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Liu S, Hou X, Xin Q, Wang Y, Xin Y, Liu G, Zhou C, Liu H, Yan Q. Degradation of rifamycin from mycelial dreg by activated persulfate: Degradation efficiency and reaction kinetics. Sci Total Environ 2022; 821:153229. [PMID: 35051483 DOI: 10.1016/j.scitotenv.2022.153229] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2021] [Revised: 01/13/2022] [Accepted: 01/13/2022] [Indexed: 06/14/2023]
Abstract
Rifamycin mycelial dreg (RMD) is a biological waste, and its residual rifamycin (RIF) is potentially harmful to both the environment and human health. In this work, thermally activated persulfate (PDS) oxidative degradation of RIF in RMD was developed for the first time. The effects of reaction temperature, initial PDS concentration, and pH on RIF degradation in RMD were investigated, and the treatment conditions were optimized using response surface methodology (RSM). The results showed that 90 °C, 50 mg/g PDS, and pH = 5.3 were the optimal pretreatment conditions, and 100% degradation efficiency of RIF (734 mg/kg) was achieved. SEM and FTIR analyses confirmed that the RIF was destroyed and decomposed after the oxidation reaction. The possible degradation pathways of RIF in the thermally activated PDS system were discussed through HPLC/MS and ESR analyses. The intermediate product was identified, and the toxicity of the final product was predicted to be low or nontoxic. In this work, a degradation pathway of RMD was proposed by activating persulfate, which facilitates subsequent resource utilization and provides meaningful guidance for the practical treatment of antibiotic mycelium residue (AMR).
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Affiliation(s)
- Shiqi Liu
- Qingdao Engineering Research Center for Rural Environment, College of Resources and Environment, Qingdao Agricultural University, Qingdao 266109, China
| | - Xiangting Hou
- Qingdao Engineering Research Center for Rural Environment, College of Resources and Environment, Qingdao Agricultural University, Qingdao 266109, China
| | - Qing Xin
- Qingdao Engineering Research Center for Rural Environment, College of Resources and Environment, Qingdao Agricultural University, Qingdao 266109, China
| | - Yuxin Wang
- Qingdao Engineering Research Center for Rural Environment, College of Resources and Environment, Qingdao Agricultural University, Qingdao 266109, China
| | - Yanjun Xin
- Qingdao Engineering Research Center for Rural Environment, College of Resources and Environment, Qingdao Agricultural University, Qingdao 266109, China
| | - Guocheng Liu
- Qingdao Engineering Research Center for Rural Environment, College of Resources and Environment, Qingdao Agricultural University, Qingdao 266109, China
| | - Chengzhi Zhou
- Qingdao Engineering Research Center for Rural Environment, College of Resources and Environment, Qingdao Agricultural University, Qingdao 266109, China
| | - Huiling Liu
- School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China
| | - Qinghua Yan
- Qingdao Engineering Research Center for Rural Environment, College of Resources and Environment, Qingdao Agricultural University, Qingdao 266109, China.
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Przybylski P, Pyta K, Klich K, Schilf W, Kamieński B. 13C and 15N CP/MAS, 1H-15N SCT CP/MAS and FTIR spectroscopy as tools for qualitative detection of the presence of zwitterionic and non-ionic forms of ansa-macrolide 3-formylrifamycin SV and its derivatives in solid state. Magn Reson Chem 2014; 52:10-21. [PMID: 24347399 DOI: 10.1002/mrc.4028] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/04/2013] [Revised: 10/09/2013] [Accepted: 10/10/2013] [Indexed: 06/03/2023]
Abstract
(13)C, (15)N CP/MAS, including (1)H-(13)C and (1)H-(15)N short contact time CP/MAS experiments, and FTIR methods were applied for detailed structural characterization of ansa-macrolides as 3-formylrifamycin SV (1) and its derivatives (2-6) in crystal and in powder forms. Although HPLC chromatograms for 2/CH3 OH and 2/CH3 CCl3 were the same for rifampicin crystals dissolved in respective solvents, the UV-vis data recorded for them were different in 300-375 nm region. Detailed solid state (13)C and (15)N CP/MAS NMR and FTIR studies revealed that rifampicin (2), in contrast to 3-formylrifamycin SV (1) and its amino derivatives (3-6), can occur in pure non-ionic or zwitterionic forms in crystal and in pure these forms or a mixture of them in a powder. Multinuclear CP/MAS and FTIR studies demonstrated also that 3-6 derivatives were present exclusively in pure zwitterionic forms, both in powder and in crystal. On the basis of the solid state NMR and FTIR studies, two conformers of 3-formylrifamycin SV were detected in powder form due to the different orientations of carbonyl group of amide moiety. The PM6 molecular modeling at the semi-empirical level of theory, allowed visualization the most energetically favorable non-ionic and zwitterionic forms of 1-6 antibiotics, strongly stabilized via intramolecular H-bonds. FTIR studies indicated that the originally adopted forms of these type antibiotics in crystal or in powder are stable in standard laboratory conditions in time. The results presented point to the fact that because of a possible presence of two forms of rifampicin (compound 2), quantification of the content of this antibiotic in relevant pharmaceuticals needs caution.
