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Shuvo MSH, Putul RA, Hossain KS, Masum SM, Molla MAI. Photocatalytic Removal of Metronidazole Antibiotics from Water Using Novel Ag-N-SnO 2 Nanohybrid Material. TOXICS 2024; 12:36. [PMID: 38250992 PMCID: PMC10820245 DOI: 10.3390/toxics12010036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2023] [Revised: 12/16/2023] [Accepted: 12/19/2023] [Indexed: 01/23/2024]
Abstract
In this study, we employed a straightforward synthetic approach using the sol-gel method to fabricate a novel photocatalyst, Ag and N co-doped SnO2 (Ag-N-SnO2). The synthesized photocatalysts underwent characterization through various techniques including XRD, FTIR, FESEM-EDS, TEM, UV-vis DRS, BET, and XPS. The UV-vis DRS results confirmed a reduction in the bandgap energy of Ag-N-SnO2, leading to enhanced absorption of visible light. Additionally, TEM data demonstrated a smaller particle size for Ag-N-SnO2, and BET analysis revealed a significant increase in surface area compared to SnO2.The efficiency of the Ag-N-SnO2 photocatalyst in degrading metronidazole (MNZ) under natural sunlight surpassed that of SnO2. Under optimal conditions (Ag-N-SnO2 concentration of 0.4 g/L, MNZ concentration of 10 mg/L, pH 9, and 120 min of operation), the highest MNZ photocatalytic removal reached 97.03%. The reaction kinetics followed pseudo-first-order kinetics with a rate constant of 0.026 min-1. Investigation into the mineralization of MNZ indicated a substantial decrease in total organic carbon (TOC) values, reaching around 56% in 3 h of sunlight exposure. To elucidate the photocatalytic degradation mechanism of MNZ with Ag-N-SnO2, a scavenger test was employed which revealed the dominant role of •O2-. The results demonstrated the reusability of Ag-N-SnO2 for up to four cycles, highlighting its cost-effectiveness and environmental friendliness as a photocatalyst.
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Affiliation(s)
- Md. Shahriar Hossain Shuvo
- Department of Applied Chemistry and Chemical Engineering, Faculty of Engineering and Technology, University of Dhaka, Dhaka 1000, Bangladesh; (M.S.H.S.); (R.A.P.)
| | - Rupna Akther Putul
- Department of Applied Chemistry and Chemical Engineering, Faculty of Engineering and Technology, University of Dhaka, Dhaka 1000, Bangladesh; (M.S.H.S.); (R.A.P.)
| | - Khandker Saadat Hossain
- Nanophysics and Soft Matter Laboratory, Department of Physics, Faculty of Science, University of Dhaka, Dhaka 1000, Bangladesh;
| | - Shah Md. Masum
- Department of Applied Chemistry and Chemical Engineering, Faculty of Engineering and Technology, University of Dhaka, Dhaka 1000, Bangladesh; (M.S.H.S.); (R.A.P.)
| | - Md. Ashraful Islam Molla
- Department of Applied Chemistry and Chemical Engineering, Faculty of Engineering and Technology, University of Dhaka, Dhaka 1000, Bangladesh; (M.S.H.S.); (R.A.P.)
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TLC–Densitometric Analysis of Selected 5-Nitroimidazoles. Processes (Basel) 2023. [DOI: 10.3390/pr11010170] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
Metronidazole, ornidazole, tinidazole, and secnidazole are 5-nitroimidazoles. The purpose of this work was to propose a new economical TLC–densitometric method to evaluate the chemical stability of metronidazole, secnidazole, ornidazole, and tinidazole under stress conditions. A forced degradation study was performed on silica gel and aqueous solutions at various pH values; the metronidazole, secnidazole, ornidazole, and tinidazole solutions were prepared in saline and in hydrogen peroxide, respectively. The samples of the 5-nitroimidazoles were heated. TLC analyses were performed on silica gel 60F254 using chloroform–methanol (9:1, v/v) as the mobile phase. As the TLC–densitometric method can effectively separate the metronidazole, secnidazole, ornidazole, and tinidazole from their degradation products which formed as a result of the stress studies, it is considered to can be a good alternative and important tool in the routine quality control and stability testing of metronidazole, secnidazole, ornidazole, and tinidazole in pharmaceutical formulations. The results indicate that the proposed TLC–densitometric method is cost-effective, rapid, specific, accurate, and precise; the TLC–densitometric method also realizes the criterion of the linearity. A major advantage of the proposed method is its low cost and ability to analyze the 5-nitroimidazole which was investigated and all its degradation products simultaneously.
