Mycotoxins, ergosterol, and odor volatiles in durum wheat during granary storage at 16% and 20% moisture content
Eleven-kilogram parcels of durum wheat ( Triticum durum L. cv. Melita) at 16% and 20% initial moisture content (m.c.) were kept in storage in a Manitoba farm granary for 20 weeks (May–September 2000) to determine changes in storage quality indicators and mycotoxin production. Temperature, moisture,...
Saved in:
Published in | Journal of stored products research Vol. 41; no. 1; pp. 67 - 76 |
---|---|
Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
Oxford
Elsevier Ltd
2005
Elsevier Science |
Subjects | |
Online Access | Get full text |
Cover
Loading…
Summary: | Eleven-kilogram parcels of durum wheat (
Triticum durum L. cv. Melita) at 16% and 20% initial moisture content (m.c.) were kept in storage in a Manitoba farm granary for 20 weeks (May–September 2000) to determine changes in storage quality indicators and mycotoxin production. Temperature, moisture, CO
2 levels, ergosterol content, odor volatiles, microfloral infection, and levels of major mycotoxins were monitored. Ochratoxin A and citrinin reached mean levels of 6.5 and 11.6
mg/kg, respectively, by 20 weeks at 20% m.c., but were absent at 16% m.c., and no other mycotoxins were found.
Penicillium species were the predominant microflora. Ergosterol levels remained between 3.9 and 8.4
mg/kg at 16% m.c., but increased from 3.9 to 55.5
mg/kg at 20% m.c. during the 20-week trial period. A 12-element metal-oxide chemosensor array was used to monitor odor volatile evolution. Nine of the 12 sensors were able to track odor volatile changes at 20% and could consistently distinguish between volatiles from the two moisture treatments. Signals from these nine chemosensors showed a good correlation with ochratoxin A formation at 20% m.c. with
r values between 0.84 and 0.87. Signals from two of these nine sensors also correlated well with citrinin formation (
r=0.83) and very well with ergosterol production (
r=0.98). |
---|---|
Bibliography: | ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 |
ISSN: | 0022-474X 1879-1212 |
DOI: | 10.1016/j.jspr.2003.11.002 |