid and the crystal lattice of R-, S-, and RS-FLP.
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Affiliation(s)
- Paulina Jesionek
- Institute
of Chemistry, Faculty of Science and Technology, University of Silesia in Katowice, Szkolna 9, 40-007 Katowice, Poland
- Department
of Pharmacognosy and Phytochemistry, Faculty of Pharmaceutical Sciences
in Sosnowiec, Medical University of Silesia
in Katowice, Jagiellonska 4, 41-200 Sosnowiec, Poland
| | - Barbara Hachuła
- Institute
of Chemistry, Faculty of Science and Technology, University of Silesia in Katowice, Szkolna 9, 40-007 Katowice, Poland
| | - Karolina Jurkiewicz
- Institute
of Physics, Faculty of Science and Technology, University of Silesia in Katowice, 75 Pulku Piechoty 1, 41-500 Chorzow, Poland
| | - Patryk Włodarczyk
- Łukasiewicz
Research Network - Institute of Non-Ferrous Metals, Sowinskiego 5 St., 44-100, Gliwice, Poland
| | - Marek Hreczka
- Łukasiewicz
Research Network - Institute of Non-Ferrous Metals, Sowinskiego 5 St., 44-100, Gliwice, Poland
- Department
of Mechatronics, Silesian University of
Technology, Akademicka
10A St., 44-100 Gliwice, Poland
| | - Kamil Kamiński
- Institute
of Physics, Faculty of Science and Technology, University of Silesia in Katowice, 75 Pulku Piechoty 1, 41-500 Chorzow, Poland
| | - Ewa Kamińska
- Department
of Pharmacognosy and Phytochemistry, Faculty of Pharmaceutical Sciences
in Sosnowiec, Medical University of Silesia
in Katowice, Jagiellonska 4, 41-200 Sosnowiec, Poland
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Mittal G, Jakhar P, Patel A, Bhagwat DP. Pharmacokinetic assessment of cefpodoxime proxetil in diabetic rats. J Diabetes Metab Disord 2023; 22:385-392. [PMID: 37255782 PMCID: PMC10225406 DOI: 10.1007/s40200-022-01156-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/14/2021] [Accepted: 10/30/2022] [Indexed: 06/01/2023]
Abstract
Purpose In diabetes, multi-organ level dysfunction arising from metabolic complications is reported to influence the pharmacokinetics (PK) profile of many drugs. Hence, the present study was planned in rats to evaluate the effect of diabetes on the PK profile of cefpodoxime, a widely prescribed oral antibiotic. Method PK profile of cefpodoxime was assessed after oral administration of cefpodoxime proxetil (10 and 20 mg/kg) and intravenous (i.v) administration of cefpodoxime sodium (10 mg/kg) in normal and streptozotocin induced diabetic rats. To evaluate the impact of diabetes on oral absorption and serum protein binding, in situ intestinal permeability and in vitro serum protein binding studies were performed for cefpodoxime using Single Pass Intestinal Perfusion model (SPIP) and ultracentrifugation technique, respectively. Result In diabetic rats, there was significant (p < 0.01) decrease in maximum concentration (Cmax) and area under the curve (AUC) of cefpodoxime by both oral and intravenous route, which was attributed to augmented clearance of cefpodoxime. There was no change in the time to achieve Cmax (Tmax) suggesting no alteration in oral absorption which was further confirmed through unaltered intestinal permeability in diabetic rats. The protein binding in diabetic rats also remained unchanged, indicating no influence of protein binding on elevated clearance. Conclusion The plasma exposure of cefpodoxime, a renally eliminated drug was significantly lowered in diabetic rats due to enhanced glomerular filtration. However, this observation needs to be confirmed through well controlled clinical trials.