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Murgia D, Angellotti G, Conigliaro A, Carfi Pavia F, D’Agostino F, Contardi M, Mauceri R, Alessandro R, Campisi G, De Caro V. Development of a Multifunctional Bioerodible Nanocomposite Containing Metronidazole and Curcumin to Apply on L-PRF Clot to Promote Tissue Regeneration in Dentistry. Biomedicines 2020; 8:E425. [PMID: 33081183 PMCID: PMC7602740 DOI: 10.3390/biomedicines8100425] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2020] [Revised: 10/13/2020] [Accepted: 10/14/2020] [Indexed: 11/17/2022] Open
Abstract
Teeth extractions are often followed by alveolar bone reabsorption, although an adequate level of bone is required for reliable rehabilitations by dental implants. Leukocyte and platelet-rich fibrin (L-PRF) has been widely applied in regenerative procedures and with antibiotic and antioxidant agents could play an essential role in hard and soft tissue healing. In this work, a nanocomposite (Sponge-C-MTR) consisting of a hyaluronate-based sponge loaded with metronidazole (MTR) and nanostructured lipid carriers containing curcumin (CUR-NLC) was designed to be wrapped in the L-PRF™ membrane in the post-extraction sockets and characterized. CUR-NLCs, obtained by homogenization followed by high-frequency sonication of the lipid mixture, showed loading capacity (5% w/w), drug recovery (95% w/w), spherical shape with an average particle size of 112.0 nm, and Zeta potential of -24 mV. Sponge-C-MTR was obtained by entrapping CUR-NLC in a hydrophilic matrix by a freeze-drying process, and physico-chemical and cytocompatibility properties were evaluated. Moreover, the aptitude of CUR and MTR to the penetrate and/or permeate both L-PRF™ and porcine buccal tissue was assessed, highlighting MTR penetration and CUR accumulation promoted by the system. The results positively support the action of nanocomposite in dental tissues regeneration when applied together with the L-PRF™.
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Affiliation(s)
- Denise Murgia
- Dipartimento di Discipline Chirurgiche, Oncologiche e Stomatologiche, Università degli Studi di Palermo, 90127 Palermo, Italy; (G.A.); (R.M.); (G.C.)
- Dipartimento di Scienze e Tecnologie Biologiche Chimiche e Farmaceutiche (STEBICEF), Università degli Studi di Palermo, 90123 Palermo, Italy;
| | - Giuseppe Angellotti
- Dipartimento di Discipline Chirurgiche, Oncologiche e Stomatologiche, Università degli Studi di Palermo, 90127 Palermo, Italy; (G.A.); (R.M.); (G.C.)
- Dipartimento di Scienze e Tecnologie Biologiche Chimiche e Farmaceutiche (STEBICEF), Università degli Studi di Palermo, 90123 Palermo, Italy;
| | - Alice Conigliaro
- Dipartimento di Biomedicina, Neuroscienze e Diagnostica avanzata Università degli Studi di Palermo, 90127 Palermo, Italy; (A.C.); (R.A.)
| | - Francesco Carfi Pavia
- Dipartimento di Ingegneria, Università degli Studi di Palermo, 90128 Palermo, Italy;
| | - Fabio D’Agostino
- Istituto per lo Studio degli Impatti Antropici e Sostenibilità dell’Ambiente Marino, Consiglio Nazionale delle Ricerche (IAS—CNR), Campobello di Mazara, 91021 Trapani, Italy;
| | - Marco Contardi
- Smart Materials, Istituto Italiano di Tecnologia, 16163 Genova, Italy;
| | - Rodolfo Mauceri
- Dipartimento di Discipline Chirurgiche, Oncologiche e Stomatologiche, Università degli Studi di Palermo, 90127 Palermo, Italy; (G.A.); (R.M.); (G.C.)
| | - Riccardo Alessandro
- Dipartimento di Biomedicina, Neuroscienze e Diagnostica avanzata Università degli Studi di Palermo, 90127 Palermo, Italy; (A.C.); (R.A.)
| | - Giuseppina Campisi
- Dipartimento di Discipline Chirurgiche, Oncologiche e Stomatologiche, Università degli Studi di Palermo, 90127 Palermo, Italy; (G.A.); (R.M.); (G.C.)
