title: Ultrasound-assisted hydrolysis of waste cooking oil catalyzed by homemade lipases.
abstract: This study aimed to evaluate the waste cooking oil (WCO) hydrolysis in ultrasonic system using lipase as catalyst. Lipase was produced by the fungus Aspergillus niger via solid state fermentation (SSF) using canola meal as substrate. Prior to the hydrolysis reaction, the lipase behavior when subjected to ultrasound was evaluated by varying the temperature of the ultrasonic bath, the exposure time and the equipment power. Having optimized the treatment on ultrasound, the WCO hydrolysis reaction was carried out by evaluating the oil:water ratio and the lipase concentration. For a greater homogenization of the reaction medium, a mechanical stirrer at 170rpm was used. All steps were analyzed by experimental design technique. The lipase treatment in ultrasound generated an increase of about 320% in its hydrolytic activity using 50% of ultrasonic power for 25min. at 45°C. The results of the experimental design conducted for ultrasound-assisted hydrolysis showed that the best condition was using an oil:water ratio of 1:3 (v:v) and enzyme concentration of 15% (v/v), generating 62.67μmol/mL of free fatty acids (FFA) in 12h of reaction. Thus, the use of Aspergillus niger lipase as a catalyst for hydrolysis reaction of WCO can be considered as a possible pretreatment technique of the oil in order to accelerate its degradation.
authors.affiliation: Environmental Science and Technology, Federal University of Fronteira Sul - Campus Erechim, RS 135, Km 72, 99700-000 Erechim, RS, Brazil.
authors.forename: J
authors.initials: J
authors.lastname: Mulinari
authors.affiliation: Environmental Science and Technology, Federal University of Fronteira Sul - Campus Erechim, RS 135, Km 72, 99700-000 Erechim, RS, Brazil.
authors.forename: B
authors.initials: B
authors.lastname: Venturin
authors.affiliation: Environmental Science and Technology, Federal University of Fronteira Sul - Campus Erechim, RS 135, Km 72, 99700-000 Erechim, RS, Brazil.
authors.forename: M
authors.initials: M
authors.lastname: Sbardelotto
authors.affiliation: Environmental Science and Technology, Federal University of Fronteira Sul - Campus Erechim, RS 135, Km 72, 99700-000 Erechim, RS, Brazil.
authors.forename: A
authors.initials: A
authors.lastname: Dall Agnol
authors.affiliation: Environmental Science and Technology, Federal University of Fronteira Sul - Campus Erechim, RS 135, Km 72, 99700-000 Erechim, RS, Brazil.
authors.forename: T
authors.initials: T
authors.lastname: Scapini
authors.affiliation: Environmental Science and Technology, Federal University of Fronteira Sul - Campus Erechim, RS 135, Km 72, 99700-000 Erechim, RS, Brazil.
authors.forename: A F
authors.initials: AF
authors.lastname: Camargo
authors.affiliation: Environmental Science and Technology, Federal University of Fronteira Sul - Campus Erechim, RS 135, Km 72, 99700-000 Erechim, RS, Brazil.
authors.forename: D P
authors.initials: DP
authors.lastname: Baldissarelli
authors.affiliation: Environmental Science and Technology, Federal University of Fronteira Sul - Campus Erechim, RS 135, Km 72, 99700-000 Erechim, RS, Brazil.
authors.forename: T A
authors.initials: TA
authors.lastname: Modkovski
authors.affiliation: Environmental Science and Technology, Federal University of Fronteira Sul - Campus Erechim, RS 135, Km 72, 99700-000 Erechim, RS, Brazil.
authors.forename: V
authors.initials: V
authors.lastname: Rossetto
authors.affiliation: Environmental Science and Technology, Federal University of Fronteira Sul - Campus Erechim, RS 135, Km 72, 99700-000 Erechim, RS, Brazil.
authors.forename: C
authors.initials: C
authors.lastname: Dalla Rosa
authors.affiliation: Environmental Science and Technology, Federal University of Fronteira Sul - Campus Erechim, RS 135, Km 72, 99700-000 Erechim, RS, Brazil.
authors.forename: F W
authors.initials: FW
authors.lastname: Reichert
authors.affiliation: Environmental Science and Technology, Federal University of Fronteira Sul - Campus Erechim, RS 135, Km 72, 99700-000 Erechim, RS, Brazil.
authors.forename: S M
authors.initials: SM
authors.lastname: Golunski
authors.affiliation: Grupo de Derivados de la Industria Alimentaria, Departamento de Ciencia y Tecnología de Alimentos (CYTAL), Facultad de Química, Universidad de la República (UdelaR), Montevideo, Uruguay.
authors.forename: I
authors.initials: I
authors.lastname: Vieitez
authors.affiliation: Environmental Science and Technology, Federal University of Fronteira Sul - Campus Erechim, RS 135, Km 72, 99700-000 Erechim, RS, Brazil.
authors.forename: G D L P
authors.initials: GDLP
authors.lastname: Vargas
authors.affiliation: Environmental Science and Technology, Federal University of Fronteira Sul - Campus Erechim, RS 135, Km 72, 99700-000 Erechim, RS, Brazil.
authors.forename: C
authors.initials: C
authors.lastname: Dalla Rosa
authors.affiliation: Environmental Science and Technology, Federal University of Fronteira Sul - Campus Erechim, RS 135, Km 72, 99700-000 Erechim, RS, Brazil.
authors.forename: A J
authors.initials: AJ
authors.lastname: Mossi
authors.affiliation: Environmental Science and Technology, Federal University of Fronteira Sul - Campus Erechim, RS 135, Km 72, 99700-000 Erechim, RS, Brazil. Electronic address: helentreichel@gmail.com.
authors.forename: H
authors.initials: H
authors.lastname: Treichel
mesh_terms: D001234:Aspergillus niger / Q000201:enzymology; D055162:Biocatalysis; D003296:Cooking; D006868:Hydrolysis; D008049:Lipase / Q000378:metabolism*; D009821:Oils / Q000737:chemistry*; D000069453:Ultrasonic Waves; D014866:Waste Products
chemical_list: D009821:Oils; D014866:Waste Products; D008049:Lipase
keywords: Aspergillus niger; Hydrolysis; Lipase; Ultrasound; Waste cooking oil