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All Journal Indonesian Journal of Chemistry JMM (Jurnal Masyarakat Mandiri) Widya Teknik
Gunarto, Chintya
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Chemical Engineering, Chemistry & Bioengineering Chemistry Other

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Pseudoternary Phase Diagram and Antibacterial Activity of Microemulsion-Based Citronella Oil Gunarto, Chintya; Go, Alchris Woo; Angkawijaya, Artik Elisa; Lie, Jenni; Soetaredjo, Felycia Edi; Ismadji, Suryadi; Puspitasari, Nathania; Putro, Jindrayani Nyoo; Risdian, Chandra
Indonesian Journal of Chemistry Vol 24, No 3 (2024)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.93250

Abstract

Citronella oil (CTO) is extracted from citronella leaves by maceration or steam distillation process, which has antibacterial and insect-repellent activities. However, the use of CTO is limited and requires modification in other formulations, such as microemulsion (ME), to increase its bioactivities. ME consists of oil, water, surfactant and/or cosurfactant and is commonly applied in food and beverages, cosmetics, and carrier for drug delivery applications. CTO was used as the oil phase for ME with nonionic surfactant and ethanol as a cosurfactant for lowering interfacial tension between oil and water phase. Subsequent observations regarding stability and antibacterial tests were carried out on ME formulations with surfactant/cosurfactant mixture of 2 due to its largest ME area. A hydrodynamic diameter analysis was also carried out to see the stability of the ME within a period of 50 d. ME with 10% CTO, 30% surfactant mixture, and 60% water showed the best formulation observed from the consistent hydrodynamic diameter measurement. In addition, ME with different formulations could inhibit the growth of Escherichia coli and Staphylococcus aureus by more than 90%. From this research, CTO-based ME potentially improve and develop drug carrier applications, especially via topical route.
Optimum and Green Fabrication of MIL-100(Fe) for Crystal Violet Dye Removal from Aqueous Solution Wijaya, Christian Julius; Soetaredjo, Felycia Edi; Yuliana, Maria; Santoso, Shella Permatasari; Hartono, Sandy Budi; Irawaty, Wenny; Lie, Jenni; Putro, Jindrayani Nyoo; Gunarto, Chintya; Puspitasari, Nathania; Ismadji, Suryadi; Gunawan, Setiyo
Indonesian Journal of Chemistry Vol 24, No 5 (2024)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.93323

Abstract

MIL-100(Fe) was prepared and subsequently used to remove crystal violet dye from aqueous solutions simulating dye-containing wastewater in the environment. In the future, it is aimed that MIL-100(Fe) can be used in managing dye-containing wastewater in the environment and reducing the negative impacts it can cause. Here, MIL-100(Fe) fabrication needs to be optimized to obtain optimum process conditions, which are environmentally friendly and can produce MIL-100(Fe) with the best characteristics. This study focused on optimizing the fabrication of MIL-100(Fe), which is a type of MOF with good chemical stability, thermal stability, and flexible structure. In this study, the room-temperature fabrication of MIL-100(Fe) was established using a ligand-to-metal molar ratio of 0.95 and an acetic acid concentration of 5.1 vol% for 6.2 h. The optimum MIL-100(Fe) was tested for crystal violet removal and provided an optimum removal capacity of 182.66 ± 3.81 mg/g. Statistical approaches are used to investigate the independent parameters and their interactions contributing to MIL-100(Fe) formation.
A Review of the Development and Role of Heterogeneous Catalysts for Biodiesel Production Yuliana, Maria; Ismadji, Suryadi; Wijaya, Christian Julius; Soetaredjo, Felycia Edi; Gunarto, Chintya; Santoso, Shella Permatasari; Putro, Jindrayani Nyoo; Anggorowati, Adriana Anteng; Lourentius, Suratno
Widya Teknik Vol. 23 No. 1 (2024): May
Publisher : Fakultas Teknik, Universitas Katolik Widya Mandala Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33508/wt.v23i1.5453

