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Nath P, Bharty MK, Maiti B, Bharti A, Butcher RJ, Wikaira JL, Singh NK. Ag(i), Cu(ii), Co(iii) and Hg(ii) complexes and metal-assisted products derived from 4-methyl-piperidine-carbodithioate: syntheses, structures, thermal analyses, redox behaviour and fluorescence properties. RSC Adv 2016. [DOI: 10.1039/c6ra15186h] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Ag(i), Cu(ii), Co(iii) and Hg(ii) complexes and metal-assisted products derived from 4-methyl piperidine have been synthesized. The Cu(ii) complex is redox reversible and compounds3and5are fluorescent.
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Maiti B, Maiti S, De P. Self-assembly of well-defined fatty acid based amphiphilic thermoresponsive random copolymers. RSC Adv 2016. [DOI: 10.1039/c6ra00336b] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Side-chain stearic acid containing thermoresponsive and crystalline random copolymers are synthesized via RAFT technique, which self-assembled to spherical micellar structures in aqueous solution depending on stearate content in the copolymer.
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Kumar S, Maiti B, De P. Carbohydrate-Conjugated Amino Acid-Based Fluorescent Block Copolymers: Their Self-Assembly, pH Responsiveness, and/or Lectin Recognition. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:9422-9431. [PMID: 26259117 DOI: 10.1021/acs.langmuir.5b02245] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
An effective strategy has been documented to combine both carbohydrate and amino acid biomolecules in a single synthetic polymeric system via a reversible addition-fragmentation chain transfer (RAFT) polymerization technique. The resultant unique block copolymer was engineered to form uniform micelles with the desired projection of either selective or both amino acid/sugar residues on the outer surface with multivalency, providing pH-based stimuli-responsiveness and/or lectin recognition. The self-assembly process was studied in detail by field emission scanning electron microscopy (FE-SEM), dynamic light scattering (DLS), and UV-visible spectroscopy. The enhanced lectin binding behavior was observed for glyconanoparticles with both amino acid/sugar entities on the shell as compared to the only glycopolymer nanoparticle because of the higher steric hindrance factor in the case of only the glycopolymer nanoparticle. Fluorophore conjugation by postpolymerization functionalization was further exploited by fluorescence spectroscopy for evidencing the lectin recognition process.
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Narayanan A, Maiti B, De P. Exploring the post-polymerization modification of side-chain amino acid containing polymers via Michael addition reactions. REACT FUNCT POLYM 2015. [DOI: 10.1016/j.reactfunctpolym.2015.04.001] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Haldar U, Nandi M, Maiti B, De P. POSS-induced enhancement of mechanical strength in RAFT-made thermoresponsive hydrogels. Polym Chem 2015. [DOI: 10.1039/c5py00664c] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this study, covalently cross-linked thermoresponsive hydrogels were prepared with higher mechanical stability by the introduction of polyhedral oligomeric silsesquioxane (POSS) moieties.
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Abstract
Side-chain l-methionine containing polymers show the ability to donate a methyl group in the absence of a methyltransferase enzyme, which confirms their enzyme-like activity.
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Shetty M, Maiti B, Venugopal MN, Karunasagar I, Karunasagar I. First isolation and characterization of Edwardsiella tarda from diseased striped catfish, Pangasianodon hypophthalmus (Sauvage). JOURNAL OF FISH DISEASES 2014; 37:265-271. [PMID: 24344765 DOI: 10.1111/jfd.12039] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2011] [Revised: 03/10/2012] [Accepted: 03/11/2012] [Indexed: 06/03/2023]
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Maiti B, Kumar S, De P. Controlled RAFT synthesis of side-chain oleic acid containing polymers and their post-polymerization functionalization. RSC Adv 2014. [DOI: 10.1039/c4ra08872g] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
We report the synthesis and characterization of well-defined polymers from oleic acid as the bio-renewable resource. Double bonds in oleate side-chains in the polymer are further modified by thiol-ene reaction, epoxidation, and cross-linking.
