Nitrate Determination of Vegetables in Varzeghan City, North-western Iran.
چکیده
Background Vegetables play an important role in human nutrition. Nitrate content is a signifi-cant quality criterion to determine characteristic of vegetables. About 80% of nitrate intake in human is from vegetables and fruits. High dietary intake of nitrate is seen as an undesirable be-cause of its association with gastric cancer and infantile methemoglobinemia. Varzeghan, North¬western Iran is one of the cities with high Age-standardized incidence rates (ASR) of gastric can¬cer in Iran. Currently, in Varzeghan there is no available and accurate information describing ni¬trate concentration as one of the important risk factors of vegetables for human consumption. Methods In this cross sectional study totally 11 types of vegetables (cabbage, lettuce, spinach, parsley, coriander, dill, leek, fenugreek, tarragon, fumitory and mint) from several different green¬grocery of Varzeghan were collected in spring (April) and autumn (November and December) 2011 and their nitrate contents were analyzed. Results Mean nitrate contents at the above noted fresh vegetables were 161, 781, 83, 707, 441, 501, 1702, 684, 805, 772 and 191 mg NO3-kg-1 respectively. In none of the 11 fresh vegetables nitrate content were not more than established limitations. Conclusion Nitrate concentrations were below of others reported at different countries. The mean concentration of nitrate at all vegetables in autumn was higher than in spring significantly.