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Protein-tannic acid multilayer films: A multifunctional material for microencapsulation of food-derived bioactives

Lau, Hooi Hong, Murney, Regan, Yakovlev, Nikolai L., Novoselova, Marina V., Lim, Su Hui, Roy, Nicole, Singh, Harjinder, Sukhorukov, Gleb B., Haigh, Brendan, Kiryukhin, Maxim V.
Journal of colloid and interface science 2017 v.505 pp. 332-340
adhesion, beta-lactoglobulin, bioactive compounds, bovine serum albumin, digestion, functional foods, gastric juice, human cell lines, humans, immunoglobulin G, ingredients, microencapsulation, stomach
The benefits of various functional foods are often negated by stomach digestion and poor targeting to the lower gastrointestinal tract. Layer-by-Layer assembled protein-tannic acid (TA) films are suggested as a prospective material for microencapsulation of food-derived bioactive compounds. Bovine serum albumin (BSA)-TA and pepsin-TA films demonstrate linear growth of 2.8±0.1 and 4.2±0.1nm per bi-layer, correspondingly, as shown by ellipsometry. Both multilayer films are stable in simulated gastric fluid but degrade in simulated intestinal fluid. Their corresponding degradation constants are 0.026±0.006 and 0.347±0.005nm⁻¹min⁻¹. Milk proteins possessing enhanced adhesion to human intestinal surface, Immunoglobulin G (IgG) and β-Lactoglobulin (BLG), are explored to tailor targeting function to BSA-TA multilayer film. BLG does not adsorb onto the multilayer while IgG is successfully incorporated. Microcapsules prepared from the multilayer demonstrate 2.7 and 6.3 times higher adhesion to Caco-2 cells when IgG is introduced as an intermediate and the terminal layer, correspondingly. This developed material has a great potential for oral delivery of numerous active food-derived ingredients.