Journal
POLYMERS
Volume 14, Issue 19, Pages -Publisher
MDPI
DOI: 10.3390/polym14194226
Keywords
Cupriavidus necator B-10646; gamma-valerolactone; biomass concentration; content and composition of copolymers; P(3HB-co-3HV-co-4HV); physicochemical properties; films; surface properties
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Funding
- State Assignment of the Ministry of Science and Higher Education of the Russian Federation [0287-2021-0025]
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The synthesis of P(3HB-co-3HV-co-4HV) copolymers by Cupriavidus necator B-10646 using fructose or sodium butyrate as the main C-substrate with the addition of gamma-valerolactone as a precursor of 3HV and 4HV monomers was studied. The physicochemical properties of the copolymers and films were analyzed using various methods, showing changes depending on the proportions of monomers.
Synthesis of P(3HB-co-3HV-co-4HV) copolymers by the wild-type strain Cupriavidus necator B-10646 on fructose or sodium butyrate as the main C-substrate with the addition of gamma-valerolactone as a precursor of 3HV and 4HV monomers was studied. Bacterial cells were cultivated in the modes that enabled production of a series of copolymers with molar fractions of 3HV (from 7.3 to 23.4 mol.%) and 4HV (from 1.9 to 4.7 mol.%) with bacterial biomass concentration (8.2 +/- 0.2 g/L) and PHA content (80 +/- 2%). Using HPLC, DTA, DSC, X-Ray, SEM, and AFM, the physicochemical properties of copolymers and films prepared from them have been investigated as dependent on proportions of monomers. Copolymers are characterized by a reduced degree of crystallinity (C-x 38-49%) molecular weight characteristics M-n (45-87 kDa), and M-w (201-248 kDa) compared with P(3HB). The properties of the films surface of various composition including the porosity and surface roughness were studied. Most of the samples showed a decrease in the average pore area and an increase in their number with a total increase in 3HV and 4HV monomers. The results allow scaling up the productive synthesis of P(3HB-co-3HV-co-4HV) copolymers using Cupriavidus necator B-10646.
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