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Pradhan BL, Lodhi L, Dey KK, Ghosh M. Analyzing atomic scale structural details and nuclear spin dynamics of four macrolide antibiotics: erythromycin, clarithromycin, azithromycin, and roxithromycin. RSC Adv 2024; 14:17733-17770. [PMID: 38832242 PMCID: PMC11145140 DOI: 10.1039/d4ra00718b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2024] [Accepted: 05/26/2024] [Indexed: 06/05/2024] Open
Abstract
The current investigation centers on elucidating the intricate molecular architecture and dynamic behavior of four macrolide antibiotics, specifically erythromycin, clarithromycin, azithromycin, and roxithromycin, through the application of sophisticated solid-state nuclear magnetic resonance (SSNMR) methodologies. We have measured the principal components of chemical shift anisotropy (CSA) parameters, and the site-specific spin-lattice relaxation time at carbon nuclei sites. To extract the principal components of CSA parameters, we have employed 13C 2DPASS CP-MAS SSNMR experiments at two different values of magic angle spinning (MAS) frequencies, namely 2 kHz and 600 Hz. Additionally, the spatial correlation between 13C and 1H nuclei has been investigated using 1H-13C frequency switched Lee-Goldburg heteronuclear correlation (FSLGHETCOR) experiment at a MAS frequency of 24 kHz. Our findings demonstrate that the incorporation of diverse functional groups, such as the ketone group and oxime group with the lactone ring, exerts notable influences on the structure and dynamics of the macrolide antibiotic. In particular, we have observed a significant decrease in the spin-lattice relaxation time of carbon nuclei residing on the lactone ring, desosamine, and cladinose in roxithromycin, compared to erythromycin. Overall, our findings provide detailed insight into the relationship between the structure and dynamics of macrolide antibiotics, which is eventually correlated with their biological activity. This knowledge can be utilized to develop new and more effective drugs by providing a rational basis for drug discovery and design.
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Affiliation(s)
- Bijay Laxmi Pradhan
- Physics Section, Mahila Maha Vidyalaya, Banaras Hindu University Varanasi-221005 Uttar-Pradesh India
- Department of Physics, Institute of Science, Banaras Hindu University Varanasi-221005 Uttar-Pradesh India
| | - Lekhan Lodhi
- Department of Zoology, Dr Harisingh Gour Central University Sagar-470003 Madhya-Pradesh India
| | - Krishna Kishor Dey
- Department of Physics, Dr Harisingh Gour Central University Sagar-470003 Madhya-Pradesh India
| | - Manasi Ghosh
- Physics Section, Mahila Maha Vidyalaya, Banaras Hindu University Varanasi-221005 Uttar-Pradesh India
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Abdallah FF, Fatma M, Gouda AM, Abdelaleem EA, Emam AA. Ecofriendly HPLC Method for Simultaneous Determination of the Co-Prescribed Drugs in Chemotherapy Omeprazole, Ondansetron and Deflazacort in Spiked Human Plasma. J Chromatogr Sci 2023:bmad088. [PMID: 37997391 DOI: 10.1093/chromsci/bmad088] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2023] [Revised: 10/11/2023] [Accepted: 11/04/2023] [Indexed: 11/25/2023]
Abstract
Green, selective and accurate high-performance liquid chromatography (HPLC) chromatographic method is presented for simultaneous separation and quantitation of the co-prescribed drugs in chemotherapy omeprazole, ondansetron and deflazacort in spiked human plasma. An isocratic HPLC separation was performed on X Bridge C18 (4.6 × 250 mm) column with 5 μm particle size using mobile phase consisting of methanol: ammonium acetate buffer pH 4 adjusted by acetic acid (60: 40, v/v). The injection volume was 20μL with UV detection wavelength at 237 nm at room temperature. Flow rate of the mobile phase was adjusted to be 2.0 ml/min. Dexamethasone was used as internal standard to correct the variation during sample pretreatment. FDA guidelines were followed to validate the developed method. Successful application of the developed method was revealed by simultaneous determination of omeprazole, ondansetron and deflazacort in spiked human plasma in ranges of 1-20, 0.1-8 and 0.2-8 μg mL-1 for omeprazole, ondansetron and deflazacort, respectively. Four greenness assessment tools were used to evaluate the greenness of the developed method and the results were accepted. This method permitted the accurate simultaneous determination of the studied drugs, thus it can be used during therapeutic drug monitoring in daily clinical practice.
