Continuous nanosecond pulsed electric field treatments foster the upstream performance of Chlorella vulgaris-based biorefinery concepts. (December 2019)

• Record Type: Journal Article
• Authors: Haberkorn, Iris; Buchmann, Leandro; Hiestand, Michèle; Mathys, Alexander
• Is Part Of: Bioresource technology. Volume 293(2019)
• Publication Date: 2019-12
• Subjects: Microalgae -- Nanosecond pulsed electric field -- Chlorella vulgaris -- Growth stimulation -- Flow cytometry; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2019.122029
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: Technology-based upstream performance improvement for microalgae biorefineries. nsPEF increased the Chlorella vulgaris biomass yield by up to 17.53 ± 10.46%. Chlorella vulgaris cell count was determined by flow cytometry. Growth stimulation was based on intracellular and plasma membrane-related effects. Abstract: Nanosecond pulsed electric field treatment (nsPEF) is an innovative, technology-driven, and resource-efficient approach to foster the upstream performance of microalgae-based biorefinery concepts to transform microalgae into economic more viable raw materials for the biobased industry. A processing window applying three treatments of 100 ns, 5 Hz, and 10 kV cm −1 to industrially relevant phototrophic Chlorella vulgaris in the early exponential growth phase significantly increased biomass yields by up to 17.53 ± 10.46% ( p = 3.18 × 10 −5 ). Treatments had limited effects on the carbon and pigment contents, but the protein content was decreased. The longest possible pulse width (100 ns) resulted in the highest biomass yield indicating underlying working mechanisms of enhanced cell proliferation based on intracellular and plasma membrane-related effects. The applicability to eukaryotes and prokaryotes, such as C. vulgaris and cyanobacteria highlights the possible impacts of nsPEF across multiple domains of the biobased industry relying on single-cell-based value-chains.