Use of materials based on fatty acids with aliph. chains of more than 20 carbon atoms, in the form or free acids or of the corresponding triglycerides, as a carbon source for the prodn. by biosynthesis, by means of microorganisms of the Pseudomonas genus, of medium chain length poly(3-hydroxyalkanoates). Very long chain fatty acids (VLCFA), longer than C20, have been employed for the prodn. of medium chain length poly(3-hydroxyalkanoates) (mcl-PHA) by Pseudomonas aeruginosa. In order to keep the prodn. costs low, Brassica carinata oil (erucic acid content 35-48%) has been employed as the intact triglyceride contg. VLCFA. As free fatty acids erucic acid (C22:1) and nervonic acid (C24:1) have been employed. The 3-hydroxyacids making up the repeating units of such polymers are satd. and unsatd., with a higher content of the latter in the case of PHAs obtained from B. carinata oil. The PHAs from erucic and nervonic acids are partially cryst., with rubbery characteristics and a m.p. (Tm) of 50°, while the increase of unsatn. degree in the repeating units of PHA from B. carinata oil affords a totally amorphous material, with a glass transition temp. (Tg) of -47°.

Produzione di Plastica Biodegradabile da Olio di Brassica Carinata ad Alto Contenuto di Acido Erucico e da Acidi Grassi a Catena Molto Lunga

BALLISTRERI, Alberto;
2008

Abstract

Use of materials based on fatty acids with aliph. chains of more than 20 carbon atoms, in the form or free acids or of the corresponding triglycerides, as a carbon source for the prodn. by biosynthesis, by means of microorganisms of the Pseudomonas genus, of medium chain length poly(3-hydroxyalkanoates). Very long chain fatty acids (VLCFA), longer than C20, have been employed for the prodn. of medium chain length poly(3-hydroxyalkanoates) (mcl-PHA) by Pseudomonas aeruginosa. In order to keep the prodn. costs low, Brassica carinata oil (erucic acid content 35-48%) has been employed as the intact triglyceride contg. VLCFA. As free fatty acids erucic acid (C22:1) and nervonic acid (C24:1) have been employed. The 3-hydroxyacids making up the repeating units of such polymers are satd. and unsatd., with a higher content of the latter in the case of PHAs obtained from B. carinata oil. The PHAs from erucic and nervonic acids are partially cryst., with rubbery characteristics and a m.p. (Tm) of 50°, while the increase of unsatn. degree in the repeating units of PHA from B. carinata oil affords a totally amorphous material, with a glass transition temp. (Tg) of -47°.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11769/115183
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