ArticleFrontiers in microbiology2022
Preservation of exopolymeric substances in estuarine sediments.
Article in Frontiers in microbiology, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 5 papers.
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Who cites it
5 citing papers in PubMed.
- Soil pH Amelioration Synergizes Carbon Accrual with Yield Gains Under Organic Substitution.Advanced science (Weinheim, Baden-Wurttemberg, Germany) · 2026Article
- Imaging of biofilms using cryo-scanning electron microscopy.Essays in biochemistry · 2026Review
- Article
- Green starch nanoparticles production in situ using α-amylase from a newly isolated Bacillus subtilis strain-MA6: statistical designs and characterizations.Microbial cell factories · 2025Article
- An astrobiological perspective on microbial biofilms: their importance for habitability and production of detectable and lasting biosignatures.Applied and environmental microbiology · 2025Review
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Authors and funding
12 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
The surface of intertidal estuarine sediments is covered with diatom biofilms excreting exopolymeric substances (EPSs) through photosynthesis. These EPSs are highly reactive and increase sediment cohesiveness notably through organo-mineral interactions. In most sedimentary environments, EPSs are partly to fully degraded by heterotrophic bacteria in the uppermost millimeters of the sediment and so they are thought to be virtually absent deeper in the sedimentary column. Here, we present the first evidence of the preservation of EPSs and EPS-mineral aggregates in a 6-m-long sedimentary core obtained from an estuarine point bar in the Gironde Estuary. EPSs were extracted from 18 depth intervals along the core, and their physicochemical properties were characterized by (i) wet chemical assays to measure the concentrations of polysaccharides and proteins, and EPS deprotonation of functional groups, (ii) acid-base titrations, and (iii) Fourier transform infrared spectroscopy. EPS-sediment complexes were also imaged using cryo-scanning electron microscopy. EPS results were analyzed in the context of sediment properties including facies, grain size, and total organic carbon, and of metabolic and enzymatic activities. Our results showed a predictable decrease in EPS concentrations (proteins and polysaccharides) and reactivity from the surface biofilm to a depth of 0.5 m, possibly linked to heterotrophic degradation. Concentrations remained relatively low down to
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