A comparison of the character of algal extracellular versus cellular organic matter produced by cyanobacterium, diatom and green alga

0422041 - ÚH 2017 RIV GB eng J - Článek v odborném periodiku
Pivokonský, Martin - Šafaříková, Jana - Barešová, Magdalena - Pivokonská, Lenka - Kopecká, Ivana
A comparison of the character of algal extracellular versus cellular organic matter produced by cyanobacterium, diatom and green alga.
Water Research. Roč. 51, March (2014), s. 37-46. ISSN 0043-1354. E-ISSN 1879-2448
Grant CEP: GA AV ČR IAA200600902
Institucionální podpora: RVO:67985874
Klíčová slova: Algal organic matter * Extracellular organic matter * Cellular organic matter * Peptide/protein content * Hydrophobicity * Molecular weight fractionation
Obor OECD: Environmental sciences (social aspects to be 5.7)
Impakt faktor: 5.528, rok: 2014
http://www.sciencedirect.com/science/article/pii/S004313541301021X

This study investigated characteristics of algal organic matter (AOM) derived from three species (cyanobacterium Microcystis aeruginosa, diatom Fragilaria crotonensis and green alga Chlamydomonas geitleri) which dominate phytoplanktonic populations in reservoirs supplying drinking water treatment plants. Algal growth was monitored by cell counting, optical density and dissolved organic carbon concentration measurements. Extracellular organic matter (EOM) released at exponential and stationary growth phases and cellular organic matter (COM) were characterised in terms of specific UV absorbance (SUVA), peptide/protein and non-peptide content, hydrophobicity and molecular weight (MW). It was found that both EOM and COM were predominantly hydrophilic with low SUVA. COM was richer in peptides/proteins, more hydrophilic (with about 89 % of hydrophilic fraction for all three species) and had lower SUVA than EOM. MW fractionation showed that both EOM and COM of all three species contain large portions of low-MW (< 1 kDa) compounds and high-MW (> 100 kDa) polysaccharides. Peptides/proteins exhibited narrower MW distribution than non-peptide fraction and it widened as the cultures grew. The highest amount of peptides/proteins with a significant portion of high-MW ones (22 %) was observed in COM of M. aeruginosa. The results imply that the knowledge of AOM composition and characteristics predetermine which processes would be effective in the treatment of AOM laden water.
Trvalý link: http://hdl.handle.net/11104/0230445