title: Effect of pulsed electric fields on the activity of neutral trehalase from beer yeast and RSM analysis.
abstract: The trehalase activity plays an important role in extraction of trehalose from beer yeast. In this study, the effect of pulsed electric field processing on neutral trehalase activity in beer yeast was investigated. In order to develop and optimize a pulsed electric field (PEF) mathematical model for activating the neutral trehalase, we have investigated three variables, including electric field intensity (10-50 kV/cm), pulse duration (2-10 μs) and liquid-solid ratio (20-50 ml/g) and subsequently optimized them by response surface methodology (RSM). The experimental data were fitted to a second-order polynomial equation and profiled into the corresponding contour plots. Optimal condition obtained by RSM is as follows: electric field intensity 42.13 kV/cm, liquid-solid ratio 30.12 ml/g and pulse duration 5.46 μs. Under these conditions, with the trehalose decreased 8.879 mg/L, the PEF treatment had great effect on activating neutral trehalase in beer yeast cells.
authors.affiliation: Laboratory of Nutrition and Functional Food, Jilin University, Changchun, PR China.
authors.forename: Haiqing
authors.initials: H
authors.lastname: Ye
authors.forename: Yan
authors.initials: Y
authors.lastname: Jin
authors.forename: Songyi
authors.initials: S
authors.lastname: Lin
authors.forename: Mingyuan
authors.initials: M
authors.lastname: Liu
authors.forename: Yi
authors.initials: Y
authors.lastname: Yang
authors.forename: Meishuo
authors.initials: M
authors.lastname: Zhang
authors.forename: Ping
authors.initials: P
authors.lastname: Zhao
authors.forename: Gregory
authors.initials: G
authors.lastname: Jones
mesh_terms: D004560:Electricity; D004789:Enzyme Activation; D014198:Trehalase / Q000737:chemistry*; D014199:Trehalose / Q000737:chemistry; D015003:Yeasts / Q000737:chemistry* / Q000378:metabolism
chemical_list: D014199:Trehalose; D014198:Trehalase