Microencapsulation of Ascorbic Acid by Spray Drying: Influence of Process Conditions
Ascorbic acid (AA), commonly known as vitamin C, is essential for normal functioning of the body and maintenance of metabolic integrity. Among its various roles are as an antioxidant, a cofactor in collagen formation and other reactions, as well as reducing physical stress and maintenance of the immune system. Recent collaborative research between the Australian Defence Science and Technology Organisation (DSTO) in Scottsdale, Tasmania and RMIT University has sought to overcome the problems arising from the inherent instability of ascorbic acid during processing and storage of foods. The recent work has demonstrated the potential of microencapsulation by spray drying as a means to enhance retention. The purpose of this current study has been focused upon the influence of spray drying conditions on the properties of encapsulated ascorbic acid. The process was carried out according to a central composite design. Independent variables were: inlet temperature (80-120° C) and feed flow rate (7-14 mL/minute). Process yield, ascorbic acid loss, moisture content, water activity and particle size distribution were analysed as responses. The results have demonstrated the potential of microencapsulation by spray drying as a means to enhance retention. Vitamin retention, moisture content, water activity and process yield were influenced positively by inlet air temperature and negatively by feed flow rate.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1085985Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 3968
 Bui, L. T. T., & Small, D. M. (2008). The impact of flours and product storage on the thiamin content of Asian noodles. LWT - Food Science and Technology, 41(2), 262-269.
 Bui, L. T. T., & Small, D. M. (2009). Riboflavin in Asian noodles: the impact of processing, storage and the efficiency of fortification ot three product styles. Food Chemistry. 114(4), 1477--1483.
 Bui, L. T. T., & Small, D. M. (2012). The stability of pyridoxine hydrochloride used as a fortification in Asian wheat flour noodles. Food Chemistry. 130, 841-846.
 Hau Fung Cheung, R., Hughes, J. G., Marriot, P. J. & Small, D. M. (2009). Investigation of folic acid stability in fortified Asian noodles by use of capillary electrophoresis. Food Chemistry, 112(2): 507-514.
 Wijaya, M., Small, D. M., and Bui, L. T. T. (2011). Microencapsulation of ascorbic acid for enhances long-term retention during storage. Technical report number DSTO-TR-2504. DSTO: Fisherman Bend, Victoria, Australia.
 Re, M. J. (1998). Microencapsulation by spray drying. Drying Technology, 16(6), 1195-1236.
 Desai, K. G. H., & Park, H. J. (20059. Recent developments in microencapsulation of food ingredients. Drying Technology, 23, 1361-1394.
 Liu, Z., Zhou, J., Zeng, Y., & Ouyang, X. (2004). The enhancement and encapsulation of Agaricus bisporus flavor. Journal of Food Engineering. 65, 391-396.
 Thompson, C. O., Trenerry, V. C., & Kemmery, B. (1995). Micellar electrkinetic capillary chromatographic determination of artificial sweeteners in low-joule soft drinks and other foods. Journal of Chromatography A, 694, 507-514.
 Cornell, H. J., Hoveling, A. W., Chryss, A. & Rogers, M. (1994). Particle size distribution in wheat starch and its importance in processing, Starch, 46, 203-207.
 Kwak, B. M., Lee, J. E., Ahn, J. H., & Jeon, T. H. (2009). Laser diffraction particle sizing by wet dispersion method fro spray-dried infant formula, Journal of Food Engineering, 92, 324-330.
 Bernetti, R. (2002). Sugars and sugar products. In W. Horwitz (Ed.) Official methods of analysis pf AOAC International - Food composition; additives; natural contaminants (vol. 2, pp. 1-45). Maryland, United States.
 Cai, Y. Z., Corke, H., 2000. Produciton and properties of spray-dried Amaranthus betacyanin pigments. Journal of Food Science 65 (6), 1248-1252.