Characterization of core-shell calcium-alginate macrocapsules fabricated by electro-coextrusion.
Spherical macrocapsules, where calcium-alginate shell enclosed olive oil as a model core medium, were fabricated by electro-coextrusion. The effects of three key process factors, including alginate concentration in shell fluid (0.5-4.0%), shell-to-core flow rate ratio (4-12 at a fixed core flow rate of 0.05 mL/min), and applied voltage (0-10 kV), on the morphological and textural characteristics of the macrocapsules were analyzed using response surface methodology. The analysis showed that the diameter, shell thickness, hardness, and breaking energy of the macrocapsules were in the ranges of 0.89-1.61 mm, 17.4-66.4 μm, 1.37-11.01 N, and 0.34-6.90 mJ, respectively, and strongly influenced by all the three factors, except that the surface appearance was only significantly affected by the shell-to-core flow rate ratio. The process factors were also optimized for the practically useful macrocapsules, having non-oily surface and hardness larger than 3 N, using a graphical optimization technique.
Department of Marine Food Science and Technology, Gangneung-Wonju National University, Gangneung 210-702, Republic of Korea.
Natthiya
N
Phawaphuthanon
Department of Marine Food Science and Technology, Gangneung-Wonju National University, Gangneung 210-702, Republic of Korea.
Shabnam
S
Behnam
Functional Food Center, Korea Institute of Science and Technology (KIST), Gangneung 210-340, Republic of Korea.
Song Yi
SY
Koo
Functional Food Center, Korea Institute of Science and Technology (KIST), Gangneung 210-340, Republic of Korea.
Cheol-Ho
CH
Pan
Department of Marine Food Science and Technology, Gangneung-Wonju National University, Gangneung 210-702, Republic of Korea. Electronic address: dchung68@gwnu.ac.kr.
Donghwa
D
Chung
D000464:Alginates / Q000737:chemistry*; D002118:Calcium / Q000737:chemistry*; D002214:Capsules; D004560:Electricity; D019649:Food Industry; D020723:Glucuronic Acid / Q000737:chemistry; D006603:Hexuronic Acids / Q000737:chemistry; D000069463:Olive Oil; D010938:Plant Oils / Q000737:chemistry; D013499:Surface Properties
D000464:Alginates; D002214:Capsules; D006603:Hexuronic Acids; D000069463:Olive Oil; D010938:Plant Oils; D020723:Glucuronic Acid; D002118:Calcium
Calcium-alginate macrocapsules; Core–shell; Electro-coextrusion