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Affiliation(s)
- Piotr Przybylski
- Faculty of Chemistry, Adam Mickiewicz University, Umultowska 89b, 61-614, Poznan, Poland
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Liuchao, Maixi, Wangchao, Wan C. Impurity profile of rifaximin produced in China. Pharmazie 2012; 67:283-7. [PMID: 22570932 DOI: pmid/22570932] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Impurity profiles of rifaximin produced in China were investigated systematically by LCMS methods. Eleven impurities from the raw materials of rifaximin produced in China were detected. We adopted the Diagnostic fragment-ion-based extension strategy (DFIBES) for deducing the structure of unknown impurities. Impurity 1 was the 30-hydroxylated product of rifaximin. Impurity 2 was the 25-deacetyled rifaximin. Impurity 6 was the isomeride of rifaximin. Impurity 9 was rifamycin-O.
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Affiliation(s)
- Liuchao
- Pharmacy Department of Medical Institute of Nanchang University, Nanchang, China.
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4
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Liuchao, Maixi, Wangchao, Wan C. Impurity profile of rifaximin produced in China. Pharmazie 2012. [PMID: 22570932 DOI: 10.1691/ph.2012.1114] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Impurity profiles of rifaximin produced in China were investigated systematically by LCMS methods. Eleven impurities from the raw materials of rifaximin produced in China were detected. We adopted the Diagnostic fragment-ion-based extension strategy (DFIBES) for deducing the structure of unknown impurities. Impurity 1 was the 30-hydroxylated product of rifaximin. Impurity 2 was the 25-deacetyled rifaximin. Impurity 6 was the isomeride of rifaximin. Impurity 9 was rifamycin-O.
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Affiliation(s)
- Liuchao
- Pharmacy Department of Medical Institute of Nanchang University, Nanchang, China.
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5
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Yang JD, Deng SX, Liu ZF, Kong L, Liu SP. Fluorescence quenching of serum albumin by rifamycin antibiotics and their analytical application. LUMINESCENCE 2007; 22:559-66. [PMID: 17768708 DOI: 10.1002/bio.1001] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
In neutral medium, rifamycin antibiotics such as rifapentin (RFPT), rifampicin (RFP), rifandin (RFD) and rifamycin SV (RFSV) can bind with human serum albumin (HSA) and bovine serum albumin (BSA) to form complexes, resulting in the quenching of the intrinsic fluorescence (lambda(ex)/lambda(em) = 285/355 nm) of the BSA and HSA. The quenching intensity (DeltaF) is directly proportional to the concentration of the rifamycin antibiotics. Therefore, a new analytical method was established to determine trace rifamycin antibiotics. The method had fairly high sensitivity and the detecting limits (3sigma) for RFPT, RFP, RFD and RFSV were 0.85, 0.98, 1.83, 1.89 ng/mL, respectively, for the HSA system and 0.76, 0.89, 1.55, 1.77 ng/mL, respectively, for the BSA system. All relative standard deviations (RSDs) were <3.8%. In this work, the characteristics of the fluorescence spectra were studied and the optimum reaction conditions and influencing factors were investigated. The influence of coexisting substances was tested and the results showed that the method had good selectivity and could be applied to determine trace rifamycin antibiotics in medicine capsules and urine samples. Taking the RFSV-serum albumin system as an example, the reaction mechanisms, such as binding constants, binding sites, binding distance and the type of fluorescence quenching, were investigated.
