March 28, 2017

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By Leo A Goldblatt

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Sample text

Flavus isolates was determined by Schindler et al. (1967). They reported patterns in the proportion of Bx to G1 similar to those of Diener and Davis (1966). Schindler and Eisenberg (1968) reported a shift in ratio (1 : 6) of Bx to G x occurring with A. 8) on wort agar substrate. However, the ratio of aflatoxins on wort agar after 5 days incubation at 24°C was previously illustrated as being about 1 : 6 (Schindler et al, 1967). E. Maturity Bampton (1963) noted in Nigeria that peanuts left in the ground 4 weeks after maturity contained aflatoxin.

They determined their structures and concluded that M x was hydroxyaflatoxin Bx and that M 2 was dihydrohydroxyaflatoxin B x . flavus were hydroxy derivatives of aflatoxins B 2 and G 2 , and designated them B 2 a and G 2 a . Later, they elucidated the structure and biochemical properties of aflatoxins B 2 a and G 2 a , and found them to be much less toxic to ducklings than the other aflatoxins (Dutton and Heathcote, 1968). IV. FACTORS INFLUENCING PRODUCTION OF AFLATOXIN IN NATURAL SUBSTRATES A.

Relative Humidity and Moisture It is widely recognized that the most important factor in growth and aflatoxin production by A. flavus is the moisture of or relative humidity (RH) surrounding a natural substrate (Austwick and Ayerst, 1963). The moisture limits and optima for specific fungi are similar on a variety of living, dead, and processed natural substrates, when moisture is measured in terms of hygroscopic equilibrium. Safe storage moisture content for seeds 26 URBAN L. DIENER AND NORMAN D.

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