26
|
Suresh T, Vijayakumar V, Kumar LJ, Sarveswari S, Jotani MM, Otero-de-la-Roza A, Tan YS, Tiekink ER. Hydrogen bonding in 2,6-bis(4-fluorophenyl)-3,5-dimethylpiperidin-4-one methanol solvate. Z KRIST-CRYST MATER 2016. [DOI: 10.1515/zkri-2015-1915] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
The crystal structure analysis of a 2,6-diaryl 4-piperidone derivative, isolated as a mono-methanol solvate, reveals that both the piperidone and the methanol molecule lie on a crystallographic mirror plane. A chair conformation is found for the piperidone ring with the aryl and methyl groups in equatorial positions. The most prominent feature of the molecular packing is the formation of supramolecular zigzag chains mediated by amine-N–H···O(methanol) and hydroxyl-O–H···N(amine) hydrogen bonds, i.e. the methanol molecule serves as a bridge between piperidone molecules. The molecular structure is compared with that determined in an unsolvated form and the gas-phase equilibrium structure, obtained using density-functional theory (DFT); differences relate, in the main, to the relative dispositions of the aryl rings. An analysis of the Hirshfeld surfaces of the experimental structures indicates very similar relative contributions with the notable exception being the contribution by O···H/H···O which at 13.7% in the methanol solvate is >8.5% in the unsolvated form.
Collapse
|
27
|
Kumar L, Kishore V, Yadav G, Raman K, Bhushan M, Suresh T, Kumar P, Suhail M, Pal M. EP-1670: Impact of flatting filter free photon beam on Rapid-arc radiotherapy for gynecological malignancies. Radiother Oncol 2016. [DOI: 10.1016/s0167-8140(16)32921-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
|
28
|
Suresh T, Gao Q, Kim M, Goel S, Gartrell BA. Patient characteristics at time of prostate cancer diagnosis in different races at an academic center serving a diverse population. J Clin Oncol 2016. [DOI: 10.1200/jco.2016.34.2_suppl.158] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
158 Background: In the United States, prostate cancer (PCa) incidence and death rate differ among racial groups. Non-Hispanic Blacks (NHB) have a higher incidence and death rate than non-Hispanic Whites (NHW), whereas incidence and death rate are slightly lower in Hispanics (H) than in NHW. We sought to compare the socioeconomic, demographic and baseline prognostic factors at PCa diagnosis among different races at a large, urban academic center serving a diverse population. Methods: Following institutional review board approval, the Montefiore Medical Center Cancer Registry was used to generate a comprehensive list of patients diagnosed with PCa 2004 to 2013. Clinical Looking Glass (a searchable database of patient information) and individual patient chart review were used to obtain data including age at diagnosis, socioeconomic score (SES), Gleason score, stage at diagnosis and PSA at diagnosis. Patients were classified by self-identified race as H, NHB or NHW. For categorical variables the chi-square test was used, whereas the ANOVA or the Kruskal-Wallis tests were employed for continuous variables. Results: During the specified period 2352 patients were diagnosed with PCa among which 778 were self-classified as H, 1046 as NHB, 486 as NHW and 42 as other (O). The mean age at diagnosis differed between these groups (H 63.2, NHB 63.4, NHW 67, O 63.0, p < 0.0001). The proportion of men below the mean SES also differed between races (H 92.8%, NHB 91.3%, NHW 56.6%, O 75%, p < 0.0001). Median PSA (ng/ml) at diagnosis was similar (H 8.0, NHB 8.4 NHW 7.2, O 6.4, p = 0.0768) whereas Gleason score differed between racial groups (Gleason ≤ 6: H 42.8%, NHB 39.1%, NHW 52.2%, O 50%; Gleason 8-10: H 15.8%, NHB 17.6%, NHW 14.3%, O 16.7%, p = 0.0005). The proportion of men with metastatic disease at diagnosis also differed significantly in these groups (H 7.5%, NHB 9.0%, NHW 4.3%, O 9.5%, p = 0.0139). Conclusions: At our center, in patients with newly diagnosed PCa, there are significant differences among racial groups. These include age at diagnosis, SES, Gleason score and proportion with metastatic disease. Such differences at diagnosis suggest that minority patients are at risk for inferior PCa outcomes.
