Determining the antioxidant activity of certain medicinal plants of Sonitpur, (Assam), India using DPPH assay

As part of a screening program for biologically active compounds in medicinal plants of northeast India, twelve plants were investigated for their phytochemical screening and anti-oxidant activity. The antioxidant activity was estimated by using 2, 2- diphenyl-picryl-hydrazyl (DPPH) free radical assay. Oroxylum indicum, Ipomoea aquatica and Moringa oleifera exhibited strong antioxidant activity as compared to other plants. Oroxylum indicum showed the highest antioxidant activity. The present study indicated that these plants are of therapeutic potential due to their high free-radical scavenging activity. The role of phytochemical constituents of these important medicinal plants in traditional medicine treatment is discussed

Synthesis, Characterization and ESR Studies of Zn1−x Co x O Nanoparticles

Zn1-x Co (x) O polycrystalline nanoparticles with different (x=0.03, 0.05, 0.1, 0.15, 0.2, 0.25, and 0.3) compositions were synthesized using the sol-gel technique. The effects of doping ratio and annealing temperature on structure and magnetic properties were investigated systematically. The phase, crystal structure, and microstructure of the Zn1-x Co (x) O nanoparticles were characterized using X-Ray diffraction and scanning electron microscope. Electron spin resonance spectra of Zn1-x Co (x) O nanoparticles were collected at room temperature on a Bruker EMX model X-band spectrometer operating at a frequency of 9.50 GHz