CHEMICAL COMPOSITION AND HEPATOPROTECTIVE EFFECTS OF POLYPHENOLIC FRACTION FROM RIVEA HYPOCRATERIFORMIS IN PARACETAMOL INDUCED LIVER DAMAGE IN WISTAR ALBINO RATS

Objective: This study was designed to chemical composition and hepatoprotective effects of a polyphenolic fraction of aerial parts of R. hypocrateriformis (PPFRH). It was shown to exhibit strong in vitro lipid peroxidation and scavenging activity against hydroxyl radical.Methods: The chemical composition of a polyphenolic fraction of R. hypocrateriformis was analyzed by High-performance liquid chromatography method. Hepatocellular injuries induced by paracetamol were assessed by liver damage in Wistar albino rat; the hepatoprotective effect was evaluated by biochemical parameters in rat serum, antioxidant hydroxyl radical scavenging activity and lipid peroxidation in liver tissue.Results: The polyphenolic fraction of aerial parts of R. hypocrateriformis for lipid peroxidation is significantly (p<0.05). In the hepatoprotective activity of liver enzymes and hepatic necrosis were significantly (p<0.001) closer to paracetamol. The correlation coefficient between the hydroxyl scavenging radical and total phenolic and flavonoid contents were found to be R² = 0.9045 and R² = 0.8876 suggesting the contribution of phenolic and flavonoid compounds of the polyphenolic fraction of aerial parts of R. hypocrateriformis by 90% and 88% to its radical scavenging activity.Conclusion: The polyphenolic fraction of aerial parts of R. hypocrateriformis possesses a significant protective effect against acute hepatotoxicity induced by paracetamol and which may be due to the phenolic and flavonoid components

SYNTHESIS OF INDOLE, COUMARINYL AND PYRIDINYL DERIVATIVES OF ISONIAZID AS POTENT ANTITUBERCULAR AND ANTIMICROBIAL AGENTS AND THEIR MOLECULAR DOCKING STUDIES

Objective: The aim of this study was to the synthesis of indole, coumarinyl and pyridinyl derivatives of isoniazid as potent anti-TB and antimicrobial agents and their molecular docking studies.Methods: The structures of the newly synthesized compounds were confirmed by FT-IR, 1HNMR, and Mass spectroscopic methods and to evaluate the biological studies like anti-TB, antimicrobial and antioxidant activities. The mode of action of these active compounds was carried out by molecular docking studies.Results: Among all the synthesized compounds tested 5d was found to be the most active with M. tuberculosis H37Rv strain at 12.5µg/ml, 5b at 25µg/ml, 4d was found to be the most active with S. typhi, S. aureus and A. Nizer, 5a with A. Oryzae, 5c with A. terrous and A. Flavous and 5d with Shegella at 100µg/ml and some of the compounds like 4d, 5a, 5b and 5d have shown promising antioxidant properties.Conclusion: All the synthesized compounds have exhibited promising anti-TB, antimicrobial and antioxidant activities.Â

A facile and green strategy for the synthesis of Au, Ag and Au–Ag alloy nanoparticles using aerial parts of R. hypocrateriformis extract and their biological evaluation

A facile and green strategy is reported here to synthesize gold (Au), silver (Ag) and gold–silver (Au–Ag) alloy nanoparticles (NPs) through bio-reduction reactions of aqueous corresponding metal precursors mediated by extracts of aerial parts of R. hypocrateriformis, which act as both reducing and stabilizing agents, under microwave irradiation. UV–vis spectrophotometer, XRD, FT-IR, FESEM/TEM, TGA and EDAX analysis were used to characterize the obtained NPs. The formation of NPs is evident from their surface plasmon resonance peak observed at λmax=∼550, 450 and 500nm for Au, Ag and Au–Ag alloy NPs respectively. XRD pattern revealed that fcc structure, while FT–IR spectra signify the presence of phytochemicals adsorbed on NPs. Such a biofunctionalized NPs were characterized by their weight loss, 30 due to thermal degradation of plant phytochemicals observed in TG analysis. The spherical shape of Au, Ag and Au–Ag alloy NPs (∼10–50nm) is observed by FE-SEM/TEM images. EDAX analysis confirms the expected elemental composition. Moreover, these NPs showed enhanced antimicrobial, antioxidant, and anticancer activities, though it is more pronounced for Au–Ag alloy NPs, which is due to the combining effect of phytochemicals, Au and Ag metals. Thus, the biosynthesized NPs could be applied as effective growth inhibitors for various biomedical applications

Technologies for remediation of emerging contaminants in wastewater samples

Introduction Various Emerging Contaminants Different Types of Bimetallic Nanoparticles Methods Used for Synthesis Techniques Used for Characterization Methods Used for Remediation Conclusions Acknowledgment