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Unformatted text preview: piperita, M. longifolia, M. spicata essential oils with contribution 80.9, 30.1, 55.5 and 61.8 %, respectively. The tested essential oils and their major components exhibited considerable antioxidant activity as measurements of DPPH radical scaven ging capacity and percent inhibition of linoleic acid peroxidation. Nevertheless, the oils and their major components showed very good antimicrobial activity (disc diffusion -, micro-dilution broth susceptibility-assay and MIC calculation) against selected strains of bacteria and pathogenic fungi. Significant (p <0.05) differences in the contents of most of the chemical components and biological activities among Mentha essential oils were recorded. Within the species analyzed, the essential oil from M.arvensis exhibited the strongest antioxidant activity while the oil from M. longifolia offered the most effective antimicrobial attributes. ANA-O18 EFFECT OF EXTRACTION REGIMES ON ANTIOXIDANT POTENTIAL OF RICE ( ORYZA SATIVA) BRAN EXTRACTS SAS Chatha, W Arshad and AI Hussain Department of Chemistry and Industrial Chemistry, Govt. College University, Faisalabad, Pakistan E-mail: firstname.lastname@example.org This work was carried out to assess the effect of different extraction methods on the antioxidant potential of rice (Oryza sativa) bran. The bran samples after stabilization were extracted using soaking, stirring and shaking methods with 80 % and pure methanol. The amounts of total phenolic (TP) and total flavonoid (TF) and reducing power, % inhibition of peroxidation in linoleic acid system and DPPH radical scavenging activity of different rice bran extracts varied significantly with respect to extraction methods and solvents. TP, TF, reducing power, % inhibition of peroxidation in linoleic acid system and DPPH radical scavenging activity of different rice bran extracts were found in range of 2.01 - 3.47 mg/g of GAE, 1.34 - 2.06 mg/g of CE, 1.19 - 1.73 mg/mL, 84.1 - 91.6 % and IC50 70.7 - 76.1 mg/mL, respectively. It was observed that 80 % methanol exhibited better extraction yield and antioxidant activit...
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This note was uploaded on 02/17/2011 for the course CHEMISTRY 101 taught by Professor Csr during the Spring '11 term at University of Louisville.
- Spring '11