Incubation time after pulsed electric field treatment of microalgae enhances the efficiency of extraction processes and enables the reduction of specific treatment energy

Bioresource Technology
Aude SilveW Frey

Abstract

Pulsed Electric Field (PEF) pre-treatment, applied on fresh microalgae Auxenochlorella protothecoides, induces spontaneous release of a substantial water fraction and enables subsequent lipid extraction using ethanol-hexane blends. In this study, fresh microalgae suspensions were treated with PEF and incubated under inert conditions. Incubation promotes the release of ions and carbohydrates and increases the yields of subsequent lipid extraction thus enabling a considerable reduction of PEF-treatment energy. With a 20 h incubation period at 25 °C, almost total lipid extraction is achieved with a specific PEF-treatment energy of only 0.25 MJ/kgDW. Incubation on ice remains beneficial but less efficient than at 25 °C. Additionally, incubating microalgae cells in suspension at 100gDW/L or in a dense paste, was almost equally efficient. Correlation between the different results suggests that spontaneous release of ions and carbohydrates facilitates more successful lipid extraction. A direct causality between the two phenomena remains to be demonstrated.

Citations

Oct 6, 2020·Frontiers in Bioengineering and Biotechnology·Olga GorteAude Silve
Sep 10, 2020·Frontiers in Bioengineering and Biotechnology·Diederich Aguilar-MachadoJavier Raso
Jan 23, 2021·Critical Reviews in Food Science and Nutrition·Vaileth TimiraSiddanakoppalu N Pramod
Dec 17, 2020·Comprehensive Reviews in Food Science and Food Safety·Juan M MartínezJavier Raso
Aug 28, 2021·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Muhammad Modassar A N RanjhaRana Muhammad Aadil

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