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Pandit A, Kumar KD, Kumar R. In vitro degradation and antibacterial activity of bacterial cellulose deposited flax fabric reinforced with polylactic acid and polyhydroxybutyrate. Int J Biol Macromol 2024; 266:131199. [PMID: 38574917 DOI: 10.1016/j.ijbiomac.2024.131199] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2023] [Revised: 03/24/2024] [Accepted: 03/26/2024] [Indexed: 04/06/2024]
Abstract
The objective of this study was to prepare biocomposites through the solution casting method followed by compression moulding in which bacterial cellulose (BC) deposited flax fabric (FF) produced through fermentation is coated with minimal amount of polylactic acid (PLA) and polyhydroxybutyrate (PHB). Biocomposites incorporated with 60 % of PLA or PHB (% w/w) show enhanced tensile strength. Cross-sectional morphology showed good superficial interaction of these biopolymers with fibres of FF thereby filling up the gaps present between the fibres. The tensile strength of biocomposites at 60 % PLA and 60 % PHB improved from 37.97 MPa (i.e., BC deposited FF produced in presence of honey) to 67.17 MPa and 56.26 MPa, respectively. Further, 0.25 % of nalidixic acid (NA) (% w/w) and 6 % of oleic acid (OA) (% w/w) incorporation into the biocomposites imparted prolonged antibacterial activity against Escherichia coli, Staphylococcus aureus and Pseudomonas aeruginosa. The in vitro cytotoxicity of biocomposites was determined using L929 mouse fibroblast cells. The 3-(4,5-cime- thylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide cytotoxicity tests showed that the PHB derived biocomposites along with antibacterial compounds in it were non-toxic. In vitro degradation of biocomposites was measured for up to 8 weeks in the mimicked physiological environment that showed a gradual rate of degradation over the period.
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Affiliation(s)
- Abhay Pandit
- Department of Biotechnology, Central University of South Bihar, Gaya 824236, India
| | - K Dinesh Kumar
- Department of Materials Science & Engineering, Indian Institute of Technology, Patna 801106, India
| | - Rakesh Kumar
- Department of Biotechnology, Central University of South Bihar, Gaya 824236, India.
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Rani P, Yadav PK, Singh AK, Nayak S, Kumar KD, Kumar R. Structural, material and antibacterial properties of quercetin incorporated soy protein isolate films and its binding behavior through molecular docking. Biopolymers 2024; 115:e23569. [PMID: 37970979 DOI: 10.1002/bip.23569] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2023] [Revised: 11/05/2023] [Accepted: 11/06/2023] [Indexed: 11/19/2023]
Abstract
This study aimed to investigate the three different methods for the fabrication of quercetin (1%-3% w/w of protein) incorporated soy protein isolate (SPI) films and their effect on material properties. The quercetin incorporated SPI films prepared by these methods were characterized by Fourier transform infrared (FTIR) spectroscopy, UV-Vis spectrophotometer, tensile properties, and water uptake and leaching properties. The cross-linking pattern was revealed by the FTIR spectrum that showed formation of an ester group because of interaction between the quercetin hydroxyl group and the carboxyl side chain of SPI amino acids. The tensile strength of SPI films were enhanced with the addition of quercetin as it increased to a maximum of 6.17 MPa while neat SPI film had tensile strength 4.13 MPa. The prepared films exhibit significant antibacterial activity against Listeria monocytogenes and Escherichia coli. The In-silico docking analysis demonstrates that covalent and non-covalent forces play crucial roles in binding interaction. It shows the formation of four hydrogen bonds, two salt bridges along with one pi-alkyl interaction. The simulation studies reflect the crucial amino acid residues involved in SPI-quercetin binding. The effect of quercetin binding with SPI on its stability and compactness is revealed by Root mean square deviation (RMSD) and radius of gyration studies.
