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Related Experiment Videos

Effect of initial pH on aflatoxin production.

R L Buchanan, J C Ayres

    Applied Microbiology
    |December 1, 1975
    PubMed
    Summary

    Initial pH significantly impacts aflatoxin production by Aspergillus parasiticus. Optimal growth and toxin yield vary with pH, influencing the types of aflatoxins (B and G) produced.

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    Area of Science:

    • Mycology
    • Food Microbiology
    • Toxicology

    Background:

    • Aflatoxins are toxic secondary metabolites produced by Aspergillus species.
    • Aspergillus parasiticus is a significant producer of aflatoxins, posing risks to food safety.
    • Environmental factors, such as pH, can influence fungal growth and toxin production.

    Purpose of the Study:

    • To investigate the influence of initial pH on the growth and aflatoxin production of Aspergillus parasiticus NRRL 2999.
    • To determine the optimal initial pH for maximal fungal growth and aflatoxin yield.
    • To analyze the effect of pH on the specific types of aflatoxins (B and G) produced.

    Main Methods:

    • Culturing Aspergillus parasiticus NRRL 2999 in a semisynthetic medium with varying initial pH levels.
    • Measuring fungal biomass to assess growth.
    • Quantifying total aflatoxin production using analytical methods.
    • Differentiating and quantifying B and G aflatoxin types.

    Main Results:

    • Maximal fungal growth occurred at an initial pH of 5.0.
    • Maximal total aflatoxin production was observed at an initial pH of 6.0.
    • The highest aflatoxin production per unit of growth was recorded at an initial pH of 7.0.
    • Initial pH levels below 6.0 favored the production of aflatoxin B toxins.
    • Initial pH levels above 6.0 favored the production of aflatoxin G toxins.

    Conclusions:

    • Initial pH is a critical factor regulating both the quantity and type of aflatoxins produced by Aspergillus parasiticus.
    • Understanding pH-dependent production is crucial for developing strategies to control aflatoxin contamination in food and feed.
    • Specific pH ranges can be targeted to either minimize overall aflatoxin accumulation or shift the toxin profile towards less prevalent types.

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