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Affiliation(s)
- Fatma F Abdallah
- Pharmaceutical Analytical Chemistry Department, Faculty of Pharmacy, Beni-Suef University, Alshaheed Shehata Ahmad Hegazy St., Beni-Suef 62514, Egypt
| | - M Fatma
- Medicinal Chemistry Department, Faculty of Pharmacy, Beni-Suef University, Alshaheed Shehata Ahmad Hegazy St., Beni-Suef 62514, Egypt
| | - Ahmed M Gouda
- Medicinal Chemistry Department, Faculty of Pharmacy, Beni-Suef University, Alshaheed Shehata Ahmad Hegazy St., Beni-Suef 62514, Egypt
| | - Eglal A Abdelaleem
- Pharmaceutical Analytical Chemistry Department, Faculty of Pharmacy, Beni-Suef University, Alshaheed Shehata Ahmad Hegazy St., Beni-Suef 62514, Egypt
| | - Aml A Emam
- Pharmaceutical Analytical Chemistry Department, Faculty of Pharmacy, Beni-Suef University, Alshaheed Shehata Ahmad Hegazy St., Beni-Suef 62514, Egypt
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Pradhan B, Yadav JP, Lodhi L, Sen P, Dey KK, Ghosh M. Atomic-Scale Resolution Insights into Structural and Dynamic Differences between Ofloxacin and Levofloxacin. ACS OMEGA 2023; 8:24093-24105. [PMID: 37426250 PMCID: PMC10323956 DOI: 10.1021/acsomega.3c03406] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/16/2023] [Accepted: 06/09/2023] [Indexed: 07/11/2023]
Abstract
This study employs advanced solid-state NMR techniques to investigate the atomic-level structure and dynamics of two enantiomers: ofloxacin and levofloxacin. The investigation focuses on critical attributes, such as the principal components of the chemical shift anisotropy (CSA) tensor, the spatial proximity of 1H and 13C nuclei, and site-specific 13C spin-lattice relaxation time, to reveal the local electronic environment surrounding specific nuclei. Levofloxacin, the levo-isomer of ofloxacin, exhibits higher antibiotic efficacy than its counterpart, and the dissimilarities in the CSA parameters indicate significant differences in the local electronic configuration and nuclear spin dynamics between the two enantiomers. Additionally, the study employs the 1H-13C frequency-switched Lee-Goldburg heteronuclear correlation (FSLGHETCOR) experiment to identify the presence of heteronuclear correlations between specific nuclei (C15 and H7 nuclei and C13 and H12 nuclei) in ofloxacin but not in levofloxacin. These observations offer insights into the link between bioavailability and nuclear spin dynamics, underscoring the significance of NMR crystallography approaches in advanced drug design.
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Affiliation(s)
- Bijay
Laxmi Pradhan
- Department
of Physics, Institute of Science, Banaras
Hindu University, Varanasi 221005, Uttar-Pradesh, India
- Physics
Section, Mahila Maha Vidyalaya, Banaras
Hindu University, Varanasi 221005, Uttar-Pradesh, India
| | - Jai Prakash Yadav
- Physics
Section, Mahila Maha Vidyalaya, Banaras
Hindu University, Varanasi 221005, Uttar-Pradesh, India
| | - Lekhan Lodhi
- Department
of Zoology, Dr. Harisingh Gour Central University, Sagar 470003, Madhya-Pradesh, India
| | - Prince Sen
- Department
of Physics, Dr. Harisingh Gour Central University, Sagar 470003, Madhya-Pradesh, India
| | - Krishna Kishor Dey
- Department
of Physics, Dr. Harisingh Gour Central University, Sagar 470003, Madhya-Pradesh, India
| | - Manasi Ghosh
- Physics
Section, Mahila Maha Vidyalaya, Banaras
Hindu University, Varanasi 221005, Uttar-Pradesh, India
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Yadav JP, Lodhi L, Fatma T, Dey KK, Ghosh M. Investigation of the Influence of Various Functional Groups on the Dynamics of Glucocorticoids. ACS OMEGA 2022; 7:43190-43209. [PMID: 36467925 PMCID: PMC9713872 DOI: 10.1021/acsomega.2c05892] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/11/2022] [Accepted: 11/02/2022] [Indexed: 06/17/2023]
