title: Lipase-Catalyzed Baeyer-Villiger Oxidation of Cellulose-Derived Levoglucosenone into (S)-γ-Hydroxymethyl-α,β-Butenolide: Optimization by Response Surface Methodology.
abstract: Cellulose-derived levoglucosenone (LGO) has been efficiently converted into pure (S)-γ-hydroxymethyl-α,β-butenolide (HBO), a chemical platform suited for the synthesis of drugs, flavors and antiviral agents. This process involves two-steps: a lipase-catalyzed Baeyer-Villiger oxidation of LGO followed by an acid hydrolysis of the reaction mixture to provide pure HBO. Response surface methodology (RSM), based on central composite face-centered (CCF) design, was employed to evaluate the factors effecting the enzyme-catalyzed reaction: pka of solid buffer (7.2-9.6), LGO concentration (0.5-1 M) and enzyme loading (55-285 PLU.mmol(-1)). Enzyme loading and pka of solid buffer were found to be important factors to the reaction efficiency (as measured by the conversion of LGO) while only the later had significant effects on the enzyme recyclability (as measured by the enzyme residual activity). LGO concentration influences both responses by its interaction with the enzyme loading and pka of solid buffer. The optimal conditions which allow to convert at least 80% of LGO in 2 h at 40°C and reuse the enzyme for a subsequent cycle were found to be: solid buffer pka = 7.5, [LGO] = 0.50 M and 113 PLU.mmol(-1) for the lipase. A good agreement between experimental and predicted values was obtained and the model validity confirmed (p < 0.05). Alternative optimal conditions were explored using Monte Carlo simulations for risk analysis, being estimated the experimental region where the LGO conversion higher than 80% is fulfilled at a specific risk of failure.
authors.affiliation: Chaire Agro-Biotechnologies Industrielles, AgroParisTechReims, France; UMR GENIAL, AgroParisTech, Institut National de la Recherche Agronomique, Université Paris-SaclayMassy, France.
authors.forename: Andreia R S
authors.initials: AR
authors.lastname: Teixeira
authors.affiliation: Chaire Agro-Biotechnologies Industrielles, AgroParisTechReims, France; UMR 1318 IJPB, AgroParisTech, Institut National de la Recherche Agronomique, Université Paris-SaclayVersailles, France.
authors.forename: Amandine L
authors.initials: AL
authors.lastname: Flourat
authors.affiliation: Chaire Agro-Biotechnologies Industrielles, AgroParisTechReims, France; UMR 1318 IJPB, AgroParisTech, Institut National de la Recherche Agronomique, Université Paris-SaclayVersailles, France.
authors.forename: Aurelien A M
authors.initials: AA
authors.lastname: Peru
authors.affiliation: Chaire Agro-Biotechnologies Industrielles, AgroParisTechReims, France; UMR 1318 IJPB, AgroParisTech, Institut National de la Recherche Agronomique, Université Paris-SaclayVersailles, France.
authors.forename: Fanny
authors.initials: F
authors.lastname: Brunissen
authors.affiliation: Chaire Agro-Biotechnologies Industrielles, AgroParisTechReims, France; UMR 782 GMPA, AgroParisTech, Institut National de la Recherche Agronomique, Université Paris-SaclayThiverval-Grignon, France.
authors.forename: Florent
authors.initials: F
authors.lastname: Allais
keywords: Bayer-Villiger bio-oxidation; enzymatic reaction; levoglucosenone; lipase; reaction optimization; response surface methodology