Journal of Nutrition & Food Sciences
Open Access
ISSN: 2155-9600
ISSN: 2155-9600
S Salengke, Supratomo A Waris and Mochtar A H
Hasanuddin University, Indonesia
Posters & Accepted Abstracts: J Nutr Food Sci
Justification: Carrageenans are important hydrocolloids extracted from red seaweeds (Rhodophyceae) of genus Eucheuma, Iridiae, Gigartina, and Chondrus. Carrageenan extraction technologies currently applied in industries are based on conventional heating using double-jacketed tanks supplied with steam as heating medium or using diesel-oil burners for heating the cooking tanks from underneath. These technologies are inefficient in energy use and in the case of heating in double jacketed tanks; a complicated processing setup is encountered because of the need for dedicated steam generator and a steam delivery system. Objective: The objectives of this study were to develop an ohmic-based novel technology for seaweed processing and to perform experiments to obtain an optimal processing condition for carrageenan extraction. Methods: The system developed consisted of three ohmic heating chambers (7.5 liter each) working in parallel, a 100-liter tank and a pump. The extracting medium can be circulated within the system, from the tank to the ohmic chambers and back to the tank using the pump. The optimization of process parameters was conducted using response surface methodology (RSM). A four factor central composite design (CCD) was used to develop a statistical model to optimize extraction yield. The experimental parameters were extraction temperature and time, KOH concentration and seaweed to solution ratio. Results & Significance: The results of this study showed that carrageenan can be effectively extracted from seaweeds using ohmic technology with yields above 70 percent. Optimal processing conditions for extraction of iota carrageenan from Eucheuma spinosum and kappa carrageenan from Kappaphycus alvarezii have been identified.
Email: salengke@unhas.ac.id