Abstract
The basic configuration of glucocorticoid consists of four-fused rings associated with one cyclohexadienone ring, two cyclohexane rings, and one cyclopentane ring. The ways the structure and dynamics of five glucocorticoids (prednisone, prednisolone, prednisolone acetate, methylprednisolone, and methylprednisolone acetate) are altered because of the substitution of various functional groups with these four-fused rings are studied thoroughly by applying sophisticated solid-state nuclear magnetic resonance (NMR) methodologies. The biological activities of these glucocorticoids are also changed because of the attachment of various functional groups with these four-fused rings. The substitution of the hydroxyl group (with the C11 atom of the cyclohexane ring) in place of the keto group enhances the potential of the glucocorticoid to cross the cellular membrane. As a result, the bioavailability of prednisolone (the hydroxyl group is attached with the C11 atom of the cyclohexane ring) is increased compared to prednisone (the keto group is attached with the C11 atom of cyclohexane rings). Another notable point is that the spin-lattice relaxation rate at crystallographically distinct carbon nuclei sites of prednisolone is increased compared to that of the prednisone, which implies that the motional degrees of freedom of glucocorticoid is increased because of the substitution of the hydroxyl group in place of the keto group of the cyclohexane ring. The attachment of the methyl group with the C6 atom of cyclohexane rings further reduces the spin-lattice relaxation time at crystallographically distinct carbon nuclei sites of glucocorticoid and its bioactivity is also increased. By comparing the spin-lattice relaxation time and the local correlation time at crystallographically different carbon nuclei sites of three steroids prednisone, prednisolone, and methylprednisolone, it is observed that both the spin-lattice relaxation time and the local correlation time gradually decrease at each crystallographically distinct carbon nuclei sites when we move from prednisone to prednisolone to methyl-prednisolone. On the other hand, if we compare the same for prednisolone, prednisolone acetate, and methylprednisolone acetate, then we also observe that both the spin-lattice relaxation time and the local-correlation time gradually decrease from prednisolone to prednisolone acetate to methylprednisolone acetate for all chemically different carbon nuclei. It is also noticeable that both the spin-lattice relaxation time and the local-correlation time gradually decrease from prednisone to prednisolone to prednisolone acetate to methylprednisolone to methylprednisolone acetate for most of the carbon nuclei sites. From in silico analysis, it is also revealed that the bioavailability and efficacy of the glucocorticoid increase from prednisone to prednisolone to prednisolone acetate to methylprednisolone to methylprednisolone acetate. Hence, it can be concluded that the biological activity and the motional degrees of freedom of the glucocorticoids are highly correlated. These types of studies provide a clear picture of the structure-activity relationship of the drug molecules, which will enlighten the path of developing highly potent glucocorticoids with minimum side effects. Another important aspect of these types of studies is to provide information about the electronics configuration and nuclear spin dynamics at crystallographically different carbon nuclei sites of five glucocorticoids, which will enrich the field of "NMR crystallography".
