Transformation of Enzymatic Hydrolysates of Chlorella–Fungus Mixed Biomass into Poly(hydroxyalkanoates)

The production of poly(hydroxylalkanoates) (PHA) is limited by the high cost of the feedstock since various biomass wastes look attractive as possible sources for polymer production. The originality of this present study is in the biotransformation of mixed Chlorella-based substrates into PHAs. The synthetic potential of Cupriavidus necator B8619 cells was studied during the bioconversion of algae biomass in mixtures with spent immobilized mycelium of different fungi (genus Rhizopus and Aspergillus) into PHAs. The biomass of both microalgae Chlorella and fungus cells was accumulated due to the use of the microorganisms in the processes of food wastewater treatment. The biosorption of Chlorella cells by fungal mycelium was carried out to obtain mixed biomass samples (the best ratio of “microalgae:fungi” was 2:1) to convert them by C. necator B8619 into the PHA. The influence of conditions used for the pretreatment of microalgae and mixed types of biomass on their conversion to PHA was estimated. It was found that the maximum yield of reducing sugars (39.4 ± 1.8 g/L) can be obtained from the mechanical destruction of cells by using further enzymatic hydrolysis. The effective use of the enzymatic complex was revealed for the hydrolytic disintegration of treated biomass. The rate of the conversion of mixed substrates into the biopolymer (440 ± 13 mg/L/h) appeared significantly higher compared to similar known examples of complex substrates used for C. necator cells.

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