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Sakthivel Gandhi,Swaminathan Sethuraman,Uma Maheswari Krishnan 한국고분자학회 2013 Macromolecular Research Vol.21 No.8
Biocompatible and biodegradable polyesters have immense potential in medical applications as drug delivery vehicles and tissue engineering scaffolds. In this study, we synthesized biodegradable aliphatic polyesters,namely poly(butylene pimelate) (PBPi), poly(butylene succinate) (PBSu), and poly(butylene sebacate) (PBSe), by the polycondensation of equimolar quantities of dicarboxylic acid and diol using mesoporous SBA-15 silica as heterogeneous catalyst. We then compared its performance with a conventional homogenous catalyst, SnCl2·2H2O, which did not form these polymers. The synthesized SBA-15 catalyst was characterized by electron microscopy, nitrogen adsorption-desorption isotherm and infrared spectroscopy. The synthesized polyesters were evaluated using infrared spectroscopy, X-ray diffraction, nuclear magnetic resonance spectroscopy, differential scanning calorimetry, gel permeation chromatography, scanning electron microscopy and goniometry. The combined results demonstrate that the SBA-15 mesoporous catalyst formed higher molecular weight degradable polyesters in addition to higher yield and purity, thus confirming the superiority of the mesoporous silica catalyst for polymer formation.
Protein Adsorption Characteristics and Inflammatory Response of Lipoplexes of DNA and si-RNA
Dhiraj Bhavsar,Lakshmi Narashimhan Ramana,Krishnakumar Subramanian,Swaminathan Sethuraman,Uma Maheswari Krishnan 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2015 NANO Vol.10 No.4
Objective: A major limitation in gene delivery applications employing nanocarriers is the inflammatory response elicited when administered in vivo. The mode of complexation of the oligonucleotide with the carrier can alter its interactions with biomolecules, a fact that has not been explored for lipoplexes hitherto. Materials: Liposomes prepared by thin film hydration were used to form lipoplexes of si-RNA and DNA, which exhibited a smaller size and a shift toward negative zeta potential when compared with blank liposomes. Results: The oligonucleotides wrap over the liposome surface and the surface coverage depends on the number of base pairs. The colloidal stability, protein resistance and cell uptake of lipoplexes were found to be dependent on surface charge and PEG. The lipoplexes with si-RNA did not induce cytokine production in BALB/c mice. Conclusion: The results highlight the importance of PEGylation for achieving good protein resistance without compromising cell uptake and therapeutic efficiency.
Dinesh Bose,Aadhav Anantharamakrishnan,Devi K. S. Shalini,Krishnan Uma Maheswari 한국탄소학회 2022 Carbon Letters Vol.32 No.4
Nitrophenol sensors have garnered interest in pharmaceuticals, agriculture, environment safety and explosives. Various methods have been proposed to detect 4-nitrophenol, but nitrophenol isomers such as 2,4-dinitrophenol (DNP) and 2,4,6-trinitrophenol have been comparatively less studied. For the first time, the present work explores graphitic nanocarbon, i.e., carbon black (CB) interface for sensing of DNP. Two reduction potentials were noted at − 0.48 and − 0.64 V for o-NO2 and p-NO2 moieties, respectively, at CB/GCE. At the same time, bare GCE (glassy carbon electrode) shows a single reduction potential at − 0.7 V. The electrocatalytic effect and adsorption ability of the interface was studied from the DNP concentration effect. Scan rate and pH studies suggest that the CB acquires four electrons for NO2 reduction by the diffusion phenomenon. A broad detection range of 10–250 µM DNP with a very low detection limit of 0.13 (o-form) and 0.15 µM (p-form) was achieved using the CB interface. The real-time applicability of the fabricated sensor was evaluated using commercially available beverages with excellent recovery values. The stability, repeatability and reproducibility of the CB interface were successfully confirmed. Comparison of the sensing parameters of the developed sensor with those reported in literature reveals excellent detection limit and response time for the CB-interfaced DNP sensor, indicating its potential for environmental and commercial applications.
Nagaraj M. Kulkarni,Milind M. Muley,Mallikarjun S. Jaji,G. Vijaykanth,J. Raghul,Neetin Kumar D. Reddy,Santosh L. Vishwakarma,Navin B. Rajesh,Jeyamurugan Mookkan,Uma Maheswari Krishnan,Shridhar Narayan 대한약학회 2015 Archives of Pharmacal Research Vol.38 No.6
Atorvastatin is a 3-hydroxy-3-methylglutarylcoenzyme-A reductase inhibitor used in the treatment ofatherosclerosis and dyslipidemia. Studies have evaluatedthe utility of statins in the treatment of skin inflammationbut with varied results. In the present study, we investigatedthe effect of atorvastatin on TNF-a release andkeratinocyte proliferation in vitro and in acute and chronic12-O-tetradecanoylphorbol-13-acetate (TPA) induced skininflammation in vivo. Atorvastatin significantly inhibitedlipopolysacharide induced TNF-a release in THP-1 cellsand keratinocyte proliferation in HaCaT cells. In an acutestudy, topical atorvastatin showed dose dependent reductionin TPA induced skin inflammation with highest efficacyobserved at 500 lg/ear dose. In chronic study, topicalatorvastatin significantly reduced TPA induced ear thickness,ear weight, cutaneous cytokines, MPO activity andimproved histopathological features comparable to that ofdexamethasone. Atorvastatin also inhibited TPA stimulatedNF-jB activation in mouse ear. In conclusion, our resultssuggest that atorvastatin ameliorates TPA induced skininflammation in mice at least in part, due to inhibition ofcytokine release and NF-jB activation and may be beneficialfor the treatment skin inflammation like psoriasis.