| | - Viviana De Caro
- Dipartimento di Scienze e Tecnologie Biologiche Chimiche e Farmaceutiche (STEBICEF), Università degli Studi di Palermo, 90123 Palermo, Italy;
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Wróblewska M, Szymańska E, Szekalska M, Winnicka K. Different Types of Gel Carriers as Metronidazole Delivery Systems to the Oral Mucosa. Polymers (Basel) 2020; 12:polym12030680. [PMID: 32204334 PMCID: PMC7182799 DOI: 10.3390/polym12030680] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2020] [Revised: 03/17/2020] [Accepted: 03/17/2020] [Indexed: 01/18/2023] Open
Abstract
Periodontal diseases are some of the most widespread oral afflictions, and they are labeled as chronic infections caused by the accumulation of bacteria in dental plaque that produces localized inflammation of the periodontium. The use of local drug delivery systems to treat periodontal diseases has received greater attention, because the active substance is targeted directly to the affected area, which minimizes its systemic side effects. Therefore, the purpose of the investigation was to develop and characterize different types of gel formulations-bigel, hydrogel and oleogel-as local delivery systems containing metronidazole (MET), which can be applied to the oral mucosa. The influence of the formulation type on the mechanical, rheological and mucoadhesive properties were examined. Moreover, in vitro release of metronidazole, its ex vivo permeation through buccal porcine mucosa and antimicrobial activity measured by the plate diffusion method were estimated. It was found that the gel formulations obtained were non-Newtonian systems, showing a shear-thinning behavior and thixotropic properties with good textural features such as firmness, compressibility and adhesiveness. Moreover, the preparations designed possessed beneficial mucoadhesive properties. The formulated hydrogels and bigels containing micronized MET were considered as better formulations in terms of drug release and antimicrobial activity compared to commercially available metronidazole ointment. An ex vivo permeation study with the use of porcine buccal mucosa demonstrated that the bigel formulation was characterized by higher initial permeability rate providing a fast therapeutic effect with simultaneous moderate retention in mucosal tissue to decrease the risk of local cytotoxicity.
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Biodegradation of antibiotics: The new resistance determinants – part II. N Biotechnol 2020; 54:13-27. [DOI: 10.1016/j.nbt.2019.08.003] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2018] [Revised: 07/17/2019] [Accepted: 08/11/2019] [Indexed: 02/06/2023]
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Murgia D, Angellotti G, D'Agostino F, De Caro V. Bioadhesive Matrix Tablets Loaded with Lipophilic Nanoparticles as Vehicles for Drugs for Periodontitis Treatment: Development and Characterization. Polymers (Basel) 2019; 11:E1801. [PMID: 31684081 PMCID: PMC6918209 DOI: 10.3390/polym11111801] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2019] [Revised: 10/29/2019] [Accepted: 10/30/2019] [Indexed: 12/12/2022] Open
Abstract
Periodontitis treatment is usually focused on the reduction or eradication of periodontal pathogens using antibiotics against anaerobic bacteria, such as metronidazole (MTR). Moreover, recently the correlation between periodontal diseases and overexpression of reactive oxygen species (ROS) led to the introduction of antioxidant biomolecules in therapy. In this work, bioadhesive buccal tablets, consisting of a hydrophilic matrix loaded with metronidazole and lipophilic nanoparticles as a vehicle of curcumin, were developed. Curcumin (CUR)-loaded nanostructured lipid carriers (NLC) were prepared using glycyrrhetic acid, hexadecanol, isopropyl palmitate and Tween®80 as a surfactant. As method, homogenization followed by high-frequency sonication was used. After dialysis, CUR-NLC dispersion was evaluated in terms of drug loading (DL, 2.2% w/w) and drug recovery (DR, 88% w/w). NLC, characterized by dynamic light scattering and scanning electron microscopy (SEM), exhibited a spherical shape, an average particle size of 121.6 nm and PDI and PZ values considered optimal for a colloidal nanoparticle dispersion indicating good stability of the system. Subsequently, a hydrophilic sponge was obtained by lyophilization of a gel based on trehalose, Natrosol and PVP-K90, loaded with CUR-NLC and MTR. By compression of the sponge, matrix tablets were obtained and characterized in term of porosity, swelling index, mucoadhesion and drugs release. The ability of the matrix tablets to release CUR and MTR when applied on buccal mucosa and the aptitude of actives to penetrate and/or permeate the tissue were evaluated. The data demonstrate the ability of NLC to promote the penetration of CUR into the lipophilic domains of the mucosal membrane, while MTR can penetrate and permeate the mucosal tissue, where it can perform a loco-regional antibacterial activity. These results strongly support the possibility of using this novel matrix tablet for delivering MTR together with CUR for topical treatment of periodontal diseases.