Collapse
|
29
|
Suresh T, Sarveswari S, Arul murugan N, Vijayakumar V, Iniyavan P, Srikanth A, Jasinski JP. Synthesis, spectral characterization and DFT analysis for the validation of 2, 6 diaryl -piperidin-4-ones as potential sunscreens and UV filters. J Mol Struct 2015. [DOI: 10.1016/j.molstruc.2015.07.011] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
30
|
Suresh T, Gao Q, Goel S, Gartrell BA. Prognostic factors at diagnosis of prostate cancer by race and ethnicity at a large academic center. J Clin Oncol 2015. [DOI: 10.1200/jco.2015.33.15_suppl.e16104] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
|
31
|
Kumar CHP, Ganesh K, Suresh T, Sharma A, Bhanuprakash K, Sharma GD, Chandrasekharam M. Influence of thermal and solvent annealing on the morphology and photovoltaic performance of solution processed, D–A–D type small molecule-based bulk heterojunction solar cells. RSC Adv 2015. [DOI: 10.1039/c5ra16812k] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Four new small molecules CSDPP9–CSDPP12 were obtained with appended electron donating units in the molecular terminals of a DPP core. On solvent and thermal annealing, for the CSDPP11:PC71BM blend, the BHJ device displayed a PCE of 5.47%.
Collapse
|
32
|
Suresh T, Lee LX, Joshi J, Barta SK. New antibody approaches to lymphoma therapy. J Hematol Oncol 2014; 7:58. [PMID: 25355407 PMCID: PMC4172963 DOI: 10.1186/s13045-014-0058-4] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2014] [Accepted: 07/29/2014] [Indexed: 01/01/2023] Open
Abstract
The CD20-directed monoclonal antibody rituximab established a new era in lymphoma therapy. Since then other epitopes on the lymphoma surface have been identified as potential targets for monoclonal antibodies (mAb). While most mAbs eliminate lymphoma cells mainly by antibody-dependent cellular cytotoxicity, complement-dependent cytotoxicity or direct cell death, others counter mechanisms utilized by malignant cells to evade immune surveillance. Expression of PD-L1 on malignant or stromal cells in the tumor environment for example leads to T-cell anergy. Targeting either PD-1 or PD-L1 via mAbs can indirectly eliminate cancer cells by unblocking the host intrinsic immune response. Yet another mechanism of targeted therapy with mAbs are bi-specific T-cell engagers (BiTE) such as blinatumomab, which directly engages the host immune cells. These examples highlight the broad spectrum of available therapies targeting the lymphoma surface with mAbs utilizing both passive and active immune pathways. Many of these agents have already demonstrated significant activity in clinical trials. In this review we will focus on novel CD20-directed antibodies as well as mAbs directed against newer targets like CD19, CD22, CD40, CD52 and CCR4. In addition we will review mAbs unblocking immune checkpoints and the BiTE blinatumomab. Given the success of mAbs and the expansion in active and passive immunotherapies, these agents will play an increasing role in the treatment of lymphomas.
Collapse
|
33
|
Tholkapiyan M, Shanmugam P, Suresh T. Monitoring of ocean surface algal blooms in coastal and oceanic waters around India. ENVIRONMENTAL MONITORING AND ASSESSMENT 2014; 186:4129-4137. [PMID: 24554022 DOI: 10.1007/s10661-014-3685-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2013] [Accepted: 01/20/2014] [Indexed: 06/03/2023]
Abstract
The National Aeronautics and Space Administration's (NASA) sensor MODIS-Aqua provides an important tool for reliable observations of the changing ocean surface algal bloom paradigms in coastal and oceanic waters around India. A time series of the MODIS-Aqua-derived OSABI (ocean surface algal bloom index) and its seasonal composite images report new information and comprehensive pictures of these blooms and their evolution stages in a wide variety of events occurred at different times of the years from 2003 to 2011, providing the first large area survey of such phenomena around India. For most of the years, the results show a strong seasonal pattern of surface algal blooms elucidated by certain physical and meteorological conditions. The extent of these blooms reaches a maximum in winter (November-February) and a minimum in summer (June-September), especially in the northern Arabian Sea. Their spatial distribution and retention period are also significantly increased in the recent years. The increased spatial distribution and intensity of these blooms in the northern Arabian Sea in winter are likely caused by enhanced cooling, increased convective mixing, favorable winds, and atmospheric deposition of the mineral aerosols (from surrounding deserts) of the post-southwest monsoon period. The southward Oman coastal current and southwestward winds become apparently responsible for their extension up to the central Arabian Sea. Strong upwelling along this coast further triggers their initiation and growth. Though there is a warming condition associated with increased sea surface height anomalies along the coasts of India and Sri Lanka in winter, surface algal bloom patches are still persistent along these coasts due to northeast monsoonal winds, enhanced precipitation, and subsequent nutrient enrichment in these areas. The occurrence of the surface algal blooms in the northern Bay of Bengal coincides with a region of the well-known Ganges-Brahmaputra Estuarine Frontal (GBEF) system, which increases supply of nutrients in addition to the land-derived inputs triggering surface algal blooms in this region. Low density (initiation stage) of such blooms observed in clear oceanic waters southeast and northeast of Sri Lanka may be caused by the vertical mixing processes (strong monsoonal winds) and the occurrence of Indian Ocean Dipole events. Findings based on the analyses of time series satellite data indicate that the new information on surface algal blooms will have important bearing on regional fisheries, ecosystem and environmental studies, and implications of climate change scenarios.
