Preparation and characterization of semi-refined carrageenan from Kappaphycus alvarezii seaweed bleached by Peracetic Acid

Uju, E. Prasetyaningsih, J. Santoso, Noriho Kamiya, T. Oshima

Research output: Contribution to journalConference article

Abstract

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).

Original languageEnglish
Article number012077
JournalIOP Conference Series: Earth and Environmental Science
Volume278
Issue number1
DOIs
Publication statusPublished - May 23 2019
Event3rd EMBRIO International Workshop on Marine Biodiversity: Understanding, Utilization, Conservation, EIW 2018 - Bogor, Indonesia
Duration: Oct 9 2018Oct 10 2018

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carrageenan
seaweed
bleaching
acid
ash
viscosity
gel
sodium
sulfate
pigment

All Science Journal Classification (ASJC) codes

  • Environmental Science(all)
  • Earth and Planetary Sciences(all)

Cite this

Preparation and characterization of semi-refined carrageenan from Kappaphycus alvarezii seaweed bleached by Peracetic Acid. / Uju; Prasetyaningsih, E.; Santoso, J.; Kamiya, Noriho; Oshima, T.

In: IOP Conference Series: Earth and Environmental Science, Vol. 278, No. 1, 012077, 23.05.2019.

Research output: Contribution to journalConference article

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abstract = "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).",
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