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Affiliation(s)
- Denise Murgia
- Dipartimento di Discipline Chirurgiche, Oncologiche e Stomatologiche, Università degli Studi di Palermo, 90127 Palermo, Italy.
- Dipartimento di Scienze e Tecnologie Biologiche Chimiche e Farmaceutiche (STEBICEF), Università degli Studi di Palermo, 90123 Palermo, Italy.
| | - Giuseppe Angellotti
- Dipartimento di Scienze e Tecnologie Biologiche Chimiche e Farmaceutiche (STEBICEF), Università degli Studi di Palermo, 90123 Palermo, Italy.
| | - Fabio D'Agostino
- Istituto per lo Studio degli Impatti Antropici e Sostenibilità dell'Ambiente Marino, Consiglio Nazionale delle Ricerche (IAS - CNR), Campobello di Mazara, 91021 Trapani, Italy.
| | - Viviana De Caro
- Dipartimento di Scienze e Tecnologie Biologiche Chimiche e Farmaceutiche (STEBICEF), Università degli Studi di Palermo, 90123 Palermo, Italy.
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Lis H, Stepnowski P, Caban M. Salinity and pH as factors affecting the passive sampling and extraction of pharmaceuticals from water. J Sep Sci 2019; 42:2949-2956. [PMID: 31267662 DOI: 10.1002/jssc.201900346] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2019] [Revised: 06/24/2019] [Accepted: 06/27/2019] [Indexed: 11/05/2022]
Abstract
Passive sampling is an attractive technique for the long-term monitoring of pharmaceuticals in the water environment. The reliability of the received results depends on the properly performed calibration, namely the determination of analyte sampling rates. This step can be the source of a systematic error, as the sampling rate values are dependent on the water donor phase parameters. This is especially important for pharmaceuticals, since their chemical characteristics and ionic form change with pH. In this study, the cross-effect of pH (3, 7, and 9) and salinity (0, 7, and 35 practical salinity unit, using artificial sea water) on the passive sampling of 21 pharmaceuticals (antiparasitics, beta-blockers, non-steroidal anti-inflammatory drugs, sulfonamides) was tested. The primarily determined parameter was the sampling rate. In addition, the extraction efficiency, partitioning coefficient, and the concentration of the analytes on the sorbent were calculated. Generally, for the non-steroidal anti-inflammatory drugs, beta-blockers, and antiparasitics, the change both in pH and salinity had a negligible impact on the mentioned experimental parameters. In contrast, the extraction of sulfonamides was impacted by both pH and salinity, while lipophilicity was not a decisive parameter.
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Affiliation(s)
- Hanna Lis
- Institute for Environmental and Human Health Protection, Faculty of Chemistry, University of Gdansk, Gdańsk, Poland
| | - Piotr Stepnowski
- Institute for Environmental and Human Health Protection, Faculty of Chemistry, University of Gdansk, Gdańsk, Poland
| | - Magda Caban
- Institute for Environmental and Human Health Protection, Faculty of Chemistry, University of Gdansk, Gdańsk, Poland
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Eleftheriadis T, Pissas G, Sounidaki M, Antoniadi G, Antoniadis N, Liakopoulos V, Stefanidis I. In human cell cultures, everolimus is inferior to tacrolimus in inhibiting cellular alloimmunity, but equally effective as regards humoral alloimmunity. Int Urol Nephrol 2017; 49:1691-1697. [PMID: 28508247 DOI: 10.1007/s11255-017-1615-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2017] [Accepted: 05/09/2017] [Indexed: 12/31/2022]
Abstract
PURPOSE Acute cellular rejection is the major cause of immune-mediated graft failure early in the course of kidney transplantation, whereas chronic antibody-mediated rejection is a major contributor to graft loss in the late post-transplant phase. Based mainly on the results of short-term studies, the calcineurin inhibitor tacrolimus prevails over the mammalian target of rapamycin (mTOR) inhibitors. However, the toxicity profile of the two drug categories differs, making the interchange between them appealing. In this study, the effect of tacrolimus and of the mTOR inhibitor everolimus on cellular and humoral alloimmunity was evaluated. METHODS Cellular alloimmunity was assessed by cell proliferation in two-way mixed lymphocyte reaction (MLR) with human peripheral blood mononuclear cells (PBMC). For assessing humoral alloimmunity, we developed a method in which humoral alloimmunity was induced in a one-way MLR. The de novo production of alloantibodies was measured with an antibody-mediated complement-dependent cytotoxicity assay, in which supernatants from the above MLRs were used against resting PBMC similar to the stimulator cells of the forementioned MLRs. Tacrolimus and everolimus were used at concentrations near their upper recommended trough levels. RESULTS In two-way MLRs, tacrolimus inhibited cell proliferation more than everolimus. In one-way MLRs, tacrolimus and everolimus decreased alloantibody production to the same extent. CONCLUSIONS In human cell cultures, everolimus is inferior to tacrolimus in inhibiting cellular alloimmunity, but equally effective as regards humoral alloimmunity. Thus, everolimus might be a safe alternative in case of tacrolimus toxicity, particularly after the early period of kidney transplantation.
