engleski

Spectrofluorometric applications in studyng macroalgal exudates

In this paper we present a one-year investigation on the fluorescence characteristics of released products of selected Adriatic seaweeds. The technique chosen was UV-fluorescence spectroscopy with the synchronous mode, which involves the stepping of the excitation and emission monochromators. The five species- of representative macrophytes, Cystoseira compressa, Dictyopteris polypodioides, Gracilaria bursapastoris, Pterocladia capillacea, and Ulva rigida, were chosen on the basis of their dominance in the plant communities typical for the area near Split - Central Adriatic. Our results suggest that macroalgal-related dissolved fluorescent matter can be categorized into two distinct groups of fluoresc-ing compounds with the following excitation wavelengths: one from 320-360 nm, probably for compounds with 2 fused aromatic rings, and another from 36020 nm, corresponding with 3 & 4 fused rings. The contribution of aromatics with 2 and with 3 & 4 rings was very similar in the brown algae Cystoseira compressa and Dictyopteris polypndioides, while in the red algae Gracilaria bursapastoris and Pterocladia capillacea as well in the green alga Ulva rigida the group with 2 rings dominated.

fluorescence; macrophytes; exudates; Adriaitic Sea

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