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All Journal Jurnal Ilmiah Farmasi EKSAKTA: Journal of Sciences and Data Analysis Jurnal Ilmu Dasar Jurnal Sains dan Teknologi Indonesian Journal of Chemistry IJCER (International Journal of Chemistry Education Research) Indonesian Journal of Pure and Applied Chemistry Akta Kimia Indonesia Indonesian Journal of Chemical Analysis (IJCA) Indonesian Journal of Chemical Science and Technology Jurnal Teknik Kimia dan Lingkungan International Journal of Renewable Energy Development Jurnal Polimesin
Tri Esti Purbaningtias
Universitas Islam Indonesia
Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology

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Waste cooking oil biodiesel via a sodium hydroxide-catalyzed transesterification process: effects on diesel engine performance and emissions Hamid, Abdul; Syafa, Muhammad Badrus; Fatah, Misbakhul; Jakfar, Amin; Rahmawati, Zeni; Purbaningtias, Tri Esti; Fikri, Mohammad Anas; Rohmah, Faizatur; Wilujeng, Auliana Diah
Jurnal Polimesin Vol 23, No 5 (2025): October
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i5.7374

Abstract

This study reports the synthesis of biodiesel from locally sourced Waste Cooking Oil (WCO) using sodium hydroxide (NaOH) catalyst. The main objective of this research is to assess the feasibility of utilizing WCO-based biodiesel as a sustainable alternative fuel by analyzing its physicochemical properties and application in a Yanmar® TF 70 LY-DI diesel engine. The production process involved degumming, acid-catalyzed esterification, and base-catalyzed transesterification to address the high free fatty acid content of WCO. The resulting biodiesel met ASTM D6751 standards, with a kinematic viscosity of 5.06 cSt, a flash point of 164°C, a density of 885 kg/m3, a FAME yield of 98.17%, and an acid number of 0.12 mg-KOH/g. Engine tests were performed using blends from B10 to B40 and benchmarked against pure diesel. Results showed that B10 and B20 blends maintained comparable engine performance, while higher blends (B30–B40) exhibited reductions in power and torque and increased Specific Fuel Consumption (SFC). CO emissions decreased significantly with increasing biodiesel content, whereas NO and NOx emissions rose due to higher combustion temperatures. These findings demonstrate the technical feasibility and environmental benefits of WCO-derived biodiesel, particularly at lower blend ratios (≤ B20), as a locally available and sustainable fuel. The study is limited to laboratory-scale testing on a single-cylinder engine without long-term durability assessments, which should be addressed in future studies.
Optimization of Biodiesel Production from Sunflower Oil Using Sodalite-Based Catalyst via Taguchi Method Hamid, Abdul; Jakfar, Amin; Rahmawati, Zeni; Armansyah, Muhammad Doni; Wahyuni, Tri; Purbaningtias, Tri Esti; Febriana, Ike Dayi; Abdullah, Mohammad; Ilmah, Aurista Miftahatul; Rohmah, Faizatur
Jurnal Teknik Kimia dan Lingkungan Vol. 9 No. 2 (2025): October 2025
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33795/jtkl.v9i2.7345

Abstract

The growing demand for alternative fuels has highlighted biodiesel as sustainable substitute for fossil diesel. In this study, biodiesel was produced from sunflower seed oil using heterogeneous catalyst synthesized from natural kaolin into sodalite via hydrothermal process. The synthesized catalyst was characterized using XRD, FTIR and SEM-EDS, confirming the transformation of kaolinite to sodalite. The transesterification reaction was conducted under varying methanol-to-oil molar ratios (1:12, 1:18, and 1:24) and temperatures (60, 65, and 70°C). A Taguchi orthogonal array (L9) was employed to statistically evaluate the effects of these parameters on methyl ester yield. Experimental results showed that both methanol ratio and reaction temperature significantly influenced biodiesel yield, with the highest yield of 90.44% obtained at 70°C and 1:18 molar ratio. Signal-to-noise ratio and ANOVA analysis indicated that the methanol-to-oil ratio was the most dominant factor (46.05%) compared to temperature (40.55%). The resulting biodiesel exhibited a flash point of 158°C, acid value of 0.06 mg-KOH/g, and iodine value of 84.06 g-I₂/100g, satisfying most ASTM D6751 and SNI 7182:2015 standards, though viscosity and density exceeded standard limits. Emission testing showed 16% reduction in CO emissions with increasing biodiesel blends, while NO and NOx emissions slightly increased.
UJI STABILITAS FISIK DAN EFEKTIVITAS ANTIBAKTERI PADA PERESEPAN PUYER ERITROMISIN CHEWABLE TERHADAP BAKTERI Escherichia coli DAN Staphylococcus aureus Herawati, Mutiara; Indrati, Oktavia; Romadhonsyah, Fitra; Purbaningtias, Tri Esti; Dini, Sekti Kartika; Rahmadani, Yusi; Mardatillah, Wahidatun
Jurnal Ilmiah Farmasi Vol. 20 No. 1 (2024): Jurnal Ilmiah Farmasi
Publisher : Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/jif.vol20.iss1.art6