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Affiliation(s)
- Theodoros Eleftheriadis
- Department of Nephrology, Faculty of Medicine, University of Thessaly, Neo Ktirio, Mezourlo Hill, 411 10, Larissa, Greece.
| | - Georgios Pissas
- Department of Nephrology, Faculty of Medicine, University of Thessaly, Neo Ktirio, Mezourlo Hill, 411 10, Larissa, Greece
| | - Maria Sounidaki
- Department of Nephrology, Faculty of Medicine, University of Thessaly, Neo Ktirio, Mezourlo Hill, 411 10, Larissa, Greece
| | - Georgia Antoniadi
- Department of Nephrology, Faculty of Medicine, University of Thessaly, Neo Ktirio, Mezourlo Hill, 411 10, Larissa, Greece
| | - Nikolaos Antoniadis
- Organ Transplant Unit, Hippokration General Hospital, Faculty of Medicine, Aristotle University of Thessaloniki, 546 42, Thessaloniki, Greece
| | - Vassilios Liakopoulos
- Department of Nephrology, Faculty of Medicine, University of Thessaly, Neo Ktirio, Mezourlo Hill, 411 10, Larissa, Greece
| | - Ioannis Stefanidis
- Department of Nephrology, Faculty of Medicine, University of Thessaly, Neo Ktirio, Mezourlo Hill, 411 10, Larissa, Greece
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Kim GH, Kim J, Pai H, Kang JO. Comparison of supplemented Brucella agar and modified Clostridium difficile agar for antimicrobial susceptibility testing of Clostridium difficile. Ann Lab Med 2014; 34:439-45. [PMID: 25368819 PMCID: PMC4215411 DOI: 10.3343/alm.2014.34.6.439] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2014] [Revised: 04/16/2014] [Accepted: 08/27/2014] [Indexed: 12/18/2022] Open
Abstract
Background Antimicrobial susceptibility testing (AST) of Clostridium difficile is increasingly important because of the rise in resistant strains. The standard medium for the AST of C. difficile is supplemented Brucella agar (sBA), but we found that the growth of C. difficile on sBA was not optimal. Because active growth is critical for reliable AST, we developed a new, modified C. difficile (mCD) agar. C. difficile grew better on mCD agar than on sBA. Methods C. difficile isolates were collected from patients with healthcare-associated diarrhea. sBA medium was prepared according to the CLSI guidelines. Homemade mCD agar containing taurocholate, L-cysteine hydrochloride, and 7% horse blood was used. For 171 C. difficile isolates, we compared the agar dilution AST results from mCD agar with those from sBA. Results No significant differences were observed in the 50% minimal inhibitory concentration (MIC50) and 90% minimal inhibitory concentration (MIC90) of clindamycin (CLI), metronidazole (MTZ), moxifloxacin (MXF), piperacillin-tazobactam (PTZ), and rifaximin (RIX), but the values for vancomycin (VAN) were two-fold higher on mCD agar than on sBA. The MICs of CLI, MXF, and RIX were in 100% agreement within two-fold dilutions, but for MTZ, VAN, and PTZ, 13.7%, 0.6%, and 3.1% of the isolates, respectively, were outside the acceptable range. Conclusions The MIC ranges, MIC50 and MIC90, were acceptable when AST was performed on mCD agar. Thus, mCD agar could be used as a substitute medium for the AST of C. difficile.