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Affiliation(s)
- Jai Prakash Yadav
- Physics
Section, Mahila Maha Vidyalaya, Banaras
Hindu University, Varanasi, Uttar Pradesh221005, India
| | - Lekhan Lodhi
- Department
of Zoology, Dr. Harisingh Gour Central University, Sagar, Madhya Pradesh470003, India
| | - Tamseel Fatma
- Department
of Bioinformatics, Mahila Maha Vidyalaya, Banaras Hindu University, Varanasi, Uttar Pradesh221005, India
| | - Krishna Kishor Dey
- Department
of Physics, Dr. Harisingh Gour Central University, Sagar, Madhya Pradesh470003, India
| | - Manasi Ghosh
- Physics
Section, Mahila Maha Vidyalaya, Banaras
Hindu University, Varanasi, Uttar Pradesh221005, India
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Dey KK, Deshmukh MM, Ghosh M. A Description of the Local Structure and Dynamics of Ketoconazole Molecule by Solid‐State NMR Measurements and DFT Calculations: Proposition for NMR Crystallography. ChemistrySelect 2021. [DOI: 10.1002/slct.202102622] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Krishna Kishor Dey
- Department of Physics Dr. Harisingh Gour Central University Sagar 470003, Madhya-Pradesh India
| | - Milind M. Deshmukh
- Department of Chemistry Dr. Harisingh Gour Central University Sagar 470003, Madhya-Pradesh India
| | - Manasi Ghosh
- Physics Section MMV Banaras Hindu University Varanasi 221005, Uttar-Pradesh India
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Dey KK, Ghosh M. Study of the structure and dynamics at various parts of the antibacterial drug molecule cefpodoxime proxetil. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2021; 115:101752. [PMID: 34340119 DOI: 10.1016/j.ssnmr.2021.101752] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/25/2021] [Revised: 07/26/2021] [Accepted: 07/26/2021] [Indexed: 06/13/2023]
Abstract
The structure and dynamics of cefpodoxime proxetil are elucidated by measuring chemical shift anisotropy (CSA) tensor, spin-lattice relaxation time, and local correlation time at twenty-one crystallographically different 13C nuclei sites. The principal components of CSA tensor of cefpodoxime proxetil are extracted by the two-dimensional phase adjusted sinning sideband (2DPASS) cross-polarization magic angle spinning (CP-MAS) solid-state NMR experiment, and the spin-lattice relaxation time is measured by the method outlined by Torchia(T1CP). The local correlation time is calculated by bearing in mind that the spin-lattice relaxation mechanism of 13C nuclei is mainly governed by the CSA interaction and the heteronuclear dipole-dipole interaction. The aminothiazole ring, β-lactam ring, and dihydrothiazine ring provide stability to the drug molecule and increase the affinity of the drug to penicillin-binding proteins (PBPs) receptors. The principal components of CSA parameters, spin-lattice relaxation time, and local correlation time vary substantially for carbon nuclei residing on these three rings. These signify that not only the electronic environment, but the molecular conformation, and the local dynamics are also altered within the ring. The substitution of the acyl side chain, oxime group, and the aminothiazole ring at the C7 position of the β-lactam ring enhances the antibacterial activity and the binding affinity of the drug. A huge variation of the spin-lattice relaxation time and local correlation time is observed in those regions. The change in the electron charge distribution and nuclear spin dynamics at different parts of the drug molecule is clear by CSA and spin-lattice relaxation measurements, which will enrich the field "NMR crystallography".
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Affiliation(s)
- Krishna Kishor Dey
- Department of Physics, Dr. Harisingh Gour Central University, Sagar, 470003, Madhya-Pradesh, India
| | - Manasi Ghosh
- Physics Section, MMV, Banaras Hindu University, Varanasi, 221005, Uttar-Pradesh, India.
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Dey K, Lodhi L, Ghosh M. Study of the Variation of the Electronic Distribution and Motional Dynamics of Two Independent Molecules of an Asymmetric Unit of Atorvastatin Calcium by Solid-State NMR Measurements. ACS OMEGA 2021; 6:22752-22764. [PMID: 34514246 PMCID: PMC8427786 DOI: 10.1021/acsomega.1c03095] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/12/2021] [Accepted: 08/16/2021] [Indexed: 06/13/2023]
Abstract
Significant changes in the spin-lattice time and chemical shift anisotropy (CSA) parameters are observed in two independent molecules of an asymmetric unit of atorvastatin calcium (ATC-I) (which is referred to as "a"- and "b"-type molecules by following Wang et al.). The longitudinal magnetization decay curve is fitted by two exponentials-one with longer relaxation time and another with shorter relaxation time for most of the carbon nuclei sites. The local correlation time also varies significantly. This is the experimental evidence of the coexistence of two different kinds of motional degrees of freedom within ATC-I molecule. The solubility and bioavailability of the drug molecule are enhanced due to the existence of two different kinds of dynamics. Hence, the macroscopic properties like solubility and bioavailability of a drug molecule are highly correlated with its microscopic properties. The motional degrees of freedom of "a"- and "b"-type molecules are also varied remarkably at certain carbon nuclei sites. This is the first time the change in the molecular dynamics of two independent molecules of an asymmetric unit of atorvastatin calcium is quantified using solid-state NMR methodology. These types of studies, in which the chemical shift anisotropy (CSA) parameters and spin-lattice relaxation time provide information about the change in electronic distribution and the spin dynamics at the various crystallographic location of the drug molecule, will enrich the field "NMR crystallography". It will also help us to understand the electronic distribution around a nucleus and the nuclear spin dynamics at various parts of the molecule, which is essential to develop the strategies for the administration of the drug.
