Interfacial protein adsorption behavior can be connected across a wide range of timescales using the microfluidic EDGE (Edge-based droplet GEneration) tensiometer.
J Colloid Interface Sci
; 674: 951-958, 2024 Nov 15.
Article
in En
| MEDLINE
| ID: mdl-38959740
ABSTRACT
HYPOTHESIS:
Our hypothesis is that dynamic interfacial tension values as measured by the partitioned-Edge-based Droplet GEneration (EDGE) tensiometry can be connected to those obtained with classical techniques, such as the automated drop tensiometer (ADT), expanding the range of timescales towards very short ones. EXPERIMENTS Oil-water and air-water interfaces are studied, with whey protein isolate solutions (WPI, 2.5 - 10 wt%) as the continuous phase. The dispersed phase consists of pure hexadecane or air. The EDGE tensiometer and ADT are used to measure the interfacial (surface) tension at various timescales. A comparative assessment is carried out to identify differences between protein concentrations as well as between oil-water and air-water interfaces.FINDINGS:
The EDGE tensiometer can measure at timescales down to a few milliseconds and up to around 10 s, while the ADT provides dynamic interfacial tension values after at least one second from droplet injection and typically is used to also cover hours. The interfacial tension values measured with both techniques exhibit overlap, implying that the techniques provide consistent and complementary information. Unlike the ADT, the EDGE tensiometer distinguishes differences in protein adsorption dynamics at protein concentrations as high as 10 wt% (which is the highest concentration tested) at both oil-water and air-water interfaces.Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Surface Tension
/
Water
/
Whey Proteins
Language:
En
Journal:
J Colloid Interface Sci
/
J. colloid interface sci
/
Journal of colloid and interface science
Year:
2024
Document type:
Article
Country of publication:
Estados Unidos