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Affiliation(s)
- Gye Hyeong Kim
- Department of Laboratory Medicine, Hanyang University College of Medicine, Seoul, Korea
| | - Jieun Kim
- Department of Internal Medicine, Hanyang University College of Medicine, Seoul, Korea
| | - Hyunjoo Pai
- Department of Internal Medicine, Hanyang University College of Medicine, Seoul, Korea
| | - Jung Oak Kang
- Department of Laboratory Medicine, Hanyang University College of Medicine, Seoul, Korea
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Vertzoni M, Carlsson A, Abrahamsson B, Goumas K, Reppas C. Degradation kinetics of metronidazole and olsalazine by bacteria in ascending colon and in feces of healthy adults. Int J Pharm 2011; 413:81-6. [DOI: 10.1016/j.ijpharm.2011.04.028] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2011] [Revised: 04/08/2011] [Accepted: 04/14/2011] [Indexed: 01/19/2023]
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Jain R, Wu Z, Bork O, Tucker IG. Pre-formulation and chemical stability studies of penethamate, a benzylpenicillin ester prodrug, in aqueous vehicles. Drug Dev Ind Pharm 2011; 38:55-63. [DOI: 10.3109/03639045.2011.590497] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Amani A, Amini MA, Ali HSM, York P. Alternatives to conventional suspensions for pulmonary drug delivery by nebulisers: a review. J Pharm Sci 2011; 100:4563-70. [PMID: 21671227 DOI: 10.1002/jps.22665] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2011] [Revised: 04/09/2011] [Accepted: 05/24/2011] [Indexed: 01/31/2023]
Abstract
This review discusses the reports of alternative dosage forms to suspension formulations of hydrophobic drugs for nebulisers. Suspensions for nebulisers, although widely used over recent years, have several limitations which have led to pharmaceutical researchers looking for alternative, better performing preparations. Particular attention has been directed towards the use of nanoparticles as carriers of hydrophobic active ingredients. Several nanoformulations have been prepared and compared in vitro and/or in vivo with the corresponding microsuspension formulation. It is also clear that future studies in this field should address the parallel important aspects of safety and economical aspects of nanoparticualte formulations.
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Affiliation(s)
- Amir Amani
- Department of Medical Nanotechnology, School of Advanced Medical Technologies, Tehran University of Medical Sciences, Tehran 1417614411, Iran.
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Synergic effect of metronidazole and pyrantel pamoate on Giardia lamblia. Parasitol Int 2011; 60:54-8. [DOI: 10.1016/j.parint.2010.10.003] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2010] [Revised: 09/15/2010] [Accepted: 10/05/2010] [Indexed: 11/17/2022]
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Murakami K, Okimoto T, Kodama M, Sato R, Miyajima H, Ono M, Inoue K, Watanabe K, Otsu S, Fujioka T. Comparison of amoxicillin-metronidazole plus famotidine or lansoprazole for amoxicillin-clarithromycin-proton pump inhibitor treatment failures for Helicobacter pylori infection. Helicobacter 2006; 11:436-40. [PMID: 16961805 DOI: 10.1111/j.1523-5378.2006.00435.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
BACKGROUND Proton pump inhibitor-amoxicillin-metronidazole is recommended as second-line Helicobacter pylori therapy in Japan. The authors assessed the efficacy and safety of second-line eradication using the H2-receptor antagonist famotidine as a substitute for proton pump inhibitor. MATERIALS AND METHODS Sixty-one patients who failed in first-line H. pylori eradication using proton pump inhibitor-clarithromycin-amoxicillin were randomly assigned to either second-line therapy including metronidazole: a 7-day course of lansoprazole 30 mg, amoxicillin 750 mg, and metronidazole 250 mg, b.i.d. (lansoprazole group); or a 7-day course of famotidine 40 mg, amoxicillin 750 mg, and metronidazole 250 mg, b.i.d. (famotidine group). Eradication was assessed for each group at least 4 weeks after completing eradication therapy. Drug susceptibility test was performed using 57 strains in pretreatment to clarithromycin, metronidazole, and amoxicillin. RESULTS Prior to second-line H. pylori eradication, the rate of resistance to clarithromycin was high at 84% (48/57). Similarly, resistance to metronidazole was low at 5.3% (3/57); however, no amoxicillin-resistant strains were found. The eradication rates for both lansoprazole and famotidine treatment groups were high at 97% (29/30) and 94% (29/31), respectively. CONCLUSIONS Famotidine treatment including metronidazole-amoxicillin as second-line therapy provided a high eradication rate similar to lansoprazole therapy. Famotidine is therefore expected to serve as a useful H. pylori eradication regimen in patients with proton pump inhibitor allergy, an economic benefit in terms of reduced health-care costs is also anticipated.
