Bacteria associated with plants were examined for their ability to use cyclodextrins (CDs) as a unique carbon source. Among 24 strains from eight genera, Xanthomonas were the most active. The cyclodextrin decomposing ability of strains were not related to their taxonomic position. Chemical structure significantly influenced the degradability of cyclodextrins by bacteria. The less rigid ring structure of gamma-CD favoured utilization, whereas methylation led to reduced utilization.
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