WSSF-NPs were successfully prepared using electron beam irradiation.
Electron beam irradiation reduces MW of SF from 250 to 37 kDa.
WSSF-NPs are spherical with nanoscaled size as small as 40 nm.
WSSF-NPs show effective antioxidant and reducing power than non-irradiated SF.
WSSF-NPs display powerful reducing agent for green synthesis of gold nanocolloid.