Carrageenan Extraction of Kappaphycus alvarezii Seaweed from Nusa Lembongan Waters Using Different Alkaline Treatments

Kappaphycus alvarezii is a carrageenan-producing red seaweed that widely cultivated in Nusa Lembongan waters, Bali, Indonesia. Carrageenan generally extracted using an alkaline base,. iIn this study three different types of alkali were used to extract carrageenan originating from Waters. This aims determine the quality extraction. The alkalis KOH, NaOH, Ca(OH)2, and distilled water as control. 20 g dried was weighed, washed with tap running water, immersed 0.15% solution (KOH, Ca(OH)2) well for 24 hrs. Followed by rinsing until pH neutral. soaked heated at 100ºC 2 hours ratio 1 kg L, filtered. mixed 1.25% KCI. precipitate put oven 60-80ºC dry 48 hours. yield test results showed use Ca(OH)2 resulted 29.28% better than KOH (28.18%) NaOH (27.7%). Based on analysis Fourier Transform Infrared Spectroscopy (FTIR), extraction functional groups characteristic iota-carrageenan, whereas kappa-carrageenan.