Comparison of Different Latex Fractions of Carica Papaya L., and Novozyme 435® in the Methanolysis of Canola Oil

The activity of crude (P3) and protease-free (CPL-p) fractions of latex from Carica papaya in the lipolysis and methanolysis of canola oil were investigated. P3 and CPL-p fractions were extracted from C. papaya fruits collected in the department of Atlantico (Colombia), obtaining extraction yields of 26.89 ± 0.26 and 4.85 ± 0.04 g/100 g of fresh latex, respectively. The lipase activity of the CPL-p, determined by titration of the fatty acids was 58.4% greater than P3. Both fractions were evaluated as catalysts in the production of fatty acid methyl esters (FAME). The lipase B from Candida antarctica (Novozyme 435®) was used as a reference catalyst. All reactions were carried out in a batch-type bioreactor for 48 h, at 200 rpm and 50 oC. The conditions of reaction with P3 and CPL-p were: 6 g oil, 20 %w/w n-hexane, 15 %w/w catalyst, methanol/oil molar ratio of 3:1. The conversions obtained were: P3 = 31.55 ± 1.01 %, CPL-p = 38.48 ± 0.76 % and Novozyme 435 = 62.96 ± 0.63 %. These results demonstrate the potential of CPL-p for the hydrolysis of vegetable oils used in the food industry. However, under the experimental conditions used in the present study, its application in the production of FAME is limited. It is concluded that the latex of the papaya´s fruit, from the trees that are grown in the Colombian Caribbean region, is an agroindustrial by-product with a high potential in lipid bioconversion.