Interfacial and foaming properties of sulfydryl-modified bovine beta-lactoglobulin.
The effects of a control blocking of free cystein by N-ethylmaleimide on the interfacial behavior (kinetics of adsorption at the air/water interface, rheology of the interfacial layer) as well as on the foaming properties (density, stability) of beta-lactoglobulin were investigated. Compared to native beta-lactoglobulin (unmodified beta-lactoglobulin), sulfydryl-modified beta-lactoglobulin exhibited higher surface hydrophobicity, adsorbed faster at the air/water interface, had the capability to develop rapidly an interfacial layer with high shear elastic constant but exhibited a considerably lower shear elastic constant plateau value. Moreover, sulfydryl-modified beta-lactoglobulin exhibited better foaming properties especially regarding the short-term foam stability suggesting that the initial rheology of the interfacial film is at least as much important for the general mechanism of foam stabilization as the potential viscoelasticity the interfacial film could reach on aging.
Croguennec
Thomas
T
UMR 1253 Science et Technologie du Lait et de l'Oeuf, INRA-Agrocampus Rennes, CS-84215, 65, rue de St. Brieuc, 35042 Rennes Cedex, France. thomas.croguennec@agrocampus-rennes.fr
Renault
Anne
A
Bouhallab
Saïd
S
Pezennec
Stéphane
S
D000327:Adsorption; D000388:Air; D000818:Animals; D002417:Cattle; D057927:Hydrophobic and Hydrophilic Interactions; D007700:Kinetics; D007782:Lactoglobulins / Q000737:chemistry*; D012212:Rheology; D013438:Sulfhydryl Compounds / Q000737:chemistry*; D013499:Surface Properties; D013997:Time Factors; D014867:Water / Q000737:chemistry
D007782:Lactoglobulins; D013438:Sulfhydryl Compounds; D014867:Water