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Affiliation(s)
- Ji-Dong Yang
- School of Chemistry and Chemical Engineering, Southwest University, Chongqing, People's Republic of China
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Knight JL, Mekler V, Mukhopadhyay J, Ebright RH, Levy RM. Distance-restrained docking of rifampicin and rifamycin SV to RNA polymerase using systematic FRET measurements: developing benchmarks of model quality and reliability. Biophys J 2004; 88:925-38. [PMID: 15542547 PMCID: PMC1305165 DOI: 10.1529/biophysj.104.050187] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
We are developing distance-restrained docking strategies for modeling macromolecular complexes that combine available high-resolution structures of the components and intercomponent distance restraints derived from systematic fluorescence resonance energy transfer (FRET) measurements. In this article, we consider the problem of docking small-molecule ligands within macromolecular complexes. Using simulated FRET data, we have generated a series of benchmarks that permit estimation of model accuracy based on the quantity and quality of FRET-derived distance restraints, including the number, random error, systematic error, distance distribution, and radial distribution of FRET-derived distance restraints. We find that expected model accuracy is 10 A or better for models based on: i), > or =20 restraints with up to 15% random error and no systematic error, or ii), > or =20 restraints with up to 15% random error, up to 10% systematic error, and a symmetric radial distribution of restraints. Model accuracies can be improved to 5 A or better by increasing the number of restraints to > or =40 and/or by optimizing the distance distribution of restraints. Using experimental FRET data, we have defined the positions of the binding sites within bacterial RNA polymerase of the small-molecule inhibitors rifampicin (Rif) and rifamycin SV (Rif SV). The inferred binding sites for Rif and Rif SV were located with accuracies of, respectively, 7 and 10 A relative to the crystallographically defined binding site for Rif. These accuracies agree with expectations from the benchmark simulations and suffice to indicate that the binding sites for Rif and Rif SV are located within the RNA polymerase active-center cleft, overlapping the binding site for the RNA-DNA hybrid.
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Affiliation(s)
- Jennifer L Knight
- Department of Chemistry and Chemical Biology and the BioMaPS Institute for Quantitative Biology, and Howard Hughes Medical Institute, Waksman Institute, Rutgers University, Piscataway, New Jersey 08854, USA
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Alonso Lomillo MA, Domínguez Renedo O, Arcos Martínez MJ. Resolution of Binary Mixtures of Rifamycin SV and Rifampicin by UV/VIS Spectroscopy and Partial Least-Squares Method (PLS). Chem Biodivers 2004; 1:1336-43. [PMID: 17191911 DOI: 10.1002/cbdv.200490096] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
A procedure is proposed for the joint determination of rifamycin SV and rifampicin by UV/VIS spectroscopy. A partial least-squares regression (PLS) was used for the resolution of the overlapping spectrophotometric signals from mixtures of the two drugs. The application of a genetic algorithm to select some of the predictor variables allows one to considerably reduce the number of experimental variables, as well as to improve the prediction capacity of the PLS model constructed with these selected potentials. Finally, the methods were applied to the determination of these drugs in biological samples.
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Affiliation(s)
- M Asunción Alonso Lomillo
- Dpto. de Química, Area de Química Analítica, Facultad de Ciencias, Universidad de Burgos, Plaza Misael Bañuelos, s/n, E-09001 Burgos.
