Morphology of <Emphasis Type="Italic">Penicillium funiculosum</Emphasis> During Biodegradation of Poly (β-hydroxybutyrate-co-β-hydroxyvalerate) [PHBV] with Poly (ε-Caprolactone) [PCL] Blends |
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Authors: | Berenice Vergara-Porras Jorge Noel Gracida-Rodríguez Fermín Pérez-Guevara |
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Institution: | 1.Biotechnology and Bioengineering Department,CINVESTAV-IPN,Mexico City,Mexico;2.Biotechnology Department,Universidad Politécnica de Pachuca,Zempoala,Mexico |
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Abstract: | Blends of poly (β-hydroxybutyrate-co-β-hydroxyvalerate) with poly (ε-caprolactone) were produced using melt mixing and solvent
casting techniques. The biodegradation of blends was tested based in the ASTM G21-90 using Penicillium funiculosum fungal specie. The CO2 production during biodegradation was measured and fitted using the Gompertz model. Biodegradation of blends varies according
to the mixing technique and the proportion of bacterial polymers in the blends. Although lag phase was larger, solvent-casted
blends were easier to degrade due to their porous surface and relative lower crystallinity. P. funiculosum morphology during biodegradation appeared to be related to carbon availability i.e. larger and more complex conidiophores,
more phialides per conidiophore and the presence of double-phialides, were found in blends with higher PHAs proportion. P. funiculosum morphology was independent to the blending technique used. Hence, morphology of P. funiculosum could be useful as a reference for carbon bioavailability of the blends. |
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