title: Efficient Degumming of Rice Bran Oil by Immobilized PLA1fromThermomyces lanuginosus.
abstract: Phospholipase A1(PLA1) immobilized in calcium alginate can effectively overcome the mass transfer resistance at the lipid-water interface making more room for the enzyme to separate itself from the products of reaction and to bind with the next available molecule at the interface. The reaction of an immobilized PLA1hydrolase fromThermomyces lanuginosuswas comparatively faster than of its free form. The rate of phospholipid hydrolysis by PLA1was studied in calcium-rich and calcium-depleted environments; and the extent of phosphorus removed from the crude rice bran oil as well as the amount of free fatty acids produced during the reaction were used as indices for analysing the rate of enzymatic hydrolysis under standard conditions of pH, temperature, time of incubation and agitation. The immobilized PLA1was found to be superior in removing phosphorus in the presence of 10 mM bivalent calcium ions in a solution. As compared to a maximum of 72.52% phosphorus removed by 0.01 kg of free enzyme per kg of oil, the same amount of immobilized PLA1removed phosphorus from oil by 94.12% under the same experimental conditions (pH=6, 60 °C, 1-hour incubation). Both the free PLA1and its immobilized form had shown extended rates of hydrolysis in a calcium-rich environment. The mass fractions of free fatty acids produced by the free enzyme and by its immobilized form were 14.9 and 14.16%, respectively, under the above experimental conditions. The removal of phosphorus from oil was accompanied by a significant reduction in colour and restoration of iodine value to the desired level.
authors.affiliation: Department of Food Technology, Haldia Institute of Technology, P. O. HIT, Hatiberia, Purba Medinipur, 721657 Haldia, West Bengal, India.
authors.forename: Tripti
authors.initials: T
authors.lastname: Singhania
authors.affiliation: Department of Food Technology, Haldia Institute of Technology, P. O. HIT, Hatiberia, Purba Medinipur, 721657 Haldia, West Bengal, India.
authors.forename: Harsh
authors.initials: H
authors.lastname: Sinha
authors.affiliation: Department of Food Technology, Haldia Institute of Technology, P. O. HIT, Hatiberia, Purba Medinipur, 721657 Haldia, West Bengal, India.
authors.forename: Paulomi
authors.initials: P
authors.lastname: Das
authors.affiliation: Department of Food Technology, Haldia Institute of Technology, P. O. HIT, Hatiberia, Purba Medinipur, 721657 Haldia, West Bengal, India.
authors.forename: Amit Kumar
authors.initials: AK
authors.lastname: Mukherjee
keywords: Thermomyces lanuginosus; degumming; immobilization; phospholipase A1; phospholipids; rice bran oil