Microbial flora and quality of coffee (Coffea arabica L.) stored whole for different periods
Coffees of the cultivar Catuai Vermelho were harvested on the Matao Farm situated on the Mg-179 highway, 10 km away from Alfenas, Minas Gerais, Brazil. The coffee was harvested and submitted to the drying process on a flat open terrace until they reached adequate moisture (11-13 percent). Afterwards, the fruits in coco were placed into oakum bags of 60 kg each and carried to a conventional warehouse for storage. The experimental design was completely randomized consisting of eight treatments (0, 90, 180, 20, 360, 540 and 630 days' storage) and five replicates with a 60 kg bag per replicate. After each storage time, 2 kg of fruits in coco per replicate were withdrawn, a part was processed and taken to the laboratory where chemical, sensorial and microbiological analyses (fruit and grains) were performed. Distinct behaviours concerning some chemical components and microbial composition were observed in the different storage times. The weight of 100 grains, moisture content and ash fraction presented no definite trend of variation while the crude fibre and crude protein contents presented a growing increase in storage times. The beverage based on the cup test showed there is a difference among the times, with hard beverage in the six first months and riado/rio in the others, differing from the classification based upon the polyphenol oxidase [catechol oxidase] activity which pointed out beverage only soft in the first six months of storage and hard beverage in the others. As to the microbial composition, in the coco fruits the fungi of the genera Fusarium sp. presented a decreasing trend, Penicillium sp., Aspergillus sp. and Cladosporium sp. increased their infection with storage time. But in the grains of these processed fruits, Fusarium sp. and Cladosporiumsp. decreased, Aspergillus sp. increased and Penicillium sp. did not range with rising storage time.
| Main Authors: | , , |
|---|---|
| Format: | biblioteca |
| Published: |
2002
|
| Subjects: | COFFEA, COFFEA ARABICA, FUSARIUM, PENICILLIUM, ASPERGILLUS, CLADOSPORIUM, CENIZA, CATECOL OXIDASA, CAFE, CALIDAD, RENDIMIENTO DE CULTIVOS, FIBRA CRUDA, PROTEINA BRUTA, ACTIVIDAD ENZIMATICA, ENZIMAS, FRUTAS, CONTAMINACION BIOLOGICA, FLORA MICROBIANA, CONTENIDO DE HUMEDAD, CONTENIDO PROTEICO, PESO DE LAS SEMILLAS, ANALISIS ORGANOLEPTICO, ENFERMEDADES POSTCOSECHA, |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|