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1 Department of Systems Biology, Technical University of Denmark 2 Natural Product Chemistry, Department of Systems Biology, Technical University of Denmark 3 Food Technology Institute 4 Assicafé Assessoria e Consultoria Agrícola Ltda 5 Fungal Chemodiversity, Department of Biotechnology and Biomedicine, Technical University of Denmark 6 State University of Campinas
Fungi are known producers of a large number of volatile compounds (VCs). Several VCs such as 2,4,6 trichloroanisole (TCA), geosmin and terpenes have been found in coffee beverages, and these compounds can be responsible for off-flavor development. However, few studies have related the fungal contamination of coffee with the sensory characteristics of the beverage. The aim of this research was to investigate the production of VCs by fungi isolated from coffee and their potential as modifiers of the sensory coffee beverage quality. Three species were isolated from coffee from the southwest of São Paulo state and selected for the study: Penicillium brevicompactum, Aspergillus luchuensis (belonging to section Nigri) and Penicillium sp. nov. (related to Penicillium crustosum). VCs produced by the fungal inoculated in raw coffee beans were extracted and tentatively identified by SPME-GC-MS. Different VCs that may interfere in the coffee beverage quality were detected in the raw coffee beans inoculated with these fungal species (mainly A. luchuensis). Oct-1-en-3-ol was detected in the raw coffee inoculated with A. luchuensis. This compound, which is characterized by earthy and moldy/mushroom aroma, can be related to negative characteristics of coffee beverage in sensory analysis. On the other hand, the presence of some fungal species in the coffee, even at a high percentage of infection, did not necessarily result in loss of the sensorial quality of the beverage, since the samples with a high infection of P. brevicompactum showed positive sensory evaluation. © 2014 Elsevier Ltd.
Food Research International, 2014, Vol 64, p. 166-170
Fungal volatiles; Coffee; GC/MS; Sensorial analyses; Beverages; Chemical analysis; Flavor compounds; Sensory perception; Volatile organic compounds; 2 ,4 ,6-Trichloroanisole; Fungal contamination; Penicillium brevicompactum; Sensorial analysis; Sensorial qualities; Sensory characteristics; Fungi
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