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  • Title: 1H-NMR analysis of water mobility in cultured phototrophic biofilms.
    Author: Di Pippo F, Bohn A, Cavalieri F, Albertano P.
    Journal: Biofouling; 2011 Mar; 27(3):327-36. PubMed ID: 21424947.
    Abstract:
    The present work reports on the first attempt to study water mobility in phototrophic biofilms, applying the (1)H-NMR relaxometry technique to closely monitored microbial communities grown in a microcosm under controlled ambient conditions. Longitudinal water proton relaxation times exhibited a bi-exponential behavior in all biofilm samples, indicating two types of water molecules with diverging dynamic properties, confined to different compartments of the biofilm. The fast-relaxing component can be attributed to water molecules tightly bound to the intracellular matrix, while the slow-relaxing component could reflect the behavior of water embedded in the biopolymer matrix, confined into matrix pores and channels. The results are discussed with respect to a possible key role of exopolysaccharides and uronic acids in water binding in phototrophic biofilms.
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