Effect of UVB irradiation on total phenolic content of samples fermented by Cordyceps militaris and grain substrates: a) buckwheat and b) embryo rice. B=buckwheat, BM=buckwheat mycelia, B-U=UVB irradiated buckwheat, CBD-U=fermented then dried and UVB irradiated buckwheat, CBF-U=fermented and UVB irradiated buckwheat, CBN-U=fermented unirradiated buckwheat, ER=embryo rice, ERM=embryo rice mycelia, ER-U=UVB irradiated embryo rice, CERD-U=fermented then dried and UVB irradiated embryo rice, CERF-U=fermented and UVB irradiated embryo rice, CERN-U=fermented unirradiated embryo rice