tailieunhanh - Microencapsulation of Gac oil in chitosan bead

In this paper, Gac oil was encapsulated in chitosan beads using dripping method. Gac oil emulsified in chitosan 2 % was dropped into alkaline solution. The bead’s formation was evaluated through the decrease of bead weight and pH of alkaline solution. Chitosan beads expressed a good protection to Gac oil with a calculated haft-time life of beta-carotene up to 2 years. Encapsulation yield and encapsulation efficiency were also determined. | Journal of Science and Technology 54 (2C) (2016) 451-457 MICROENCAPSULATION OF GAC OIL IN CHITOSAN BEAD Ta Thi Minh Ngoc1, *, Tran Hai Dang2, Tran Van Thanh3 1 Faculty of Food technology, Nha Trang University, 2 Nguyen Dinh Chieu, Nha Trang, Khanh Hoa 2 Insitute of Biotechnology and Environment, Nha Trang University, 2 Nguyen Dinh Chieu, Nha Trang, Khanh Hoa 3 Pharmaceutical Faculty, Medical and Pharmaceutical University of Ho Chi Minh city, 217 Hong Bang, 11th ward, District 5, Hochiminh city * Email: ngocttm.@ Received: 15 June 2016; Accepted for publication: 28 October 2016 ABSTRACT Gac oil is a Vietnamese traditional product that contains a high concentration of interesting carotenoids (beta-carotene and lycopene), which are very useful in cancer treatment and antiaged protection due to their strong antioxidant activity. However, its hydrophobicity restrains its uses in food applications which are normally aqueous systems. This problem is possibly overcome with the help of microencapsulation technology. In this paper, Gac oil was encapsulated in chitosan beads using dripping method. Gac oil emulsified in chitosan 2 % was dropped into alkaline solution. The bead’s formation was evaluated through the decrease of bead weight and pH of alkaline solution. Chitosan beads expressed a good protection to Gac oil with a calculated haft-time life of beta-carotene up to 2 years. Encapsulation yield and encapsulation efficiency were also determined. Keywords: Gac oil, beta-carotene, encapsulation, chitosan bead, dripping method. 1. INTRODUCTION Microencapsulation is a well-known technique, which not only provides protection against environment stress to bioactive ingredients, but also be capable in transforming them into a new form for wider application. In fact, liquid (hydrophile or hydrophobe) can be transformed in to free-flow powder with designed particle size with a reasonable method. Dripping is a classical method which bases on formation of droplets .