Assay of antioxidant potential of two Aspergillus isolates by different methods under various physio-chemical conditions

Brazilian Journal of Microbiology

Daljit Singh Arora¹  Priyanka Chandra¹ 

[1] ,Guru Nanak Dev University Department of Microbiology Microbial Technology LaboratoryAmritsar,India

关键词: Antioxidant potential;    Aspergillus;    Dot blot assay;    DPPH assay;    FRAP assay;    Reducing power;    Soil fungi;   

DOI  :  10.1590/S1517-83822010000300029

来源: SciELO

【 摘 要 】

The objective of this work was to screen fungi isolated from soil of different areas of Punjab, India for antioxidant activity by dot blot assay and around 45% of fungal isolates demonstrated antioxidant potential. Two selected strains of Aspergillus spp (Aspergillus PR78 and Aspergillus PR66) showing quantitatively best antioxidant activity by DPPH assay were further tested for their reducing power, ferrous ion and nitric oxide ion scavenging activity, FRAP assay and total phenolic content. Different physio-chemical parameters were optimized for enhancement of the activity. This revealed stationary culture grown for 10 days at 25ºC at pH 7 to be the best for antioxidant activity. Sucrose in the medium as carbon source resulted in highest antioxidant activity. Sodium nitrate, yeast extract, and peptone were good sources of nitrogen but sodium nitrate was the best among these. The extraction of the broth culture filtrates with different solvents revealed ethyl acetate extract to possess the best antioxidant activity. The activity as expressed by ethyl acetate extract of Aspergillus PR78 was equally effective as that of commonly used antioxidant standard, ascorbic acid.

【 授权许可】

CC BY-NC   
 All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License