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INHIBITION OF GROWTH AND MYCOTOXIN PRODUCTION IN A TARO-BASED FOOD PRODUCT (BINAGOL, CINNAMON, POTASSIUM-SORBATE, NATAMYCIN, AFLATOXIN)
Abstract
Cinnamon did not significantly reduce mold growth nor aflatoxin production in yeast extract sucrose (YES) broth at pH 5.0 and 6.5. Sorbate alone at 2500 ug/ml and sorbate at 1250 ug/ml with 2400 ug/ml cinnamon completely inhibited growth and aflatoxin production by Aspergillus parasiticus NRRL 2999 in YES broth at pH 5.0. Subinhibitory concentrations of these inhibitors stimulated aflatoxin production. Synergism was observed when sorbate and natamycin were used together. However, this effect was reduced when cinnamon was present. Rice paste supported higher production of aflatoxin, penicillic acid and ochratoxin A, but less patulin production than binagol. Higher amounts of toxin were generally obtained at 25 C than at 15 C. The three A. parasiticus cultures usually produced the same amount of aflatoxin regardless of the substrate. A. flavus NRRL 6555 produced higher amounts of B1 than A. flavus NRRL 13003. Greater growth was observed on taro and taro + coconut milk than on rice, but the reverse was true of aflatoxin production/mg mycelia in these substrates. Modified binagol (pH 5.5) was organoleptically similar to the original (pH 6.3). The natamycin-sorbate synergism was also observed in modified binagol, extending the shelf life to >21 days. Growth of A. parasiticus in glucose ammonium nitrate broth was greatest at the highest glucose concentration and the lower caseine concentrations. Aflatoxin production was highest at lower glucose concentrations in combination with casein at all concentrations. No trend was observed with various glucose:casein combinations; high glucose to low casein concentrations did not necessarily favor aflatoxin production.
Subject Area
Food science
Recommended Citation
PALOMAR, LUTGARDA SALARES, "INHIBITION OF GROWTH AND MYCOTOXIN PRODUCTION IN A TARO-BASED FOOD PRODUCT (BINAGOL, CINNAMON, POTASSIUM-SORBATE, NATAMYCIN, AFLATOXIN)" (1986). ETD collection for University of Nebraska-Lincoln. AAI8614469.
https://digitalcommons.unl.edu/dissertations/AAI8614469