10.1021/jf5008715.s001
Outi Toikkanen
Outi
Toikkanen
Maija Lähteenmäki
Maija
Lähteenmäki
Timo Moisio
Timo
Moisio
Pirkko Forssell
Pirkko
Forssell
Riitta Partanen
Riitta
Partanen
Lasse Murtomäki
Lasse
Murtomäki
Study of
Oxygen Transfer across Milk Proteins at an
Air–Water Interface with Scanning Electrochemical Microscopy
American Chemical Society
2014
Scanning Electrochemical MicroscopyScanning electrochemical microscopy
oxygen transfer
oxygen permeability
diffusion coefficient
diffusion coefficients
oxygen transport
SECM
Oxygen Transfer
2 orders
PD
Milk Proteins
interface
milk proteins
protein films
oxygen barrier properties
milk protein films
Langmuir trough
2014-03-12 00:00:00
Journal contribution
https://acs.figshare.com/articles/journal_contribution/Study_of_Oxygen_Transfer_across_Milk_Proteins_at_an_Air_Water_Interface_with_Scanning_Electrochemical_Microscopy/2315539
Scanning electrochemical microscopy
(SECM) combined with a Langmuir
trough was used for studying oxygen transfer across protein films
at an air–water interface. The method allows the comparison
of the oxygen permeability of different emulsifiers without any concerns
of interference of atmospheric oxygen. Two milk proteins, β-lactoglobulin
and β-casein, were compared, and the permeabilities obtained
were for β-casein <i>PD</i> ≈ 2.2 × 10<sup>–7</sup> cm<sup>2</sup>/s and for β-lactoglobulin <i>PD</i> ≈ 0.6 × 10<sup>–7</sup> cm<sup>2</sup>/s, which correspond to the lowest limit of the diffusion coefficients
and are 2 orders of magnitude lower than the diffusion coefficient
of oxygen in water, yet several orders of magnitude higher than previously
reported for milk protein films. The method allows characterization
of the oxygen barrier properties of liquid interfacial films, which
is of crucial importance for understanding the role of the interface
in the inhibition of oxygen transport and developing modified interfaces
with higher oxygen blocking efficacy.