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Affiliation(s)
- Priya Rani
- Department of Biotechnology, Central University of South Bihar, Gaya, India
| | - Piyush Kumar Yadav
- Department of Bioinformatics, Central University of South Bihar, Gaya, India
| | - Ajay Kumar Singh
- Department of Bioinformatics, Central University of South Bihar, Gaya, India
| | - Suman Nayak
- Department of Chemistry, Indian Institute of Technology, Patna, India
| | - K Dinesh Kumar
- Department of Materials Science & Engineering, Indian Institute of Technology, Patna, India
| | - Rakesh Kumar
- Department of Biotechnology, Central University of South Bihar, Gaya, India
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Sreenath P, Mandal S, Singh S, Panigrahi H, Das P, Bhowmick AK, Dinesh Kumar K. Unique approach to debundle carbon nanotubes in polymer matrix using carbon dots for enhanced properties. Eur Polym J 2020. [DOI: 10.1016/j.eurpolymj.2019.109454] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Kumar R, Kumari P, Priyaragini S, Dinesh Kumar K. Fabrication of poly lactic acid incorporated bacterial cellulose adhered flax fabric biocomposites. Biocatalysis and Agricultural Biotechnology 2019. [DOI: 10.1016/j.bcab.2019.101277] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Sreenath P, Mandal S, Singh S, Das P, Bhowmick AK, Dinesh Kumar K. Remarkable synergetic effect by in-situ covalent hybridization of carbon dots with graphene oxide and carboxylated acrylonitrile butadiene rubber. POLYMER 2019. [DOI: 10.1016/j.polymer.2019.05.051] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Satyanarayana MS, Sreenath PR, Bhowmick AK, Kumar KD. Selective Orientation of Needlelike Sepiolite Nanoclay in Polymer Blend for Controlled Properties. ACS Omega 2018; 3:11691-11702. [PMID: 31459265 PMCID: PMC6645478 DOI: 10.1021/acsomega.8b01618] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/11/2018] [Accepted: 09/11/2018] [Indexed: 06/10/2023]
Abstract
Sepiolite nanoclay needles have been selectively localized either in the natural rubber (NR) phase or in the carboxylated nitrile rubber (XNBR) phase of the XNBR/NR (50/50) blend prepared by the solution casting method. In a systematic manner, the role of the difference value between the interaction parameter of individual blend components (NR or XNBR)/solvent and the interaction parameter of sepiolite nanoclay/solvent in selectively localizing the sepiolite nanoclay to the NR phase or the XNBR phase of the XNBR/NR (50/50) blend has been explored. A higher percentage of sepiolite nanoclay resides in the dispersed NR phase when the difference value between the interaction parameter of NR/solvent and the interaction parameter of sepiolite nanoclay/solvent is lower than the difference value between the interaction parameter of XNBR/solvent and the interaction parameter of sepiolite nanoclay/solvent. On the other hand, a higher percentage of sepiolite nanoclay resides in the continuous XNBR phase when the difference value between the interaction parameter of XNBR/solvent and the interaction parameter of sepiolite nanoclay/solvent is lower than the difference value between the interaction parameter of NR/solvent and the interaction parameter of sepiolite nanoclay/solvent. It has been shown that by judiciously choosing different solvent combinations to prepare the blend and to disperse nanoclay, it is possible to fine-tune the difference value between the interaction parameter of individual blend components (NR or XNBR)/solvent and the interaction parameter of sepiolite nanoclay/solvent and dictate the selective localization of sepiolite nanoclay to the NR phase or the XNBR phase of XNBR/NR (50/50) blend. This study shows that it is possible to generate a rubber blend with controlled properties by selectively localizing needlelike sepiolite nanoclay in the dispersed phase or the continuous phase of the rubber blend prepared by the solution casting method.
