Syavash Hemmaty - Urmia Branch, Urmia University, Urmia, Iran
Reza Hosseinzadeh - Urmia Branch, Urmia University, Urmia, Iran
Mohammd Reza Dilmaghani - Urmia Branch, Urmia University, Urmia, Iran
Ramin Tagiloo - Urmia University, Urmia, Iran
Mahdi Mohseniazar - Urmia University, Urmia, Iran

The effect of postharvest UV-C irradiation on phenolic compounds accumulation was investigated in berries of ‘Rishbaba’ table grape (Vitis vinifera cv. Rishbaba). Grape clusters were harvested at mature stage and irradiated with UV-C using fluorescent germicidal lamp (۳۰ W, ۹۰ cm) with a peak emission at ۲۵۴ nm for ۰ (control), ۵ and ۱۰ min. UV-C treatment had significant effect on individual phenolic compounds. Catechin, epicatechin, procyanidin B۲, quercetin ۳-galactoside, quercetin ۳-rhamnoside, chlorogenic acid and total polyphenols increased with UV-C dosage, but procyanidin B۱ and cyanidin ۳-galactoside decreased. Positive correlation was observed between UV-C treatment and individual phenolics except procyanidin B۱ and cyanidin ۳-galactoside. In conclusion, UV-C irradiation increased phenolic compounds of ‘Rishbaba’ table grape and its nutritional value.

Phenolic Compounds, Postharvest, ‘Rishbaba’ table grape, UV