Semi-refined carrageenan (SRC) is one of the products from Kappaphycus alvarezii, which has the potential to be developed in Indonesia. However, unbleached seaweed will produce SRC with light brown colour due to natural seaweed pigments. Peracetic acid (PAA) is a strong oxidizing agent that has the potential to be used as a bleaching agent in the SRC production. This research aimed to study the effects of the PAA as a bleaching agent on the characteristics of SRC from K. alvarezii. Chopped seaweed was heated in 10% KOH at 80°C for 30 minutes. Bleaching was carried out at room temperature for 90 minutes using PAA at a concentration of 0.5%, 1.5%, and 2.5% (w/w) or using 1.5% (w/w) of sodium hypochlorite. Bleaching using PAA produced SRC whiter than without bleaching and bleaching using sodium hypochlorite. SRC brightness increased with increasing concentrations of PAA and while the yield reduced, as well as the viscosity, gel strength, sulfate content and ash content. The best concentration of PAA was 0.5%. At best, PAA concentration bleaching produced white SRC flour with a lightness value of 80.46±0.01; yield of 23.50%; viscosity 99.33 cP, gel strength 307.63 g/cm2, sulfate 13.29% (w/w), ash 8.33% (w/w) and acid-insoluble ash 1.33% (w/w).
|Journal||IOP Conference Series: Earth and Environmental Science|
|Publication status||Published - May 23 2019|
|Event||3rd EMBRIO International Workshop on Marine Biodiversity: Understanding, Utilization, Conservation, EIW 2018 - Bogor, Indonesia|
Duration: Oct 9 2018 → Oct 10 2018
All Science Journal Classification (ASJC) codes
- Environmental Science(all)
- Earth and Planetary Sciences(all)