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Affiliation(s)
- Garima Mittal
- Department of Pharmacy, Panipat Institute of Engineering and Technology, Panipat, Haryana India
| | - Priyanka Jakhar
- Amar Shaheed Baba Ajit Singh Jujhar Singh Memorial College of Pharmacy, Ropar, Punjab India
| | - Anasuya Patel
- Wockhardt Research Centre, Chikalthana, Aurangabad, Maharashtra India
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Zheng D, Ruan YT, Yin ZP, Zhang QF. A Comparison of Solubility, Stability, and Bioavailability between Astilbin and Neoastilbin Isolated from Smilax glabra Rhizoma. Molecules 2020; 25:molecules25204728. [PMID: 33076319 PMCID: PMC7587598 DOI: 10.3390/molecules25204728] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2020] [Revised: 10/05/2020] [Accepted: 10/12/2020] [Indexed: 12/21/2022] Open
Abstract
Astilbin and neoastilbin are two flavonoid stereoisomers. In the present study, their solubility, stability, and bioavailability were compared in a rat. The results revealed that the water solubility of astilbin and neoastilbin was 132.72 μg/mL and 217.16 μg/mL, respectively. The oil–water distribution coefficient (log P) of astilbin and neoastilbin in simulated gastric fluid (SGF) was 1.57 and 1.39, and in simulated intestinal fluid (SIF) was 1.09 and 0.98, respectively. In SIF, about 78.6% astilbin remained after 4 h of incubation at 37 °C, while this value was 88.3% for neoastilbin. Most of the degraded astilbin and neoastilbin were isomerized into their cis-trans-isomer, namely neoisoastilbin and isoastilbin, respectively, and the decomposed parts were rare. For bioavailability comparison in a rat, an HPLC method for trace amounts of astilbin and neoastilbin determination in plasma was developed, and the pretreatment of plasma was optimized. A pharmacokinetic study showed that the absolute bioavailability of astilbin and neoastilbin in a rat showed no significant difference with values of 0.30% and 0.28%, respectively.
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Pieper M, Schleich H, Gröger H. Isolation and characterization of side-products formed through ∆2-isomerization in the synthesis of cefpodoxime proxetil. J Antibiot (Tokyo) 2019; 72:702-708. [PMID: 31217553 DOI: 10.1038/s41429-019-0190-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2018] [Revised: 03/05/2019] [Accepted: 03/12/2019] [Indexed: 11/08/2022]
Abstract
In the synthesis of cephalosporin antibiotics, esterified in 4-position, the ∆2-isomerization is a well-known side reaction proceeding under basic conditions. In this work, we investigated the ∆2-isomerization of the esterified cefpodoxime proxetil. Due to the R-configuration and S-configuration of the stereogenic center in the side chain in 4-position, there are two starting materials being diastereomeric to each other. Furthermore, an additional stereogenic center is formed in the isomerization step, thus leading to four possible products. To the best of our knowledge, in this work for the first time the ∆2-isomerization of the two isolated diastereomers of AMCA proxetil, a precursor of cefpodoxime proxetil, as a starting material is reported. It has been shown, that each diastereomer only reacts to one of the two possible ∆2-diastereomers. The synthesis, isolation and characterization of (R)-diastereomers as well as (S)-diastereomers of ∆2-AMCA proxetil and cefpodoxime proxetil, respectively, are presented.
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Affiliation(s)
- Matthias Pieper
- Chair of Industrial Organic Chemistry and Biotechnology, Faculty of Chemistry, Bielefeld University, Universitätsstr. 25, 33615, Bielefeld, Germany
| | - Herbert Schleich
- Sandoz GmbH, Business Unit Anti-Infectives, Biochemiestrasse 10, 6250, Kundl, Austria
| | - Harald Gröger
- Chair of Industrial Organic Chemistry and Biotechnology, Faculty of Chemistry, Bielefeld University, Universitätsstr. 25, 33615, Bielefeld, Germany.
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Heydari R, Shamsipur M. Enantiomeric Separation and Quantitation of Tenofovir Disoproxil Fumarate Using Amylose-Based Chiral Stationary Phases by High-Performance Liquid Chromatography. ACTA CHROMATOGR 2015. [DOI: 10.1556/achrom.27.2015.4.1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Teitelbaum AM, Meissner A, Harding RA, Wong CA, Aldrich CC, Remmel RP. Synthesis, pH-dependent, and plasma stability of meropenem prodrugs for potential use against drug-resistant tuberculosis. Bioorg Med Chem 2013; 21:5605-17. [PMID: 23845282 PMCID: PMC3740032 DOI: 10.1016/j.bmc.2013.05.024] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2013] [Revised: 05/04/2013] [Accepted: 05/15/2013] [Indexed: 10/26/2022]
Abstract
Meropenem, a broad-spectrum parenteral β-lactam antibiotic, in combination with clavulanate has recently shown efficacy in patients with extensively drug-resistant tuberculosis. As a result of meropenem's short half-life and lack of oral bioavailability, the development of an oral therapy is warranted for TB treatment in underserved countries where chronic parenteral therapy is impractical. To improve the oral absorption of meropenem, several alkyloxycarbonyloxyalkyl ester prodrugs with increased lipophilicity were synthesized and their stability in physiological aqueous solutions and guinea pig as well as human plasma was evaluated. The stability of prodrugs in aqueous solution at pH 6.0 and 7.4 was significantly dependent on the ester promoiety with the major degradation product identified as the parent compound meropenem. However, in simulated gastrointestinal fluid (pH 1.2) the major degradation product identified was ring-opened meropenem with the promoiety still intact, suggesting the gastrointestinal environment may reduce the absorption of meropenem prodrugs in vivo unless administered as an enteric-coated formulation. Additionally, the stability of the most aqueous stable prodrugs in guinea pig or human plasma was short, implying a rapid release of parent meropenem.
