Protein–polysaccharide interaction: κ-carrageenan and iota-carrageenan both carry sulfate groups that interact electrostatically with the positively charged κ-casein regions on the micelle surface. This interaction effectively anchors carrageenan to the protein network, producing a reinforced gel structure that prevents wheying-off (syneresis).
LBG synergy: LBG (galactomannan) does not gel alone, but its unbranched mannose backbone intercalates with iota-carrageenan helices via hydrogen bonding. This co-network raises gel modulus by 30–50% and reduces brittleness.
✦ Dairy dessert formula: Iota-carrageenan 0.25% + LBG 0.15% + skim milk base pH 6.6–6.8, dissolved at 80°C, set at <15°C
Critical variable: Fat content modulates texture — in full-fat milk, fat globules act as active fillers. In reduced-fat systems, increase iota-carrageenan by 0.05% to compensate for lost body.
