Rheological Properties, Moisture Content, and Carrageenan Yield of Macroalga Kappaphycus alvarezii Using Freshwater and Marine Water as Pre-Treatment

Year 2024, Volume: 7 Issue: 1, 23 - 31, 30.06.2024

Adzmon Garamon , Nour Aley Yangson , Jurmin Sarri

Abstract

A variety of seaweed post-harvest techniques have been developed using the same method of washing the seaweed with marine and drying it under the sun; however, a method of washing the seaweed with freshwater has yet to be developed. This study investigates the effect of freshwater and marine water as soaking solutions on the moisture content, carrageenan yield, and rheological properties of macroalga K. alvarezii. The seaweed was immersed in freshwater and marine water for 10 minutes with triplicates before being dried in a solar dryer for seven days. Extraction of seaweed was done after drying. Results revealed that the dried K. alvarezii soaked in freshwater had significantly lower (p≤0.05) moisture content than K. alvarezii soaked in marine water. Additionally, the carrageenan yield of K. alvarezii significantly increased (p≤0.05) by 14.48% when soaked in freshwater compared to the yield in marine water. Considering the rheological properties of the seaweed, the gelling temperature and melting temperature of K. alvarezii soaked in freshwater did not differ significantly (p≥0.05) from those of K. alvarezii soaked in marine water. However, other rheological properties such as the syneresis, viscosity, and gel strength of K. alvarezii greatly improved (p≤0.05) when they were soaked in freshwater with significant increases of 2.21%, 1.84 cPs, and 13.22 g cm-2, respectively. Thus, this study indicates that macroalga K. alvarezii immersed in freshwater showed substantial improvements in their carrageenan quality.

Keywords

Carrageenan yield, Kappaphycus alvarezii, moisture content, seaweeds, rheological properties

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