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Abstract
Rifampicin (RIF) hydrolyzes in acidic medium to form insoluble and poorly absorbed 3-Formyl rifamycin SV (3-FRSV). This study describes development of two principally different methods, Dual Wavelength UV-Vis. spectrophotometry (DW spectrophotometry) and HPTLC, to determine 3-FRSV in presence of RIF. Using DW spectrophotometry, RIF was estimated by using wavelengths 475.0 and 507.0 nm and 3-FRSV was estimated using 457.0 and 492.0 nm. In HPTLC method, a mixture of chloroform:methanol:water (80:20:2.5 v/v) was used as the mobile phase to resolve 3-FRSV from RIF and 3-FRSV was quantified at 333 nm. The linearity range for 3-FRSV was 2-10 microg/ml and 50-250 ng/spot for DW spectrophotometric method and HPTLC method, respectively, and 5-50 microg/ml for RIF using DW spectrophotometric method. Both the methods were found to be specific, accurate and reproducible. The proposed methods were successfully applied to determine the rate of degradation of RIF to 3-FRSV in dissolution medium (0.1 N HCl) and also in presence of isoniazid (INH). The rate of degradation of RIF in presence of INH was almost two times more than that of RIF alone. These methods were utilized to study the stability of RIF in market formulations of RIF and RIF with INH in dissolution medium. It has been observed that RIF degrades by 12.4% to form 3-FRSV (RIF formulations) while in presence of INH the degradation is catalyzed to about 21.5% (RIF+INH formulations), in 45 min. Thus, lower concentration of RIF may be available for absorption leading to poor bioavailability of RIF from combination dosage forms (RIF+INH) as compared to formulations containing only RIF. It is proposed that specific analytical method should be used to measure RIF in presence of 3-FRSV in a dissolution study.
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Affiliation(s)
- C J Shishoo
- Department of Quality Assurance, L.M. College of Pharmacy, P.O. Box 4011, Navrangpura, Ahmedabad, India.
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Hosoe K, Konishi E, Hidaka T, Yamane T, Yamashita K, Ohashi T. High-performance liquid chromatographic determination of 3'-hydroxy-5'-(4-isobutyl-1-piperazinyl)benzoxazinorifamycin (KRM-1648) and its deacetyl metabolite in plasma, whole blood, urine and tissue samples in rats. J Chromatogr B Biomed Appl 1994; 653:177-86. [PMID: 8205245 DOI: 10.1016/0378-4347(93)e0431-o] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
A reversed-phase high-performance liquid chromatographic method was developed for the determination of 3'-hydroxy-5'-(4-isobutyl-1-piperazinyl)benzoxazinorifamycin (KRM-1648, I), a new rifamycin derivative, and its 25-deacetyl metabolite (KRM-1671, II) in plasma, whole blood, tissues and urine from rats. I and II were coextracted with an internal standard from each sample matrix by solid-phase extraction (Bond Elut). Plasma and urine were directly loaded onto Bond Elut, while whole blood and tissues were homogenized and extracted with methanol or dichloromethane-chloroform prior to Bond Elut extraction. The extracts were chromatographed on Shim-pack CLC-ODS(M) using acetonitrile-0.02 M citrate buffer containing 0.1 M sodium perchlorate (2:1, v/v), and peaks were detected at 643 nm. The validation data showed that the assays for I and II in plasma, whole blood, tissues and urine were selective, accurate and reproducible.
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Affiliation(s)
- K Hosoe
- Biochemical Research Laboratories, Kaneka Corporation, Hyogo, Japan
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Brown ST, Edwards FF, Bernard EM, Tong W, Armstrong D. Azithromycin, rifabutin, and rifapentine for treatment and prophylaxis of Mycobacterium avium complex in rats treated with cyclosporine. Antimicrob Agents Chemother 1993; 37:398-402. [PMID: 8384809 PMCID: PMC187683 DOI: 10.1128/aac.37.3.398] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
Azithromycin, rifabutin, and rifapentine were used to treat or prevent disseminated Mycobacterium avium complex (MAC) infections produced in rats immunosuppressed with cyclosporine. Animals with bacteremic infections were treated 1 week after intravenous inoculation with 10(7) CFU of MAC with azithromycin, 100 mg/kg of body weight administered subcutaneously for 5 days and then 75 mg/kg on Monday, Wednesday, and Friday, or with rifabutin or rifapentine, 20 mg/kg administered intraperitoneally on Monday through Friday. All three drugs showed efficacy after 1 and 2 months. Rifabutin cleared the organisms from tissues more rapidly than azithromycin or rifapentine. To approximate prophylaxis, treatment was started 2 weeks before intravenous inoculation with 10(4) organisms. MAC infections were undetectable in treated animals after 4 months, while control animals had disseminated infections. These findings support the rationale for clinical trials of treatment and prophylaxis with these agents. The cyclosporine-treated rat appears to be a useful model in which to evaluate compounds for the treatment and prophylaxis of disseminated MAC infections.
