Peranan Kalium Hidroksida (KOH) Terhadap Mutu  Karaginan Eucheuma cottonii di Indonesia

The effects of alkali type and pH on the physical properties of carrageenan have been extensively studied. However, their effects on certain characteristics of solid-state properties of carrageenan have not been identified. This research aimed to investigate the effect of alkaline solvent type and pH on the solid physical properties of carrageenan isolated from Eucheuma cottonii. Carrageenan was extracted from the algae using NaOH, KOH, and Ca(OH)2 at pHs of 9, 11, and 13. Based on the results of preliminary characterization, including yield, ash content, pH, sulphate content, viscosity, and gel strength, it was found that all samples followed Food and Agriculture Organization (FAO) specifications. The swelling capacity of carrageenan based on the type of alkali was KOH > NaOH > Ca(OH)2. The FTIR spectra of all samples were in agreement with that of standard carrageenan. The molecular weight (MW) of carrageenan using KOH as the alkali followed the order pH 13 > pH 9 > pH 11, while using NaOH, the order was pH 9 > pH 13 > pH 11, and while using Ca(OH)2, the order was pH 13 > pH 9 > pH 11. The results of the solid-state physical characterization of carrageenan with the highest MW in each type of alkali showed that the morphology of carrageenan using Ca(OH)2 has a cubic shape and is more crystal-like. The order of crystallinity of carrageenan using different types of alkali was Ca(OH)2 (14.44%) > NaOH (9.80%) > KOH (7.91%), while the order of density was Ca(OH)2 > KOH > NaOH. The order of solid fraction (SF) of the carrageenan was KOH > Ca(OH)2 > NaOH, while the tensile strength when using KOH was 1.17, when using NaOH it was 0.08, and while using Ca(OH)2, it was 0.05. The bonding index (BI) of carrageenan using KOH = 0.04, NaOH = 0.02, and Ca(OH)2 = 0.02. The brittle fracture index (BFI) of the carrageenan was KOH = 0.67, NaOH = 0.26, and Ca(OH)2 = 0.04. The order of carrageenan solubility in water was NaOH > KOH > Ca(OH)2. These data can be used as the basis for the development of carrageenan for excipients in solid dosage forms.

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“…• Molecular weight Molecular weight measurements, were conducted by using the intrinsic viscosity measurement method [58].…”

Section: • Swelling Capacitymentioning

confidence: 99%

Effects of Alkaline Solvent Type and pH on Solid Physical Properties of Carrageenan from Eucheuma cottonii

Ferdiansyah

Abdassah

Zainuddin

et al. 2023

Gels

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“…Cara alkali memiliki nilai tertinggi, diduga penggunaan larutan alkali selama proses ekstraksi. Hal ini sesuai (Meiyasa & Tarigan, 2018) larutan KOH mampu mempercepat terbentuknya 3,6 anhidrogalaktosa sehingga nilainya meningkat. Ditambahkan (Fardhyanti & Jualianur, 2015;Gerung et al, 2019), larutan basa mampu memecah dinding sel sehingga meningkatkan daya larut karaginan.…”

Section: Hasil Dan Pembahasanunclassified

Analisis Parameter Fisika dan Kimia Karaginan Kappaphycus alvarezii Doty 1985 (Florideophyceae : Solieriaceae) Dengan Variasi Ekstraksi dari Perairan Bluto

2019

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Kappaphycus alvarezii merupakan rumput laut merah penghasil karaginan yang dimanfaatkan dalam berbagai industri dan diperoleh melalui ekstraksi. Ekstraksi umumnya menggunakan larutan alkali sebagai pelarut dalam proses pemanasan maupun perendaman. Ekstraksi tanpa larutan alkali masih jarang dilakukan. Ekstraksi cara alkali, non-alkali maupun pre-treatment alkali mempengaruhi kualitas karaginan sehingga penelitian ini perlu dilakukan. Tujuan penelitian untuk memperoleh karaginan kualitas terbaik dari 3 metode ekstraksi. Parameter yang diambil meliputi rendemen, kadar air, kadar abu, kekuatan gel, viskositas dan analisis FTIR. Karaginan dihasilkan melalui ekstraksi secara alkali dengan pemanasan KOH, pre-treatment alkali dengan perendaman KOH sebelum pemanasan dan ekstraksi native pemanasan dengan air suling. Hasil penelitian didapatkan nilai rendemen terbaik dengan metode alkali (36,68±2,33%). Kadar air terbaik metode pre-treatment (3,91±0,84%). Kadar abu terbaik metode alkali (32,7±2,42%). Kekuatan gel terbaik dengan metode alkali (519±29,01g/cm2). Viskositas terbaik metode native (70,43±0,74 cPs). Hasil FTIR menunjukkan sampel yang dihasilkan jenis kappa karaginan. Kappaphycus alvarezii produces carrageenan which is widely used for industrial and obtained through extraction. Generally the extraction is using an alkaline solution as a solvent of heating or soaking process. Extraction without alkaline solution is infrequently performed. Different extraction methods affect the quality of the carrageenan, therefore the research has to be done. The purpose of this research is to obtain the best quality carrageenan from 3 different extraction methods. The parameters performed yield, water content, ash content, gel strength, viscosity and FTIR analysis. Carrageenan are produced through alkaline extraction treatment with KOH, pre-treatment alkaline with KOH and native extraction with distilled water. The results showed the best yield was alkaline method (36.68±2.33%), the best water content was pre-treatment method (3.91±0.84%), the best ash content was the alkaline method (32.7±2.42%), the best gel strength was the alkaline method (519 ± 29.01g/cm2), the best viscosity was the native method (70.43±0.74 cPs). Analysis FTIR showed the samples produced kappa carrageenan.

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Impact of KOH Compound Immersion on Mechanical Properties of Sansivera Fiber Composite

Ramadhani,

Widodo

2023

ijins

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This study investigates the influence of immersing sansivera fibers in varying ratios of KOH compounds on the mechanical properties of the composite. The methods involve KOH preparation, composite fabrication, and tensile testing with six specimens. Results indicate that a 20% KOH mixture yields the highest values: tensile stress strength of 275N/mm², tensile strain of 3.7mm, elastic modulus of 4910.7N/mm², and maximum load of 42.3N. The immersion of sansivera fibers in the KOH compound mixture significantly affects the composite's mechanical characteristics. Highlights: Study on the impact of KOH compound immersion on mechanical properties of the composite. Varying KOH compound ratios (10%-60%) and their influence on tensile stress strength, elastic modulus, and maximum load. Identification of the optimal 20% KOH mixture with the highest mechanical properties.

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Peranan Kalium Hidroksida (KOH) Terhadap Mutu Karaginan Eucheuma cottonii di Indonesia

Cited by 3 publications

References 0 publications

Effects of Alkaline Solvent Type and pH on Solid Physical Properties of Carrageenan from Eucheuma cottonii

Effects of Alkaline Solvent Type and pH on Solid Physical Properties of Carrageenan from Eucheuma cottonii

Analisis Parameter Fisika dan Kimia Karaginan Kappaphycus alvarezii Doty 1985 (Florideophyceae : Solieriaceae) Dengan Variasi Ekstraksi dari Perairan Bluto

Impact of KOH Compound Immersion on Mechanical Properties of Sansivera Fiber Composite

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