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Related Experiment Videos

Reduction of gastric carcinogens with ascorbic acid.

R Raineri, J H Weisburger

    Annals of the New York Academy of Sciences
    |September 30, 1975
    PubMed
    Summary

    Nitrate in potatoes can convert to nitrite at room temperature, but cold temperatures prevent this. Ascorbic acid can reduce nitrite formation and inhibit harmful nitrosourea compounds in simulated gastric conditions.

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    Area of Science:

    • Food Science
    • Biochemistry
    • Toxicology

    Background:

    • Nitrate is a common food additive and naturally occurring compound.
    • Nitrite formation in food can lead to the production of potentially harmful nitrosamines.
    • Understanding nitrate-nitrite conversion in food matrices like potatoes is crucial for food safety.

    Purpose of the Study:

    • To investigate the conditions favoring nitrate reduction to nitrite in potatoes.
    • To assess the formation of methylnitrosourea (MNU) in potatoes under simulated gastric conditions.
    • To evaluate the inhibitory effect of ascorbate on nitrite and MNU formation.

    Main Methods:

    • Incubation of homogenized cooked and fresh potatoes with varying nitrate concentrations at different temperatures (2, 21, 25°C).
    • Analysis of nitrate and nitrite levels over 24 hours.
    • Incubation of potatoes with methylurea and nitrite under simulated gastric conditions (37°C, pH 1.5).
    • Assessment of MNU formation and the effect of ascorbate addition.

    Main Results:

    • Nitrite formation occurred in cooked and fresh potatoes at room temperature, correlating with nitrate levels.
    • Nitrate levels decreased significantly during nitrite formation, confirming reduction.
    • Incubation at 2°C completely inhibited nitrite formation.
    • MNU was formed in potatoes under simulated gastric conditions.
    • Ascorbate significantly inhibited MNU formation and reduced nitrite concentration.

    Conclusions:

    • Nitrate can be reduced to nitrite in potatoes at ambient temperatures, with inhibition at low temperatures.
    • Ascorbate effectively inhibits both nitrite accumulation and the formation of carcinogenic methylnitrosourea in potatoes under simulated gastric conditions.
    • These findings have implications for food processing and safety, particularly regarding the management of nitrate and nitrite content.

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