Production of Alternaria mycotoxins by Alternaria alternata isolated from weather-damaged wheat

Citation
Fq. Li et al., Production of Alternaria mycotoxins by Alternaria alternata isolated from weather-damaged wheat, J FOOD PROT, 64(4), 2001, pp. 567-571
Citations number
15
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Food Science/Nutrition
Journal title
JOURNAL OF FOOD PROTECTION
ISSN journal
0362-028X → ACNP
Volume
64
Issue
4
Year of publication
2001
Pages
567 - 571
Database
ISI
SICI code
0362-028X(200104)64:4<567:POAMBA>2.0.ZU;2-V
Abstract
The production of Alternaria mycotoxins by Alternaria alternata isolated fr om Chinese weathered wheat kernels were first investigated on polished rice and durum wheat grains. These mycotoxins included alternariol (AOH) and it s monomethyl ether (AME), altenuene (ALT), altertoxin I (ATX-I), and tenuaz onic acid (TA). Of 25 isolates tested, all were AOH and AME producers, 21 ( 84%) coproduced ALT and ATX-I, and 8 (32%) produced TA in rice culture. TA was the most abundant toxin produced at a level ranging from 1.369 to 3,563 mg/kg. Much smaller amounts of AGH, AME, ALT. and ATX-I were present with average concentrations of 54, 40, 44, and 8 mg/kg, respectively. There were linear correlations between the level of AOH and AME (r = 0.846), alternar iols (AOH plus AME) and ALT (r = 0.785), and ATX-I and TA (r = 0.553). Poli shed rice medium seems to support a bit more production of Alternaria metab olites than wheat but with an insignificant difference in concentrations (P > 0.05). A study of the time-course of toxin production by A. alternata is olates indicated that AOH production began faster than any other toxins mon itored, and ALT production exhibited a progressive increase throughout the experiment.