Formulation, characterization and in vivo evaluation of Hedera helix L., topical dosage forms.

The purpose of this study was to prepare topical formulations of micro emulsion, gel and ointment containing the Hedera helix L. extracts against asthma and to evaluate the physicochemical characteristics. A validated HPLC method was used for the analysis of blood plasma. In-vivo studies of the drugs were compared in rabbit plasma with oral dosing. Stability studies were performed for 3 months. The results showed that formulations were stable. No Skin irritation observed on rabbits. The optimized micro emulsion and gel showed fast absorption. Maximal plasma concentration (cmax) and the maximal time to reach cmax (tmax) were 70.226µg/mL, 75.26µg/mL and 2 hours for the micro emulsion and gel, 90.11µg/mL and 1 hour for the oral drug syrup respectively. Pharmacokinetic parameters such as tmax, cmax and AUC of the selected formulations and oral dosing were significantly different (P < 0.01).

Spectrophotometric investigation of Glutathione modulation by Thallium chloride in aqueous medium.

Thallium has been shown to significantly influence various tissues of living organisms; Exposure to Thallium can disturb mitochondrial function, degenerate neurons, and interfere with the function of critical metabolic enzymes and co-enzymes. Glutathione (GSH) an essential biomarker is considered a key factor in harnessing the thallium toxicity. In the present study the interaction of Thallium (Thallium Chloride) and glutathione was investigated spectro-photo-metrically in aqueous media. The renowned Elman's experimental protocol was followed at a wavelength of 412nm for Glutathione quantification in each sample. The pH of each sample was maintained at 7.6 using Phosphate buffer during the entire course of the experiment. A concentration as well as time dependent depletion of glutathione after exposure to various concentration of Thallium metal was observed, revealing chemical interaction between the metal and glutathione. The exact mechanism of interaction of Thallium and glutathione is still to be investigated. However, this piece of research suggests that a decrease in the concentration of Glutathione may be due to Thallium-GSH abduct or oxidize glutathione (GSSG) formation. This study was performed in-vitro as a model of in vivo.

Report: Palladium glutathione, N-acetylcysteine, D-penicillamine conjugation chemistry.

The metalloelement Palladium has a number of potential Pharmaco-clinical advantages. Palladium compounds have antiviral, antibacterial, neuroprotective and antitumor properties. However studies have also indicated some mild to serious toxic effects of Palladium metalloelements. Biothiols are important antioxidants that provide protection against metals toxicity. The interaction of metalloelements with biothiols can provide valuable information about the level of toxicity of the metalloelements and about the protective role of biothiols thereof. In this piece of work the effect of salt and complexes of Palladium on the status of different thiols (GSH, NAC, and D-Pen) in aqueous medium, were examined, The thiol quantification was carried out using Elman's method through UV-visible spectrophotometry and 1H- NMR. Results of the study performed in aqueous medium showed that level of different thiols depleted after the addition of the inorganic salts and organic complexes of Palladium. The mechanism of interaction of Palladium with thiols was examined using H-NMR. The results indicate that the depletion in the level of thiols may be due to 1:1 or 1:2 conjugation of Palladium with thiols. These conjugation reactions further suggest that the Palladium have xenobiotic nature causing oxidative stress and thiols play their role in detoxification and biotransformation of these metalloelements.