Collapse
|
34
|
Bissonette GB, Bae MH, Suresh T, Jaffe DE, Powell EM. Prefrontal cognitive deficits in mice with altered cerebral cortical GABAergic interneurons. Behav Brain Res 2013; 259:143-51. [PMID: 24211452 DOI: 10.1016/j.bbr.2013.10.051] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2013] [Revised: 10/25/2013] [Accepted: 10/30/2013] [Indexed: 12/26/2022]
Abstract
Alterations of inhibitory GABAergic neurons are implicated in multiple psychiatric and neurological disorders, including schizophrenia, autism and epilepsy. In particular, interneuron deficits in prefrontal areas, along with presumed decreased inhibition, have been reported in several human patients. The majority of forebrain GABAergic interneurons arise from a single subcortical source before migrating to their final regional destination. Factors that govern the interneuron populations have been identified, demonstrating that a single gene mutation may globally affect forebrain structures or a single area. In particular, mice lacking the urokinase plasminogen activator receptor (Plaur) gene have decreased GABAergic interneurons in frontal and parietal, but not caudal, cortical regions. Plaur assists in the activation of hepatocyte growth factor/scatter factor (HGF/SF), and several of the interneuron deficits are correlated with decreased levels of HGF/SF. In some cortical regions, the interneuron deficit can be remediated by endogenous overexpression of HGF/SF. In this study, we demonstrate decreased parvalbumin-expressing interneurons in the medial frontal cortex, but not in the hippocampus or basal lateral amygdala in the Plaur null mouse. The Plaur null mouse demonstrates impaired medial frontal cortical function in extinction of cued fear conditioning and the inability to form attentional sets. Endogenous HGF/SF overexpression increased the number of PV-expressing cells in medial frontal cortical areas to levels greater than found in wildtype mice, but did not remediate the behavioral deficits. These data suggest that proper medial frontal cortical function is dependent upon optimum levels of inhibition and that a deficit or excess of interneuron numbers impairs normal cognition.
