Lipase-catalyzed synthesis of propyl-phenyl acetate: a kinetic and thermodynamic study.

This study focuses on the synthesis of propyl-phenyl acetate via esterification reaction in the presence of immobilized Candida antartica lipase-B (CAL-B). In this work, the effect of relevant factors (kinetics and thermodynamic) on total percent conversion and process optimization was studied. The reaction was performed in heptane medium with 1:2 molar ratio of benzoic acid: n-propanol with 0.

Facile fabrication of silver on magnetic nanocomposite (FeO@Chitosan -AgNP nanocomposite) for catalytic reduction of anthropogenic pollutant and agricultural pathogens.

In this work, a novel approach was developed to synthesis advance magnetic nano-catalyst; FeO@Chitosan -AgNP nanocomposite. It is made up of chitosan (fish industry-waste) doped onto the magnetic core with active silver nanoparticles on the exterior shell using NaBH as reductant and total soluble solids (dairy effluent-waste) as a stabilizing agent. TEM images confirm the average mean diameter of composed nanocatalyst about 8 ± 2.

A novel step towards immobilization of biocatalyst using agro waste and its application for ester synthesis.

This work explains the utilization of agro-waste (coconut and peanut shell) to produce mesoporous activated carbon which further utilized as a support material for lipase immobilization (Candida antarctica B, CALB). Various parameters affecting the binding of enzyme to activated carbon with high surface area (1603 m g) were optimized. Maximum 200 μg g CALB has been loaded at 40 °C and pH 6.

Ultrasound-assisted lipase catalyzed hydrolysis of aspirin methyl ester.

The ultrasound-assisted hydrolysis of aspirin methyl ester (AME) was investigated using immobilized Candida antarctica lipase B (CALB) (1%) in the presence of solvents like triolein, chloroform (CHCl) and dichloromethane (DCM). The effect of ultrasound and the role of water on the conversion rates have also been investigated. Proton nuclear magnetic resonance spectroscopic (H NMR) was chosen to calculate hydrolysis convertion rates.

Lipase-ultrasound assisted synthesis of polyesters.

Poly (ethylene glutarate), poly (ethylene malonate) and poly (ethylene phthalate), were enzymatically synthesized by immobilized Candida antarctica lipase B in solvent free conditions. The synthesis of these polyesters was based on the ester-ester exchange reaction between ethylene glycol diacetate and di-ethyl glutarate, di-benzyl malonate, di-n-octyl phthalate to produce poly (ethylene glutarate), poly (ethylene malonate) and poly (ethylene phthalate), respectively. The effect of ultrasound and PET polymeric beads was evaluated and showed to improve the synthesis of all polyesters.

Ultrasound assisted lipase catalyzed synthesis of cinnamyl acetate via transesterification reaction in a solvent free medium.

Cinnamyl acetate is known for its use as flavor and fragrance material in different industries such as food, pharmaceutical, cosmetic etc. This work focuses on ultrasound assisted lipase (Novozym 435) catalyzed synthesis of cinnamyl acetate via transesterification of cinnamyl alcohol and vinyl acetate in non-aqueous, solvent free system. Optimization of various parameters shows that a higher yield of 99.