Effects of UV-B irradiation on the levels of anthocyanin, rutin and radical scavenging activity of buckwheat sprouts

•Dark-grown buckwheat sprouts irradiated one of 10 light regimes.•We examined the effect of UV-B at wavelengths of 260–320, 280–320, and 300–320nm.•Sprouts irradiated under UV-B wavelength of 300–320nm had high level of antioxidant activity.•Sprouts exposed to UV-B wavelength of 260–320 and 280–320nm died.