1. Faculty of Chemical and Petroleum EngineeringUniv. of Tabriz Tabriz 51666‐16471 Iran
2. Dept. of Food Science, College of Agric.Univ. of Tabriz Tabriz 51666‐16471, I.R. Iran
3. Dept. of Agriculture, Food, Environmental and Animal SciencesUniv. of Udine via Sondrio 2/A 33100 Udine Italy