Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/21033
Title: In vitro antioxidant activities of endophytic fungi isolated from the liverwort Scapania verrucosa
Authors: Zeng, PY
Wu, JG
Liao, LM
Chen, T
Wu, JZ
Wong, K 
Keywords: Endophytic fungi
Antioxidant activity
ABTS
DPPH
Scavenging ability
Ferrous ion chelating ability
Issue Date: 2011
Publisher: Funpec-Editora
Source: Genetics and molecular research, 2011, v. 10, no. 4, p. 3169-3179 How to cite?
Journal: Genetics and Molecular Research 
Abstract: We investigated in vitro antioxidant activities of 49 endophytic fungi isolated from the liverwort Scapania verrucosa. Based on morphological and molecular identification, the endophytic fungi isolated were classified into seven genera (Hypocrea, Penicillium, Tolypocladium, Chaetomium, Xylaria, Nemania, and Creosphaeria), all belonging to one family (Xylariaceae). By screening with the 2,2'-azino-di(3-ethylbenzthiazoline-6-sulfonic acid) (ABTS) decolorization assay, the ethyl acetate extracts of five endophytic fungi (T7, T21, T24, T32, and T38 strains), which exhibited remarkable Trolox equivalent (TE) antioxidant capacity (ranging from 997.06 to 1248.10 mu mol TE/g extract), were selected and their antioxidant capacity was further evaluated by assays for 2,2'-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging, hydroxyl radical scavenging, reducing power, and ferrous ion chelating. The ethyl acetate extracts of two endophytic fungi (T24 and T38) were found to have comparable scavenging abilities on both DPPH-free radicals (93.9 and 88.7%, respectively, at 50 mu g/mL) and hydroxyl radicals (97.1 and 89.4%, respectively, at 2 mg/mL) when compared with those of the positive controls (ascorbic acid and butylated hydroxytoluene, respectively). Although their reducing powers were similar to that of butylated hydroxytoluene, as indicated by absorbance (0.35 and 0.30 at 50 mu g/mL, respectively), only the T38 strain's ethyl acetate extract showed ferrous ion chelating ability (92.9% at 1 mg/mL) comparable to that of the EDTA-2Na control. These endophytic fungi in S. verrucosa are a potential novel source of natural antioxidants.
URI: http://hdl.handle.net/10397/21033
ISSN: 1676-5680
DOI: 10.4238/2011.December.20.1
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