Microencapsulation of oil by polymer mixture–ionic surfactant interaction induced coacervation

• Published in: Carbohydrate polymers Vol. 79; no. 3; pp. 563 - 570
• Main Authors: Katona, Jaroslav M., Sovilj, Verica J., Petrović, Lidija B.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 11-02-2010; Elsevier
• Subjects: Applied sciences; Biological and medical sciences; Cellulose and derivatives; Coacervation; Exact sciences and technology; Fat industries; Food industries; Fundamental and applied biological sciences. Psychology; Microencapsulation; Natural polymers; Physicochemistry of polymers; Polymer–polymer interaction; Polymer–surfactant interaction; Segregative phase separation; Spray drying; Thermodynamic incompatibility; Coacervation; Polymer–surfactant interaction; Spray drying; Microencapsulation; Segregative phase separation; Polymer–polymer interaction; Thermodynamic incompatibility; Viscoelasticity; Coacervate; Cellulose(carboxymethyl); Oil water emulsion; Microcapsule; Polymer-polymer interaction; Experimental study; Quaternary system; Lauryl sulfate; Intermolecular interaction; Polyelectrolyte; Anionic surfactant; Sunflower oil; Morphology; Phase separation; Cellulose(hydroxypropyl); Aqueous solution; Polymer-surfactant interaction; Cellulose ether
• ISSN: 0144-8617; 1879-1344
• DOI: 10.1016/j.carbpol.2009.09.007

In a ternary mixture composed of 0.7% hydroxypropylmethyl cellulose (HPMC), 0.3% sodium carboxymethyl cellulose (NaCMC), and 0.00–2.00% sodium dodecylsulfate (SDS) various interactions between components take place. The interactions depend on SDS concentration and may result in HPMC–SDS complex formation which is thermodynamically incompatible with NaCMC. Such a ternary mixture phase separates into a coacervate rich in HPMC–SDS complex and equilibrium solution rich in NaCMC. In this paper, it was shown that viscoelastic properties of the coacervate are influenced by HPMC/NaCMC/SDS interaction. Emulsions of sunflower oil in ternary HPMC/NaCMC/SDS mixtures were prepared, and deposition of coacervate (of different viscoelastic properties) at the O/W interface was investigated in order to prepare oil-containing microcapsules with a coacervate shell of different properties. Deposition and stability of the coacervate shell depend on SDS concentration in emulsion. Powder of microcapsules was obtained by spray drying, and barrier properties of microcapsules’ shell were investigated by oil extraction. Amount of extracted oil correlates with viscoelastic properties of corresponding coacervate.