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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) Akta Kimia Indonesia Indonesian Journal of Chemical Analysis (IJCA) Jurnal Teknik Kimia dan Lingkungan International Journal of Renewable Energy Development Jurnal Polimesin
Tri Esti Purbaningtias
Universitas Islam Indonesia
Automotive Engineering 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
Co-Authors Abdul Hamid Abdullah, Mohammad Aishah Abdul Jalil 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 Didik Prasetyo Didik Prasetyoko Dini, Sekti Kartika Djoko Hartanto Djoko Hartanto Faizatur Rohmah Fatah, Misbakhul Febriana, Ike Dayi Fikri, Mohammad Anas Hamzah Fansuri 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 Rahmawati, Zeni Ratna Ediati Reni Banowati Istiningrum, Reni Banowati Rofi'atun Nashriyah ROHMAH, FAIZATUR Romadhonsyah, Fitra Rudy Syahputra Saiful, S. Sandy Septian Dwi Wijaya Sugeng Triwahyono Suprapto Suprapto Syafa, Muhammad Badrus Thorikul Huda tri wahyuni Wiyantoko, Bayu Wiyantoko, Bayu Yorfan Ruwindya Yoshifumi Chisaki Yusuf Muhammad Zein Zeni Rahmawati