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Main Title: The impact of lipases on the rheological behavior of colloidal silica nanoparticle stabilized Pickering emulsions for biocatalytical applications
Author(s): Heyse, Anja
Kraume, Matthias
Drews, Anja
Type: Article
Abstract: The use of Pickering emulsions for biocatalytical applications has recently received increased attention in cases where hydrophobic reactants are involved. For process applications, knowledge of the emulsion’s rheology is crucial for the fluid dynamical design of equipment and selection of operating conditions. Colloidal silica nanoparticle stabilized Pickering emulsions usually exhibit shear-thinning behavior caused by a complex particle-particle network. While this has been observed by many authors, no publication has yet dealt with the rheology of silica nanoparticle stabilized Pickering emulsions containing enzymes. Thus, the aim of this study was to investigate the impact of the commonly used biocatalyst lipase (type and concentration), the dispersed phase volume fraction and the silica particle concentration on the rheological behavior of water-in-oil Pickering emulsions. For this purpose, the impact of the named parameters on the viscosity curves were measured. Lipases reduced the viscosities and transferred the rheological behavior from shear-thinning to Newtonian, which might be due to interactions of the lipase molecules via the formation of intermolecular disulfide bonds, which disturb the hydrogen-bond based silica particle-particle network. However, by increasing the dispersed phase volume fraction or the silica particle concentration the rheological behavior of emulsions became again shear-thinning. This work will help to produce bioactive Pickering emulsions with tailor-made characteristics.
Subject(s): rheology
pickering emulsions
colloidal silica nanoparticles
Issue Date: 14-Oct-2019
Date Available: 3-Apr-2020
Language Code: en
DDC Class: 660 Chemische Verfahrenstechnik
Sponsor/Funder: BMBF, 031A163A, Basistechnologien Forschertandem: Modularisierte mehrphasige Biokatalyse durch enzymatisch aktive w/o Pickering Emulsionen im Membranreaktor (BioPICK)
Journal Title: Colloids and Surfaces B: Biointerfaces
Publisher: Elsevier
Volume: 185
Article Number: 110580
Publisher DOI: 10.1016/j.colsurfb.2019.110580
EISSN: 1873-4367
ISSN: 0927-7765
TU Affiliation(s): Fak. 3 Prozesswissenschaften » Inst. Lebensmitteltechnologie und Lebensmittelchemie » FG Lebensmitteltechnologie und -materialwissenschaften
Fak. 3 Prozesswissenschaften » Inst. Prozess- und Verfahrenstechnik » FG Verfahrenstechnik
Appears in Collections:Technische Universität Berlin » Publications

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