A novel ohmic-based technology for seaweed processing
2018
Laga, A. | Mahendradatta, M. | Supratomo | Waris, A. | Hasizah, A. | Salengke, S. | Metusalach, M.
Carrageenans are important hydrocolloids extracted from red seaweeds (Rhodophyceae) of genus Eucheuma, Iridiae, Gigartina, and Chondrus. Carrageenan extraction technologies currently applied in modern industries are based on conventional heating using double-jacketed tanks supplied with steam as heating medium. This technology is inefficient in energy use and posesa complicated processing setup since it requires a dedicated steam generator and steam delivery system. The objective of this study was to develop an ohmic-based novel technology for seaweed processing. The system developed and used in this study consisted of three ohmic heating chambers (7.5 liter each) working in parallel in static mode. The system was tested for iota carrageenan extraction from Eucheuma denticulatum (known commercially as Eucheuma spinosum) using 0.3M KOH solution as extracting medium with seaweed to solution ratio of 1:35 (w/v).The tests were conducted at several temperatures and extraction durations to gain broad insights on the effectiveness of this novel technology. The test results indicated that this technology can efficiently extract carrageenan from E. spinosum with yields in the range of 41-61% (dry weight basis) and viscosity and gel strength in the range of 269-274 cP and 50.87-55.27 g/cm² respectively. These results suggest that ohmic-based seaweed processing technology is a viable alternative to conventional technologies currently applied in industries.
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