Abstract

Background: Pediatric patients frequently receive prescriptions for erythromycin due to its availability in chewable tablet form. Some conditions lead to the powdering of chewable tablets to enhance patient acceptability. Modifying the dosage form of chewable tablets into powder can change the drug's surface, affecting its physical stability and effectiveness against bacteria.Objective: This study aims to determine the physical stability of divided powder and the effectiveness of erythromycin pulveres against E. coli and S. aureus on the 1st to 14th days.Method: For this study, we prepared up to 200 mg of erythromycin powder, typically administering it to pneumonia patients at a dose of 50 mg/kgBW/day. We will evaluate pulveres physical stability through organoleptic and humidity tests. Next, the powder's effectiveness was evaluated using the disk diffusion method (Kirby Bauer) with an erythromycin powder inhibition zone diameter of 25.65 μg containing 15 μg of erythromycin against E. coli and S. aureus bacteria.Results: After day 9, the organoleptic test results showed a slight hardening; however, the moisture balance test results showed the change in humidity percentage was still in the stable range (1.24-2.12%). The inhibition zone (DIZ) of erythromycin powder against S. aureus was 91.7–97.40% bigger than the positive control. The DIZ against E. coli was 44.6–88.70% bigger than the positive control.Conclusion: Erthyromycin powder was stable for 14 days and is effective against S. aureus bacteria.Keywords: Erythromycin, divided powder, S. aureus, E. coli Intisari Latar belakang: Eritromisin sering diresepkan untuk pasien pediatrik karena tersedia dalam bentuk tablet kunyah. Pada beberapa kondisi, tablet kunyah dibuat puyer untuk meningkatkan kenyamanan pasien dalam mengonsumsi obat. Perubahan bentuk sediaan tablet kunyah menjadi puyer dapat memperluas permukaan obat sehingga berisiko mempengaruhi stabilitas fisik sediaan dan efektivitasnya terhadap suatu bakteri. Tujuan: Penelitian ini bertujuan untuk mengetahui stabilitas fisik puyer dan efektivitas puyer eritromisin terhadap E. coli dan S. aureus pada hari ke-1 sampai ke-14.Metode: pengujian ini dilakukan dengan membuat puyer eritromisin dalam dosis 200 mg yang biasa diberikan untuk pasien pneumonia dengan dosis 50 mg/kgBB/hari. Puyer akan diuji stabilitas fisiknya melalui uji organoleptis dan kelembaban. Selanjutnya puyer diuji efektivitasnya menggunakan metode difusi cakram (Kirby Bauer) dengan mengukur diameter zona hambat puyer eritromisin 25,65 μg yang mengandung eritromisin 15 μg terhadap bakteri E. coli dan S. aureus.Hasil: Hasil uji organoleptis menunjukkan adanya sedikit pengerasan setelah hari ke 9 namun hasil uji moisture balance menunjukkan perubahan persentase kelembaban masih pada rentang stabil (1,24-2,12%). Daya hambat puyer eritromisin terhadap S. aureus sebesar 91,7-97,40% dibandingkan kontrol positif, sementara itu, daya hambat terhadap E. Coli berada pada rentang 44,6-88,70. Kesimpulan: Puyer ertiromisin stabil selama 14 hari dan efektif terhadap bakteri S. aureus. Kata kunci: Eritromisin, puyer, S. aureus, E. coli
Determination of Lead (Pb) Content in Commercial Fruit Juice Drinks Using Atomic Absorption Spectroscopy with Standard Addition Method Yorfan Ruwindya; Desta Aulia Putri; Hana Mayarana; Tri Esti Purbaningtias
Indonesian Journal of Chemical Science and Technology (IJCST) Vol. 9 No. 2 (2026): JULY 2026
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v9i2.76235