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Affiliation(s)
- S T Brown
- Infectious Disease Service, Memorial Sloan-Kettering Cancer Center, New York 10021
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11
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Moore DJ, Perrino PJ, Klerer CP, Robertson P. High-performance liquid chromatographic assay for two rifamycin-derived hypocholesterolemic agents in liver and biological fluids. J Chromatogr 1993; 612:310-4. [PMID: 8468390 DOI: 10.1016/0378-4347(93)80178-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
CGP 43371 (compound I), a mono-pivaloyl oxazole derivative of a 3-piperazino-rifamycin, has been in clinical trials as a potential hypocholesterolemic agent. A reversed-phase high-performance liquid chromatographic (HPLC) assay was developed using a C18 column and a gradient solvent system of methanol-0.1 M sodium acetate, pH 4.5, at a flow-rate of 1 ml/min. The compound and internal standard (rifampicin) were detected by their ultraviolet absorption at 254 nm. Isolation of the compounds from plasma and liver homogenates was accomplished by precipitation of proteins with acetonitrile, followed by evaporation under nitrogen and reconstitution in methanol. Bile, lymph and urine were injected onto the HPLC column without pretreatment. Calibration curves were linear (r > 0.999) over the concentration range 0.25-20.0 micrograms/ml. The assay procedure was also applicable to other rifamycin derivatives and was able to distinguish between molecular species containing small differences in functionality.
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Affiliation(s)
- D J Moore
- Preclinical Drug Metabolism, Pharmaceuticals Division, Ciba-Geigy Corporation, Ardsley, NY 10502
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12
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Lewis RC, Hatfield NZ, Narang PK. A sensitive method for quantitation of rifabutin and its desacetyl metabolite in human biological fluids by high-performance liquid chromatography (HPLC). Pharm Res 1991; 8:1434-40. [PMID: 1665904 DOI: 10.1023/a:1015865526655] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Sensitive HPLC-UV methodology has been developed and validated for quantitating rifabutin, an antimycobacterial, and its 25-desacetyl metabolite, LM-565, in human plasma and urine. The HPLC separation for both plasma and urine samples was performed on an ODS, 5-microns, reverse-phase column (25 cm x 4.6-cm ID) using a mobile phase of acetonitrile/0.05 M potassium phosphate, pH 4.2, with triethylamine, (38:61.5:0.5, v/v), at a flow rate of 1.0 ml/min. The separation eluate was monitored by absorbance at 275 nm. Plasma samples (1 ml) were spiked with an internal standard (medazepam), buffered at pH 7.4 and extracted with 80:20 (v/v) hexane:ethyl acetate, and then back extracted with acidified water (0.05 M H3PO4). Linearity was established between 5.0-800 and 2.5-400 ng/ml for rifabutin and LM-565, respectively. Intraday imprecision for rifabutin and LM-565 plasma quality controls prepared at 7.3 and 3.2 ng/ml, respectively, was less than 15% relative standard deviation (RSD). Absolute recovery for parent drug and metabolite, from plasma, was greater than 90% throughout the respective dynamic ranges and greater than 70% for medazepam. Urine samples (1 ml) were acidified with 50 microliters of 3.6 M H2SO4 and diluted with 0.1 M ammonium acetate. Linearity was established between 100 and 5000 ng/ml for both rifabutin and LM-565. Intraday imprecision for a urine control at 200 ng/ml was less than or equal to 12% RSD for either component. The method is currently being used to support Phase I kinetics program for rifabutin in prophylaxis of MAC infection of AIDS patients. Application of this method to a bioavailability assessment is presented.
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Affiliation(s)
- R C Lewis
- Department of Pharmacokinetics/Dynamics, Medical Research Center, Adria Laboratories, Dublin, Ohio 43017
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14
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Abstract
The use of a direct liquid introduction type liquid chromatographic-mass spectrometric interface to study highly thermally labile rifamycin antibiotics is described. Using negative ionization, abundant molecular ions were observed, and the spectra, also contained structurally significant fragments. Variation of the high-performance liquid chromatographic parameters did not change the spectra, thus making it easy to change chromatographic conditions. In quantitative studies, a surprising correlation was found, indicating that the mass spectrometric signal was proportional to the square of the sample concentration.
