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                <title xml:lang="en">From Ecology to Biotechnology, Study of the Defense Strategies of Algae and Halophytes (from Trapani Saltworks, NW Sicily) with a Focus on Antioxidants and Antimicrobial Properties</title>
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                <title level="j">International Journal of Molecular Sciences</title>
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                <term xml:lang="en">cystoseira</term>
                <term xml:lang="en">radical-scavenging activity</term>
                <term xml:lang="en">polyphenols</term>
                <term xml:lang="en">phenolic composition</term>
                <term xml:lang="en">lipid oxidation</term>
                <term xml:lang="en">defenses</term>
                <term xml:lang="en">Cystoseira foeniculacea</term>
                <term xml:lang="en">crude extracts</term>
                <term xml:lang="en">brown alga</term>
                <term xml:lang="en">Halocnemum strobilaceum</term>
                <term xml:lang="en">biodimar</term>
                <term xml:lang="en">antifouling</term>
                <term xml:lang="en">marine-bacteria</term>
                <term xml:lang="en">ACL</term>
                <term xml:lang="en">anti-oxidants</term>
                <term xml:lang="en">anti-microbial</term>
                <term xml:lang="en">antifouling activities</term>
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              <p>This study aimed at the characterization of the antioxidant power of polyphenol extracts (PE) obtained from the algae Cystoseira foeniculacea (CYS) (Phaeophyta) and from the halophyte Halocnemum strobilaceum (HAL), growing in the solar saltworks of western Sicily (Italy), and at the evaluation of their anti-microfouling properties, in order to correlate these activities to defense strategies in extreme environmental conditions. The antioxidant properties were assessed in the PE based on the total antioxidant activity test and the reducing power test; the anti-microfouling properties of the two PE were evaluated by measuring the growth inhibition of marine fish and shellfish pathogen bacteria as well as marine surface fouling bacteria and microalgae exposed to the fractions. Similar polyphenol content (CYS 5.88 +/- 0.75 and HAL 6.03 +/- 0.25 mg gallic acid equivalents (GAE) g(-1) dried weight, DW) and similar reducing power percentage (93.91 +/- 4.34 and 90.03 +/- 6.19) were recorded for both species, even if they exhibited a different total antioxidant power (measured by the percentage of inhibition of the radical 2,2 diphenyl-1-picrylhydrazyl DPPH), with CYS (79.30) more active than HAL (59.90). Both PE showed anti-microfouling properties, being inhibitors of adhesion and growth of marine fish and shellfish pathogen bacteria (V. aestuarianus, V. carchariae, V. harveyi, P. elyakovii, H. aquamarina) and fouling bacteria (V. natriegens, V. proteolyticus, P. iirgensii, R. litoralis) with minimum inhibitory concentrations comparable to the commercial antifouling products used as a positive control (SEA-NINE 211N). Only CYS was a significant inhibitor of the microalgae strains tested, being able to reduce E. gayraliae and C. closterium growth (MIC 10 mu gmL(-1)) and the adhesion of all three strains tested (E. gayraliae, C. closterium and P. purpureum), suggesting its promise for use as an antifouling (AF) product.</p>
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