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Title: Marine Bacteria Associated with Colonization and Alteration of Plastic Polymers
Authors: Carrasco Acosta, Marina 
Santos García, Marta
García Jiménez, M. Del Pilar 
UNESCO Clasification: 251001 Oceanografía biológica
330811 Control de la contaminación del agua
331210 Plásticos
Keywords: Bacteria
In Vitro Colonization
Plastic Polymer
Issue Date: 2022
Journal: Applied Sciences (Basel) 
Abstract: The aim of this work was molecular identification of bacteria associated with marine sand at the drift line, where most plastic debris is deposited, and evaluation of the alteration of plastic polymers by them. Bacterial communities growing on plastic polymer surfaces may differentially cause surface alteration through exopolysaccharide production. This alteration can be analyzed by changes in spectra regions of colonized polymers compared to uncolonized polymers using Fourier Transform Infrared Spectroscopy (FTIR). In this study, bacteria located in sand at the drift line above sea water, where microplastics are most abundant, were isolated and identified through 16S rRNA. Six of the identified species produced exopolysaccharides, namely Bacillus thuringiensis, B. cereus, Bacillus sp. Proteus penneri, Alcaligenes faecalis and Myroides gitamensis. These bacteria species were inoculated into plates, each containing two frequently reported types of polymers at the drift line. Specifically, the two types of plastic polymers used were polypropylene and polystyrene spheres in whole and mechanically crushed states. Differences in bacterial growth were reported as inferred from weight increase of polypropylene and polystyrene spheres after 1-year long culture. Results also showed that Alcaligenes faecalis, Bacillus cereus and Proteus penneri colonized polypropylene spheres and modified spectra regions of FTIR. It is concluded that bacteria located in sand can be considered plastic-altering bacteria as changes in FTIR-spectra of polymers can be related to bioalteration.
ISSN: 2076-3417
DOI: 10.3390/app122111093
Source: Applied Sciences (Switzerland) [EISSN 2076-3417], v. 12 (21), (Noviembre 2022)
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