Refine your search
Collections
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z All
Malathy, N.
- Synthesis and Antibacterial Activity of Certain Random Copolyesters from 4,4'- Oxybis (Benzoic Acid)
Abstract Views :422 |
PDF Views:103
Authors
N. Malathy
1,
D. Roop Singh
2
Affiliations
1 University Grants Commission-Faculty Development, Presidency College, Chennai, Tamil Nadu – 600005, IN
2 Post–Graduate & Research Department of Chemistry, Presidency College, Chennai, Tamil Nadu – 600005, IN
1 University Grants Commission-Faculty Development, Presidency College, Chennai, Tamil Nadu – 600005, IN
2 Post–Graduate & Research Department of Chemistry, Presidency College, Chennai, Tamil Nadu – 600005, IN
Source
Indian Journal of Science and Technology, Vol 5, No 3 (2012), Pagination: 2302-2306Abstract
Six new random copolyesters with ethereal linkages were prepared from a potential mesogenic non-linear monomer 4, 4'-oxybis(benzoic acid) by direct poly-condensation with different aliphatic and aromatic diols in pyridine solution. Diphenylchlorophosphate (DPCP) was employed as the condensation agent. Viscosity measurements, FTIR, 1H and 13C NMR spectral data were used for investigating their structural features. The thermal phase transition behavior of these polymers was investigated by Differential Scanning Calorimetry (DSC). Agar well diffusion method was employed to study the antibacterial activity of these random copolyesters. All the six random copolyesters showed significant inhibition against the test bacteria. The presence of ether group in the main chain of the polyester enhances the solubility in organic solvents and hence eases processing.Keywords
Non-linear Random Copolyesters, Arylidene Diol, Antibacterial ActivityFull Text
References
- Adriana Popa, Davidescu C, Trif R, Illia Gh, Smaranda Illescu and Dehelean Gh (2003) Study of quaternary ‘onium’ salts grafted on polymers; antibacterial activity of quaternary phosphonium salts grafted on 4 gel-type styrene-divinylbenzene copolymers. React. & Funct. Polym. 55, 151-158.
- Alexander M Klibanov, Jian Lin, Shuyi Qui and Kim Lewis (2003) The mechanism of bactericidal and fungicidal activities of textiles covalently modified with alkylated polyethylenimine. Biotechnol. Bioeng. 83, 168-172.
- Chitra M, Rajendran TV, Duraipandiyan V, Rajan CY and Ruben Jonathan D (2010) A study on the synthesis and bactericidal activity of certain copolyesters containing bischalcone moiety in the main chain. Indian J. Sci. & Technol. 3, 890-893.
- Higashi F, Hoshia A and KiyOshige J (1983) Preparation of aromatic polyesters the direct polycondensation reaction with diphenyl chlorophosphate in pyridine. J. Polym. Sci. Chem. Ed. 21, 3241-3247.
- Horbett Thomas, Ratner and Marek W Urban (1999) Antibacterical implants could prevent Infections, save patients’ lives. Sci. Daily, December,15.
- Jatin N Patel, Mitul B. Dolia, Mitesh B Patel and Rajni M Patel (2006) 4-Chloro-3- methyl Phenyl methacrylate copolymers with 2,4- dichlorophenylmethacrylate: Synthesis, characterization and antimicrobial activity. J. Appl. Polym. Sci. 100, 439-448.
- Kannappan V, Arumugasamy E, Ravichandran E and Baskar B (2000) Synthesis and Characterization of certain thermotropic liquid crystalline random copolyesters. J. Polym. Mater. 17, 4-9.
- Kannappan V, Mahendran S, Sathyamoorthi P and Roop Singh D (2001) Ultrasonic method of determination of glass transition temperatures of certain thermotropic liquid crystalline copolyesters. J. Poly. Mater. 18, 409-416.
- Lenz RW (1985) Characterization of thermotropic liquid crystalline polymers. J. Pure & Appl. Chem. 57, 977-984.
- Mark A Schoenfisch, Marc Ovadia and Jeanne E Pemberton (2000) Covalent surface chemical modification of electrodes for cardiac pacing applications. J. Biomed. Material Res. 51, 209-215.
