1. Surface behavior and bulk properties of aqueous chitosan and type-B gelatin solutions for effective emulsion formulation
- Author
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Jinping Guan, Fabien Salaün, Jagadish Chandra Roy, Stéphane Giraud, and Ada Ferri
- Subjects
food.ingredient ,Polymers and Plastics ,02 engineering and technology ,engineering.material ,010402 general chemistry ,01 natural sciences ,Gelatin ,Turbidity ,Chitosan ,chemistry.chemical_compound ,Coacervate ,food ,Polymer chemistry ,Materials Chemistry ,Zeta potential ,Type-B gelatin ,Aqueous solution ,Organic Chemistry ,Metals and Alloys ,021001 nanoscience & nanotechnology ,O/W emulsion ,2506 ,0104 chemical sciences ,Creaming ,chemistry ,Emulsion ,engineering ,Biopolymer ,0210 nano-technology ,Nuclear chemistry - Abstract
The behavior of aqueous chitosan (CH), type-B gelatin (GB) and CH-GB coacervate was studied on oil-in-water emulsion formulation at various pH and concentration ratio. The coacervate was formed by phase separation at ratios CH:GB, 1:10 to 1:1 with total biopolymer concentrations of 0.55%-1.0% (w/v) at pH 4.0-5.5. Soluble complexes were formed below pH 5.0 and coacervate formation was confirmed at pH 5.0 and above by zeta potential and UV-spectroscopy measurements. The coacervate formation was found maximum at the CH-GB ratios of 1:10 and 1:5 at pH 5.5. Formulated emulsions (>10μm droplets) using 1% (w/v) chitosan and GB were found stable (+52.5mv and creaming index 86%) and unstable respectively. Emulsion stabilized by mixed CH:GB 1:5 (3%w/v) had no creaming effect. The instability was attributed to the lower surface activity (K=5.0Lg-1) of pure GB compared to CH (K=14.3Lg-1). The formulation and methods can successfully tune the stability of the emulsions.
- Published
- 2017
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