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10.3390/w15010111
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Communication

Composition of Colloidal Organic Matter in Phytoplankton Exudates

by
Katja Klun
1,*,
Primož Šket
2,
Alfred Beran
3,
Ingrid Falnoga
4 and
Jadran Faganeli
1
1
Marine Biology Station, National Institute of Biology, Fornace 41, 6330 Piran, Slovenia
2
Slovenian NMR Centre, National Institute of Chemistry, Hajdrihova 19, 1000 Ljubljana, Slovenia
3
National Institute of Oceanography and Applied Geophysics, Via A. Piccard 54, 34151 Trieste, Italy
4
Department of Eviron. Sciences, Jozef Stean Institute, Jamova 39, 1000 Ljubljana, Slovenia
*
Author to whom correspondence should be addressed.
Water 2023, 15(1), 111; https://doi.org/10.3390/w15010111
Submission received: 30 November 2022 / Revised: 15 December 2022 / Accepted: 26 December 2022 / Published: 29 December 2022
(This article belongs to the Special Issue Characterization of Organic Matter in Marine and Freshwater Environment)
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Abstract

The colloidal organic matter (COM) was isolated from the exudates of three cultured phytoplonkters, namely the chlophyte nanoflagellate Tetraselmis sp., the diatom Chaetoceros socialis and the dinoflagellate Prorocentrum minimum, from the Gulf of Trieste (northern Adriatic Sea). The isolation of COM was performed by ultrafiltration with molecular weight cut-off membranes of 5 kDa and final desalinisation by dialysis. The composition of the COM was characterised using C elemental analysis and 1H NMR spectroscopy and compared with COM isolated from a marine sample from the same area (Gulf of Trieste). By using 1H NMR spectroscopy, it was possible to semi-quantitatively determine the concentrations of the main biochemical constituents present in the COM samples. The results showed that the phytoplankton COM was predominantly composed of polysaccharides, with minor contributions from proteins and especially lipids. Therefore, the phytoplankton COM mainly contributes to the marine COM pool in the polysaccharide fraction and less in the protein and lipid fractions.
Keywords: colloidal organic matter; phytoplankton exudates; NMR spectroscopy; chemical composition; northern Adriatic Sea colloidal organic matter; phytoplankton exudates; NMR spectroscopy; chemical composition; northern Adriatic Sea

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MDPI and ACS Style

Klun, K.; Šket, P.; Beran, A.; Falnoga, I.; Faganeli, J. Composition of Colloidal Organic Matter in Phytoplankton Exudates. Water 2023, 15, 111. https://doi.org/10.3390/w15010111

AMA Style

Klun K, Šket P, Beran A, Falnoga I, Faganeli J. Composition of Colloidal Organic Matter in Phytoplankton Exudates. Water. 2023; 15(1):111. https://doi.org/10.3390/w15010111

Chicago/Turabian Style

Klun, Katja, Primož Šket, Alfred Beran, Ingrid Falnoga, and Jadran Faganeli. 2023. "Composition of Colloidal Organic Matter in Phytoplankton Exudates" Water 15, no. 1: 111. https://doi.org/10.3390/w15010111

APA Style

Klun, K., Šket, P., Beran, A., Falnoga, I., & Faganeli, J. (2023). Composition of Colloidal Organic Matter in Phytoplankton Exudates. Water, 15(1), 111. https://doi.org/10.3390/w15010111

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