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All Journal Jurnal Teknik Mesin Jurnal Dinamis Jurnal Teknologi Pangan dan Gizi Agrointek Rekayasa Mesin FLYWHEEL : Jurnal Teknik Mesin Untirta Teknika: Jurnal Sains dan Teknologi INOVTEK POLBENG Logista: Jurnal Ilmiah Pengabdian Kepada Masyarakat Jurnal Teknologi Hasil Pertanian Otopro JPIn : Jurnal Pendidik Indonesia Jurnal Mesin Nusantara Jurnal Pengabdian Masyarakat Indonesia Dinamis International Journal of Research in Vocational Studies (IJRVOCAS) Sinergi Polmed : Jurnal Ilmiah Teknik Mesin IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) INJECTION: Indonesian Journal of Vocational Mechanical Engineering Jember Medical Journal (JMJ) Jurnal Pengabdian Kepada Masyarakat dan Desa (PASSA) Jurnal Pengabdian Masyarakat (Jubdimas) DIGIMAS: Jurnal Transformasi Digital Masyarakat
Melvin Emil Simanjuntak -
Politeknik Negeri Medan
Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Immunology & microbiology Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Public Health Social Sciences Transportation Other

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Karakteristik Fisikokimia dan Antioksidan Minuman Herbal Bunga Telang pada Berbagai Proporsi Daun Rambusa dan Beluntas Widyawati, Paini Sri; Epriliati, Indah; Purwanto, Agus; Simanjuntak, Melvin Emil
Jurnal Agroteknologi Vol. 19 No. 2 (2025)
Publisher : Fakultas Teknologi Pertanian Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/jagt.v19i2.60016

Abstract

Pluchea herbal drink has less attractive color and sensory characteristics so that it needs the addition of other herbal ingredients to improve it, especially butterfly pea flowers. Using of butterfly pea flowers at 60% w/w proportion can increase panelist acceptance, but its antioxidant activity is reduced. Therefore, it is necessary to combine pluchea leaves with stinking passion flower leaves to increase its antioxidant activity. The stinking passion flower is a herbal plant that has the potential as an antioxidant because it contains flavonoids, alkaloids, steroids, triterpenoids, saponins, and tannins. The purpose of this study was to determine the physicochemical and antioxidant characteristics of butterfly pea herbal drink in various proportions of stinking passion flower-pluchea leaves. The results showed that increasing the proportion of stinking passion flower leaves did not change the intensity and blue color of the butterfly pea herbal drink, but the turbidity level decreased along with the increase in pH value and the decrease in total acid value. The addition of stinking passion flower leaves up to a proportion of 70% w/w was able to increase the total phenol content (TPC) and antioxidant activity (DPPH free radical scavenging activity and iron ion reducing power/ FRAP), but the total flavonoid content/TFC decreased along with the increase in the proportion of stinking passion flower leaves. The combination of stinking passion flower-pluchea leaves up to a proportion of 70:30 % w/w is the right proportion to increase the total phenol content and antioxidant activity of the butterfly pea flower herbal drink.Keywords: antioxidant, butterfly pea flower, herbal drink, pluchea leaf, stinking passion flower leaf
Fabrication and Experimental Evaluation of a Small-Scale Pyrolysis Reactor for Coconut Shell Charcoal Production Melvin Emil Simanjuntak; Jandri Fan H.T. Saragi; Muhammad Iqbal Murti; Prisca Caesa Moneteringtyas; Paini Sri Widyawati
DINAMIS Vol. 14 No. 1 (2026): Dinamis
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/dinamis.v14i1.24710

