Background and Objective: Production of polyhydroxyalkanoate copolyesters consisting of 3-hydroxybutyrate and 3-hydroxyvalerate units was for the first time studied using the production strain Hydrogenophaga pseudoflava based on sustainable raw materials. This strategy provides for increased cost efficiency in PHA production and in enhanced material quality.
Material and Methods: As a particularity, production of these poly(3-hydroxybutyrate-co-3- hydroxyvalerate) copolyesters was based on a novel substrate/co-substrate combination: whey permeate from dairy industry, on the one hand, acted as substrate for biomass and 3HB biosynthesis; on the other hand, levulinic acid, accessible from various renewable resources, was used as 3HV-related precursor compound. The experiments were carried out on shaking flask scale using defined nutrient media.
Results and Conclusion: Applied during nutritionally balanced growth of H. pseudoflava, levulinicacid displays drastic growth inhibition at rather low concentrations of 0.2 g l-1 (growth inhibition constant Ki = 0.032), which suggests the careful supply of this compound in the first phase of cultivation. Under nitrogen-free cultivation conditions, inhibition of the strain´s metabolism by levulinic acid was less pronounced. Here, poly(3-hydroxybutyrate-co- 3-hydroxyvalerate) concentrations up to 4.2 g l-1 and volumetric poly(3-hydroxybutyrate-co-3- hydroxyvalerate) productivities up to 0.06 g l-1 h -1 were achieved in dependence on the precursor supply. Investigating poly(3-hydroxybutyrate-co-3-hydroxyvalerate) composition in setups supplied with differently composed whey/levulinic acid mixtures revealed 3- hydroxyvalerate fractions in the polymer between 0 and 0.6 mol mol-1 . This study successfully demonstrates the feasibility of combined utilization of different waste- and by-products from food industry and agriculture for generation of value-added 2nd generation biopolymers.
Conflict of interest: The authors declare no conflict of interest.
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