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The aim of this work was to investigate the potential of PEF technology for green extraction of microalgal pigments and lipids from fresh Chlorella sorokiniana suspensions. Efficiencies of PEF treatment and different solvent systems application to C. sorokiniana were compared to efficiencies of untreated biomass extraction. Differences in chlorophyll extraction of untreated and PEF treated C. sorokiniana were only seen at short extraction times. Beneficial PEF-effect was minimised for long-time extractions of larger algae quantities where yields aligned. Extraction attempts on C. sorokiniana lipids did not show increased extractability after PEF treatment, which underlined the statement of PEF representing a rather ineffective disruption method for microalgae holding rigid cell walls.
Valuable Compounds in Algae
(2019)
In recent decades, the interest in algae species as a source of nutritive and valuable compounds has increased. This results from rising population growth, with serious effects in terms of land and water consumption, as well as greenhouse gases. Usually, extraction applications are focused on specific components, such as oil or pigments; however, conscious biorefinery of a broader spectrum of microalgal constituents would enable an increased economy. However, the technology for the production of microalgae is still within its early stages. The cultivation and downstreaming processes are highly energy- and cost-intensive, so the use of algae is limited to the production of high-value and low-volume products. Therefore, progression of environmentally friendly technologies is needed to realize an eco-friendly and economical usage of microalgae as a sustainable resource of the future. This chapter presents general overview of microalgae; moreover, origin and location of valuable compounds are discussed. Additionally, different conventional and novel (thermal and nonthermal) extraction techniques are reviewed.