Abstract

Indonesian regulations regarding the implementation of B30 encourage a significant increase in biodiesel demand. Moreover, this implementation will continue to be increased to B35 in 2025 and is projected to reach B100 in 2045. This high demand for biodiesel needs to be supported by the development of adequate biodiesel production technology where the catalyst is one aspect that plays an important role in biodiesel production. The use of catalysts aims to accelerate biodiesel production so that high biodiesel yields and good quality are achieved. In biodiesel production, the choice of catalyst greatly influences the operating conditions, the products produced, the subsequent purification process, and the environmental impacts. Moreover, the changing trend in biodiesel raw materials from food to non-food ingredients requires the development of catalysts that are more suitable for the raw materials used in biodiesel production. The specific characteristics of each catalyst play an important role in the transesterification reaction to produce biodiesel where this needs to be supported and adapted to optimum operating conditions, especially in terms of alcohol-to-oil molar ratio, catalyst amount, temperature, pressure, and reaction time. This review provides a comprehensive overview of the various heterogeneous catalysts used to assist the transesterification reactions in biodiesel production.
IMPLEMENTASI SISTEM PENYIRAMAN BERBASIS INTERNET OF THINGS DAN PENGEMBANGAN WEBSITE KELEMBAGAAN DALAM PENGUATAN OPERASIONAL PERTANIAN GREENHOUSE Wijaya, Christian Julius; Asrini, Luh Juni; Miyata, Andrew Febrian; Indrawati, Chatarina Dian; Gunarto, Chintya; Kusumo, Catherine Tjondro; Willyanto, Hubertus Carmelo Dinar; Wangsawidjaja, Dustin Pranata; Daniel, Daniel
JMM (Jurnal Masyarakat Mandiri) Vol 10, No 2 (2026): April
Publisher : Universitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/jmm.v10i2.38424

Abstract

Abstrak: Pengabdian kepada masyarakat (ABDIMAS) ini berangkat dari permasalahan sistem penyiraman dalam greenhouse yang masih dilakukan secara manual dan keterbatasan media informasi digital pada suatu pusat edukasi pertanian di Jawa Timur. Kegiatan ini melibatkan 5 orang pengelola lembaga sebagai mitra ABDIMAS. Kegiatan ini bertujuan meningkatkan efisiensi operasional greenhouse sekaligus memperkuat kapasitas kelembagaan melalui pemanfaatan teknologi digital yang mudah dioperasikan. Metode pelaksanaan menggunakan pendekatan deskriptif–implementatif melalui tahapan observasi dan perencanaan, implementasi solusi teknologi, dan evaluasi kualitatif berbasis pemantauan dan diskusi bersama mitra. Hasil kegiatan menunjukkan bahwa penerapan sistem penyiraman berbasis Internet of Things (IoT) mampu menghadirkan kendali penyiraman yang lebih terpusat, efisien, dan terjadwal, sementara pengembangan website resmi lembaga berhasil memperluas akses informasi, edukasi, dan publikasi kegiatan kepada masyarakat. Kegiatan ini tidak hanya mengimplementasikan teknologi dan platform digital, tetapi juga mendorong peningkatan literasi teknologi dan kemandirian mitra dalam mengelola inovasi secara berkelanjutan.Abstract: This community service (ABDIMAS) stems from the problem of the watering system in the greenhouse which is still done manually and the limited digital information media at an agricultural education center in East Java. This activity involved 5 institutional managers as the ABDIMAS partner. This activity aims to increase greenhouse operational efficiency while strengthening institutional capacity through the use of easy-to-operate digital technology. The implementation method uses a descriptive–implementative approach through the stages of observation and planning, implementation of technological solutions, and qualitative evaluation based on monitoring and discussions with partners. The results of the activity showed that the implementation of an Internet of Things (IoT)-based watering system was able to provide more centralized, efficient, and scheduled watering control, while the development of the institution's official website succeeded in expanding access to information, education, and publication of activities to the public. This activity not only implements digital technology and platforms, but also encourages increased technological literacy and partner independence in managing innovation sustainably.
Co-Authors Adriana Anteng Anggorowati Angkawijaya, Artik Elisa Asrini, Luh Juni Chandra Risdian Chatarina Dian Indrawati Daniel Daniel Felycia Edi Soetaredjo Go, Alchris Woo Hartono, Sandy Budi Kusumo, Catherine Tjondro Lie, Jenni Lourentius, Suratno Miyata, Andrew Febrian Puspitasari, Nathania Putro, Jindrayani Nyoo Santoso, Shella Permatasari Setiyo Gunawan Suryadi Ismadji Wangsawidjaja, Dustin Pranata Wenny Irawaty Wijaya, Christian Julius Willyanto, Hubertus Carmelo Dinar Yuliana, Maria