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All Journal JBIO: jurnal biosains (the journal of biosciences) Jurnal Pendidikan dan Pembelajaran Kimia (JPPK) JURNAL PENGABDIAN KEPADA MASYARAKAT Jurnal Pendidikan Kimia (JPKim) JCRS (Journal of Community Research and Service) Jurnal Pembelajaran dan Biologi Nukleus Jurnal Inovasi Pendidikan dan Sains Indonesian Journal of Chemical Science and Technology Nautical: Jurnal Ilmiah Multidisiplin Indonesia Jurnal Pendidikan, Sains dan Teknologi HUMANITIS : Jurnal Humaniora, Sosial dan Bisnis Jurnal Pengabdian Masyarakat Indonesia (JPMI) Marga: Journal Of Innovation and Creatifity
Rudi Munzirwan Siregar, Rudi Munzirwan
Departement Of Chemistry, Faculty Of Mathematics And Natural Sciences, Universitas Negeri Medan, Jl. Willem Iskandar Pasar V Medan Estate, Medan 20221, Indonesia
Religion Agriculture, Biological Sciences & Forestry Arts Humanities Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Education Energy Engineering Environmental Science Immunology & microbiology Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Medicine & Pharmacology Physics Public Health Social Sciences Other

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PERBAIKAN MUTU AROMA DAN CITA RASA KOPI DENGAN MENGGUNAKAN PROSES FERMENTASI PADA USAHA PUCAKO ROASTERY DI KELURAHAN AMPLAS, KECAMATAN MEDAN AMPLAS, KOTA MEDAN Yusuf, Muhammad; Siregar, Rudi Munzirwan; Daulay, Rabiah Afifah; Mukra, Rizal; Andayani, Widya
Journal of Community Research and Service Vol. 8 No. 2: July 2024
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/jcrs.v8i2.62221

Abstract

Program pengabdian kemitraan masyarakat (PKM) ini bertujuan untuk melakukan pendampingan kepada mitra dengan memanfaatkan buah nanas sebagai bahan fermentasi untuk memperbaiki mutu aroma dan cita rasa kopi. Hal ini dilakukan berdasarkan hasil observasi awal yang dilakukan oleh tim pengusul yaitu : 1) Proses pengeringan kopi yang tidak seragam, dan 2) Mutu aroma dan cita rasa yang masih kurang bagus. Penyebabnya karena bahan kopi robusta yang dibeli ke petani memiliki tingkat mutu yang berbeda. Dampaknya, harga kopi menjadi rendah. Mitra PKM ini adalah Usaha Pucako Roastery di Kelurahan Amplas, Kota Medan. Metode pelaksanaan PKM ini dilakukan melalui dua tahapan utama yaitu: 1) Pembuatan bubur buah nanas, dan 2) Fermentase kopi menggunakan bubur nanas. Melalui PKM ini diharapkan terjadi perbaikan mutu aroma dan cita rasa kopi serta dapat meningkatkan penjualan mitra. Adanya enzim bromelin pada bubur nanas akan dapat menurunkan kadar kafein karena enzim ini mampu memecahkan senyawa yang mirip protein pada kopi.
Antioxidant Activity Test of Barangan Banana Peel (Musa Acuminata Linn) Etanol Extract With DPPH Method Arista, Nurul; Siregar, Rudi Munzirwan
Indonesian Journal of Chemical Science and Technology (IJCST) Vol. 6 No. 2 (2023): JULY 2023
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v6i2.49373

Abstract

Barangan banana (Musa acuminata linn) is also called Medan banana which is often found in North Sumatra. Banana peels are known to contain phenolic compounds that have potential as antioxidants. This study aims to determine the antioxidant activity of raw and ripe banana peel extract of Barangan banana (Musa acuminata linn) using the DPPH (1,1-diphenyl-2-pikrihidrazil) method. The data obtained was calculated to determine the antioxidant activity. The results showed that the antioxidant activity of the ethanol extract of Barangan raw banana peel IC50 = 32,52 μg/mL, the ethanol extract of Barangan ripe banana peel IC50 = 83,60 μg/mL, and the vitamin C comparator obtained an IC50 value of 5,00. Raw banana peel extract has higher antioxidant activity than ripe banana peel extract.
Application of the Contextual Teaching and Learning Model Using Animated Power Point Media on Student Motivation and Learning Outcomes in Class XI High School Reaction Rate Material Putri Jasrina; Rudi Munzirwan Siregar
Marga: Journal Of Innovation and Creatifity Vol 1 No 1 (2024): Marga: Journal of Innovation and Creativity
Publisher : Sekolah Tinggi Olahraga dan Kesehatan Bina Guna

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Abstract

This research aims to test whether there is a difference in the learning outcomes of students who use the Contextual Teaching And Learning Model with the Doratoon Animation Powerpoint with the learning outcomes of students who use the Contextual Teaching And Learning Model with the Powtoon Animation Powerpoint on the Reaction Rate learning material, and to assess whether learning motivation students who use the Contextual Teaching And Learning Model with Doratoon Animation power points compared to the learning motivation of students who use the Contextual Teaching And Learning Model with Powtoon Animation power points on Reaction Rate learning materials and aims to find out whether there is interaction between models and media on students' final motivation in determining student learning outcomes in reaction rate learning material in class XI Science at SMA Negeri 1 Binjai - Langkat. The samples used were two classes selected by random sampling and classes XI IPA 1 and XI IPA 3 were selected. Hypothesis testing was carried out in two ways, namely the paired t test and the one way anova test. In the hypothesis test, the value of learning outcomes obtained a sig value of 0.001 < α= 0.05 so that H0 was rejected and Ha was accepted, so it was proven that learning outcomes were higher in classes that used the contextual teaching and learning model with Doratoon animated power point media. In terms of motivation, a significance value of 0.049 is produced, which is smaller than α= 0.05, so Ha is accepted and H0 is rejected, which shows that learning motivation is higher in classes taught using the contextual teaching and learning model with Doratoon animated power point media. In the interaction test, a sig.nificance value of 0.004 was obtained, which indicates a value < of α= 0.05 so that Ha is accepted and H0 is rejected, so there is an interaction between the model and the media on students' final motivation in the reaction rate material.
PERBANDINGAN ASAM ASETAT DENGAN ASAM FORMIAT SEBAGAI BAHAN PENGGUMPAL LATEKS Rudi Munzirwan Siregar; Putri Anggita Widodo
Jurnal Inovasi Pendidikan dan Sains Vol 2 No 3 (2021): December
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Nahdlatul Wathan Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51673/jips.v2i3.774

Abstract

Indonesia is one of the largest rubber producers. Almost all garden latex for rubber production must be coagulated before further processing. Research has been carried out on the comparison of acetic acid with formic acid as a latex coagulation agent. This study aims to compare acetic acid with formic acid as a latex coagulation agent. Coconut shell charcoal (particle size 80 mesh) was added to the latex with a weight of 42 grams then the latex was coagulated with acetic acid and formic acid with a pH of 4.7. As a rubber quality research was carried out by measuring the initial plasticity, plasticity retention index and mooney viscosity of rubber. In conclusion, latex coagulated with acetic acid produced better rubber than latex coagulated with formic acid.
Co-Authors Ahmad Nasir Pulungan Arista, Nurul Artika, Refi Dewi Syafriani Muhammad Yusuf Muhammad Yusuf Pedro Shane M Simbolon Putri anggita widodo Putri Anggita Widodo Putri Jasrina Rabiah Afifah Daulay Ratna Sari Dewi Rizal Mukra Sabani Widya Andayani WIDYA ANDAYANI