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Abstract
A study has been made of the influence of mono-and dl-glycerides on the reduction of interfacial tension between corn oil and water by acid modified 7S soy protein fraction (7MSPF). The precise effect depended on the ratio of the three surfactants employed. In all cases the reduction of interfacial tension proceeded over approximately 60 min and the greatest effect was exerted when using a 1/1 weight ratio of 7MSPF/glycerides, with the mono- and di-glycerides also in a 1/1 weight ratio. Under these conditions adsorbed molecules of mono- and di-glycerides associate at the interface thus occupying a smaller area than if they had not done so. This facilitates the reconformation of 7MSPF molecules at the interface, following a much slower rate of adsorption, and their association with the mono- and di-glyceride molecular complex formed previously.