Abstract
Mesophilic and thermophilic strains of actinomycetes were grown on media containing graminaceous xylan or lignocellulose. Aliquots of the culture fluids were sampled and assayed for enzyme activities involved in the degradation of hemicellulose. Xylanase, acetyl esterase and α-arabinofuranosidase activities could be detected after different times of incubation; their production was also dependent on the growth medium. The highest levels of xylanase activity were found in cultures of strains of Streptomyces, Actinomadura sp. and Saccharomonospora viridis. Streptomyces cyaneus produced the highest amount of arabinofuranosidase whereas acetyl esterase activities were highest in S. cyaneus, S. viridis and Pseudonocardia thermophila.
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