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All Journal Jambura Journal of Educational Chemistry Jurnal Akademika Kimia Damhil: Jurnal Pengabdian kepada Masyarakat
Arviani Arviani
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Chemistry Education Other

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Analysis of Calcium Content in Tuna Bones Using an Enzymatic Method I M.W. Wijaya; Erni Mohammad; Najmah Najmah; Netty I. Ischak; Arviani Arviani
Jurnal Akademika Kimia Vol. 15 No. 1 (2026)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2026.v15.i1.pp70-76

Abstract

Bone waste of mackerel tuna (Euthynnus affinis) has great potential as a natural source of calcium. The enzymatic approach using papain offers a safe, environmentally friendly method for green extraction. This study aims to evaluate the effects of variations in papain concentration on the yield and calcium content of cod fish bone hydrolysis. The method used was a one-factor Complete Random Design with four levels of papain concentration (6, 8, 10, and 12 %) and three replicates. Hydrolysis is carried out at 60 °C and pH 6.5 for 4 hours. Calcium levels were analyzed using an Atomic Absorption Spectrophotometer (SSA) at a wavelength of 422 nm. ANOVA showed that papain concentration had a significant effect on yield (p < 0.05) but not on calcium content (p > 0.05). The highest yield, 105.66%, was obtained at a 6% concentration and was influenced by post-hydrolysis water retention and residual salt retention from the buffer solution. Meanwhile, the highest calcium release was achieved at a 10% concentration of 165.63 mg/g. Hydrolysis with papain has been shown to effectively degrade the collagen matrix, releasing minerals without damaging the bone's hydroxyapatite structure. Implicitly, this study offers an efficient method for the fishery waste treatment industry to produce alternative calcium supplements, while guiding the optimization of enzyme dosage based on production-target priorities.
Analysis of Senior High School Students’ Misconceptions on Chemical Bonding Using a Three-Tier Diagnostic Test Nur Hairami Idrus; Masrid Pikoli; Erga Kurniawati; Julhim S. Tangio; Mangara Sihaloho; Thayban Thayban; Arviani Arviani; Siti Istiqomah Nggole
Jambura Journal of Educational Chemistry Vol 8, No 2 (2026): August
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/jjec.v8i2.37792

Abstract

This study aims to identify the forms and levels of students’ misconceptions on chemical bonding concepts among Grade XI students at MAN 1 Gorontalo City. The research employed a descriptive quantitative approach using a three-tier diagnostic multiple-choice test consisting of 15 items covering the subtopics of basic chemical bonding concepts, ionic bonding, covalent bonding, metallic bonding, Lewis structures, and intermolecular forces. The participants were 72 Grade XI students who had previously studied chemical bonding. Students’ responses were analyzed based on the combination of answers, reasoning, and confidence levels, and then categorized into five conceptual categories: understanding the concept (PK), misconception type 1 (MK1), misconception type 2 (MK2), misconception type 3 (MK3), and lack of concept understanding (TPK). The results show that students’ overall conceptual understanding was relatively high at 82.78%, while the overall level of misconceptions reached 12.97%. The highest misconception was found in the basic concept of chemical bonding (17.36%), followed by ionic bonding (9.72%), covalent bonding (6.48%), intermolecular forces (6.60%), Lewis structures (4.17%), and metallic bonding (3.47%). Among the misconception categories, MK1 was the most dominant (7.50%), followed by MK3 (3.06%) and MK2 (2.41%). These findings indicate that although most students demonstrate a good level of conceptual understanding, misconceptions remain present in several subtopics of chemical bonding. Therefore, instructional strategies that emphasize conceptual clarification and multiple chemical representations are needed to improve students’ understanding of chemical bonding concepts.
Pelatihan Pembuatan Edible Film sebagai Upaya Penguatan Keterampilan Penelitian Kelompok Siswa SMP Arviani Arviani
Damhil: Jurnal Pengabdian kepada Masyarakat Vol 5, No 1: June 2026
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/damhil.v5i1.40729

Abstract

Edible-film production training was conducted as a community-engagement activity to strengthen the research experience of two students from SMP Negeri 1 Gorontalo through laboratory practice. The activity took place from May to June 2026 at the Chemistry Laboratory, Faculty of Mathematics and Natural Sciences, Universitas Negeri Gorontalo, using corn starch, gelatin, and glycerol as the main materials. The programme employed small-group training and mentoring, including an introduction to edible-film concepts, material functions, laboratory safety, demonstration, guided practice, observation of film formation, and reflection on the experiment. Evaluation was descriptive and based on observations of students’ participation in scientific-work stages. The activity indicates that edible films can provide a contextual research-learning topic connecting polymer concepts, sustainable-packaging issues, and laboratory skills. The small-group format enabled intensive guidance in measuring, mixing, heating, casting, observing, and communicating results. As the activity involved only two students participating in OPSI and employed pre-test and post-test measurements, the findings should be interpreted within the limited scope of the participants. Nevertheless, this activity provides a foundation for developing a more systematic student research mentoring programme supported by measurable evaluation instruments.
Co-Authors Erga Kurniawati Erni Mohammad I M.W. Wijaya Julhim S Tangio Mangara Sihaloho Masrid Pikoli Najmah Najmah Netty I. Ischak Nur Hairami Idrus Siti Istiqomah Nggole Thayban, Thayban