Collapse
|
35
|
Chandrasekharam M, Suresh T, Singh SP, Priyanka B, Bhanuprakash K, Islam A, Han L, Lakshmi Kantam M. Functionalized styryl bipyridine as a superior chelate for a ruthenium sensitizer in dye sensitized solar cells. Dalton Trans 2012; 41:8770-2. [DOI: 10.1039/c2dt30688c] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
36
|
Suresh T, Hatha A, Harsha H, Lakshmanaperumalsamy P. Prevalence and distribution of Salmonella serotypes in marketed broiler chickens and processing environment in Coimbatore City of southern India. Food Res Int 2011. [DOI: 10.1016/j.foodres.2011.01.035] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
37
|
Jooste EH, Muhly WT, Ibinson JW, Suresh T, Damian D, Phadke A, Callahan P, Miller S, Feingold B, Lichtenstein SE, Cain JG, Chrysostomou C, Davis PJ. Acute hemodynamic changes after rapid intravenous bolus dosing of dexmedetomidine in pediatric heart transplant patients undergoing routine cardiac catheterization. Anesth Analg 2010; 111:1490-6. [PMID: 21059743 DOI: 10.1213/ane.0b013e3181f7e2ab] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
BACKGROUND Dexmedetomidine is a highly selective α(2)-adrenoceptor agonist with sedative, anxiolytic, and analgesic properties that has minimal effects on respiratory drive. Its sedative and hypotensive effects are mediated via central α(2A) and imidazoline type 1 receptors while activation of peripheral α(2B)-adrenoceptors result in an increase in arterial blood pressure and systemic vascular resistance. In this randomized, prospective, clinical study, we attempted to quantify the short-term hemodynamic effects resulting from a rapid i.v. bolus administration of dexmedetomidine in pediatric cardiac transplant patients. METHODS Twelve patients, aged 10 years or younger, weighing ≤40 kg, presenting for routine surveillance of right and left heart cardiac catheterization after cardiac transplantation were enrolled. After an inhaled or i.v. induction, the tracheas were intubated and anesthesia was maintained with 1 minimum alveolar concentration of isoflurane in room air, fentanyl (1 μg/kg), and rocuronium (1 mg/kg). At the completion of the planned cardiac catheterization, 100% oxygen was administered. After recording a set of baseline values that included heart rate (HR), systolic blood pressure, diastolic blood pressure, central venous pressure, systolic pulmonary artery pressure, diastolic pulmonary artery pressure, pulmonary artery wedge pressure, and thermodilution-based cardiac output, a rapid i.v. dexmedetomidine bolus of either 0.25 or 0.5 μg/kg was administered over 5 seconds. The hemodynamic measurements were repeated at 1 minute and 5 minutes. RESULTS There were 6 patients in each group. Investigation suggested that systolic blood pressure, diastolic blood pressure, systolic pulmonary artery pressure, diastolic pulmonary artery pressure, pulmonary artery wedge pressure, and systemic vascular resistance all increased at 1 minute after rapid i.v. bolus for both doses and decreased significantly to near baseline for both doses by 5 minutes. The transient increase in pressures was more pronounced in the systemic system than in the pulmonary system. In the systemic system, there was a larger percent increase in the diastolic pressures than the systolic pressures. Cardiac output, central venous pressure, and pulmonary vascular resistance did not change significantly. HR decreased at 1 minute for both doses and was, within the 0.5 μg/kg group, the only hemodynamic variable still changed from baseline at the 5-minute time point. CONCLUSION Rapid i.v. bolus administration of dexmedetomidine in this small sample of children having undergone heart transplants was clinically well tolerated, although it resulted in a transient but significant increase in systemic and pulmonary pressure and a decrease in HR. In the systemic system, there is a larger percent increase in the diastolic pressures than the systolic pressures and, furthermore, these transient increases in pressures were more pronounced in the systemic system than in the pulmonary system.
Collapse
|
38
|
Murthy SC, Siddalingappa K, Suresh T. Nicolau's syndrome following diclofenac administration: A report of two cases. Indian J Dermatol Venereol Leprol 2008; 73:429-31. [PMID: 18032871 DOI: 10.4103/0378-6323.37070] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
|
39
|
Nandhakumar R, Suresh T, Jude ALC, Rajesh Kannan V, Mohan PS. Synthesis, antimicrobial activities and cytogenetic studies of newer diazepino quinoline derivatives via Vilsmeier–Haack reaction. Eur J Med Chem 2007; 42:1128-36. [PMID: 17331623 DOI: 10.1016/j.ejmech.2007.01.004] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2006] [Revised: 12/26/2006] [Accepted: 01/02/2007] [Indexed: 10/23/2022]
Abstract
The study of the Vilsmeier-Haack reagent on 4-hydroxyquinaldines resulted in a new versatile intermediate 4-chloro-3-formyl-2-(2-hydroxy-ethene-1-yl)quinolines, which on further treatment with hydrazine hydrate yielded the desired diazepino quinoline derivatives. All the synthesized diazepino quinoline derivatives are screened for their antibacterial and antifungal activities. Cytogenetic analysis of the samples is also reported.
