モノグリセリドとソルビタンエステルを含む乳脂肪-水エマルションの安定性 (第2報) : 電気泳動速度データによる油滴界面膜の構造推定

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The structures of oil globule membranes of 30% milk fat water emulsions containing monoglyceride (MG), sorbitan fatty acid ester (SE) and caseinate (CA) were studied by measuring electrophoretic mobilities (EM) of their dispersed oil globules at different pH. EMs were influenced by the hydrocarbon chain length of sorbitan ester (HCL). EM vs HCL pattern of the oil globules coated with SE was quite different from that of the oil globules coated with MG+SE. This fact means that the outer layer of oil globule membranes consited of neither MG nor SE exclusively. Thus, a mosaic model of MG-SE at the oil globule membrane, where MG and SE is supposed to form certain molecular association, can be assumed. EM vs HCL pattern of the oil globules coated with SE and MG+SE, had a resemblance to EM vs HCL pattern of those coated with SE+CA and MG+SE+CA respectively, This behavior seems that SE and MG+SE layers at the oil-water interface could be covered coasely by CA layer. The relation between EM and the rate of globule coalescence for the emulsions containing MG+SE+CA showed good linearity, However, EM appers to have little correlation with stability against coalescence, unless those oil globule membranes have a similar strength.
社団法人日本油化学会の論文