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All Journal INDONESIAN JOURNAL OF APPLIED PHYSICS Indonesian Journal of Pure and Applied Chemistry
Harlia, Harlia
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Astronomy Biochemistry, Genetics & Molecular Biology Chemistry Energy Materials Science & Nanotechnology Physics

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ISOLASI DAN KARAKTERISASI SENYAWA STEROID FRAKSI n-HEKSANA TERIPANG HITAM (Holothuria atra) ASAL PERAIRAN LEMUKUTAN KALIMANTAN BARAT Abrori, Sayyidus Dzaki; Sapar, Ajuk; Gusrizal, Gusrizal; Harlia, Harlia; Prayitno, Dwi Imam
Indonesian Journal of Pure and Applied Chemistry Vol 8, No 1 (2025)
Publisher : Tanjungpura University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/indonesian.v8i1.88526

Abstract

Black sea cucumber Holothuria atra is a marine organism from the family Holothuriidae, a source for developing raw pharmaceutical materials, and is abundant in the waters of Lemukutan Island. This study aims to identify steroid compounds from the n-hexane fraction of the black sea cucumber (H. atra) from Lemukutan waters using FTIR and ¹H-NMR instruments. The steps involved in this study include extraction (maceration and partition), phytochemical tests, fractionation (column chromatography), purification, and molecular structure identification. Phytochemical analysis of the n-hexane fraction of H. atra sea cucumber revealed the presence of secondary metabolites belonging to the groups of steroids, alkaloids, phenolics, terpenoids, and saponins. The result of the isolation was a relatively pure isolate with a weight of 0.0303 grams, yellowish white in color, and suspected to be a steroid compound. The results of the n-hexane fraction identification using FTIR showed the presence of several functional groups found in steroid compounds, such as aliphatic C-H bonds, olefinic =C-H bonds, C-O group, C=O group, C=C bond, and OH (hydroxyl) group. The results of the isolate identification using the ¹H-NMR instrument (500 MHz, CDCl₃) showed chemical shift similarities to the β-sitosterol compound from two different references.
Synthesis and Characterization of Adsorbent Magnetic Kaolin Harlia, Harlia; Wahyuni, Nelly
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 15, No 2 (2025): October
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v15i2.93849

Abstract

Kaolin as an adsorbent has difficulties separating it from the adsorbate solution because it requires centrifugation and precipitation methods, which require significant costs, time, and energy. Modification of kaolin with magnetite was carried out to increase the effectiveness of adsorption from the paracetamol solution. Kaolin-magnetite (KM) adsorbent was made by combining activated kaolin and Fe(III)/Fe(II) solution with a mole ratio of 2:1 using the coprecipitation method. The resulting activated kaolin, magnetite, and kaolin-magnetite were characterized using X-ray Fluorescence (XRF), X-ray Diffractometer (XRD), Fourier Transform Infrared (FTIR), Gas Sorption Analyzer (GSA), and Vibrating Sample Magnetometer (VSM). The presence of magnetite makes it easier to separate KM from the paracetamol solution, with 97.17% of KM being taken by the magnetic rod.
Co-Authors Abrori, Sayyidus Dzaki Ajuk Sapar Gusrizal Gusrizal Nelly Wahyuni Prayitno, Dwi Imam