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Affiliation(s)
- M. S. Satyanarayana
- Department of Metallurgical
and Materials Engineering, Indian Institute
of Technology, Patna 801106, India
| | - P. R. Sreenath
- Department of Metallurgical
and Materials Engineering, Indian Institute
of Technology, Patna 801106, India
| | - Anil K. Bhowmick
- Rubber
Technology Centre, Indian Institute of Technology, Kharagpur 721302, India
| | - K. Dinesh Kumar
- Department of Metallurgical
and Materials Engineering, Indian Institute
of Technology, Patna 801106, India
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Kasyapi N, Dinesh Kumar K, Bhowmick AK. Sustainable bionanocomposite from d, l-lactide/δ-valerolactone triblock and bionanowhiskers: Preparation, characterization, and properties. J Appl Polym Sci 2018. [DOI: 10.1002/app.46035] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Nibedita Kasyapi
- Department of Materials Science and Engineering, School of Engineering and Technology; Indian Institute of Technology Patna; Patna 801103 India
| | - K. Dinesh Kumar
- Department of Materials Science and Engineering, School of Engineering and Technology; Indian Institute of Technology Patna; Patna 801103 India
| | - Anil K. Bhowmick
- Department of Materials Science and Engineering, School of Engineering and Technology; Indian Institute of Technology Patna; Patna 801103 India
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Kasyapi N, Dinesh Kumar K, Bhowmick AK. Influence of microstructure of lactone-based triblock copolymers on drug release behavior of their microspheres. J Appl Polym Sci 2017. [DOI: 10.1002/app.45284] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Nibedita Kasyapi
- Department of Materials Science and Engineering, School of Engineering and Technology; Indian Institute of Technology Patna; Patna 800013 Bihar India
| | - K. Dinesh Kumar
- Department of Materials Science and Engineering, School of Engineering and Technology; Indian Institute of Technology Patna; Patna 800013 Bihar India
| | - Anil K. Bhowmick
- Rubber Technology Centre, Indian Institute of Technology Kharagpur; Kharagpur 721302 West Bengal India
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Sreenath P, Singh S, Satyanarayana M, Das P, Dinesh Kumar K. Carbon dot – Unique reinforcing filler for polymer with special reference to physico-mechanical properties. POLYMER 2017. [DOI: 10.1016/j.polymer.2017.02.014] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Senthil Kumar G, Dinesh Kumar K, Minogue PJ, Berthoud VM, Kannan R, Beyer EC, Santhiya ST. The E368Q Mutant Allele of GJA8 is Associated with Congenital Cataracts with Intrafamilial Variation in a South Indian Family. Open Access J Ophthalmol 2016; 1:106. [PMID: 28530003 PMCID: PMC5438206] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
PURPOSE To determine the basis of the autosomal dominant congenital cataracts in a three generation south Indian pedigree. METHODS The proband and several family members underwent a complete ophthalmic examination. The coding regions of eight candidate genes (CRYAA, CRYBB2, CRYGC, CRYGD, GJA3, GJA8, AQP0, and PITX3) were amplified by PCR and directly sequenced. Wild type and mutant connexin50 (Cx50) were expressed by stable transfection of HeLa cells. Their cellular distributions and function were examined by immunofluorescence microscopy and by microinjection of gap junction permeant tracers, respectively. RESULTS Congenital cataracts (with some variations in phenotype) segregated as an autosomal dominant trait within a three generation pedigree. Three affected individuals (proband, sibling and mother) showed a sequence variation in the candidate gene GJA8 encoding Cx50: a c.1102G>C transversion encoding a substitution of glutamate for glutamine at position 368 (E368Q). This substitution was absent from an unaffected family member (paternal aunt) and 100 healthy controls of the same ethnicity. In transfected HeLa cells, both wild type Cx50 and E368Q localized to gap junction plaques, and supported similar levels of intercellular transfer of Neurobiotin. CONCLUSIONS The E368Q mutant allele of GJA8 is associated with autosomal dominant congenital cataracts with phenotypic variability. E368Q forms gap junction plaques and functional channels in transfected HeLa cells.
