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Wahajuddin,CSIR - Central Electrochemical Research Institute | Wahajuddin,National Institute of Pharmaceutical Education and Research, Rae Bareli | Arora S.,National Institute of Pharmaceutical Education and Research, Rae Bareli
International Journal of Nanomedicine | Year: 2012

A targeted drug delivery system is the need of the hour. Guiding magnetic iron oxide nanoparticles with the help of an external magnetic field to its target is the principle behind the development of superparamagnetic iron oxide nanoparticles (SPIONs) as novel drug delivery vehicles. SPIONs are small synthetic γ-Fe2O3 (maghemite) or Fe3O4 (magnetite) particles with a core ranging between 10 nm and 100 nm in diameter. These magnetic particles are coated with certain biocompatible polymers, such as dextran or polyethylene glycol, which provide chemical handles for the conjugation of therapeutic agents and also improve their blood distribution profile. The current research on SPIONs is opening up wide horizons for their use as diagnostic agents in magnetic resonance imaging as well as for drug delivery vehicles. Delivery of anticancer drugs by coupling with functionalized SPIONs to their targeted site is one of the most pursued areas of research in the development of cancer treatment strategies. SPIONs have also demonstrated their efficiency as nonviral gene vectors that facilitate the introduction of plasmids into the nucleus at rates multifold those of routinely available standard technologies. SPION-induced hyperthermia has also been utilized for localized killing of cancerous cells. Despite their potential biomedical application, alteration in gene expression profiles, disturbance in iron homeostasis, oxidative stress, and altered cellular responses are some SPION-related toxicological aspects which require due consideration. This review provides a comprehensive understanding of SPIONs with regard to their method of preparation, their utility as drug delivery vehicles, and some concerns which need to be resolved before they can be moved from bench top to bedside. © 2012 Wahajuddin and Arora, publisher and licensee Dove Medical Press Ltd.

Bhateria M.,CSIR - Central Electrochemical Research Institute | Bhateria M.,Academy of Scientific and Innovative Research | Ramakrishna R.,CSIR - Central Electrochemical Research Institute | Ramakrishna R.,Academy of Scientific and Innovative Research | And 3 more authors.
Journal of Chromatography B: Analytical Technologies in the Biomedical and Life Sciences | Year: 2015

Recently, a fixed dose combination (FDC) of memantine (MM) and donepezil (DPZ) has been approved for the treatment of Alzheimer's disease (AD). In the present work, a liquid chromatography-tandem mass spectrometry (LC-MS/MS) method for the simultaneous determination of MM and DPZ was developed and validated in rat plasma over the linearity range of 0.2-400ng/mL using amantadine (AM) as an internal standard. Both the analytes and IS were extracted using one step liquid-liquid extraction procedure. The analytes were separated on C18 reversed phase column with mobile phase consisting of a mixture of methanol and 10mM ammonium acetate, pH 5 (92:8 v/v) at a flow rate of 0.7mL/min. The detection of the analytes was done on triple quadrupole mass spectrometer operated in positive electrospray ionization mode (ESI) and quantified using multiple reaction monitoring (MRM). The method was fully validated in terms of linearity, accuracy, precision, recovery, matrix effect, dilution integrity, carry-over effect and stability. The within- and between-run precisions were <10% and accuracy was all within ±10%. The mean recovery of MM and DPZ was found to be greater than 80%. The % RSD value at higher as well as lower concentration was well within the acceptable range (±15%) in all the stability experiments. The method was successfully applied to the oral pharmacokinetics and drug-drug interaction study of MM and DPZ in male Sprague Dawley (SD) rats. © 2015 Elsevier B.V.

Koley D.,CSIR - Central Electrochemical Research Institute | Koley D.,Academy of Scientific and Innovative Research | Srinivas K.,CSIR - Central Electrochemical Research Institute | Krishna Y.,CSIR - Central Electrochemical Research Institute | Gupta A.,National Institute of Pharmaceutical Education and Research, Rae Bareli
RSC Advances | Year: 2014

A direct Mannich type diastereoselective biomimetic cyclization using acetal as a pro-nucleophile leading to the hydroxymethyl substituted bicyclic framework of various bicyclic alkaloids is presented. Following this protocol, total synthesis of (±)-epilupinine and formal syntheses of (±)-laburnine, (±)-isoretronecanol and (±)-tashiromine are described. © 2013 The Royal Society of Chemistry.

Singh S.P.,CSIR - Central Electrochemical Research Institute | Wahajuddin,CSIR - Central Electrochemical Research Institute | Tewari D.,CSIR - Central Electrochemical Research Institute | Patel K.,National Institute of Pharmaceutical Education and Research, Rae Bareli | Jain G.K.,CSIR - Central Electrochemical Research Institute
Fitoterapia | Year: 2011

In the present study, we are reporting permeability and pharmacokinetics of nobiletin in rat plasma and brain, using a validated reverse phase high performance liquid chromatographic method. Protein precipitation method was used for the extraction of nobiletin and coumarin (IS) from rat plasma and brain tissue. The system was run in isocratic mode with mobile phase consisting of potassium dihydrogen ortho-phosphate (pH 4.5; 0.04 mM) and acetonitrile in ratio of 50:50, v/v. The total chromatographic run time was 9.0 min. The method was proved to be accurate and precise at linearity range of 0.05-10 μg/mL with a correlation coefficient (r) of ≥ 0.994 in rat plasma and ≥ 0.995 in rat brain. The intra- and inter-day precision and accuracy values are found to be within the assay variability limits as per the FDA guidelines. Nobiletin was found stable in the battery of stability studies viz., bench-top, auto-sampler, freeze/thaw cycles and long term storage in a freezer at - 70 ± 10 °C. Maximum concentrations of nobiletin in both plasma and brain were observed at 1 h after single oral dosing (50 mg/kg). The maximum concentration in plasma and brain were 1.78 and 4.20 μg/mL, respectively. The AUC 0-t in plasma and brain were 7.49 and 20.66 μg•h/mL, respectively. The mean elimination half life (t 1/2) in plasma and brain were 1.80 and 11.42 h, respectively. The Parallel Artificial Membrane Permeability Assay (PAMPA) permeability of nobiletin was found to be high at both pH 4.0 and 7.0. © 2011 Elsevier B.V. All rights reserved.

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