methemoglobinemia/ホウレンソウ

Methemoglobinemia is not a rare condition arising from the exposure to hemoglobin-oxidizing agents such as nitrates-nitrites present in well water or vegetables. Infants < 3 months of age are more susceptible than adults because of lower amounts of a key enzyme, NADH-cytochrome b5 reductase, which

Nitrites and nitrates are often responsible for methemoglobinemy. Infants, on account of their greater sensibility to oxidizing agents, are particularly liable to poison by nitrates and nitrites. Sodium nitrite can be responsible for poisoning after accidental ingestion or owing to an overdose when

When an infant presents severe cyanosis which is not associated with respiratory distress, methaemoglobinemia should always be suspected. In children its main inducers are contaminated water or vegetable broths with high nitrate levels (especially spinach and carrots) used to prepare powdered

Dietary nitrate (NO(3)), nitrite (NO(2)), and arginine can serve as sources for production of NO(x) (a diverse group of metabolites including nitric oxide, nitrosothiols, and nitroalkenes) via ultraviolet light exposure to skin, mammalian nitrate/nitrite reductases in tissues, and nitric oxide

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