Time filter

Source Type

Ghāziābād, India

Afzal O.,Hamdard University | Kumar S.,Hamdard University | Haider M.R.,Hamdard University | Ali M.R.,Hamdard University | And 3 more authors.
European Journal of Medicinal Chemistry | Year: 2014

The advent of Camptothecin added a new dimension in the field anticancer drug development containing quinoline motif. Quinoline scaffold plays an important role in anticancer drug development as their derivatives have shown excellent results through different mechanism of action such as growth inhibitors by cell cycle arrest, apoptosis, inhibition of angiogenesis, disruption of cell migration, and modulation of nuclear receptor responsiveness. The anti-cancer potential of several of these derivatives have been demonstrated on various cancer cell lines. In this review we have compiled and discussed specifically the anticancer potential of quinoline derivatives, which could provide a low-height flying bird's eye view of the quinoline derived compounds to a medicinal chemist for a comprehensive and target oriented information for development of clinically viable anticancer drugs. © 2014 Elsevier Masson SAS. All rights reserved. Source

Negi L.M.,Jamia Hamdard University | Jaggi M.,Dabur Research Foundation | Talegaonkar S.,Jamia Hamdard University
Nanotechnology | Year: 2013

Development of an effective formulation involves careful optimization of a number of excipient and process variables. Sometimes the number of variables is so large that even the most efficient optimization designs require a very large number of trials which put stress on costs as well as time. A creative combination of a number of design methods leads to a smaller number of trials. This study was aimed at the development of nanostructured lipid carriers (NLCs) by using a combination of different optimization methods. A total of 11 variables were first screened using the Plackett-Burman design for their effects on formulation characteristics like size and entrapment efficiency. Four out of 11 variables were found to have insignificant effects on the formulation parameters and hence were screened out. Out of the remaining seven variables, four (concentration of tween-80, lecithin, sodium taurocholate, and total lipid) were found to have significant effects on the size of the particles while the other three (phase ratio, drug to lipid ratio, and sonication time) had a higher influence on the entrapment efficiency. The first four variables were optimized for their effect on size using the Taguchi L9 orthogonal array. The optimized values of the surfactants and lipids were kept constant for the next stage, where the sonication time, phase ratio, and drug:lipid ratio were varied using the Box-Behnken design response surface method to optimize the entrapment efficiency. Finally, by performing only 38 trials, we have optimized 11 variables for the development of NLCs with a size of 143.52 ± 1.2 nm, zeta potential of -32.6 ± 0.54 mV, and 98.22 ± 2.06% entrapment efficiency. © 2013 IOP Publishing Ltd. Source

Singh R.K.,Indian Institute of Technology Roorkee | Prasad S.,Dabur Research Foundation | Singh U.P.,Indian Institute of Technology Roorkee
Protein and Peptide Letters | Year: 2010

The superoxide anion radical is a highly reactive toxic species produced during metabolic processes. Several copper (II) complexes with peptides are known to show superoxide dismutase (SOD) activity but those having a peptide with a non-natural amino acid are limited. The synthesis of HisAibGly peptide and its complexation with copper (II) ions has been reported. The interaction of the synthetic peptide with Cu(II) was studied by electron spray ionization-mass (ESI-MS), circular dichroism (CD), absorption (UV-Vis) and electron paramagnetic resonance (EPR) spectroscopic methods. The solution studies and species distribution were performed by both spectrophotometric and potentiometric methods. The studies were performed at 25 ± 0.1 °C with constant ionic strength (μ = 0.1 M NaNO3) in aqueous solution using Bjer-rum-Calvin's pH-titration technique as adopted by Irving and Rossotti for binary systems. The species distribution stidies indicated that the complexation occurred from 3-11 pH and a three nitrogen coordinated species predominates at 8-9 whereas a four nitrogen coordinated species was formed between pH 9-11. The copper-peptide complex was tested for SOD activity using xanthine-xanthine oxidase - nitroblue tetrazolium (NBT) methods. © 2010 Bentham Science Publishers Ltd. Source

