title: A kinetic study on sesame cake protein hydrolysis by Alcalase.
abstract: In the present study, the hydrolysis of sesame cake protein was performed by Alcalase, a bacterial protease produced by Bacillus licheniformis, to investigate the reaction kinetics of sesame cake hydrolysis and to determine decay and product inhibition effects for Alcalase. The reactions were carried out for 10 min in 0.1 L of aqueous solutions containing 10, 15, 20, 25, and 30 g protein/L at various temperature and pH values. To determine decay and product inhibition effects for Alcalase, a series of inhibition experiments were conducted with the addition of various amounts of hydrolysate. The reaction kinetics was investigated by initial rate approach. The initial reaction rates were determined from the slopes of the linear models that fitted to the experimental data. The kinetic parameters, K(m) and V(max), were estimated as 41.17 g/L and 9.24 meqv/L x min. The Lineweaver-Burk plots showed that the type of inhibition for Alcalase determined as uncompetitive, and the inhibition constant, K(i), was estimated as 38.24% (hydrolysate/substrate mixture). Practical Application: Plant proteins are increasingly being used as an alternative to proteins from animal sources to perform functional roles in food formulation. Knowledge of the kinetics of the hydrolysis reaction is essential for the optimization of enzymatic protein hydrolysis and for increasing the utilization of plant proteins in food products. Therefore, in the present study, the hydrolysis of sesame cake protein was performed by Alcalase, a bacterial protease produced by B. licheniformis, to investigate the reaction kinetics of sesame cake hydrolysis and to determine decay and product inhibition effects for Alcalase.
authors.affiliation: Dept. of Chemical Engineering, Yıldız Technical Univ., Davutpaşa Campus, 34210, Esenler/Istanbul, Turkey.
authors.forename: Elçin
authors.initials: E
authors.lastname: Demirhan
authors.forename: Dilek Kılıç
authors.initials: DK
authors.lastname: Apar
authors.forename: Belma
authors.initials: B
authors.lastname: Özbek
mesh_terms: D001407:Bacillus / Q000201:enzymology; D001426:Bacterial Proteins / Q000378:metabolism; D005511:Food Handling / Q000379:methods; D005525:Food-Processing Industry / Q000191:economics; D006358:Hot Temperature; D006863:Hydrogen-Ion Concentration; D006868:Hydrolysis; D007220:Industrial Waste / Q000032:analysis / Q000191:economics; D007700:Kinetics; D009994:Osmolar Concentration; D014674:Plant Proteins, Dietary / Q000191:economics / Q000378:metabolism*; D011492:Protein Hydrolysates / Q000494:pharmacology; D055314:Seed Storage Proteins / Q000191:economics / Q000378:metabolism; D012639:Seeds / Q000737:chemistry*; D015842:Serine Proteinase Inhibitors / Q000494:pharmacology; D031685:Sesamum / Q000737:chemistry*; D013381:Subtilisins / Q000037:antagonists & inhibitors / Q000378:metabolism*
chemical_list: D001426:Bacterial Proteins; D007220:Industrial Waste; D014674:Plant Proteins, Dietary; D011492:Protein Hydrolysates; D055314:Seed Storage Proteins; D015842:Serine Proteinase Inhibitors; D013381:Subtilisins