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All Journal Science and Technology Indonesia Sainteks: Jurnal Sain dan Teknik
Roziafanto, Ahmad Nandang
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Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Decision Sciences, Operations Research & Management Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Physics

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Isolation and Characterization of Cellulose Microfibril (MFC) from Gracilaria sp. with Different Quality Grades Nurhayati; Irianto, Hari Eko; Supriyanto, Agus; Kusumawati, Rinta; Basmal, Jamal; Munifah, Ifah; Setiawati, Natalia Prodiana; Kusumaningrum, Wida Banar; Amanda, Putri; Roziafanto, Ahmad Nandang; Riastuti, Rini; Chalid, Muchamad
Science and Technology Indonesia Vol. 10 No. 3 (2025): July
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2025.10.3.712-724

Abstract

The cellulose found in Gracilaria sp. has not been utilized optimally. This study investigated the characteristics of cellulose and cellulose microfibril (MFC) isolated from three grades of Gracilaria sp. Descriptive tests were performed to determine the quality of eachgrade, including observations on moisture content, ashcontent, CAW,andimpurities. The extraction process involved separating agar from Gracilaria sp., isolating cellulose using 10% NaOH, and bleaching cellulose with 3% NaOCl. The bleached cellulose was then ultrasonicated to produce MFC. Characterization was performed using FTIR, XRD, PSA, STA, DSC, and py-GC/MS. FTIR analysis indicated similar peaks for both cellulose forms but only differed in transmittance intensity. The crystallinity index from XRD analysis was 22–39% for raw Gracilaria sp., 25–46% for cellulose, and 68–89% for MFC. The particle size distribution of MFC mostly ranged between 200–500 nm, with 63.16% frequency. TG analysis showed cellulose decomposition with a Tonset of 231–260oC and a Tmax of 318–326oC. DSC analysis revealed that sonication enhances the polymer structure’s crystallization compared to pre-sonicated cellulose and raw material. The py-GC/MS analysis showed that D-allose and n-Hexadecanoic acid were the major components.
Effect of Time and Storage Conditions on the Stability of Citronellal Lotion Puspita, Fitria; Roziafanto, Ahmad Nandang; Saragih, Libora
Sainteks: Jurnal Sain dan Teknik Vol 7 No 02 (2025): September
Publisher : Universitas Insan Cendekia Mandiri

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37577/sainteks.v7i02.910

Abstract

Commercial mosquito repellent lotion containing citronellal was tested for its stability to evaluate changes in the physical and chemical properties of the lotion at various times and storage condistions. This study used three variations of storage conditions; at 25°C, 30°C, 50°C, and sun exposured condition. Storage was carried out for 3 months and testing was carried out once a month for each storage condition. The lotion stability parameters tested included pH, viscosity, and citronellal content. Acidity measurement was carried out using a pH meter. Viscosity measurement was carried out using a Brookfield spindle helipath 96 viscometer at a speed of 12 rpm, while citronellal content measurement was carried out using gas chromatography. The results showed that storage time and temperature had a significant effect on the stability of citronellal lotion. The longer the lotion was stored, the viscosity and citronellal content decreased. In addition, higher storage temperatures also accelerated the decline in lotion stability, showed by significant changes in viscosity and citronellal content. Meanwhile, the pH of the lotion did not change significantly at each variation of storage time and conditions. Keywords: mosquito, repellant, citronellal, stability.
Co-Authors Agus Supriyanto Amanda, Putri Chalid, Muchamad Diana Natalia Hari Eko Irianto Ifah Munifah Jamal Basmal, Jamal Kusumaningrum, Wida Banar Nurhayati Puspita, Fitria Rini Riastuti, Rini Rinta Kusumawati, Rinta Saragih, Libora