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All Journal Science and Technology Indonesia COMPTON: Jurnal Ilmiah Pendidikan Fisika
Euis Nursa’adah
Unknown Affiliation
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Education Environmental Science Materials Science & Nanotechnology Physics

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Facile Detection of Oil Adulteration using UV-Visible Spectroscopy Coupled with Chemometrics Analysis Nina Gusti; Dinda Oktarina; Rina Elvia; Euis Nursa’adah; Rendy W Wardhana; Agus Sudaryono; M. Lutfi Firdaus
Science and Technology Indonesia Vol. 6 No. 1 (2021): January
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1587.291 KB) | DOI: 10.26554/sti.2021.6.1.14-18

Abstract

Engine and machine oils, better known as lubricant, is a fast-moving part within the motorcycle and automobile industries. Due to its high demand, these oils are often counterfeited by irresponsible people to get more profit. The thing most often done to adulterate oil is by mixing it with other low-quality or used oil. Here, we propose a simple analytical method to identify oil adulteration by using UV-Visible spectroscopy. A number of 425 genuine and adulterated oils were used as samples. After appropriate dilution using n-hexane, the samples were analyzed by UV-Visible spectrophotometer followed by Principle Component Analysis (PCA) and Principle Component Regression (PCR) as part of the chemometrics analysis. The results show that prediction samples were accurately classified into their corresponding groups with PCA scores of 49% and 27% for principal component 1 and 2, respectively. PLS model achieved a good prediction to detect lubricant oil adulteration, with R-Square of predicted and reference samples were 0.9257 and 0.9204, respectively. The proposed method shows a promising alternative to the conventional chemical method using a more sophisticated instruments such as GC-MS and HPLC for oil or other organic compound identification.
Rekontruksi Manual Book Berbasis Etnosains tentang Kadar Sianida dan Kandungan Nutrisi Lemea Terintegrasi Bioteknologi untuk Meningkatkan Keterampilan Proses Siswa SMP Roleka Julia Marcellina; Bhakti Karyadi; Rendy Wikrama Wardana; Euis Nursa’adah; Afrizal Mayub
COMPTON: Jurnal Ilmiah Pendidikan Fisika Vol 11 No 2 (2025): Compton: Jurnal Ilmiah Pendidikan Fisika
Publisher : Prodi Pendidikan Fisika Universitas Sarjanawiyata Tamansiswa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30738/cjipf.v11i2.20421

Abstract

This study aims to develop an ethnoscience-based guidebook by integrating lemea fermentation as a local context in biotechnology learning to improve junior high school students' science process skills. The development model used is ADDIE with a quasi-experimental design of non-equivalent control groups. The research subjects consisted of 48 ninth-grade students from SMPN 02 Lebong, divided into experimental and control groups. Research instruments included observation, expert validation, pretest, posttest, and questionnaires. Validation results indicated product feasibility of 92% (very feasible category). Effectiveness testing using an independent t-test showed a significant difference between the experimental and control groups (Sig. 0.000 < 0.05), with an average N-Gain of 0.43 (moderate) in the experimental group and 0.17 (low) in the control group. The effect of media use on science process skills was moderate. Student and teacher responses to the media were very positive, particularly in terms of appearance, content, and usefulness. These results indicate that the integration of local culture into science is effective in developing students' scientific skills in a contextual manner.
Co-Authors Afrizal Mayub Agus Sudaryono BHAKTI KARYADI Dinda Oktarina M. Lutfi Firdaus Nina Gusti Rendy W Wardhana Rendy Wikrama Wardana Rina Elvia Roleka Julia Marcellina