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All Journal Jurnal Rekayasa Proses Jurnal Biologi Tropis Jurnal Rekayasa Proses Jurnal Abdimas Mahakam Journal Of Chemical Process Engineering
Erna Astuti
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Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Economics, Econometrics & Finance Education Energy Engineering Immunology & microbiology Law, Crime, Criminology & Criminal Justice Public Health Social Sciences

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Penyuluhan Manfaat dan Pengolahan Tanaman Obat Keluarga di Dusun Tegalsari Kulon Progo Sugihartini, Nining; Erna Astuti; Zainab
Jurnal Abdimas Mahakam Vol. 5 No. 01 (2021): JURNAL ABDIMAS MAHAKAM
Publisher : Institute for Research and Community Services (LPPM)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24903/jam.v5i01.1145

Abstract

Dusun Tegalsari, Purwosari, Girimulyo, Kulon Progo, Daerah Istimewa Yogyakarta memiliki potensi tanaman herbal yang melimpah. Hal tersebut didukung oleh lokasinya yang berada di deretan Bukit Menoreh yang kaya dengan tanaman obat. Pemanfaatan tanaman herbal khususnya selama pandemi mendorong dilakukannya pengabdian masyarakat dengan tema pemanfaatan tanaman obat keluarga untuk mendukung kesehatan masyarakat. Tujuan kegiatan ini adalah meningkatkan pengetahuan masyarakat Tegalsari tentang manfaat tanaman herbal bagi kesehatan dan pembuatan sediaan herbal. Kegiatan dilaksanakan secara daring karena situasi pandemi yang masih berlangsung. Media yang digunakan adalah grup WhatsApp untuk menjalin komunikasi dan koordinasi dengan peserta; googlemeet dan youtube untuk menyampaikan materi; googleclassroom untuk melaksanakan pretes dan postes. Hasil pengabdian masyarakat menunjukkan bahwa terdapat peningkatan pengetahuan tentang manfaat tanaman herbal dan masyarakat mengharapkan program pengabdian masyarakat bisa dilanjutkan secara berkelanjutan agar sampai pada tahap pemanfaatan tanaman herbal yang dapat meningkatkan perekonomian masyarakat.
Pengaruh Konsentrasi Katalisator dan Rasio Bahan terhadap Kualitas Biodiesel dari Minyak Kelapa Erna Astuti
Jurnal Rekayasa Proses Vol 2, No 1 (2008)
Publisher : Departemen Teknik Kimia Fakultas Teknik Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (233.157 KB) | DOI: 10.22146/jrekpros.548