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Maiti B, De P. RAFT polymerization of fatty acid containing monomers: controlled synthesis of polymers from renewable resources. RSC Adv 2013. [DOI: 10.1039/c3ra45541f] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Ghosh S, Pratihar D, Maiti B, Das P. Identification of flow regimes using conductivity probe signals and neural networks for counter-current gas–liquid two-phase flow. Chem Eng Sci 2012. [DOI: 10.1016/j.ces.2012.08.042] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Maiti B, Kundranda MN, Spiro TP, Daw HA. The association of metabolic syndrome with triple-negative breast cancer. Breast Cancer Res Treat 2009; 121:479-83. [PMID: 19851862 DOI: 10.1007/s10549-009-0591-y] [Citation(s) in RCA: 103] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2009] [Accepted: 10/08/2009] [Indexed: 01/15/2023]
Abstract
Metabolic syndrome, a conglomerate of obesity, insulin resistance, dyslipidemia, and hypertension has been linked with an increased risk of breast cancer. We investigated the possible association of highly aggressive triple-negative breast cancer and the metabolic syndrome. Information on metabolic syndrome components and tumor characteristics were reviewed in a cohort of 176 patients (including 86 triple-negatives). Retrospective comparison was performed using Pearson Chi-square test or Student's t test for data analysis. A statistically significant association of triple-negative breast cancer with the metabolic syndrome was observed. In accordance with the NCEP (National Cholesterol Education Program) definition, 58.1% of triple-negative patients had metabolic syndrome compared to only 36.7% of non-triple-negative patients (P = 0.004). Consistently, by the AACE (American Association of Clinical Endocrinologists) criteria, 52.3% of triple-negative patients had metabolic syndrome as compared to 34.4% of non-triple-negative patients (P = 0.017). Blood glucose, triglyceride, and HDL levels but not hypertension or BMI (body mass index) showed significant independent association with triple-negative breast cancer. Additionally, triple-negative tumors displayed a significantly higher histological grade and relative paucity of ductal carcinoma in situ (DCIS) when compared to the non-triple-negative tumors (P < 0.001). Our study suggests that metabolic syndrome is significantly more prevalent in triple-negative breast cancer patients as opposed to non-triple-negative patients. Furthermore, triple-negative breast cancer showed a significantly higher histological grade and a relative absence of DCIS. Whether the presence of metabolic syndrome preferentially increases the risk of developing triple-negative-breast cancer remains to be elucidated with future prospective studies.
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Maiti B, Kundranda MN, Jin T, Spiro TP, Daw HA. The association of metabolic syndrome with triple-negative breast cancer. J Clin Oncol 2009. [DOI: 10.1200/jco.2009.27.15_suppl.1038] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
1038 Background: Metabolic syndrome, a conglomerate of obesity, insulin resistance, hypertriglyceridemia, low HDL (high density lipoprotein), and hypertension is associated with an increased risk of breast cancer. However, no clear association has been shown between the highly aggressive triple-negative breast cancer and metabolic syndrome. Methods: In a retrospective review we compared triple-negative and non-triple-negative breast cancer cases for the presence of metabolic syndrome by NCEP (National Cholesterol Education Program) or AACE (American Association of Clinical Endocrinologists) definitions. Data on metabolic syndrome criteria, tumor size, grade, lymph node status, and ductal carcinoma in situ (DCIS) were reviewed. Chi-square test or Student's t-test was used for data analysis. Results: The entire cohort of 176 patients (12.5% African-American) with median age 56.5 years (range 26–91 years) comprised of 86 triple-negative cases and 90 non-triple-negative cases. A statistically significant association of triple-negative breast cancer with metabolic syndrome was observed. According to the NCEP criteria 58.1% of triple negative patients had metabolic syndrome as compared to only 36.7% of non-triple negative patients (p = 0.004). Consistently, by the AACE criteria 52.3% of triple negative patients had metabolic syndrome as compared to 34.4% of non-triple negative patients (p = 0.017). Contrary to blood glucose, triglyceride, or HDL levels, which independently showed significant association with triple-negative breast cancer, hypertension, or BMI showed no independent association. Additionally, triple-negative tumors displayed a significantly higher histologic grade and relative paucity of ductal carcinoma in situ (DCIS) when compared to the non-triple negative tumors (p < 0.001). Conclusions: The data suggests that the metabolic syndrome is significantly more prevalent in triple-negative breast cancer patients when compared to the non-triple-negative patients. Additionally, triple-negative breast cancer showed a significantly higher histologic grade and a relative absence of DCIS. Whether the presence of metabolic syndrome preferentially increases the risk of developing triple-negative-breast cancer needs to be elucidated by future prospective studies. No significant financial relationships to disclose.
