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All Journal Jurnal Pengolahan Hasil Perikanan Indonesia Squalen Bulletin of Marine and Fisheries Postharvest and Biotechnology
Fransiska, Dina
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Environmental Science Immunology & microbiology

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Effect of Alginate and Polyethylene Glycol Addition on Physical and Mechanical Characteristics of k-Carrageenan-based Edible Film Giyatmi, Giyatmi; Poetri, Tika Annisa Eka; Irianto, Hari Eko; Fransiska, Dina; Agusman, Agusman
Squalen, Buletin Pascapanen dan Bioteknologi Kelautan dan Perikanan Vol 15, No 1 (2020): May 2020
Publisher : Research and Development Center for Marine and Fisheries Product Processing and Biotechnol

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (516.391 KB) | DOI: 10.15578/squalen.v15i1.418

Abstract

Waste disposal problems have attracted scientists around the world to explore the use of renewable resources to produce biodegradable films and coatings. Indonesia has diverse renewable resources of biopolymers that originated from seaweeds such as carrageenan, agar, and alginate. Carrageenan is considered as a potential biopolymer for edible film manufacture due to its characteristic range. This study aimed to develop carrageenan-based edible film using alginate and polyethylene glycol as plasticizers. Edible film made from k-carrageenan with the addition of alginate and polyethylene glycol (PEG) as plasticizers was tested for its mechanical properties, water vapor transmission rate (WVTR) and water solubility.  Blending k-carrageenan with alginate (0%, 0.25%, 0.5%, 0.75%, and 1.0% w/v) increased tensile strength, thickness, and water solubility, but reduced elongation at break, WVTR, and moisture content. The addition of PEG (1%, 2%, and 3% w/v) reduced tensile strength and water solubility, but increased elongation at break, thickness, and moisture content. This study recommended that the best carrageenan-based edible film was obtained from a formula using 1% alginate (w/v) and 1% PEG (w/v).
Effect of sulfuric acid treatment in cellulose nanocrystals extraction from Sargassum sp. seaweed: Efek perlakuan asam sulfat pada ekstraksi selulosa nanokristal dari rumput laut Sargassum sp. Fransiska, Dina; Hastiana, Sabina; Sidartha, B. Boy Rahardjo; Pangesty, Azizah Intan; Chalid, Mochamad; Priadi, Dedi; Ausias, Gilles; Hari Eko Irianto
Jurnal Pengolahan Hasil Perikanan Indonesia Vol. 28 No. 9 (2025): Jurnal Pengolahan Hasil Perikanan Indonesia 28(9)
Publisher : Department of Aquatic Product Technology IPB University in collaboration with Masyarakat Pengolahan Hasil Perikanan Indonesia (MPHPI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17844/y5x3as39

Abstract

Sargassum sp. is a type of brown seaweed often found in tropical waters, but it has not been optimally used. The high cellulose content of Sargassum sp. can be used to produce cellulose nanocrystals (CNC). CNC can act as a bionanocomposite-reinforced nanomaterial. This study aimed to determine the most effective sulfuric acid concentration for extracting cellulose nanocrystals from Sargassum sp. CNC was extracted from Sargassum sp. using acid hydrolysis and sonication. The sulfuric acid concentration was varied to 30, 40, 50, and 60%. CNC was characterized using Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and thermogravimetric analysis (TGA). FTIR analysis confirmed the presence of characteristic CNC functional group peaks, including C–O–C (~1160 cm⁻¹), C–O (~1050–1030 cm⁻¹), and β-(1→4)-glycosidic C–H (~897 cm⁻¹) as the CNC fingerprint. The FTIR findings indicated that the CNC extracted by sulfuric acid hydrolysis differed significantly from the raw Sargassum sp. material. Additionally, the XRD results showed that acid hydrolysis substantially affected the amorphous regions of cellulose. With 40% acid hydrolysis, the XRD analysis showed the highest CNC degree of 77.6%. Thermal analysis using TGA and DTG revealed that cellulose nanocrystals treated with 40% acid hydrolysis yielded CNC with enhanced thermal stability, exhibiting a maximum thermal decomposition temperature of 369.60°C. CNC isolated from Sargassum sp. cellulose has the potential to serve as a suitable source for manufacturing nanocomposites in various applications, such as pharmaceuticals, food packaging, and biomedical fields.
Co-Authors Agusman, Agusman Ausias, Gilles Azizah Intan Pangesty Dedi Supriadi Hari Eko Irianto Hastiana, Sabina Laksono Trisnantoro Mochamad Chalid Poetri, Tika Annisa Eka Sidartha, B. Boy Rahardjo