2.6.9. Determination of antioxidant activity of H. erinaceus extract,
wine and vinegar
ABTS and 2.20-azobis (2-amidinopropane) dihydrochloride
(AAPH) were dissolved in phosphate-buffered saline (PBS, containing
150 mM NaCl) in a 1:1 ratio and the mixture was incubated
in a 37 C water bath to an absorbance at 734 nm. An aliquot of each
sample was mixed with ABTS solution. After incubation at 37 C for
10 min, the absorbance was determined again at 734 nm. The
concentration of ABTS was expressed as mg ml1 of extract.
Radical-scavenging activity was determined in accordance with the
method of Brand-Williams, Cuvelier, and Berset (1995). The reactionwas
initiated by adding 20 ml of sample. The bleaching of DPPH
was determined at 515 nm at 25 C for 20 min. The antioxidant
activity was calculated as follows: Antioxidant activity
(%) ¼ [(Absorbance of control - Absorbance of sample)/Absorbance
of control] 100.