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Affiliation(s)
- G Senthil Kumar
- Department of Genetics, Dr. ALM Post Graduate Institute of Basic Medical Sciences, University of Madras, India
| | - K Dinesh Kumar
- Department of Genetics, Dr. ALM Post Graduate Institute of Basic Medical Sciences, University of Madras, India
| | - PJ Minogue
- Department of Pediatrics, University of Chicago, USA
| | - VM Berthoud
- Department of Pediatrics, University of Chicago, USA
| | - R Kannan
- Appasamy Krishna Hospital, Velachery, India
| | - EC Beyer
- Department of Pediatrics, University of Chicago, USA
| | - ST Santhiya
- Department of Genetics, Dr. ALM Post Graduate Institute of Basic Medical Sciences, University of Madras, India
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Kumar KD, Kumar GS, Santhiya ST. Nonspecific PCR amplification of CRYBB2-pseudogene leads to misconception of natural variation as mutation. Invest Ophthalmol Vis Sci 2012; 53:5770. [PMID: 22915216 DOI: 10.1167/iovs.12-10575] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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Abstract
A finite-time attitude tracking control scheme is proposed for spacecraft using terminal sliding mode and Chebyshev neural network (NN) (CNN). The four-parameter representations (quaternion) are used to describe the spacecraft attitude for global representation without singularities. The attitude state (i.e., attitude and velocity) error dynamics is transformed to a double integrator dynamics with a constraint on the spacecraft attitude. With consideration of this constraint, a novel terminal sliding manifold is proposed for the spacecraft. In order to guarantee that the output of the NN used in the controller is bounded by the corresponding bound of the approximated unknown function, a switch function is applied to generate a switching between the adaptive NN control and the robust controller. Meanwhile, a CNN, whose basis functions are implemented using only desired signals, is introduced to approximate the desired nonlinear function and bounded external disturbances online, and the robust term based on the hyperbolic tangent function is applied to counteract NN approximation errors in the adaptive neural control scheme. Most importantly, the finite-time stability in both the reaching phase and the sliding phase can be guaranteed by a Lyapunov-based approach. Finally, numerical simulations on the attitude tracking control of spacecraft in the presence of an unknown mass moment of inertia matrix, bounded external disturbances, and control input constraints are presented to demonstrate the performance of the proposed controller.
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Kumar KD, Tsou AH, Bhowmick AK. Interplay between bulk viscoelasticity and surface energy in autohesive tack of rubber-tackifier blends. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/polb.21985] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Kumar KD, Tsou AH, Bhowmick AK. Unique Tackification Behavior of Needle-like Sepiolite Nanoclay in Brominated Isobutylene-co-p-methylstyrene (BIMS) Rubber. Macromolecules 2010. [DOI: 10.1021/ma100472r] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- K. Dinesh Kumar
- Rubber Technology Centre, Indian Institute of Technology, Kharagpur 721302, India
| | - Andy H. Tsou
- Corporate Strategic Research, ExxonMobil Research and Engineering, Annandale, New Jersey 08801
| | - Anil K. Bhowmick
- Rubber Technology Centre, Indian Institute of Technology, Kharagpur 721302, India
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Ahmad Z, Kumar KD, Saroop M, Preschilla N, Biswas A, Bellare JR, Bhowmick AK. Highly transparent thermoplastic elastomer from isotactic polypropylene and styrene/ethylene-butylene/styrene triblock copolymer: Structure-property correlations. POLYM ENG SCI 2009. [DOI: 10.1002/pen.21540] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Kumar KD, Gupta S, Sharma B, Tsou AH, Bhowmick AK. Probing the viscoelastic properties of brominated isobutylene-co-p-methylstyrene rubber/tackifier blends using a rubber process analyzer. POLYM ENG SCI 2008. [DOI: 10.1002/pen.21195] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Kumar KD, Gupta S, Tsou AH, Bhowmick AK. Compatibility and viscoelastic properties of brominated isobutylene-co-p-methylstyrene rubber/tackifier blends. J Appl Polym Sci 2008. [DOI: 10.1002/app.28649] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Mythili A, Subrahmanyam KAV, Kumar KD. Type 1 renal tubular acidosis with sensorineural deafness. J Assoc Physicians India 2007; 55:303-5. [PMID: 17694794] [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: 05/16/2023]
Abstract
We report a case of Type 1 Renal Tubular Acidosis (RTA) in association with sensorineural deafness. Inherited Type 1 RTA is usually autosomal dominant, though there is a rarer recessive form associated with nerve deafness. Simple alkali replacement can correct the systemic metabolic defect, but does not appear to ameliorate hearing loss.
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Affiliation(s)
- A Mythili
- Department of Endocrinology, Andhra Medical College, Visakhapatnam 17
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Abstract
Arachin forms a gel at acidic pH (pH less than 3.8) which is thermolabile. The factors governing the gelation seem to be the concentration of the protein, heating temperature, heating interval, cooling temperature of the heated solution, pH, ionic strength and dielectric constant of the medium. Urea decreases gel strength. The cross-links involved in the gelatin of arachin seem to be noncovalent in nature.
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