Browsing by Subject "biogenic material"

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    Antioxidative and antimicrobial activities of some marine algae
    (2011) Çaki Z.; Öztiirk M.; Taskin E.; Taskin E.
    In the present study the antioxidant activities exhibited by the crude extracts of six marine algae collected from the Aegean Sea shores of Turkey were examined: Padina pavonica, Cystoseira barbota, and Sargassum acinarium of the Phaeophyceae (brown algae), Caulerpa racemosa var. cylindracea of the Bryopsidophyceae (green algae), and Jania longifurca and Laurencia obtusa belonging to the Rhodophyceae (red algae). Antioxidant activities were assessed by measurement of glutathion peroxidase activity spectrophotometrically and malondialdehyde measurement for lipid peroxidation by HPLC. Among the species examined, the highest antioxidative capacity according to specific glutathion peroxidase activity was measured from the extract of the brown alga Sargassum acinarium (124 U/mg protein) followed by another brown alga Padina pavonica (16.20 U/mg protein). Malondialdehyde contents of extracts as an indicator of lipid peroxidation were compared, and S. acinarium extract had the lowest MDA level (0.229 μmol/1). Antimicrobial activities of the methanolic extracts of P. pavonica, Cy. barbota, S. acinarium and J. longifurca were also evaluated against eight microorganisms (7 bacteria and a yeast strain). The extracts showed moderate inhibitory activity. © by PSP.
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    Particle size affects physical properties and antioxidant activity of unripe banana peel
    (Parlar Scientific Publications, 2020) Savlak N.; Turker B.
    Unripe banana peel flour of Dwarf Cavendish banana (Musa spp. AAA) peel (Gazipasa, Turkey) of different particle sizes (<212 μ m, 212-315 μm, 316-500 μm, 501-700 μm) were investigated for their physicochemical, functional properties and antioxidant activity and data were analyzed by SAS Statistical Programme using Completely Randomized Design Proc Glm prosedure. Particle size mostly affected L* value (60.60 - 65.03), bulk density (71.87 - 74.78 kg m"3), tapped density (294.25 - 357.29 kg m~3), wettability (1.19 - 9.72 s), antioxidant activity (159.86 - 198.57 mmol Fe (II) / g dry peel flour; 40.11 - 44.79 mg Trolox equivalent / g dry peel flour) and phenolic content (2.17- 2.64 mg GAE / g dry peel flour) of unripe banana peel flour. L* value, tapped density and wettability decreased; bulk density, water absorbtion index and oil holding capacity increased as particle size increased. Antioxidant activity (FRAP and DPPH methods) and total phenolic content of unripe banana peel flour also increased by increasing particle size. This study is the first study mentioning the effect of particle size on quality of unripe banana peel. To the best of authors' knowledge, the study also provided the first data on some handling properties of unripe banana peel flour in terms of tapped density, Hausner ratio, Carr Index and wettability. © 2020 Parlar Scientific Publications. All rights reserved.