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All Journal Jurnal Crystal : Publikasi Penelitian Kimia dan Terapannya
Gading Bagus Mahardika
Politeknik Negeri Samarinda
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering

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ADHESIVE BEHAVIOR OF POLYCAPROLACTONE/HYDROXYAPATITE COATINGS ON 316L STAINLESS STEEL: A DESIGN OF EXPERIMENTS APPROACH Agung Prabowo; Ahmad Fadli; Heni Sugesti; Muh Irwan; Syarifuddin Oko; Gading Bagus Mahardika; Marlinda
Jurnal Crystal : Publikasi Penelitian Kimia dan Terapannya Vol. 7 No. 2 (2025): Literasi Artikel Penelitian Kimia
Publisher : Program Studi Kimia, Fakultas MIPA, Universitas PGRI Banyuwangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36526/jc.v7i2.6212

Abstract

Enhancing the adhesive strength of bioactive coatings is crucial for improving the mechanical stability of metallic implants. This study investigates the effects of three processing parameters—sonication temperature (X₁), PCL/HA ratio (X₂), and drying time (X₃)—on the adhesive strength of poly(ε-caprolactone)/hydroxyapatite (PCL/HA) composite coatings applied to 316L stainless steel substrates. A full factorial 23 experimental design was employed, and the results were analyzed using analysis of variance (ANOVA) and regression modeling. The adhesive strength response ranged from 19.62 MPa to 63.27 MPa. Among the factors studied, the PCL/HA ratio had the most significant positive effect, while drying time showed a minor influence. Interaction plots and response surface analyses revealed a synergistic effect between sonication temperature and PCL/HA ratio, contributing to improved bonding at the coating-substrate interface. The optimization results yielded a predicted maximum adhesive strength of 25.76 MPa at a desirability score of 0.03, highlighting the complexity of parameter interactions. These findings underscore the importance of processing conditions in tailoring coating performance for biomedical applications.
GC–MS CHARACTERIZATION OF FATTY ACID ALKYL ESTERS IN BIODIESEL PRODUCED FROM WASTE COOKING OIL Gading Bagus Mahardika; Agung Prabowo; Syarifuddin Oko; Muh Irwan; Alvyano
Jurnal Crystal : Publikasi Penelitian Kimia dan Terapannya Vol. 8 No. 1 (2026): Literasi Artikel Penelitian Kimia
Publisher : Program Studi Kimia, Fakultas MIPA, Universitas PGRI Banyuwangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36526/jc.v8i1.6976

Abstract

This study aims to identify and characterize the major compounds in biodiesel produced through the transesterification of vegetable oils using Gas Chromatography–Mass Spectrometry (GC–MS). The analysis was conducted to evaluate the composition of fatty acid esters—specifically Fatty Acid Methyl Esters (FAME) and Fatty Acid Ethyl Esters (FAEE)—which play a crucial role in determining biodiesel quality. Three biodiesel samples were analyzed, revealing dominant peaks at retention times between 15 and 17 minutes, identified as methyl palmitate (C₁₇H₃₄O₂), methyl oleate (C₁₉H₃₆O₂), and methyl stearate (C₁₉H₃₈O₂). The total content of these major esters ranged from 85% to 92%, indicating an efficient conversion of triglycerides into esters. The resulting chemical profile exhibited a balanced proportion of saturated and unsaturated compounds, providing high oxidative stability and favorable cold flow properties. These findings demonstrate that the produced biodiesel meets the requirements of international standards ASTM D6751 and EN 14214, confirming its potential as an environmentally friendly alternative fuel.
Co-Authors Agung Prabowo Ahmad Fadli Alvyano Heni Sugesti Marlinda Muh Irwan Syarifuddin Oko