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- Title
Glass bead system to study mycotoxin production of Aspergillus spp. on corn and rice starches.
- Authors
Inotai, Katalin; Bata-Vidács, Ildikó; Tóth, Ákos; Kosztik, Judit; Varga, Mónika; Szekeres, András; Nagy, István; Dobolyi, Csaba; Mörtl, Mária; Székács, András; Kukolya, József
- Abstract
Mycotoxin production by aflatoxin B1 (AFB1) -producing Aspergillus flavus Zt41 and sterigmatocystin (ST) -hyperproducer Aspergillus creber 2663 mold strains on corn and rice starch, both of high purity and nearly identical amylose-amylopectin composition, as the only source of carbon, was studied. Scanning electron microscopy revealed average starch particle sizes of 4.54 ± 0.635 µm and 10.9 ± 2.78 µm, corresponding to surface area to volume ratios of 127 1/µm for rice starch and 0.49 1/µm for corn starch. Thus, a 2.5-fold difference in particle size correlated to a larger, 259-fold difference in surface area. To allow starch, a water-absorbing powder, to be used as a sole food source for Aspergillus strains, a special glass bead system was applied. AFB1 production of A. flavus Zt41 was determined to be 437.6 ± 128.4 ng/g and 90.0 ± 44.8 ng/g on rice and corn starch, respectively, while corresponding ST production levels by A. creber 2663 were 72.8 ± 10.0 µg/g and 26.8 ± 11.6 µg/g, indicating 3–fivefold higher mycotoxin levels on rice starch than on corn starch as sole carbon and energy sources. Key points: • A glass bead system ensuring the flow of air when studying powders was developed. • AFB1 and ST production of A. flavus and A. creber on rice and corn starches were studied. • 3–fivefold higher mycotoxin levels on rice starch than on corn starch were detected.
- Subjects
CORNSTARCH; AFLATOXINS; GLASS beads; RICE starch; ASPERGILLUS; CORN; ASPERGILLUS flavus; AIR flow; SCANNING electron microscopy
- Publication
Applied Microbiology & Biotechnology, 2024, Vol 108, Issue 1, p1
- ISSN
0175-7598
- Publication type
Article
- DOI
10.1007/s00253-024-13190-7