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Maiti B, Raghunath P, Karunasagar I, Karunasagar I. Cloning and expression of an outer membrane protein OmpW of Aeromonas hydrophila and study of its distribution in Aeromonas spp. J Appl Microbiol 2009; 107:1157-67. [PMID: 19426281 DOI: 10.1111/j.1365-2672.2009.04296.x] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
AIMS The main aims of this study were to clone and express an outer membrane protein (OMP), OmpW, of Aeromonas hydrophila and to study its distribution in Aeromonas spp. METHODS AND RESULTS The gene encoding OmpW in A. hydrophila has been cloned and expressed in Escherichia coli. Primers were designed for amplification of full-length ompW gene and used for identification of this gene in different Aeromonas spp. Of the 42 Aeromonas strains tested, all the isolates were positive by polymerase chain reaction (PCR) except one strain of Aeromonas veronii biovar veronii (VTE338). None of the other gram-negative bacteria were positive by PCR with primers specific to ompW gene of A. hydrophila. Polyclonal antibodies were raised in rabbit against the purified recombinant protein and the reaction of these antibodies was confirmed by western blotting using the purified recombinant protein and 42 Aeromonas cultures grown at various salt concentrations. CONCLUSIONS The ompW-based PCR method developed in this study was found to be 100% specific and 97% sensitive. Expression of OmpW protein of Aeromonas was found to be salt-dependant. Recombinant OmpW protein was found to be highly immunogenic in fish. SIGNIFICANCE AND IMPACT OF THE STUDY To our knowledge, this is the first report on cloning and expression of OmpW protein of A. hydrophila. Full-length ompW gene amplification by PCR can be used for the detection of Aeromonas. Recombinant OmpW protein can be useful for vaccination of fish against Aeromonas spp.
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Schessl J, Zou Y, McGrath MJ, Cowling BS, Maiti B, Chin SS, Sewry C, Battini R, Hu Y, Cottle DL, Rosenblatt M, Spruce L, Ganguly A, Kirschner J, Judkins AR, Golden JA, Goebel HH, Taratuto AL, Muntoni F, Flanigan KM, Mitchell CA, Bönnemann CG. Proteomic identification of the LIM domain protein FHL1 as the gene-product mutated in reducing body myopathy. KLIN NEUROPHYSIOL 2009. [DOI: 10.1055/s-0029-1216187] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Maiti B, Ferreiro A, Richard P, Flanigan K, Howard M. C.P.2.09 Patient missense mutations near the SEPN1 UGA-SEC codon can alter selenocysteine incorporation. Neuromuscul Disord 2007. [DOI: 10.1016/j.nmd.2007.06.285] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Maiti B, Howard M, Flanigan K. G.P.3.08 Missense mutations in the dystrophin ZZ domain: Effects beyond beta dystroglycan binding? Neuromuscul Disord 2007. [DOI: 10.1016/j.nmd.2007.06.083] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Swami SB, Das S, Maiti B. Convective hot air drying and quality characteristics of bori: A traditional Indian nugget prepared from black gram pulse batter. J FOOD ENG 2007. [DOI: 10.1016/j.jfoodeng.2006.01.064] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Swami SB, Maiti B, Das S. Development of an extrusion system for Bori and force characteristics of its batter during extrusion. J FOOD ENG 2006. [DOI: 10.1016/j.jfoodeng.2005.01.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Roy DR, Parthasarathi R, Maiti B, Subramanian V, Chattaraj PK. Electrophilicity as a possible descriptor for toxicity prediction. Bioorg Med Chem 2005; 13:3405-12. [PMID: 15848752 DOI: 10.1016/j.bmc.2005.03.011] [Citation(s) in RCA: 126] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2005] [Revised: 03/02/2005] [Accepted: 03/02/2005] [Indexed: 11/18/2022]
Abstract
Electrophilicity is one of the cardinal chemical reactivity descriptors successfully employed in various molecular reactivity studies within a structure-activity relationship parlance. The applications of this quantity in the modeling of toxicological properties have inspired us to perform a more exhaustive study in order to test and/or to validate the application of electrophilicity in assessing its chemical and toxicological potential. For this reason the toxicity of a large data set of molecules comprising 252 aliphatic compounds on the Tetrahymena pyriformis is studied. A quantitative structure-activity relationship analysis enabled us to model toxicity in terms of global and local electrophilicities, which provide a reasonably good prediction of aliphatic toxicity. It is heartening to note that the global and local electrophilicity values together can explain the toxicity of a large variety of aliphatic compounds nicely without resorting to any other descriptor or other microscopic/macroscopic physicochemical properties as is the situation in all other QSAR studies.
