title: Changes in nitrate and nitrite content, and search for nitrosamines in storage-abused spinach and beets.
mesh_terms: D003296:Cooking; D005519:Food Preservation; D005615:Freezing; D006863:Hydrogen-Ion Concentration; D009025:Morpholines / Q000032:analysis; D009566:Nitrates / Q000032:analysis*; D009573:Nitrites / Q000032:analysis*; D009602:Nitrosamines / Q000032:analysis*; D009603:Nitroso Compounds / Q000032:analysis; D010880:Piperidines / Q000032:analysis; D011759:Pyrrolidines / Q000032:analysis; D013045:Species Specificity; D013696:Temperature; D013997:Time Factors; D014675:Vegetables / Q000009:adverse effects / Q000032:analysis*
chemical_list: D009025:Morpholines; D009566:Nitrates; D009573:Nitrites; D009602:Nitrosamines; D009603:Nitroso Compounds; D010880:Piperidines; D011759:Pyrrolidines