Agroindustrial Wastes as a Support for the Immobilization of Lipase from Thermomyces lanuginosus: Synthesis of Hexyl Laurate
Résumé
As a consequence of intense industrialization in the last few decades, the amount of agroindustrial wastes has increasing, where new forms of valorization are crucial. In this work, five residual biomasses from Maranhão (Brazil) were investigated as supports for immobilization of lipase from Thermomyces lanuginosus (TLL). The new biocatalysts BM-TLL (babaçu mesocarp) and
RH-TLL (rice husk) showed immobilization efficiencies >98% and hydrolytic activities of 5.331 U g−1 and 4.608 U g−1, respectively, against 142 U g−1 by Lipozyme® TL IM. High esterification activities were also found, with 141.4 U g−1 and 396.4 U g−1 from BM-TLL and RH-TLL, respectively, against 113.5 U g−1 by TL IM. Results of porosimetry, SEM, and BET demonstrated BM and RH supports are mesoporous materials with large hydrophobic area, allowing a mixture of hydrophobic adsorption and confinement, resulting in hyperactivation of TLL. These biocatalysts were applied in the produc-
tion of hexyl laurate, where RH-TLL was able to generate 94% conversion in 4 h. Desorption with
Triton X-100 and NaCl confirmed that new biocatalysts were more efficient with 5 times less protein
than commercial TL IM. All results demonstrated that residual biomass was able to produce robust
and stable biocatalysts containing immobilized TLL with better results than commercial preparati
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