Rational Guidelines for the Two‐Step Scalability of Enzymatic Polycondensation: Experimental and Computational Optimization of the Enzymatic Synthesis of Poly(glycerolazelate). Issue 9 (8th April 2022)

• Record Type: Journal Article
• Authors: Todea, Anamaria; Fortuna, Sara; Ebert, Cynthia; Asaro, Fioretta; Tomada, Stefano; Cespugli, Marco; Hollan, Fabio; Gardossi, Lucia
• Is Part Of: ChemSusChem. Volume 15:Issue 9(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-04-08
• Subjects: biocatalysis -- carboxylic acids -- lipases -- oligoesters -- polycondensation; Green chemistry -- Periodicals; Sustainable engineering -- Periodicals; Chemistry -- Periodicals; Chemical engineering -- Periodicals; 660
• DOI: 10.1002/cssc.202102657
• Languages: English
• ISSNs: 1864-5631

Abstract

Abstract: The lipase‐catalyzed polycondensation of azelaic acid and glycerol is investigated according to a Design‐of‐Experiment approach that helps to elucidate the effect of experimental variables on monomer conversion, M n and regioselectivity of acylation of glycerol. Chemometric analysis shows that after 24 h the reaction proceeds regardless of the presence of the enzyme. Accordingly, the biocatalyst was removed after a first step of synthesis and the chain elongation continued at 80 °C. That allowed the removal of the biocatalyst and the preservation of its activity: pre‐requites for efficient applicability at industrial scale. The experimental study, combined with docking‐based computational analysis, provides rational guidelines for the optimization of the regioselective acylation of glycerol. The process is scaled up to 73.5 g of monomer. The novelty of the present study is the rigorous control of the reaction conditions and of the integrity of the immobilized biocatalyst, which serve to avoiding any interference of free enzyme or fines released in the reaction mixture. The quantitative analysis of the effect of experimental conditions and the overcoming of some major technical bottlenecks for the scalability of enzymatic polycondensation opens new scenarios for industrial exploitation. Abstract : Two steps to scalability : A solvent‐free system is demonstrated for the two‐step synthesis of azelaic acid‐based oligoesters. The enzyme is removed after the first reaction step and chain elongation continues at 80 °C. This method permits the removal of the biocatalyst and the preservation of its activity, both of which are prerequisites for efficient applicability at industrial scale.