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All Journal Jurnal Fisika Unand Jurnal IPTEK Konversi Jurnal Pengbdian Teknik Mesin
Rachmad Ramadhan Yogaswara
Universitas Pembangunan Nasional "Veteran" Jawa Timur
Humanities Civil Engineering, Building, Construction & Architecture Computer Science & IT Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics

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Aplikasi Metode Microwave Hydrodistillation pada Ekstraksi Minyak Atsiri dari Bunga Kamboja (Plumeria alba) Nove Kartika Erliyanti; Erwan Adi Saputro; Rachmad Ramadhan Yogaswara; Elsa Rosyidah
Jurnal IPTEK Vol 24, No 1 (2020)
Publisher : LPPM Institut Teknologi Adhi Tama Surabaya (ITATS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.iptek.2020.v24i1.865

Abstract

The aim of this study is to determine the effect of microwave power and solvent volume to the density of Frangipani essential oil, and to determine the yield effect of mass of raw material on Frangipani essential oil. Frangipani flowers that have been cut in the size of ± 2 cm are extracted in the microwave with a mass of 25 gr and 50 gr, volume of solvents is 300, 400, 500, and 600 ml. The extraction process uses microwave power of 300, 450, and 600 watt and the extraction time is three hours. The results showed that the effect of microwave power and the volume of solvent had a significant effect on the density of Frangipani flower essential oils. The result showed that the density is increase when the microwave power and the volume of solvent increase. The highest density is produced at 600-watt microwave power, 600 ml solvent volume, and 50 gram of Frangipani flower mass that is equal to 0.904 gram/ml. Yield decreases with increasing mass of raw material used. The highest yield was produced at 600-watt microwave power, 600 ml solvent volume, and 25-gram Frangipani mass, which is equal to 1.612%.C
TRANSESTERIFICATION OF BIODIESEL FROM KAPOK SEED OIL (Ceiba pentandra) Nove Kartika Erliyanti; Afida Kartika Sari; Achmad Chumaidi; Rachmad Ramadhan Yogaswara; Erwan Adi Saputro
Konversi Vol 10, No 2 (2021): Oktober 2021
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/k.v10i2.11247

Abstract

The purpose of this study was to determine the effect of KOH concentration and reaction time on the flash point and pour point of biodiesel from kapok seed oil. The biodiesel transesterification process is carried out in a batch reactor equipped with stirrer. The first step in this research is to reduce the free fatty acid content (esterification process). The second step is transesterification of biodiesel from kapok seed oil. The concentrations of KOH used in this research were 0.5, 1.0, 1.5, and 2.0% by weight of the oil and the reaction time were 0.25, 0.5, 1.0, and 1.5 hours. The operating conditions used in this study were a temperature of 60 oC and a pressure of 4 bar. The results showed that the concentration of KOH and reaction time had a significant effect on the flash point and pour point of biodiesel. The best flash point and pour point were obtained at a concentration of 0.5% KOH and a reaction time of 1.5 hours, which were 163 oC and -8 oC.
Pelatihan Berbicara Bahasa Inggris secara Online “Daily Activities” dengan Zoom Meeting Erwan Adi Saputro; Rachmad Ramadhan Yogaswara; Nove Kartika Erliyanti; Mu’Tasim Billah
abdimesin Vol. 1 No. 1 (2021): AbdiMesin
Publisher : abdimesin

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Abstract

Pandemi covid-19 memberi dampak pada berbagai macam aspek kehidupan. Salah satunya pada aspek pendidikan, pemerintah menetapkan kebijakan School From Home (SFH) atau sekolah dari rumah sehingga kegiatan pembelajaran dilaksanakan menggunakan media online. Kegiatan ini diadakan untuk meningkatkan semangat belajar berbahasa inggris di masa pandemi, menggunakan media Zoom yang dikhususkan pada kegiatan sehari-hari (daily activities). Pelatihan ini diikuti oleh anak SD dari berbagai macam sekolah. Kegiatan ini berhasil membuat peserta kegiatan mampu menyampaikan kegiatan sehari-hari dalam bahasa inggris dengan baik dan benar.
Potensi Ekstrak Kulit Buah Naga Merah (Hylocereus polyrhizus) sebagai Bioreduktor Untuk Biosintesis Nanopartikel Hawa Aritma Sunarko Putri; Rahmi Oktarini; Sri Redjeki; Rachmad Ramadhan Yogaswara
Jurnal Fisika Unand Vol 13, No 4 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.4.497-503.2024

Abstract

Salah satu jenis antioksidan yang biasanya terdapat pada tanaman seperti buah, kulit, daun, dan lain-lain adalah flavonoid. Selain itu, flavonoid dapat digunakan untuk pembentukan nanopartikel (NPs) sebagai bioreduktor. Tujuan dari penelitian ini adalah untuk mengkaji pemanfaatan ekstrak kulit buah naga merah sebagai bioreduktor pada sintesis nanopartikel seng oksida dari prekursor seng nitrat. Kulit buah naga merah dimaserasi untuk mendapatkan flavonoid. Seng nitrat digunakan sebagai prekursor untuk membuat ZnO NP. Senyawa flavonoid dalam ekstrak kulit buah naga merah dianalisis dengan menggunakan Spektrofotometri UV-Vis dan karakteristik nanopartikel seng oksida yang dihasilkan dianalisis menggunakan uji SEM-EDX. Flavonoid total yang terkandung dalam ekstrak adalah sebesar 5,6 x 10-4 mg QE/g. Nanopartikel ZnO yang terbentuk memiliki ukuran sebesar 157-174 nm dan mengandung komposisi penyusun yang terdiri dari 69,41% seng dan 29,35% oksigen.
Co-Authors Achmad Chumaidi, Achmad Afida Kartika Sari Elsa Rosyidah Erliyanti, Nove Kartika Erwan Adi Saputro Hawa Aritma Sunarko Putri Mu’Tasim Billah Rahmi Oktarini Sri Redjeki