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Affiliation(s)
- Kazunari Murakami
- Department of Gastroenterology, Faculty of Medicine, Oita University, 1-1 Idaigaoka Hasama, Oita 879-5593, Japan.
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Salo JPK, Yli-Kauhaluoma J, Salomies H. On the hydrolytic behavior of tinidazole, metronidazole, and ornidazole. J Pharm Sci 2003; 92:739-46. [PMID: 12661060 DOI: 10.1002/jps.10349] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Using two UV-spectrophotometric methods, the hydrolysis of tinidazole was studied at pH 1.00-8.45 at 80 degrees C. The reaction followed apparent first-order kinetics throughout the studied range. No kinetic salt effect was detected, indicating that at least one of the reacting partners forming the transition state has a charge of 0. The reaction rate macro constants M(1)-M(4) were calculated to be 3.35 x 10(-2) M(-1) h(-1), 1.45 x 10(-2) h(-1), 3.76 x 10(-6) M h(-1), and 2.85 x 10(-11) M(2) h(-1), respectively. At pH >or= 7, the uncharged tinidazole was decomposed by the hydroxide ion; the reaction was found out to involve a proton transfer from the ethylsulfonylethyl side chain. At around pH 4.5, the degradation of the uncharged tinidazole was due to the solvent. In more acidic conditions, the reaction mechanism could not be fully resolved. The alkaline hydrolysis of metronidazole was studied on the basis of literature data. A general reaction mechanism was proposed, but an unequivocal explanation for the inflection point in the pH rate profile at pH 6 could not be found. The implications of the proposed reaction mechanism for the hydrolytic behavior of ornidazole were discussed.
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Affiliation(s)
- Jukka-Pekka K Salo
- Division of Pharmaceutical Chemistry, Department of Pharmacy, P.O. Box 56, Viikinkaari 5 E, FIN-00014, University of Helsinki, Helsinki, Finland.
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Abstract
The delivery of antimicrobial drugs to Helicobacter pylori within the stomach is poorly understood. The gastric environment represents a unique pharmacokinetic compartment, into which drug can be delivered directly following oral administration, or indirectly following intestinal absorption and transfer from the blood into the stomach across the gastric mucosa. Several methods have been used to study drug disposition across the gastric mucosa, including endoscopic biopsy studies, nasogastric intubation studies and animal models. Direct, or topical, delivery is limited by luminal drug degradation, drug formulation and the permeability of the mucus layer. Indirect, or systemic, delivery is limited by factors affecting the concentration gradient across the gastric mucosa and the permeability of the mucosa. These factors include intragastric pH, plasma protein binding, drug lipophilicity, the presence of active transport mechanisms, drugs that damage the gastric mucosa and inflammation secondary to H. pylori infection. Little is known about the last of these, and further research in this area should help in the rational approach to development of treatments against H. pylori.
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Affiliation(s)
- A F Goddard
- Division of Gastroenterology, University Hospital, Nottingham, UK
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van der Houwen O, de Loos M, Beijnen J, Bult A, Underberg W. Systematic interpretation of pH-degradation profiles. A critical review. Int J Pharm 1997. [DOI: 10.1016/s0378-5173(97)00156-7] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Salo JP, Salomies H. High performance thin layer chromatographic analysis of hydrolyzed tinidazole solutions. II. Hydrolysis kinetics of tinidazole. J Pharm Biomed Anal 1996; 14:1267-70. [PMID: 8818044 DOI: 10.1016/s0731-7085(96)01768-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
In a citrate-borate-phosphate buffer, 5 mM tinidazole solutions exhibited maximum stability stability around pH 4.0-5.0. The hydrolysis of tinidazole was mostly a first-order reaction. At pH 10.0 and 60-80 degrees C, tinidazole had an activation energy of 122 kJ mol-1 for hydrolysis. It was postulated that tinidazole decomposes by different mechanisms under basic and neutral/acidic conditions.
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Affiliation(s)
- J P Salo
- Department of Pharmacy, University of Helsinki, Finland
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