Abstract

The utilization of coconut shell biomass for small-scale charcoal production through pyrolysis offers a renewable energy alternative, yet the time-dependent evolution of charcoal properties during carbonization remains underexplored. This study aims to fabricate a small-scale fixed-bed pyrolysis reactor and experimentally evaluate the effect of pyrolysis time on coconut shell charcoal characteristics at a constant operating temperature of 400°C. The reactor was fabricated from carbon steel with an effective volume of 150.6 L. Pyrolysis experiments were conducted for 300 minutes, with charcoal samples collected at 30‑minute intervals. The results show that increasing pyrolysis time progressively reduced both charcoal yield and bulk density, with final values of 14.7 % and 6.67 kg/m³, respectively at 210 minutes, after which both stabilized. The carbonization process exhibited three distinct stages: early gradual devolatilization (30–120 min), rapid structural transformation (120–180 min), and stabilization (after 210 min). Visual observations revealed a transition from dark brown to deep black coloration with increasing residence time, followed by increased fragility at prolonged durations. The novelty of this work lies in the application systematic interval‑based sampling that reveals the dynamic evolution of charcoal properties as a function of residence time, rather than reporting only final product characteristics. These findings confirm that pyrolysis time is a key operational parameter and provide a practical basis for selecting optimal durations (120–180 min) to obtain structurally stable charcoal in small‑scale fixed‑bed reactors.
Analisis Kinerja Pengering Putar Bertenaga Surya untuk Pengeringan Jamur Tiram Menggunakan Dua Kolektor yang Ditutup dengan Plastik UV Melvin Emil Simanjuntak; Farhan Habib; Paini Sri Widyawati; Prisca Caesa Moneteringtyas; Agnes Br. Manurung
IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Vol 5 No 2 (2026): Agustus
Publisher : CV. IRA PUBLISHING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56862/irajtma.v5i2.454

Abstract

Oyster mushrooms have a high moisture content, making them highly susceptible to postharvest deterioration. Solar energy-based drying offers an alternative way to extend shelf life while reducing energy use and environmental impact. This study evaluated the performance of a solar-powered rotary dryer equipped with two UV-plastic-covered collectors for drying oyster mushrooms. The experiment ran over two days, for a total drying time of 16 hours. The observed parameters included collector temperature, solar radiation intensity, moisture content, drying rate, collector efficiency, and dryer efficiency. The results showed that the average collector temperature reached 42.7°C, while the overall average solar radiation intensity was 351.6 W/m². The average radiation intensities received by the right and left collectors were 392.2 and 311.1 W/m², respectively. Drum 1 achieved the lowest final moisture content (5.00%), while Drum 3 reached 5.20%. Collector and dryer efficiencies were 74.92% and 12.55%, respectively. The system shows potential as an effective, environmentally friendly technology for drying oyster mushrooms.
Co-Authors Agnes Br. Manurung AGUS PURWANTO Amelia Amelia Dian I Y Ribka Stefanie Wongso, Paini Sri Widyawati, Tarsisius D B Fenny A K, Evelyn L W, Dian I Y Edwin Manat Ezra Septhian Farhan Habib Ginting, Berta Br. Haloho, Ghabe Pratama Hendry H. Lumbantoruan Henry Toruan - Hutabarat, Udur Januari Hutajulu, Elferida I Made Kastiawan Robert Firmandus, I Made Kastiawan Ian Hardianto Indah Epriliati Ivan Christian Hernando Jandri Fan H.T. Saragi Janter P. Simanjuntak Jeremi Gideon Turnip Joseph Wicaksono Tandio Junaidi Junaidi Kristianus Boby A.M. Siahaan Kurniawaan Lay Lay, Kurniawaan Lumbantoruan, Henry Hasian Melvin Bismark Hamonangan Sitorus - Mhd Daud Pinem Muhammad Iqbal Murti Muhammad Robby Falito Naibaho, Penteris Rumissar P Nelson Manurung, Nelson Ninuk Jonoadji Paini Sri Widyati Pakpahan, Binsar Maruli Tua Prisca Caesa Moneteringtyas Roche Alimin Rohman, Adi Prasetya Saragi, Jandri Fan HT simanjuntak, benrad edwin Simanjuntak, Janter P Simanjuntak, Janter P. sinabutar, dohar Sitorus, M.B.H. Sormin, Syariful Hikmah Sutrisno Sutrisno Teng Sutrisno Teng Sutrisno Teng Sutrisno Teng Sutrisno Willyanto Anggono Willyanto Anggono Willyanto Anggono Yulianto, Adam Eko