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Concurrent Quantification of Cellular and Extracellular Components of Biofilms
Published on: December 10, 2013
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Correlative Effects on Nanoplastic Aggregation in Model Extracellular Biofilm Substances Investigated with
Tobias Guckeisen1, Rozalia Orghici1, Silke Rathgeber1
1Institute for Integrated Natural Sciences, Physics Department, University of Koblenz, Universitätsstraße 1, 56070 Koblenz, Germany.
Polymers
|August 10, 2024
Summary
Nanoplastics aggregate and sediment due to interactions with biofilm substances, affecting pollutant transport. Understanding these complex interactions, like pH effects on nanoplastic-biofilm aggregation, is crucial for environmental risk assessment.
Area of Science:
- Environmental Science
- Biophysics
- Materials Science
Background:
- Biofilm substances significantly influence nanoplastic aggregation and sedimentation, impacting environmental pollutant fate.
- Climate change, such as surface water acidification, can alter nanoplastic-biofilm interactions.
- Understanding these interactions is vital for assessing the risks of nanoplastic pollution.
Purpose of the Study:
- To investigate the pH-dependent aggregation of non-functionalized polystyrene nanoparticles (NPs) with model extracellular biofilm substances.
- To elucidate the role of bovine serum albumin (BSA) and alginate in nanoplastic aggregation.
- To assess the influence of biomolecule concentrations and ionic strength on NP aggregation.
Main Methods:
- Utilized fluorescence correlation spectroscopy (FCS) to study NP aggregation.
- Employed a model biofilm system comprising bovine serum albumin (BSA) and alginate in Na+ solutions.
- Investigated varying biomolecule concentrations (0.5–21 g/L) under freshwater ionic strength conditions.
Main Results:
- BSA promotes NP aggregation via adsorption and bridging.
- Alginate addition generally hampers NP aggregation, likely through BSA-alginate complex formation.
- NP aggregation is primarily driven by pH-independent depletion forces in most BSA-alginate mixtures, with alginate's stabilizing effect diminishing at high BSA concentrations.
Conclusions:
- Correlative effects between multiple biofilm components are critical for accurately understanding nanoplastic aggregation.
- Single-component biofilm models may lead to misjudgments of nanoplastic stability and aggregation behavior.
- Accurate risk assessment requires considering complex, multi-component biofilm interactions with nanoplastics.