Abstract

Kebutuhan energi di Indonesia dari tahun ke tahun semakin meningkat. Oleh karena itu perlu pengembangan energi alternatif , salah satunya adalah biodiesel. Indonesia sebagai negara penghasil minyak nabati terbesar dunia, juga sebagai negara penghasil minyak kelapa relatif besar dunia mempunyai peluang untuk menghasilkan dan memainkan peranan penting dalam produksi bahan bakar biodiesel. Di antara berbagai jenis minyak nabati, minyak kelapa mempunyai peluang besar untuk digunakan sebagai bahan baku dalam pembuatan biodisel. Penelitian dilakukan dalam labu leher tiga yang dilengkapi motor pengaduk dan termometer. Reaksi transesterifikasi diawali dengan mencampur minyak kelapa yang telah dipanaskan dengan campuran etanol dan katalisator KOH. Reaksi dilakukan selama dua jam dengan variabel proses konsentrasi katalisator 0,65 – 0,95 % b/v dan rasio minyak kelapa/etanol antara 2:1 dan 6:1. Kemudian dilakukan pemisahan biodiesel dari gliserol dan pengeringan. Selanjutnya dilakukan uji sifat biodiesel rapat massa, viskositas, cloud point, flash point dan angka asam. Hasil penelitian menunjukkan bahwa hasil minyak destilat yang relatif baik dan yang masuk dalam spesifikasi standar dan mutu biodiesel diperoleh pada pada konsentrasi katalisator KOH 0,75 – 0,90 %b/v dan rasio minyak kelapa/etanol 3:1 – 5:1. Kata kunci: energi alternatif, biodiesel, transesterifikasi, rasio bahan, standar mutu The demand for energy in Indonesia has increased very fast in the recent years in the midst of fossil oil depletion. A lot of effort has been carried out to find alternative energies. One of the promising alternative energies is biodiesel. Indonesia, as the largest producer of vegetable oil in the world, has an opportunity to play a significant role as a biodiesel producer. Among various vegetable oils, coconut oil is a potential raw material in biodiesel production. The process was carried out in a three-neck round bottom flask equipped with motor stirrer and thermometer. The trans-esterification reaction was conducted by mixing heated coconut oil with a mixture of ethanol and KOH catalyst for two hours. The process variables studied in the present work were catalyst concentration and coconut oil – ethanol ratio. At the optimal condition when the KOH concentration in a range of 0.75-0.90% w/v and a coconut oil – ethanol ratio of 3:1 -5:1, the process produce biodiesel that meets the standard. Key words: alternative energy, biodiesel, trans-esterification, reactant ratio, quality assurance
Pengaruh Konsentrasi Katalisator dan Rasio Bahan terhadap Kualitas Biodiesel dari Minyak Kelapa Erna Astuti
Jurnal Rekayasa Proses Vol 2, No 1 (2008)
Publisher : Departemen Teknik Kimia Fakultas Teknik Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jrekpros.548

Abstract

Kebutuhan energi di Indonesia dari tahun ke tahun semakin meningkat. Oleh karena itu perlu pengembangan energi alternatif , salah satunya adalah biodiesel. Indonesia sebagai negara penghasil minyak nabati terbesar dunia, juga sebagai negara penghasil minyak kelapa relatif besar dunia mempunyai peluang untuk menghasilkan dan memainkan peranan penting dalam produksi bahan bakar biodiesel. Di antara berbagai jenis minyak nabati, minyak kelapa mempunyai peluang besar untuk digunakan sebagai bahan baku dalam pembuatan biodisel. Penelitian dilakukan dalam labu leher tiga yang dilengkapi motor pengaduk dan termometer. Reaksi transesterifikasi diawali dengan mencampur minyak kelapa yang telah dipanaskan dengan campuran etanol dan katalisator KOH. Reaksi dilakukan selama dua jam dengan variabel proses konsentrasi katalisator 0,65 – 0,95 % b/v dan rasio minyak kelapa/etanol antara 2:1 dan 6:1. Kemudian dilakukan pemisahan biodiesel dari gliserol dan pengeringan. Selanjutnya dilakukan uji sifat biodiesel rapat massa, viskositas, cloud point, flash point dan angka asam. Hasil penelitian menunjukkan bahwa hasil minyak destilat yang relatif baik dan yang masuk dalam spesifikasi standar dan mutu biodiesel diperoleh pada pada konsentrasi katalisator KOH 0,75 – 0,90 %b/v dan rasio minyak kelapa/etanol 3:1 – 5:1. Kata kunci: energi alternatif, biodiesel, transesterifikasi, rasio bahan, standar mutu The demand for energy in Indonesia has increased very fast in the recent years in the midst of fossil oil depletion. A lot of effort has been carried out to find alternative energies. One of the promising alternative energies is biodiesel. Indonesia, as the largest producer of vegetable oil in the world, has an opportunity to play a significant role as a biodiesel producer. Among various vegetable oils, coconut oil is a potential raw material in biodiesel production. The process was carried out in a three-neck round bottom flask equipped with motor stirrer and thermometer. The trans-esterification reaction was conducted by mixing heated coconut oil with a mixture of ethanol and KOH catalyst for two hours. The process variables studied in the present work were catalyst concentration and coconut oil – ethanol ratio. At the optimal condition when the KOH concentration in a range of 0.75-0.90% w/v and a coconut oil – ethanol ratio of 3:1 -5:1, the process produce biodiesel that meets the standard. Key words: alternative energy, biodiesel, trans-esterification, reactant ratio, quality assurance
Comparative Efficacy of Wet Wipe Preservatives: Antimicrobial Performance to Inhibit Microbial Growth Hakim, M. Arif Lukman; Adi Permadi; Erna Astuti; Farahidah Mohamed
Jurnal Biologi Tropis Vol. 25 No. 2 (2025): April-Juni
Publisher : Biology Education Study Program, Faculty of Teacher Training and Education, University of Mataram, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jbt.v25i2.9477