Collapse
|
40
|
Latha M, Ramkumar KM, Pari L, Damodaran PN, Rajeshkannan V, Suresh T. Phytochemical and antimicrobial study of an antidiabetic plant: Scoparia dulcis L. J Med Food 2006; 9:391-4. [PMID: 17004904 DOI: 10.1089/jmf.2006.9.391] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
The antimicrobial and antifungal effects of different concentrations of chloroform/methanol fractions of Scoparia dulcis were investigated. The isolated fractions were tested against different bacteria like Salmonella typhii, Staphylococcus aureus, Escherichia coli, Bacillus subtilis, Pseudomonas aeruginosa, and Proteus vulgaris and fungal strains such as Alternaria macrospora, Candida albicans, Aspergillus niger, and Fusarium oxysporum. The isolated fractions exhibited significant antimicrobial and antifungal activity against all the tested organisms compared with respective reference drugs. The isolated fractions of S. dulcis showed properties like antimicrobial and antifungal activities that will enable researchers in turn to look for application-oriented principles.
Collapse
|
41
|
Suresh T, Hatha AAM, Sreenivasan D, Sangeetha N, Lashmanaperumalsamy P. Prevalence and antimicrobial resistance of Salmonella enteritidis and other salmonellas in the eggs and egg-storing trays from retail markets of Coimbatore, South India. Food Microbiol 2005; 23:294-9. [PMID: 16943017 DOI: 10.1016/j.fm.2005.04.001] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2004] [Revised: 04/08/2005] [Accepted: 04/08/2005] [Indexed: 11/20/2022]
Abstract
A study was conducted to determine the incidence of Salmonella enterica serovar Enteritidis and other Salmonella serovars on eggshell, egg contents and on egg-storing trays. A total of 492 eggs and 82 egg-storing trays were examined over a period of 1 year from different retail outlets of a residential area of Coimbatore city, South India. Salmonella contamination was recorded in 38 of 492 (7.7%) eggs out of which 29 was in eggshell (5.9%) and 9 in egg contents (1.8%). Around 7.5% of the egg-storing trays were also found to be contaminated with Salmonella. Serotyping of the Salmonella strains showed that 89.7% of the strains from eggshell, 100% of the strains from egg contents and 71.4% of the strains from egg-storing trays were Salmonella Enteritidis. Other serovarvars encountered were S. Cerro, S. Molade and S. Mbandaka from eggshell and S. Cerro from egg-storing trays. Seasonal variations in the prevalence pattern were identified with, a higher prevalence during monsoon months followed by post-monsoon and premonsoon. Further examination of the Salmonella strains was carried out by testing their antimicrobial sensitivity against 10 commonly used antimicrobials. Results revealed high prevalence of multiple antimicrobial resistance among these strains suggesting possible prior selection by use of antimicrobials in egg production.
Collapse
|
42
|
Suresh T, Dhanabal T, Nandha Kumar R, Mohan PS. Synthesis of Pyranoquinoline alkaloids via (4+2) cycloaddition reaction. HETEROCYCL COMMUN 2005. [DOI: 10.1515/hc.2005.11.1.79] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
|
43
|
Kumar PR, Raju S, Goud PS, Sailaja M, Sarma MR, Reddy GO, Kumar MP, Reddy VVRMK, Suresh T, Hegde P. Synthesis and biological evaluation of thiophene [3,2- b ] pyrrole derivatives as potential anti-inflammatory agents. Bioorg Med Chem 2004; 12:1221-30. [PMID: 14980634 DOI: 10.1016/j.bmc.2003.11.003] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2003] [Accepted: 11/04/2003] [Indexed: 12/01/2022]
Abstract
A series of thiophene [3,2-b] pyrrole derivatives were synthesized and evaluated their abilities to inhibit anti-inflammatory activity. In this series, substituent effects at the N-1, 2 and 5 positions of thiophene [3,2-b] pyrrole were examined. The results obtained are compared to those previously reported anti-inflammatory drugs like Tenidap sodium, Diclofenac sodium and Piroxicam. The results indicated the critical role of the group linked in the N-1 position and 2, 5 positions of thiophene [3,2-b] pyrrole with different functional groups.
