Abstract
Turbinaria ornata (TO) extract was tested as green corrosion inhibitor on mild steel (MS) coupons in conc. HCl medium with an efficiency of 100% at 25 g l−1 during 5 min exposure. Antibacterial efficacy performed against 16 S rDNA identified marine biofilming bacteria (MBB) and human pathogenic bacteria (HPB). Maximum inhibition growth was 16 mm on MBB observed in Bacillus megaterium (MBF14 - AB894827) and 20 mm on HPB in Escherichia coli (B5 - NCIM 2931). Similarly, minimum of 10 mm on MBB witnessed in Pseudomonas sp., (MBF9 - AB894829). Toxicity studies proved 50.0% LC50 at 500 μg ml−1 in 24 hrs, whereas Balanus amphitrite resulted in 100% mortality within 12 hrs. Results including weight loss, potentiodynamic polarization and electrochemical impedance spectroscopy, FT-IR and GC-MS confirm 10-Octadecaonic acid as a major corrosion inhibitor from T. ornata and is discovered as a novel antifoulant. Anticorrosion formulation will become available soon.
Highlights
MBB were collected from the air-seawater interface at the bottom hull of a fishing vessel berthed at Tuticorin harbour located at the ocean front in the new harbour area of the Gulf of Mannar, southeast coast of India
From the mixture, the bacterial strains were isolated by the spread plating method on selective medium plates with common (10−4, 10−5, 10−6 and etc.) dilutions[42]
Numbers of visible colonies counted after 48 hrs of incubation in the order of magnitude above 104 CFUs cm−2 (CFUs Colony Forming Units)
Summary
The aim of the present work is to investigate the antifouling/anticorrosion as well as antibacterial activity of three different solvent extractions of ten different seaweeds
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