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Affiliation(s)
- Krishna
Kishor Dey
- Department
of Physics, Dr. Harisingh Gour Central University, Sagar 470003, Madhya Pradesh, India
| | - Lekhan Lodhi
- Department
of Zoology, Dr. Harisingh Gour Central University, Sagar 470003, Madhya Pradesh, India
| | - Manasi Ghosh
- Physics
Section, Mahila Maha Vidyalaya, Banaras
Hindu University, Varanasi 221005, Uttar Pradesh, India
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Dey KK, Gayen S, Ghosh M. Structure and dynamics of sodium alginate as elucidated by chemical shift anisotropy and site-specific spin-lattice relaxation time measurements. EUROPEAN BIOPHYSICS JOURNAL: EBJ 2021; 50:963-977. [PMID: 34254174 DOI: 10.1007/s00249-021-01559-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/01/2020] [Revised: 03/31/2021] [Accepted: 06/26/2021] [Indexed: 11/29/2022]
Abstract
The biocompatible, biodegradable, linear copolymer sodium alginate is fabricated from [Formula: see text] linked [Formula: see text]-D-mannuronic acid (M block) and [Formula: see text]-L-guluronic acid (G-block). It has wide applications in drug delivery, cell encapsulation, and commercial application in the textile, cosmetics, paper, food, biomedical, and pharmaceutical industries. The structure and dynamics of sodium alginate were here investigated by measuring chemical shift anisotropy (CSA) parameters, spin-lattice relaxation time, and molecular correlation time. The principal components of the CSA tensor were determined by two-dimensional phase-adjusted spinning sideband (2DPASS) cross-polarization magic angle spinning (CP-MAS) SSNMR. The alternating M and G blocks of both equatorial and axial links are associated with greater overall flexibility. The molecular correlation time of the carboxyl carbon of both G and M blocks is faster than for the anomeric carbon and pyranose carbon. This is further experimental evidence of the coexistence of two different dynamics within the polysaccharide chains of sodium alginate, which was previously established by 1H-13C dipolar profile analysis. The relaxation time of the para-crystalline region of sodium alginate is comparable with that of chitosan, but it is much shorter than that of cellulose and chitin. The order of the molecular correlation time of sodium alginate and chitosan is also the same. Hence, it can be concluded that sodium alginate exhibits greater flexibility than cellulose and chitin. These types of investigation into the local electronic configuration and nuclear spin dynamics at various carbon nuclei sites of the biopolymer at atomic-scale resolution will help in the design of biomimetic materials.
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Affiliation(s)
- Krishna Kishor Dey
- Department of Physics, Dr. Harisingh Gour Central University, Sagar, 470003, India
| | - Shovanlal Gayen
- Department of Pharmaceutical Sciences, Dr. Harisingh Gour Central University, Sagar, 470003, India
| | - Manasi Ghosh
- Physics Section, MMV, Banaras Hindu University, Varanasi, 221005, India.
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Bhowal R, Balaraman AA, Ghosh M, Dutta S, Dey KK, Chopra D. Probing Atomistic Behavior To Unravel Dielectric Phenomena in Charge Transfer Cocrystals. J Am Chem Soc 2020; 143:1024-1037. [DOI: 10.1021/jacs.0c11459] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Rohit Bhowal
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhauri, Bhopal 462066, Madhya Pradesh, India
| | - Anina Anju Balaraman
- Materials Science Division, Council of Scientific and Industrial Research, National Aerospace Laboratories, Kodihalli, Bengaluru 560017, Karnataka, India
| | - Manasi Ghosh
- Physics Section, Mahila Maha Vidyalaya, Banaras Hindu University, Varanasi 221005, Uttar Pradesh, India
| | - Soma Dutta
- Materials Science Division, Council of Scientific and Industrial Research, National Aerospace Laboratories, Kodihalli, Bengaluru 560017, Karnataka, India
| | - Krishna Kishor Dey
- Department of Physics, Dr. Harisingh Gour Central University, Sagar 470003, Madhya Pradesh, India
| | - Deepak Chopra
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhauri, Bhopal 462066, Madhya Pradesh, India
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