Negi L.M.,Jamia Hamdard University | Jaggi M.,Dabur Research Foundation | Talegaonkar S.,Jamia Hamdard University
International Journal of Pharmaceutics | Year: 2014

The present study investigates the screening of the formulation components as well as evaluates the quality issues of the nanostructured lipid carriers (NLCs) for the anticancer agent, CPT-11. The stepwise screening of the components for the preparation of NLCs requires the selection of liquid lipid or oil, based on the relative solubility of CPT-11 in different oils. Maximum solubility of the CPT-11 was found in capmul MCM-C8 (81 ± 0.5 mg/ml). Hence, it was selected as the liquid lipid for the development of NLCs. Solid lipids gelucire 39/1, glyceryl mono stearate (GSM) and compritol ATO 888 were observed to have good affinity for the drug on systematic screening of different solid lipids. However, gelucire 39/1 and GSM were found to have lower physical compatibility (miscibility) with capmul MCM C-8. Hence, compritol ATO 888 was selected as the solid lipid phase for the preparation of NLCs. Ratio of liquid lipid (oil) to solid lipid was optimized with the intention of maximizing the oil concentration (as oil was found to have higher solubility of drug) as well as producing a lipid mix with sufficient melting point to maintain solid state. The liquid-solid lipid mixture in the ratio up to 30:70 was observed to have sufficient melting point (52.48 ± 1.2 C). Pluronic F-68 was selected as the main surfactant for the preparation of NLCs because of its good emulsification efficacy for the solid lipid liquid mix. The optimized formulation was also evaluated for the different quality issues. PXRD data revealed that the characteristic peaks of the compritol were present in the NLC samples and there was no appreciable polymorphic change when the formulation was stored for 6 months. Electron microscopic and DLS studies proved the absence of different colloidal species. Thermal analysis by DSC revealed that the lipid particles maintained sufficiently good melting point even after nanosizing. Absence of gelation on multiple syringing and resilience for the stress provided by autoclaving further established the quality of the developed NLCs. © 2013 Elsevier B.V. Source

Tariq M.,Jamia Hamdard University | Alam M.A.,National Institute of Immunology | Singh A.T.,Dabur Research Foundation | Iqbal Z.,Jamia Hamdard University | And 2 more authors.
Colloids and Surfaces B: Biointerfaces | Year: 2015

Epirubicin (EPI) is an anthracycline antineoplastic agent, commercially available for intravenous administration only and its oral ingestion continues to remain a challenge. Present investigation is aimed at the development of poly-lactic-co-glycolic acid (PLGA) nanoparticles (NPs) for oral bioavailability enhancement of epirubicin. Developed formulation revealed particle size, 235.3. ±. 15.12. nm, zeta potential, -27.5. ±. 0.7. mV and drug content (39.12. ±. 2.13. μg/mg), with spherical shape and smooth surface. Cytotoxicity studies conducted on human breast adenocarcinoma cell lines (MCF-7) confirmed the superiority of epirubicin loaded poly-lactic-co-glycolic acid nanoparticles (EPI-NPs) over free epirubicin solution (EPI-S). Further, flow cytometric analysis demonstrated improved drug uptake through EPI-NPs and elucidated the dominance of caveolae mediated endocytosis for nanoparticles uptake. Transport study accomplished on human colon adenocarcinoma cell line (Caco-2) showed 2.76 fold improvement in permeability for EPI-NPs as compared to EPI-S (p<. 0.001) whereas a 4.49 fold higher transport was observed on rat ileum; a 1.8 fold higher (p<. 0.01) in comparison to Caco-2 cell lines which confirms the significant role of Peyer's patches in absorption enhancement. Furthermore, in vivo pharmacokinetic studies also revealed 3.9 fold improvement in oral bioavailability of EPI through EPI-NPs. Henceforth, EPI-NPs is a promising approach to replace pre-existing intravenous therapy thus providing "patient care at home". © 2015. Source

Discover hidden collaborations