- National Committee for Clinical Laboratory Standards (1993) Methods for dilution in antimicrobial susceptibility tests. Approved Standard M2 – A5. NCCLS, Villanova, PA.
- Pradip K Bhowmik, Edward DT, Atkins Robert W Lenz and HaeooskHan (1996) Crystalline and liquid crystalline polyesters of phenyl-substituted 4, 4'- Biphenols. 5. Copolymers with 4,4'-Oxybis(benzoic acid). Macromol. 29, 3778-3786.
- Rajakumar P, Ganesan K, Jayavelu S and Murugesan K (2005) Synthesis and bactericidal efficacy of novel dendrimers. Syn. Lett. 7, 1121-1124.
- Rajakumar P, Ganesan K, Jayavelu S and Murugesan K (2006) Synthesis and Antibacterial activity of dendritic architectures. Synthesis. 3, 528- 532.
- Reuben Jonathan D (2007) Synthesis, characterization and antibacterial activity of certain Poly (ester-amides), Univ. Madras. pp: 101.
- Sang Taek Oh, Sun Hong Han, Chang Sik Ha and Won Jei Cho (1996) Polymers as antimicrobial peptide mimics. J. Appl. Polym. Sci. 59, 1871-1878.
- Seok-Hee Hyun, Min-Woo Kim, Dae-Hee Oh, Jnn- Kyu Kang and Woo-Sik Kim (2006) Surface Characterization of 8-quinolinyl acrylate-grafted poly(ethylene terephthalate) prepared by plasma glow discharge and its antibacterial activity. J. Appl. Polym. Sci. 101, 863-868.
- Sinskey AJ, Akedo M and Gomez R (1977) Antimicrobial action of aliphatic diols and their Esters. J. Food Sci. 3, 699-701.
- Suhas Thattle, Kapil Datar and Raphael M Ottenbrite (2005) Perspectives on polymeric drugs and drug delivery systems. J. Bioact. Compt. Polym. 20, 585- 601.
- Sun SJ, Liao YC and Chang JC (2000) Studies on the synthesis and properties thermotropic liquid crystalline polycarbonates. VII. Liquid crystalline polycarbonates and poly (ester-carbonates) derived from various mesogenic groups. J. Polym. Sci. Part A: Polym. Chem. 38, 1852-1860.
- Detection of Blood Flow Obstruction through a Method in Healthy and Obsessed Subjects
Abstract Views :132 |
PDF Views:0
Authors
Affiliations
1 Department of Biomedical Engineering, Vel Tech Multitech, Chennai - 600062, Tamil Nadu, IN
2 Department of Electronics and Instrumentation Engineering, RMK Engineering College, Chennai - 601206, Tamil Nadu, IN
1 Department of Biomedical Engineering, Vel Tech Multitech, Chennai - 600062, Tamil Nadu, IN
2 Department of Electronics and Instrumentation Engineering, RMK Engineering College, Chennai - 601206, Tamil Nadu, IN
Source
Indian Journal of Science and Technology, Vol 9, No 1 (2016), Pagination:Abstract
Objectives: This study involves the measurement of obstructions in the blood flow of an arterial system. An attempt is made to find the correlation between the pressure and flow of the blood. Methods: The obstructed area produces vascular sounds which are acquired through disturbed blood flow patterns. The measurements are carried over by audio frequency analysis of the sound observed during arterial stenosis. These sounds can be measured using piezoelectric film sensor by placing it in the wrist and mid arm in the blood flow path. Results:The sounds that initiate in the narrowed arteries is measured by non-invasive, sensitive piezoelectric film sensor that captures the vibration caused by the flow of blood inside arteries and generate appropriate waveform for different flow conditions. Conclusion: The waveforms are analyzed in spectrum analyzer and compared with the normal flow patterns and if the values deviate from normal it is concluded for occlusion or clot that happened in the blood flow passage.Keywords
Arterial Stenosis, Blood Flow, Occlusion, Piezoelectric Film SensorFull Text