Production of Surface Active Organic Material and Reduced Sulfur Species During the Growth of Marine Diatom Cylindrotheca closterium

Ciglenečki-Jušić, Irena; Dautović, Jelena; Cvitešić Kušan, Ana; Pletikapić, Galja (2018) Production of Surface Active Organic Material and Reduced Sulfur Species During the Growth of Marine Diatom Cylindrotheca closterium. Croatica Chemica Acta, 91 (4). pp. 455-461. ISSN 0011-1643

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Official URL: https://hrcak.srce.hr/217781

Abstract

Electrochemical methods at the mercury electrode were used for monitoring production of surface active substances (SAS) and reduced sulfur species (RSS) during growth of marine diatom Cylindrotheca closterium isolated from the Adriatic Sea in the laboratory conditions. In the same culture samples, production of particulate and dissolved organic carbon (POC, DOC) was followed by high temperature catalytic oxidation method (HTCO). The culture growth curve obtained by microscopically counted phytoplankton cells showed an exponential growth phase that lasted 10 days, transition phase until 14 days and stationary phase until 21 days. In these time periods twofold increase of SAS and DOC was followed, while POC increased 41 times. Detail analyses of a.c. out of phase voltammetric curves recorded in original and in acidified phytoplankton culture samples indicate transformation of organic material during growth, from more anionic (negatively charged) to less anionic polymeric surface active material. In culture samples presence of non-volatile RSS were confirmed.

Item Type:

Article

Uncontrolled Keywords:

a. c. voltammetry ; surface active substances ; phytoplankton exudates ; Cylindrotheca closterium ; DOC ; POC ; reduced sulfur species

Subjects:

NATURAL SCIENCES > Chemistry

Divisions:

Division for Marine and Enviromental Research

Projects:

Project title	Project leader	Project code	Project type
Kruženje sumpora i ugljika u morskom i slatkovodnom okolišu-SPHERE	Irena Ciglenečki-Jušić	IP-2013-11-1205	HRZZ
Rogozničko morsko jezero kao model odziva ekosustava na promjene u okolišu-MARRES	Irena Ciglenečki-Jušić	IP-2018-01-1717	HRZZ

Depositing User:

Irena Ciglenečki-Jušić

Date Deposited:

23 Jul 2019 09:18

URI:

http://fulir.irb.hr/id/eprint/4909

DOI:

10.5562/cca3433