m shekarchi food and drug control laboratories and food and drug laboratory research center, moh & me r naghshiband hassani department of horticultural sciences, faculty of agriculture, university of tabriz y mostofi department of horticultural sciences, college of agriculture and natural resources, university of tehran z zamani department of horticultural sciences, college of agriculture and natural resources, university of tehran m pirali hamedani department of research and development, food and drug control laboratories, moh & me, no. 31, imam khomeini street, tehran, iran tel: +989121307765 ; fax: +98-21-66404330