Biosynthesis and structural characterization of biodegradable plastics from Brassica carinata oil and from very long chain fatty acids (Contributo in atti di convegno)

Type
Label
  • Biosynthesis and structural characterization of biodegradable plastics from Brassica carinata oil and from very long chain fatty acids (Contributo in atti di convegno) (literal)
Anno
  • 2011-01-01T00:00:00+01:00 (literal)
Alternative label
  • A.Ballistreri, G.Impallomeni, G.M.Carnemolla, S.P.P.Guglielmino, M.S.Nicolò, M.G.Cambri (2011)
    Biosynthesis and structural characterization of biodegradable plastics from Brassica carinata oil and from very long chain fatty acids
    in Eupoc2011 - Biobased Polymers and Related Biomaterials, Gargnano (I)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • A.Ballistreri, G.Impallomeni, G.M.Carnemolla, S.P.P.Guglielmino, M.S.Nicolò, M.G.Cambri (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#note
  • 29 May - 3 June, 2011. (Conference Proceeding -Poster) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#descrizioneSinteticaDelProdotto
  • Abstract: Agriculture and the industries connected frequently produce food surplus and byproducts that can be used as low-cost substrates in fermentation processes. One of the possible practical applications of this concept would be the production of bacterial polyesters by fermentation from such substrates, specifically the production of the biosynthetic polymers generically known as poly(hydroxyalkanoates) (PHAs)1,2. In some countries of the Mediterranean area, such as in Italy, particularly in Sicily, the production, collection, and pressing of Brassica carinata are being tested experimentally, with the aim to create a new chain of production for biofuels. The widespread and cheap production of B. carinata oil, intended for the production of biodiesel, brings about as a consequence a wide availability of said starting material at low cost, both as an alternative choice and as a means to dispose of the production surplus. Very long chain fatty acids (VLCFA), longer than C20, were employed for the production of medium chain length poly(3-hydroxyalkanoates) (mcl-PHA) by Pseudomonas aeruginosa. In order to keep the production costs low, Brassica carinata oil (erucic acid content 35 - 48%) was employed as the intact triglyceri e containing VLCFA. As free fatty acids erucic acid (C22:1) and nervonic acid (C24:1) were employed. Weight average molecular weight, determined by GPC, varied from 56000 for PHA from B. carinata oil to about 120000 for those from erucic and nervonic acids. Monomeric units composition was obtained by GC analysis, while the structural characterization was performed by 1H- and 13C-NMR. The 3-hydroxyacids making up the repeating units of such polymers were saturated and unsaturated, with a higher content of the latter in the case of PHAs obtained from B. carinata oil. ESI MS of partially pyrolysed samples allowed the identification of oligomers up to heptamers and statistical analysis of the ion intensity in the mass spectra showed that these PHAs are random copolymers. The PHAs from erucic and nervonic acids were partially crystalline, with rubbery characteristics and a melting point (Tm) of 50°C, while the increase of unsaturation degree in the repeating units of PHA from B. carinata oil afforded a totally amorphous material, with a glass transition temperature (Tg) of -47 °C. (literal)
Titolo
  • Biosynthesis and structural characterization of biodegradable plastics from Brassica carinata oil and from very long chain fatty acids (literal)
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