In this study, the sample was taken from the same batch of coffee cherries stripped manually from the bush and containing only red cherries; a microbial ecological succession was observed.
This microbial succession was diversified and the number of individuals and species were influenced principally by the moisture content of the coffee cherries and beans (Fig. 1).
Differences in moisture content and chemical composition of the coffee also influenced competition for the substrate and, therefore, affected colonization by these microorganisms.
Thus, it is important to establish an epiphytic population of coffee cherries and beans because compounds secreted by microorganisms during their metabolism may migrate to the seed used to infuse the coffee beverage.
Coffee bean moisture can be correlated with aw and is a factor that affects the degree of colonization and the colonizing species (Magan and Lacey, 1984)
Differences in the microbial populations detected in studies on natural coffee can be explained by varying exposure times and surfaces (fermentation and drying ground) where coffee cherries are submitted to atmospheric conditions during the processing.
The exposure time varies because climatic conditions during fermentation and drying can be different in each coffee-producing area.
The Bacillus species predominated in our bacteria samples.
Thisgenus is characterized by its frequency in soils and sporulation that promotes cell survival in adverse conditions.
Some Bacillus species can produce a series of extracellular enzymes that degrade complex compounds such as cellulose and pectin (Coughlan and Mayer, 1991).
These two polymers are found in the skin, pulp and mucilage of coffee cherries, which therefore can be attacked by microbial enzymes.
The cellulolytic ability of bacillus may plexes during fermentation of coffee cherries. Isolates of the
B. cereus group (B. polymyxa and B. subtilis) were the most frequently encountered cellulolytic Bacillus species.
Species such as E. aerogenes, E. cloacae and isolates of the Klebsiella genus found in this study on natural coffee were also identified in wet-processed Robusta coffee from the Congo
(Van Pee and Castelein, 1972) and also in fresh C. arabica pulp in
Colombia; Serratia and Pseudomonas were also found (Blando´n
et al., 1998).
In this study, the sample was taken from the same batch of coffee cherries stripped manually from the bush and containing only red cherries; a microbial ecological succession was observed.
This microbial succession was diversified and the number of individuals and species were influenced principally by the moisture content of the coffee cherries and beans (Fig. 1).
Differences in moisture content and chemical composition of the coffee also influenced competition for the substrate and, therefore, affected colonization by these microorganisms.
Thus, it is important to establish an epiphytic population of coffee cherries and beans because compounds secreted by microorganisms during their metabolism may migrate to the seed used to infuse the coffee beverage.
Coffee bean moisture can be correlated with aw and is a factor that affects the degree of colonization and the colonizing species (Magan and Lacey, 1984)
Differences in the microbial populations detected in studies on natural coffee can be explained by varying exposure times and surfaces (fermentation and drying ground) where coffee cherries are submitted to atmospheric conditions during the processing.
The exposure time varies because climatic conditions during fermentation and drying can be different in each coffee-producing area.
The Bacillus species predominated in our bacteria samples.
Thisgenus is characterized by its frequency in soils and sporulation that promotes cell survival in adverse conditions.
Some Bacillus species can produce a series of extracellular enzymes that degrade complex compounds such as cellulose and pectin (Coughlan and Mayer, 1991).
These two polymers are found in the skin, pulp and mucilage of coffee cherries, which therefore can be attacked by microbial enzymes.
The cellulolytic ability of bacillus may plexes during fermentation of coffee cherries. Isolates of the
B. cereus group (B. polymyxa and B. subtilis) were the most frequently encountered cellulolytic Bacillus species.
Species such as E. aerogenes, E. cloacae and isolates of the Klebsiella genus found in this study on natural coffee were also identified in wet-processed Robusta coffee from the Congo
(Van Pee and Castelein, 1972) and also in fresh C. arabica pulp in
Colombia; Serratia and Pseudomonas were also found (Blando´n
et al., 1998).
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