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Affiliation(s)
- K Vékey
- Lepetit Research Center of the Merrell-Dow Research Institute, Gerenzano, Italy
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Bravo P, Cavalleri B, Zerilli LF, Maccioni AM, Traldi P, Cecchetti W, Polloni R. Laser-induced vaporization mass spectrometry of rifamycins. Biomed Environ Mass Spectrom 1989; 18:301-7. [PMID: 2752184 DOI: 10.1002/bms.1200180504] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The mass spectra of many rifamycins cannot be obtained by electron ionization (EI) owing to their thermal decomposition. When a laser beam is used to vaporize the sample through an optic fibre inserted in a hollow probe which reaches the sample cup, decomposition is minimized and the EI spectra show abundant molecular ions and fragments of structurally high diagnostic value. These ionic species are easily observed owing to the lack of chemical noise often present in soft ionization methods, such as direct liquid chemical ionization and fast atom bombardment.
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Affiliation(s)
- P Bravo
- Dipartimento di Chimica del Politecnico, Piazza L. da Vinci, Milan, Italy
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Biondi PA, Manca F, Negri A, Secchi C, Tedeschi G, Lucarelli C. Improved high-performance liquid chromatographic determination of bacterial collagenase activity in ointments. J Chromatogr A 1988; 459:337-40. [PMID: 2854142 DOI: 10.1016/s0021-9673(01)82045-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- P A Biondi
- Istituto di Fisiologia Veterinaria e Biochimica, Milan, Italy
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17
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Taguchi M, Yamane Y, Aikawa N, Tsukamoto G. 1H- and 13C-nuclear magnetic resonance spectra of rifampicin and 3-[(dimethylhydrazono)methyl]rifamycin SV. Chem Pharm Bull (Tokyo) 1988; 36:4157-61. [PMID: 3245989 DOI: 10.1248/cpb.36.4157] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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18
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Bao GH, He CH, Xu CF, Yao JX, Wang NJ, Mu ST, Zheng QT. Structure determination of kanglemeisu A by X-ray diffraction method. Sci Sin B 1987; 30:1181-9. [PMID: 3452927] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Kanglemeisu A (C50H63O19B.CH3OH) is the product of an actinomyces species from a soil sample gathered in China Kanglemeisu A belongs to the triclinic system, space group P1, unit cell: a = 12.760(3), b = 10.287(2), c = 9.926(2) A, alpha = 88.39(2), beta = 78.64(2), gamma = 89.14(2). RANTAN direct method is used to solve the structure. The final discrepancy factor is R = 0.0689, after atom coordinates and temperature factors have been refined with full matrix least squares. The structure skeleton consists of four parts, the naphthalene nucleus connected to the 5-membered ring, a 17-membered ring connected to C2, a dimethyl butane diacid extended out from C20, beta-D-3,4-OO' methylenedigitoxose passing through an oxygen bridge O6 and linked to C27 of ansa ring.
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Affiliation(s)
- G H Bao
- Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences, Beijing
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19
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Grassini-Strazza G, Nicoletti I, Polcaro CM, Girelli AM, Sanci A. Effect of the mobile phase composition on the retention behaviour of diphenylsilica pre-coated plates. J Chromatogr A 1986; 367:323-34. [PMID: 3023413 DOI: 10.1016/s0021-9673(00)94853-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
The retention of some rifamycins and steroids on diphenyl bonded pre-coated silica gel plates, in relation to the mobile phase used, was examined by thin-layer chromatography. Neat organic solvents, non-aqueous and aqueous binary mixtures were tested as eluents. By comparison of retention data for rifamycins and steroids, respectively, under non-aqueous and aqueous conditions, a dual retention mechanism on this diphenyl phase was found. Interactions with the residual silanol groups seemed to prevail when employing as mobile phase the more lipophilic solvents tested, such as chloroform or dichloromethane, whereas interactions with the aryl groups of the bonded phase prevailed when using high polarity alcohols or aqueous mixtures. As a consequence, by changing the mobile phase, a large variation in selectivity with a concomitant change in retention order of the test compounds was observed.
