It was evident that the reducing power of the fungal extracts
demonstrated a dose-related effect. At higher concentrations
(20–50 mg/ml) the reducing power of various extracts was most
like the control a-tocopherol (1 mg/ml) for most fungal species,
as was demonstrated by a gradual plateau effect at high concentrations.
The moderate to high efficiency of the hot water extracts of
OYRM1, P. 32783, P. citrinopileatus, P. salmoneo-stramineus and T.
versicolor (1–50 mg/ml) is believed to be attributed to the use of
the microwave extraction process under controlled conditions.
These extraction conditions are assumed to have contributed to
extraction efficiency consequently increasing the recovery ofbiologically active compounds compared to other investigations.
At 1 mg/ml the mycelial hot water extract of P. eryngii grown by
SLF demonstrated a reducing power of 0.06 ± 0.00. Abdullah,
Ismail, Aminudin, Shuib, and Fye (2012) demonstrated a hot water
extract of P. eryngii at 1 mg/ml to be 0.17 ± 0.04, however, this
study was based on the fungal fruiting body. This highlights that
there is considerable differences in effectiveness of biologically
active compounds at various stages of growth.