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Article Dans Une Revue Carbohydrate Polymers Année : 2019

Microalgae starch-based bioplastics: Screening of ten strains and plasticization of unfractionated microalgae by extrusion

Résumé

Microalgae were considered in this work as a new resource for developing starch-based bioplastics. Ten green microalgae strains were screened at lab-scale for their ability to produce starch. A long run (800 h) two-stage accumulation strategy was designed with successive cultivation in sulfur-replete, then sulfur-depleted medium in autotrophic conditions. Starch content was assessed on cell lysate by enzymatic digestion of extracted starch into glucose. Chlamydomonas reinhardtii 11-32A strain was selected as it displayed a maximum starch-to-biomass ratio of 49% w/w, 460 h after being switched to a sulfur-deprived medium. Small-scale pilot production (30 L tubular photobioreactor) with C. reinhardtii 11-32A yielded sufficient biomass quantity to investigate its direct plasticization with glycerol in a twin-screw extruder. Microstructural characterization confirmed the ability for starch-enriched microalgae to be homogeneously plasticized, and hence the possibility to use microalgae as a new platform for the development of bioplastics.
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Dates et versions

hal-02425058 , version 1 (26-02-2020)

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Charlie Mathiot, Pauline Ponge, Benjamin Gallard, Jean-Francois Sassi, Florian Delrue, et al.. Microalgae starch-based bioplastics: Screening of ten strains and plasticization of unfractionated microalgae by extrusion. Carbohydrate Polymers, 2019, 208, pp.142-151. ⟨10.1016/j.carbpol.2018.12.057⟩. ⟨hal-02425058⟩
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