Title: Extraction of red seaweed (Eucheuma spinosum) as raw material of hydrogel

Authors: Emi Erawati; Aisyah Nur'aini; Aulia Medista Navitri

Addresses: Department of Chemical Engineering, Faculty of Engineering, Universitas Muhammadiyah Surakarta, Jl. A. Yani Tromol Pos I, Pabelan, Kartasura, Surakarta, 57102, Indonesia ' Department of Chemical Engineering, Faculty of Engineering, Universitas Muhammadiyah Surakarta, Jl. A. Yani Tromol Pos I, Pabelan, Kartasura, Surakarta, 57102, Indonesia ' Department of Chemical Engineering, Faculty of Engineering, Universitas Muhammadiyah Surakarta, Jl. A. Yani Tromol Pos I, Pabelan, Kartasura, Surakarta, 57102, Indonesia

Abstract: Eucheuma spinosum seaweed was used as the raw material to produce carrageenan. The solvent used in this study was NaOH concentrations (0.5 N, 1 N, and 1.5 N) and extraction temperatures (85°C, 90°C, and 95°C) were examined. Red seaweed was soaked in aquadest while 0.5 N NaOH solution was heated until it reached 85°C. It was continued by straining the seaweed that was previously soaked in NaOH solution. The extraction was carried out for one hour. The solution was strained and the filtrate was cooled down until 30°C. The precipitation was done using 1 N solution of KCl, and then the precipitate was strained and dried in an oven. The results suggest that the best carrageenan were the one produced from the extraction using 1.5 N NaOH solutions at 95°C with the yield, moisture content, ash content, and sulphate content of 43.67%, 5.97%, 2.41%, and 9.02%, respectively.

Keywords: analysis of variance; carrageenan; concentration glutaraldehyde; extraction; Eucheuma spinosum; hydrogel; red seaweed; swilling degree; soaking time; yield.

DOI: 10.1504/PIE.2022.125606

Progress in Industrial Ecology, An International Journal, 2022 Vol.15 No.2/3/4, pp.206 - 219

Accepted: 27 Jan 2022
Published online: 16 Sep 2022 *

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