Covalently immobilized lipase catalyzing high-yielding optimized geranyl butyrate synthesis in a batch and fluidized bed reactor

[Display omitted] ► Covalently stablized and highly active Candida rugosa lipase was used for statistical modeling of geranyl butyrate synthesis. ► Optimized reaction conditions enabled high-yielding production of targeted ester. ► Using the same catalyst, geranyl butyrate synthesis was optimized in...

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Bibliographic Details
Published in:	Journal of molecular catalysis. B, Enzymatic Vol. 75; pp. 50 - 59
Main Authors:	Damnjanović, Jasmina J., Žuža, Milena G., Savanović, Jova K., Bezbradica, Dejan I., Mijin, Dušan Ž., Bošković-Vragolović, Nevenka, Knežević-Jugović, Zorica D.
Format:	Journal Article
Language:	English
Published:	Amsterdam Elsevier B.V 01-03-2012 Elsevier
Subjects:	batch systems Bioconversions. Hemisynthesis Biological and medical sciences Biotechnology butyrates butyric acid Candida rugosa catalytic activity Covalent immobilization Enzymatic esterification epoxides esterification Fluidized bed reactor fluidized beds Fundamental and applied biological sciences. Psychology geraniol Geranyl butyrate immobilized enzymes Methods. Procedures. Technologies Optimization study polymers statistical analysis temperature Fluidized bed reactor Geranyl butyrate FBR CRL Covalent immobilization Enzymatic esterification CCRD Optimization study Enzyme Immobilization Triacylglycerol lipase Esterases Esterification Optimization Carboxylic ester hydrolases Butyrate Batchwise Covalent bond Hydrolases Enzymatic reaction
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Summary:	[Display omitted] ► Covalently stablized and highly active Candida rugosa lipase was used for statistical modeling of geranyl butyrate synthesis. ► Optimized reaction conditions enabled high-yielding production of targeted ester. ► Using the same catalyst, geranyl butyrate synthesis was optimized in fluidized bed reactor, as one being potentially used in industry. ► Optimized synthesis in fluidized bed reactor enabled high yielding, stable and kinetically improved ester production. Three commercially available polymers (Sepabeads ® EC-EP, Sepabeads ® EC-HA and Purolite ® A-109) were tested for potential application as supports for covalent immobilization of lipase from Candida rugosa by analyzing some critical properties of immobilized enzymes such as enzyme loading, activity and activity immobilization yield. Among them, lipase covalently immobilized on Sepabeads ® EC-EP via epoxy groups appeared to show the best performance in a standard hydrolytic reaction. Therefore, it was selected and assayed in the esterification of butyric acid and geraniol to produce geranyl butyrate, first in a batch system followed by continuous geranyl butyrate synthesis in a fluidized bed reactor, as one being potentially applicable for large-scale production. Based on statistical analysis, optimal conditions for the production of geranyl butyrate by selected, immobilized lipase in the batch system are recommended as: temperature at 25–30 °C, water concentration at 3.6% (v/v) and acid/alcohol molar ratio at 2.5. A set of optimal conditions for the ester synthesis in a fluidized bed reactor system has also been determined, specifically, flow rate at 10 mL min −1, temperature at 35 °C, water concentration at 2% (v/v), substrate concentration at 0.1 M and acid/alcohol ratio at 2.0. Implementation of the optimized parameters in a batch system and in a fluidized bed reactor enabled production of target ester with high molar conversion, at > 99.9% for 48 h in the batch process, and 78.9% for 10 h in fluidized bed reactor. Although when assayed at their optimal conditions, lower molar conversion was achieved in the fluidized bed reactor system compared to the batch system, the volumetric productivity in fluidized bed reactor was more than five fold higher than that obtained in the batch system.
Bibliography:	http://dx.doi.org/10.1016/j.molcatb.2011.11.009
ISSN:	1381-1177 1873-3158
DOI:	10.1016/j.molcatb.2011.11.009