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Affiliation(s)
- Aaron M. Teitelbaum
- Department of Medicinal Chemistry, University of Minnesota, Minneapolis, Minnesota 55455
| | - Anja Meissner
- Department of Medicinal Chemistry, University of Minnesota, Minneapolis, Minnesota 55455
- Center for Drug Design, University of Minnesota, Minneapolis, Minnesota, MN 55455
| | - Ryan A. Harding
- Department of Medicinal Chemistry, University of Minnesota, Minneapolis, Minnesota 55455
| | - Christopher A. Wong
- Center for Drug Design, University of Minnesota, Minneapolis, Minnesota, MN 55455
| | - Courtney C. Aldrich
- Center for Drug Design, University of Minnesota, Minneapolis, Minnesota, MN 55455
| | - Rory P. Remmel
- Department of Medicinal Chemistry, University of Minnesota, Minneapolis, Minnesota 55455
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Abstract
The present work describes the development of a sensitive and economic stability indicating high performance liquid chromatographic (HPLC) method for the determination of cefpodoxime proxetil (CP) as bulk drug and as pharmaceutical formulation. Both R and S isomers of the drug were separated using Phenomenex ( mm, 5 μm particle size) ODS column with a flow rate of 1 mL min−1 and an SPD 20 A UV detector to monitor the eluate at 252 nm. The isocratic method used a mobile phase consisting of methanol and phosphate buffer of pH 4.0 in the ratio 65 : 35. The linear regression analysis data for the calibration plots showed good linear relationship with in the working concentration range of 5–100 μg mL−1. The LOD and LOQ were 53 and 160 ng mL−1, respectively. CP was subjected to stress degradation using acid, alkali, hydrogen peroxide, dry heat, wet heat, and UV light. The standard drug peaks were well resolved from the degradation products’ peaks with significantly different retention time (Rt), and the resolution factor for the R and S isomers of CP was found to be greater than 2.
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Patel G, Rajput S. Stress degradation studies on cefpodoxime proxetil and development of a validated stability-indicating HPLC method. ACTA CHROMATOGR 2011. [DOI: 10.1556/achrom.23.2011.2.3] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Khan F, Katara R, Ramteke S. Enhancement of bioavailability of cefpodoxime proxetil using different polymeric microparticles. AAPS PharmSciTech 2010; 11:1368-75. [PMID: 20821175 PMCID: PMC2974107 DOI: 10.1208/s12249-010-9505-x] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2009] [Accepted: 06/30/2010] [Indexed: 11/30/2022] Open
Abstract
Poorly water-soluble drugs such as cefpodoxime proxetil (400 μg/ml) offer a challenging problem in drug formulation as poor solubility is generally associated with poor dissolution characteristics and thus poor oral bioavailability. According to these characteristics, preparation of cefpodoxime proxetil microparticle has been achieved using high-speed homogenization. Polymers (methylcellulose, sodium alginate, and chitosan) were precipitated on the surface of cefpodoxime proxetil using sodium citrate and calcium chloride as salting-out agents. The pure drug and the prepared microparticles with different concentrations of polymer (0.05-1.0%) were characterized in terms of solubility, drug content, particle size, thermal behavior (differential scanning calorimeter), surface morphology (scanning electron microscopy), in vitro drug release, and stability studies. The in vivo performance was assessed by pharmacokinetic study. The dissolution studies demonstrate a marked increase in the dissolution rate in comparison with pure drug. The considerable improvement in the dissolution rate of cefpodoxime proxetil from optimized microparticle was attributed to the wetting effect of polymers, altered surface morphology, and micronization of drug particles. The optimized microparticles exhibited excellent stability on storage at accelerated condition. The in vivo studies revealed that the optimized formulations provided improved pharmacokinetic parameter in rats as compared with pure drug. The particle size of drug was drastically reduced during formulation process of microparticles.
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Affiliation(s)
- Fahim Khan
- School of Pharmaceutical Sciences, Rajive Gandhi Technical University, Airport Bypass Road, Gandhi Nagar, Bhopal, Madhya Pradesh 462036 India
| | - Rajesh Katara
- School of Pharmaceutical Sciences, Rajive Gandhi Technical University, Airport Bypass Road, Gandhi Nagar, Bhopal, Madhya Pradesh 462036 India
| | - Suman Ramteke
- School of Pharmaceutical Sciences, Rajive Gandhi Technical University, Airport Bypass Road, Gandhi Nagar, Bhopal, Madhya Pradesh 462036 India
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