Environmental effects on arsenosugars and arsenolipids in Ectocarpus (Phaeophyta)
作者： Ásta H. Pétursdóttir , Kyle Fletcher , Helga Gunnlaugsdóttir , Eva Krupp , Frithjof C. Küpper
DOI: 10.1071/EN14229
关键词: Ectocarpus 、 Speciation 、 Food science 、 Fluorescence spectrometry 、 Biomagnification 、 Environmental chemistry 、 Chemistry 、 Microbial biodegradation 、 Algae 、 Phosphate 、 Arsenic
摘要: Seaweeds have recently been shown to contain a significant proportion of arsenic in the form arsenolipids (AsLp). Three strains filamentous brown alga Ectocarpus species were grown laboratory with different simulationsofenvironmentalstress:controlconditions(1/2Provasoli-enrichedseawater),lownitrate(30%oftheamount ofnitratesinthecontrol),lowphosphate(30%ofthe amountofphosphateinthecontrol)andunderoxidativestresslevels (2 mM H2O2). Generally, major AsLp was an arsenic-containing hydrocarbon, AsHC360 (50-80%), but additionally, several phospholipids (AsPL) identified and quantified using high-performance liquid chroma- tography-inductivelycoupledplasmamassspectrometryandelectrosprayionisationmassspectrometry(HPLC-ICP-MS/ ESI-MS).TheAsLpsincultureswerecomparedwithAsLpsinEctocarpusfoundinitsnaturalhabitataswellaswithother algae. The arsenosugar profiles differed depending on experimental conditions. Under low phosphate conditions, reduction phosphorus-containing arsenosugars noticed, increaseofphosphate-containingAsLpswasfoundwhencomparedwiththecontrols.Strainsgrownunderoxidativestress showed increase AsLps as well clear physiological changes. Additional keywords: chloroplasts, cultures, HPLC-ESIMS, HPLC-ICP-MS, lipid-soluble arsenic, speciation. Received 25 October 2014, accepted 2 March 2015, published online 28 July 2015
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