Ochratoxin A contamination of coffee batches from Kenya in relation to cultivation methods and post-harvest processing treatments
2010
Duris, Daniel | Mburu, Joseph K. | Durand, Noel | Clarke, Renata | Frank, John M. | Guyot, Bernard
This study set out to assess the relative importance of sound and unsound beans in a batch of coffee with regard to ochratoxin A (OTA) contamination. Initially, unsound beans were found to account for 95% of contamination in a batch of coffee, whatever the methods used for post-harvest processing. It was also found that beans displaying traces of attacks by Colletotrichum kahawae were the greatest contributors to OTA contamination. In a second stage, the study compared the contamination of sound beans with that of beans attacked by Colletotrichum kahawae. On average, beans attacked by Colletotrichum kahawae had a statistically higher OTA content than sound beans (18.0 µg kg-1 as opposed to 1.2 µg kg-1). In addition, the average OTA content in unsound beans varied depending on growing conditions.
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