Selection of Culture Conditions and Cell Morphology for Biocompatible Extraction of β-Carotene from Dunaliella salina |
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| Authors: | Guillaume Tanguy Aline Legat Olivier Gonalves Luc Marchal Benoît Schoefs |
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| Institution: | 1.Laboratoire GEPEA, Université de Nantes, Oniris, UMR 6144, 44600 Saint-Nazaire, France; (G.T.); (A.L.); (O.G.); (L.M.);2.Metabolism, Bio-Engineering of Microalgal Molecules and Applications, Laboratoire Mer Molécules Santé, IUML–FR 3473 CNRS, Le Mans Université, Avenue Olivier Messiaen, 72085 Le Mans, France |
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| Abstract: | Biocompatible extraction emerges recently as a means to reduce costs of biotechnology processing of microalgae. In this frame, this study aimed at determining how specific culture conditions and the associated cell morphology impact the biocompatibility and the extraction yield of β-carotene from the green microalga Dunaliella salina using n-decane. The results highlight the relationship between the cell disruption yield and cell volume, the circularity and the relative abundance of naturally permeabilized cells. The disruption rate increased with both the cell volume and circularity. This was particularly obvious for volume and circularity exceeding 1500 µm3 and 0.7, respectively. The extraction of β-carotene was the most biocompatible with small (600 µm3) and circular cells (0.7) stressed in photobioreactor (30% of carotenoids recovery with 15% cell disruption). The naturally permeabilized cells were disrupted first; the remaining cells seems to follow a gradual permeabilization process: reversibility (up to 20 s) then irreversibility and cell disruption. This opens new carotenoid production schemes based on growing robust β-carotene enriched cells to ensure biocompatible extraction. |
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| Keywords: | microalgae Dunaliella salina β -carotene in situ extraction milking biocompatibility photobioreactor |
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