Steel corrosion is a global issue that affects safety and the economy. Currently, the homopolysaccharide (HoPS) structure of a novel lactic acid bacterium (LAB) is under study, as well as its application as a green corrosion inhibitor. Weissella cibaria FMy 2-21-1 is a LAB strain capable of producing HoPS in sucrose enriched media. The isolated and purified HoPS was characterized by different spectroscopic analyses as a linear α-1,6 dextran adopting a random coil conformation, with high molecular weight and extended size in water. The polysaccharide showed a semi-crystalline organization, which is a requirement for film formation. Its biocoating showed a grainy network structure, with a slightly lesser hydrophobic role in the aqueous environment than in the ionic one. The electrochemical measurements of the steel-HoPS coating showed that the biopolymer layer acts as an anodic-type corrosion inhibitor, with high resistance to corrosion by water and with chloride ions which prevent pitting, a corrosion process typical of bare steel. Few reports have cited the application of LAB HoPS as corrosive coating inhibitors. This work is the first to explore the influence of a structurally characterized dextran from Weissella cibaria strain as a potential steel corrosion inhibitor in ionic environments.

Lactic acid bacteria, LAB, biocoating, corrosion inhibitor, HoPS structure, Weissella cibaria

NCBI PubMed ID: 35594939
Publication DOI: 10.1016/j.ijbiomac.2022.05.105
Journal NLM ID: 7909578
Publisher: Butterworth-Heinemann
Correspondence: mitorinocerela.org.ar
Institutions: Centro de Referencia para Lactobacilos (CERELA)-CCT CONICET NOA Sur, Batalla de Chacabuco 145, San Miguel de Tucumán 4000, Tucumán, Argentina, Instituto de Química del Noroeste Argentino (INQUINOA) - Universidad Nacional de Tucumán (UNT) - CCT CONICET NOA Sur, Instituto de Química Física, Facultad de Bioquímica, Química y Farmacia, UNT, Batalla de Ayacucho 471, San Miguel de Tucumán 4000, Tucumán, Argentina, BIOFORGE (Group for Advanced Materials and Nanobiotechnology), University of Valladolid, CIBER-BBN, Valladolid, Spain
Methods: 13C NMR, 1H NMR, NMR-2D, UV, CD, statistical analysis, Congo Red assay, AFM, XRD, DLS, SLS, FT-R, SERS, electrochemical measurements
 

• Compound ID: 219
  

  -6)-a-D-Glcp-(1-

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  Structure type: homopolymer
  Trivial name: glucan, α-D-glucan, dextran, α-1,6-glucan, α-(1,6)-glucan, dextran, α-(1,6)-glucan, α-1,6 dextran, β-1,3-D-glucan, polysaccharide IOP
  Compound class: EPS, O-polysaccharide, cell wall polysaccharide, glucan, polysaccharide
  Reference(s) to other database(s): GTC:G69605LY, GlycomeDB:2461
  
   
  
  Weissella cibaria FMy 2-21-1
  CSDB ID 8503 (all data & tools)