Rendemen, gel strength and viscosity of red algae Kappaphycus alvarizii (Doty) in Minahasa Peninsula
Paper Details
Rendemen, gel strength and viscosity of red algae Kappaphycus alvarizii (Doty) in Minahasa Peninsula
Abstract
Seaweed Kappaphycus alvarezii is member of red algae (Rhodophyta) largely cultivated that is a carrageenan source highly needed in various industries worldwide. This study was aimed at knowing the rendemen, the gel strength and the gel viscosity of the carrageen production from K. alvarezii farming sites in Minahasa penninsula. Samples were collected from 4 regencies and extracted for carrageenan analysis and its physical properties. Results showed that the highest rendemen, 55.31%, was found in the product of Sondaken, South Minahasa, followed by Buku Tengah, Southeast Minahasa, 47.04%, Tumpaan, Minahasa, 39.62%, and the lowest in Jayakarsa, North Minahasa, 30.94%. The highest gel strength was recorded in the product of Buku Tengah, 1,391 g, followed by Tumpaan, 1,113 g, Jayakarsa, 626 g, and the lowest in Sondaken, 557 g. The highest viscocity was found in the product of Buku Tengah, 60 cps, then Sondaken 50 cps, Likupang, 40 cps, and Tumpaan, 30 cps, respectively. The highest rendemen occurred in the water with temperature range of 28.4 – 29.9oC and pH of 8.14 – 8.15. The highest gel strength was found in thw water with nitrate concentration range of 0.1-0.2 gr/cm2 , the highest viscosity in salinity range of 29.1 – 29.7 ppm. Carrageenan quality was highly dependent upon the interactions among water quality parameters and the supporting seaweed K. alvarezii farming site for optimal nutrient absorption around its habitat.
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