Collapse
|
44
|
Suresh T, Ramana DV, Gopinath, Kumar RV, Rajagopal P. Modified Ultra filtration: Using dialyser in high risk adult open heart operations. Indian J Thorac Cardiovasc Surg 2004. [DOI: 10.1007/s12055-004-0434-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
|
45
|
Narayana CL, Suresh T, Rao SM, Dubey PK, Babu JM. A validated chiral HPLC method for the enantiomeric separation of Linezolid on amylose based stationary phase. J Pharm Biomed Anal 2003; 32:21-8. [PMID: 12852445 DOI: 10.1016/s0731-7085(03)00031-1] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Two chiral HPLC methods namely method A and method B were developed for the separation of enantiomers of Linezolid. The mobile phases containing hexane, 2-propanol and trifluoro acetic acid (TFA) in the ratio (80:20:0.1, v/v/ v); hexane, ethanol and TFA in the ratio (65:35:0.1, v/v/v) were used in method A and method B, respectively. The assay results of the two methods were checked in terms of F-test variance ratio and found to be less than the table value, confirming their good precision. The enantiomeric separation of Linezolid on different chiral stationary phases was investigated. The two enantiomers of Linezoild were well resolved on a Chiralpak AD, an amylose based stationary phase. Preparative chiral HPLC was carried out to obtain pure (+) enantiomer of Linezolid from its racemate. The method A was extensively validated and found to be robust. The chiral assay of Linezolid in bulk and pharmaceutical formulations (tablet) were found to be 100.4 +/- 0.4 and 101.2 +/- 1.4%, respectively at 95% confidence interval. The percentage recovery of (+) enantiomer (chiral impurity) was found to be 99.2 +/- 1.9 at 95% confidence interval. The limit of detection and limit of quantification of (+) enantiomer were found to be 123 and 374 ng/ml, respectively for 10 microl injection volume.
Collapse
|
46
|
Suresh T, Nandha kumar R, Mohan PS. A Facile approach to dibenzo [bf| [1,6] naphthyridines using Vilsmeier Conditions. HETEROCYCL COMMUN 2003. [DOI: 10.1515/hc.2003.9.1.83] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
|
47
|
Suresh T, Nandha kumar R, Mohan PS. Synthesis and Antibacterial Activities of 1,2,3,4,6,7,8,9-octahydro-1,3,7,9-tetraphenyl 5-pyrrolo-2,4,6,8-tetraoxo-10H, 5H pyrido[2,3-d; 6,5-d']dipyrimidine. HETEROCYCL COMMUN 2003. [DOI: 10.1515/hc.2003.9.2.203] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
|
48
|
Nandha Kumar R, Vishwanathan H, Suresh T, Mohan PS. Antibacterial activity of Mappia foetida leaves and stem. Fitoterapia 2002; 73:734-6. [PMID: 12490245 DOI: 10.1016/s0367-326x(02)00215-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Successive petroleum ether, chloroform and methanol extracts of Mappia foetida leaves and stem were tested for their antibacterial activity. The methanol fractions were found to be most effective against all the tested organisms.
Collapse
|
49
|
Krishna Reddy KVSR, Mahender Rao S, Om Reddy G, Suresh T, Moses Babu J, Dubey PK, Vyas K. Isolation and characterization of process-related impurities in linezolid. J Pharm Biomed Anal 2002; 30:635-42. [PMID: 12367688 DOI: 10.1016/s0731-7085(02)00353-9] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Two unknown impurities in linezolid bulk drug at levels below 0.1% (ranging from 0.05 to 0.1%) were detected by a simple isocratic reverse phase high performance liquid chromatography (HPLC). These impurities were isolated from crude sample of linezolid using reverse phase preparative HPLC. Based on the spectroscopic data (IR, NMR and MS) the structures of the impurities were characterized as (S)-N-[[-(3-(3-fluoro-4-(4-morpholinyl)phenyl]-2-oxo-5-oxazolidinyl]methyl] acetate(I) and (S)-N-[[-(3-(3-fluoro-4-(4-morpholinyl)phenyl]-2-oxo-5-oxazolidinyl]methyl] chloride(II). The synthesis from an unambiguous route and the formation of impurities was discussed.
Collapse
|
50
|
Raghu TY, Venkatesulu GA, Kantharaj GR, Suresh T, Veeresh V, Hanumanthappa Y. Progeria (Hutchison-Gilford syndrome) in siblings: in an autosomal recessive pattern of inheritance. Indian J Dermatol Venereol Leprol 2001; 67:261-2. [PMID: 17664768] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
Progeria is an autosomal dominant, premature aging syndrome. Six and three year old female siblings had sclerodermatous changes over the extremities, alopecia, beaked nose, prominent veins and bird-like facies. Radiological features were consistent with features of progeria. The present case highlights rarity of progeria in siblings with a possible autosomal recessive pattern.
Collapse
|