Abstract

Lead (Pb) is one of the most hazardous heavy metals that may contaminate fruit juice through environmental pollution, raw materials, processing, and packaging. Continuous exposure to Pb poses significant health risks due to its cumulative toxicity. This study aimed to determine the Pb concentration in commercially packaged fruit juice using Atomic Absorption Spectroscopy (AAS). Samples were prepared by wet digestion using nitric acid, followed by Pb determination employing the standard addition method to minimize matrix interference. The analytical method was evaluated through linearity, limit of detection (LOD), limit of quantification (LOQ), precision, and accuracy. The calibration curve exhibited excellent linearity within the investigated concentration range. The Pb concentration in the analyzed sample was found to be 0.15 mg kg⁻¹, which is below the maximum permissible limit established by the Indonesian National Standard (SNI 3719:2014). The method showed satisfactory analytical performance with an LOD of 0.1773 mg L⁻¹, an LOQ of 0.5910 mg L⁻¹, a relative percent difference (RPD) of 2.33%, and a recovery of 105.73%. These results demonstrate that the standard-addition AAS method provides a reliable quantitative determination of Pb in fruit juice matrices.
PENENTUAN PROTEIN KASAR PAKAN KUCING KOMERSIAL MENGGUNAKAN METODE KJELDAHL DAN EVALUASI KESESUAIAN INFORMASI LABEL Alhannawi, Miyadah; Rahmadhani, Zahra Putri; Ruwindya, Yorfan; Purbaningtias, Tri Esti
Indonesian Journal of Pure and Applied Chemistry Vol. 9 No. 2 (2026)
Publisher : Tanjungpura University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/indonesian.v9i2.104783

Abstract

Protein is a vital nutrient in cat food, supporting growth, tissue maintenance, and physiological functions. This study aimed to determine nitrogen and crude protein contents in commercial cat foods and evaluate their conformity with label claims using the Kjeldahl method. Three dry cat foods representing economy (A), mid-range (B), and premium (C) categories were analyzed according to AOAC 2011.11 through digestion, distillation, and titration, followed by conversion of total nitrogen to crude protein. The average nitrogen contents (±SD) were 5.2887 ± 0.0021%, 5.2817 ± 0.0021%, and 6.1503 ± 0.0023% for samples A, B, and C, respectively, corresponding to crude protein contents of 33.05 ± 0.01%, 33.02 ± 0.02%, and 38.45 ± 0.01%. All measured values exceeded their respective label claims, with deviations of 3.05%, 3.02%, and 0.45% for samples A, B, and C. One-way ANOVA showed significant differences in protein content among samples (p < 0.05). At the same time, one-sample t-tests indicated significant differences between measured values and label claims (p < 0.05). The low %RSD (<0.05%) demonstrated good analytical precision. Overall, higher-priced cat food showed higher crude protein content, while all products exceeded their labeled protein levels and met minimum protein requirements for adult cats.
Co-Authors Abdul Hamid Abdullah, Mohammad Aishah Abdul Jalil Alhannawi, Miyadah Amin Jakfar, S.T.,M.T., Lukman Hadiwijaya, S.T.,M.T. Arief Fadlan Armansyah, Muhammad Doni Auliana Diah Wilujeng Aurista Miftahatul Ilmah Bagoes Wibowo Bayu Wiyantoko Bayu Wiyantoko Bayu Wiyantoko Che Ku Nor Liana Che Ku Hitam Cicik Herlina Yulianti Desta Aulia Putri Didik Prasetyo Didik Prasetyoko Dini, Sekti Kartika Djoko Hartanto Djoko Hartanto Faizatur Rohmah Fatah, Misbakhul Febriana, Ike Dayi Fikri, Mohammad Anas Hamzah Fansuri Hana Mayarana Hanik Alfanah Hasliza Bahruji Ida Ayu Putu Sri Widnyani Ike Dayi Febriana Ike Dayi Febriana Imroatul Qoniah Jakfar, Amin Kurniawati, Puji Kurniawati, Puji Mardatillah, Wahidatun Miranda, Suci Mohammad Abdullah Mustika Kusuma Sari Mutiara Herawati, Mutiara Oktavia Indrati, Oktavia Puji Kurniawati Rahmadani, Yusi Rahmadhani, Zahra Putri Rahmawati, Zeni Ratna Ediati Reni Banowati Istiningrum, Reni Banowati Rofi'atun Nashriyah ROHMAH, FAIZATUR Romadhonsyah, Fitra Rudy Syahputra Ruwindya, Yorfan Saiful, S. Sandy Septian Dwi Wijaya Sugeng Triwahyono Suprapto Suprapto Syafa, Muhammad Badrus Thorikul Huda tri wahyuni Wiyantoko, Bayu Wiyantoko, Bayu Yorfan Ruwindya Yorfan Ruwindya Yoshifumi Chisaki Yusuf Muhammad Zein Zeni Rahmawati