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Vigevani A, Arlandini E, Ballabio M, Franceschi G, Gioia B, Vioglio S. Physico-chemical properties of FCE 22250, 3-(piperidinomethylazinomethyl)rifamycin SV, a new long-acting rifamycin. Farmaco Prat 1985; 40:131-40. [PMID: 3839192] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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22
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Birlova LV, Popova VB, Zhukovskaia SA. [Stability of rifamycin B in aqueous solutions]. Antibiotiki 1983; 28:514-7. [PMID: 6625547] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Stability of rifamycin B in aqueous solutions at various values of pH and temperature was studied. It was shown that inactivation of the antibiotic in neutral and alkaline solutions proceeded according to the first order equation. In acid solutions rifamycin B was oxidized with air oxygen to form rifamycin O.
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23
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Arora SK. Correlation of structure and activity in ansamycins. Molecular structure of sodium rifamycin SV. Mol Pharmacol 1983; 23:133-40. [PMID: 6865897] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
The crystal and molecular structure of the sodium salt of rifamycin SV (clinically known as rifacin) as the monohydrate ethanol solvate has been determined to study the conformation of the ansa chain in unsubstituted rifamycins and also to clarify the metal complexation with rifamycins. The crystals belong to the space group P2(1)2(1)2(1) with cell dimensions (estimated standard deviations in parentheses) of a = 12.061 (2), b = 13.936 (2), and c = 24.731 (4) A. The structure was solved by direct methods and refined to an R factor of 0.069. The conformation of the ansa chain differs from that of other active rifamycins, e.g., rifampcin and rifamycin B at the joining point of the ansa chain to the naphthohydroquinone chromophore. The conformation of the middle part of the ansa chain, which is essential for activity against DNA-dependent RNA polymerase, remains the same. The sodium ion is penta-coordinated and has a trigonal bipyramidal geometry. The intermolecular hydrogen bonding involves O(9), O(10), O(5), and O(6) through water and ethanol molecules. A two-step mode of action of rifamycins has been postulated, and the conformations of antibiotics suitable for penetration of the membrane barrier and that for antibiotic-enzyme complex formation have been suggested.
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Dzegilenko NB, Korchagin VB, Birlova LV. [Chromatographic control of the process of rifamycin B isolation and purification]. Antibiotiki 1976; 21:115-8. [PMID: 5945] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
A method of chromatography in a thin layer of Silica Cel No. 2 was developed for rifamicin B, rifamicin complex and some admixtures. Extracts of rifamicin B in an organic solvent, aqueous buffer reextracts and dry preparations of rifamicin B were analyzed with the above method. A half-quantitative chromatographic procedure for estimation of the main admixture in dry preparations was proposed.
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Bornschein M, Voigt R. [Aanalysis and stability of rifamycin SV. 1. Analysis]. Pharmazie 1975; 30:527-9. [PMID: 241092] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Ferrari P, Gallo GG. Infrared spectra of rifamycins. Farmaco Sci 1975; 30:676-96. [PMID: 1149878] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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28
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Mezentsev AS. [Rifamycin group antibiotics]. Antibiotiki 1975; 20:560-71. [PMID: 178271] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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29
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Nouws JF. [Distribution of Rifamycin SV in de Bovine Tissues Following Intramammary Administration of Rifamastene (author's transl)]. Tijdschr Diergeneeskd 1975; 100:539-45. [PMID: 1154345] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Depending on the physiological activity of the udder, from 4 to 95 per cent of the rifamycin SV administered by intrammary injection are absorbed from the udder and approximately 95 per cent of the absorbed rifamycin SV are excreted through the liver. The rifamycin SV eliminated in the faeces will lose its microbiological activity more or less rapidly, depending on the temperature and oxygen tension. Accumulation of rifamycin SV in the meat and organs will not occur on intramammary administration of this antibiotic. A balance between absorption and excretion is attained within sixty minutes after intramammary administration of Rifamastene in cattle. The maximum rifamycin SV concentrations determined in the serum, bile and urine were 0.12, 18.2 and 0.32 mug/ml respectively. Van Schothorst's S. lutea kidney test which is required by law in the Netherlands, was negative in every case.
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Unterman HW, Weissbuch S. [Electrochemical methods for determining antibiotics. A review]. Pharmazie 1974; 29:752-6. [PMID: 4617888] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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31
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Buchanan RS, Wanstall RN, Coxhead NL. Treatment of bovine mastitis with rifamycin SV. N Z Vet J 1973; 21:116-22. [PMID: 4516767 DOI: 10.1080/00480169.1973.34089] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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