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Coalescence Index of Protein‐Stabilized Emulsions
Author(s) -
BRITTEN MICHEL,
GIROUX HÉLÈNE J.
Publication year - 1991
Publication title -
journal of food science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.772
H-Index - 150
eISSN - 1750-3841
pISSN - 0022-1147
DOI - 10.1111/j.1365-2621.1991.tb05383.x
Subject(s) - coalescence (physics) , emulsion , whey protein isolate , homogenization (climate) , chemistry , chromatography , casein , chemical engineering , whey protein , materials science , food science , biochemistry , biology , biodiversity , ecology , astrobiology , engineering
A simple method is proposed to estimate coalescence stability of protein‐stabilized emulsions. Coalescence was accelerated through agitation and measured by change in emulsion turbidity over time. A coalescence index (CI) was determined and used to compare emulsions stabilized with casein, whey (WPI) and soy protein isolates (SPI). CI increased when stirring rate increased. Casein produced more stable emulsions, followed by WPI and SPI. High homogenization pressure increased coalescence stability of WPI and SPI‐stabilized emulsions and decreased coalescence stability of casein‐stabilized emulsions. Microscopic examination, showed agitation of the emulsion had clearly induced formation of large oil droplets which acted as coalescence nuclei.