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Baslingappa Swami S, Das S, Maiti B. Moisture sorption isotherms of black gram nuggets (bori) at varied temperatures. J FOOD ENG 2005. [DOI: 10.1016/j.jfoodeng.2004.05.014] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Ramkumar J, Maiti B. Transport of Molybdenum Across a Bulk Liquid Membrane Using 8‐Hydroxy Quinoline as a Carrier. SEP SCI TECHNOL 2005. [DOI: 10.1081/ss-120027568] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Venkatesh K, Maiti B. Preconcentration and Separation of Uranium from Thorium by Solid Phase Extraction with XAD‐4 Modified with Organic Reagents. SEP SCI TECHNOL 2005. [DOI: 10.1081/ss-120030784] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Kumar SD, Tripathi VS, Shenoy N, Maiti B. Chloride analysis in magnesium metal using ion chromatography with conductometric detection. J Chromatogr A 2004; 1046:155-8. [PMID: 15387184 DOI: 10.1016/j.chroma.2004.06.049] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/30/2023]
Abstract
A simple, rapid and accurate method for the determination of chloride in magnesium metal has been developed. The quantitative determination of chloride was accomplished by anion exchange chromatography with conductometric determination. A Metrosep Anion Dual 2 analytical column connected in series with a Metrosep RP guard column was used for chloride separation. A solution containing a mixture of 1.3 mM Na2CO3 and 2 mM NaHCO3 was used as eluent. The method requires a sample dissolution using nitric acid. The limit of detection for the determination of chloride is 50 mg kg(-1) and the relative standard deviation was 5% for the overall method. The recovery of chloride added was 99-102%. No interference was observed from either the closely eluting "system peak" or the nitrate peak in the determination of chloride.
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Braunstein M, Adler-Golden S, Maiti B, Schatz GC. Quantum and classical studies of the O(3P)+H2(v=0–3,j=0)→OH+H reaction using benchmark potential surfaces. J Chem Phys 2004; 120:4316-23. [PMID: 15268601 DOI: 10.1063/1.1642580] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We present results of time-dependent quantum mechanics (TDQM) and quasiclassical trajectory (QCT) studies of the excitation function for O(3P) + H2(v = 0-3,j = 0) --> OH + H from threshold to 30 kcal/mol collision energy using benchmark potential energy surfaces [Rogers et al., J. Phys. Chem. A 104, 2308 (2000)]. For H2(v = 0) there is excellent agreement between quantum and classical results. The TDQM results show that the reactive threshold drops from 10 kcal/mol for v = 0 to 6 for v = 1, 5 for v = 2 and 4 for v = 3, suggesting a much slower increase in rate constant with vibrational excitation above v = 1 than below. For H2(v > 0), the classical results are larger than the quantum results by a factor approximately 2 near threshold, but the agreement monotonically improves until they are within approximately 10% near 30 kcal/mol collision energy. We believe these differences arise from stronger vibrational adiabaticity in the quantum dynamics, an effect examined before for this system at lower energies. We have also computed QCT OH(v',j') state-resolved cross sections and angular distributions. The QCT state-resolved OH(v') cross sections peak at the same vibrational quantum number as the H2 reagent. The OH rotational distributions are also quite hot and tend to cluster around high rotational quantum numbers. However, the dynamics seem to dictate a cutoff in the energy going into OH rotation indicating an angular momentum constraint. The state-resolved OH distributions were fit to probability functions based on conventional information theory extended to include an energy gap law for product vibrations.
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Chattaraj PK, Maiti B. Regioselectivity in the Chemical Reactions between Molecules and Protons: A Quantum Fluid Density Functional Study. J Phys Chem A 2004. [DOI: 10.1021/jp035156a] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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