Abstract

The global market for wet wipes has seen significant growth in the past decade, establishing them as a popular product for personal care and household use. However, their high water and cellulose content makes them vulnerable to contamination by pathogenic microorganisms, which can cause changes in both their physical and chemical properties. This study aims to evaluate the efficacy of six preservative formulations in preventing microbial contamination in wet wipes. The formulas tested included: Formula 1 (F1) with phenoxyethanol and benzalkonium chloride; Formula 2 (F2) with phenoxyethanol, sodium benzoate, and potassium sorbate; Formula 3 (F3) with phenoxyethanol and caprylyl glycol; Formula 4 (F4) with polyaminopropyl biguanide and caprylyl glycol; Formula 5 (F5) with sodium benzoate, potassium sorbate, and cetylpyridinium chloride; and Formula 6 (F6) with propylene glycol and chlorphenesin. A 28-day challenge test was conducted using a multispecies inoculation technique, including bacteria, mould, and yeast. All formulas were initially sterile, as confirmed by sterility testing. The results showed that Formula F1 was the most effective, reducing microbial growth by over 6 log units within 14 days. Formulas F5 and F6 also demonstrated effectiveness, though microbial reduction in these formulas was slower, only reaching >6 log reduction by day 28. Formulas F2, F3, and F4 did not meet the required standards for mould and yeast reduction. These findings support the use of Formula F1 as the most reliable preservative combination, ensuring the safety and quality of wet wipes.
Effect of Sulfur Content in Wetar Pyrite Waste on the Formation Process of Sulfuric Acid Products at AIM Project Morowali Yulian Putra, Rizky Wira; Totok Eka Suharto; Erna Astuti
Journal of Chemical Process Engineering Vol. 10 No. 1 (2025): Journal of Chemical Process Engineering
Publisher : Fakultas Teknologi Industri - Universitas Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33096/jcpe.v10i1.1795

Abstract

Pyrite ore is a sulfide mineral commonly found in mining operations, and has the potential to be converted into valuable chemical products. The substantial quantity of high-quality pyrite ore waste generated by the Wetar Copper Mine is non-reusable, potentially causing environmental issues upon exposure to air.  To mitigate potential environmental contamination at the Wetar Copper Mine, the AIM Project was initiated to process high-quality pyrite ore waste into sulfuric acid. This study aims to determine the effect of sulfur content, measured as a percentage of sulfur recovery, on the conversion of SO2 gas to SO3. Concentrate and calcine samples with particle size variations of 100, 120, 160 and 200 mesh were analyzed on a Carbon Sulfur Analyzer (CSA) with combustion temperature variations of 1100, 1150, 1200 and 1250˚C to determine sulfur content as a reference for the potential amount of SO2 to SO3 conversion in sulfuric acid formation. The results showed that the conversion of SO₂ gas to SO₃ increased with increasing particle size, with a particle size of 200 mesh yielding an optimum sulfur gas conversion percentage of 4.12%. At the same conditions, a maximum sulfur recovery rate of 96.66% was obtained from an average particle size of 200 mesh.
Co-Authors Adi Permadi Farahidah Mohamed Hakim, M. Arif Lukman Nining Sugihartini Totok Eka Suharto Yulian Putra, Rizky Wira Zainab