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A method for characterization of sea surface microlayer based on monolayer properties in presence and absence of phospholipids

Gašparović, Blaženka; Frka, Sanja; Kozarac, Zlatica; Nelson, Andrew (2008) A method for characterization of sea surface microlayer based on monolayer properties in presence and absence of phospholipids. Analytica Chimica Acta, 620 (1-2). pp. 64-72. ISSN 0003-2670

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Abstract

Electrochemical impedance spectroscopy, ac voltammetry and fractal analysis were used to characterize model compounds, compound mixtures and extracted samples of sea surface microlayer (ssm) und underlying water (ulw). The reasons for carrying out this work were to use the scientific basis of these characterizations in future on-line analytical procedures of ssm. The mercury (Hg) drop electrode uncoated and coated with a monolayer of dioleoyl phosphatidylcholine (DOPC) was used as an experimental basis for investigation of the major sea surface film forming material. Firstly, the interaction of the uncoated and DOPC coated Hg electrode with model water insoluble compounds of increasing polarity was investigated. The compounds studied in order of increasing polarity were: nonadecane, stearic acid, cholesterol and cardiolipin. Subsequently the electrochemical response of the system to different ssm extracts was compared to signals observed with model compounds to demonstrate method selectivity. From the electrochemical results, it is observed that both the molecular structure and polarity of the investigated compounds have a role in their interaction with the uncoated and DOPC coated electrode. In the fractal analysis the increase above 2 of fractal dimension D imparted to the DOPC layer is related to the degree of apolarity of the additive model compound. Consistent with this, the more apolar hexane extracted ssm 2 imparts a fractal dimension D value of 2.45 when incorporated in DOPC layers. The electrochemical response to the ssm and ulw follows that characteristic of sterol compounds.

Item Type: Article
Uncontrolled Keywords: sea surface microlayer; dioleoyl phosphatidylcholine; model lipids; impedance spectroscopy; ac voltammetry; fractal analysis
Subjects: NATURAL SCIENCES > Chemistry > Analytic Chemistry
NATURAL SCIENCES > Interdisciplinary Natural Sciences > Marine Science
Divisions: Division for Marine and Enviromental Research
Projects:
Project titleProject leaderProject codeProject type
Priroda organske tvari, interakcije s mikrokonstituentima i površinama u okolišu-Irena Ciglenečki-Jušić098-0982934-2717MZOS
Depositing User: Blaženka Gašparović
Date Deposited: 21 May 2018 15:37
Last Modified: 22 May 2018 08:57
URI: http://fulir.irb.hr/id/eprint/4050
DOI: 10.1016/j.aca.2008.05.043

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