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All Journal EKSAKTA: Journal of Sciences and Data Analysis Indonesian Journal of Chemistry Jambura Journal of Chemistry Fullerene Journal of Chemistry Oxygenius Journal Of Chemistry Education JIPI (Jurnal IPA dan Pembelajaran IPA)
Emma Julin Pongoh
Universitas Negeri Manado
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Earth & Planetary Sciences Education Environmental Science Materials Science & Nanotechnology Physics

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Reaksi Pembentukan 17α(chlorovinyl-3-methyl-butene)estradiol Melalui Reaksi Adisi Alkuna Terminal Pada Etinilestradiol Dengan Katalis ZnCl2: Reaksi adisi alkuna terminal pada 17α-ethinylestradiol dengan Katalis ZnCl2 dan HCl dengan media diklorometana Omega Siwu; Rymond J. Rumampuk; Budi Oktavia; Emma J. Pongoh; Soenandar M.T Tengker; Vlagia I Paat
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 4, ISSUE 2, August 2023
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/EKSAKTA.vol4.iss2.art1

Abstract

The addition reaction had been done on the terminal alkynes of 17α-ethynylestradiol with ZnCl2 and HCl catalyst mediated by dichloromethane. The reaction conditions were carried out at a temperature of 70°C for 29 h, the separation of the reaction properties was carried out using Gravity Column Chromatography, and the reaction products were identification using by Nuclear Magnetic Resonance (NMR). The catalyst used was a cationic ligand coordinate, where Zn acts as the central ion and 2-propanol as the ligand. In the reaction mechanism, the reaction begins with the formation of dimeric ether. ZnCl3 catalyst acts as Lewis acid which converts alcohol to dimeric ether and forms a complex with ZnCl3. The nucleophilic terminal alkyne then attacks the C-O bond of the ether to form a vinyl carbocation which then attracts a chlorine atom from ZnCl3 which was complex bound with ether, resulting in a reaction product of 17α(chlorovinyl-3-methyl-butene)estradiol
Studi Senyawa Metabolit Sekunder Dari Fraksi Etil Asetat Daun Pare Hutan (Momordica balsamina L.) claudia christy senduk; Rymond Rumampuk; Ardi Kapahang; Emma Pongoh
Jurnal Kimia Fullerene Vol 8 No 2 (2023): Fullerene Journal of Chemistry
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37033/fjc.v8i2.562

Abstract

Daun pare hutan (Momordica balsamina L) merupakan tanaman asli wilayah yang beriklim tropis yang tumbuh liar dan dimanfaatkan oleh masyarakat sebagai obat herbal. Penelitian ini dilakukan untuk mempelajari, senyawa metabolit sekunder yang terkandung dalam fraksi etil asetat daun pare hutan (momordica balsamina L.), dengan cara di isolasi dan di identifikasi. Proses isolasi dilakukan menggunakan metode maserasi, untuk pemisahan dan pemurnian senyawa menggunakan metode Kromatografi Lapis Tipis (KLT) dan Kromatografi Kolom Gravitasi sehingga diperoleh isolat (F1.6.1) dengan berat sampel 1,4 mg. Identifikasi senyawa mengunakan Nuclear Magnetic Resonance Proton (1H-NMR) dan Nuclear Magnetic Resonance Carbon (13C-NMR). Hasil identifikasi isolat ditentukan sebagai suatu senyawa carbinol dengan usulan nama struktur 2,2,3,3-tetramethylcyclohexane-1,1-diol dengan rumus molekul C10H18O2.
Penerapan Model Pembelajaran Problem Based Learning (PBL) dengan Pendekatan Etnosains Pada Materi Larutan Penyangga di SMA Negeri 1 Tahuna Dewi Indriyany Manangkoda; Emma Julin Pongoh; Rymond Jusuf Rumampuk
Oxygenius: Journal Of Chemistry Education Vol 5 No 2 (2023): Oxygenius : Journal Of Chemistry Education
Publisher : Chemistry Department, Universitas Negeri Manado

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37033/ojce.v5i2.594

Abstract

Penelitian ini merupakan penelitian tindakan kelas yang bertujuan untuk meningkatkan hasil belajar siswa pada materi larutan penyangga melalui penerapan model pembelajaran problem based learning (PBL) dengan pendekatan etnosains. Terdapat beberapa hal yang mendasari penelitian ini adalah rendahnya minat belajar siswa pada mata pelajaran kimia yang kemudian membuat hasil belajar siswa kurang memuaskan. Penelitian yang dilakukan merupakan penelitian tindakan kelas (PTK) yang berlangsung dalam dua siklus, pada siklus I dilaksanakan tiga kali pertemuan dan disiklus II dilaksnakan dua kali pertemuan. Masing-masing siklus pada penelitian ini terdiri dari: tahap perencanaan, pelaksanaan, observasi, dan refleksi. Teknik pengumpulan data dilakukan dengan menggunakan lembar observasi dan tes tertulis. Berdasarkan hasil penelitian yang diperoleh bahwa model pembelajaran PBL dengan pendekatan etnosains dapat meningkatkan hasil belajar siswa. Hal tersebut dapat dilihat dari presentase hasil belajar siswa yang meningkat dari 74% pada siklus I yang selanjutnya meningkat menjadi 96% pada siklus II.
Isolation and Identificationof Octadecane-3-on Compound From Ethyl Acetate Fraction of Momordica balsamina L. Leaves Emma Julien Pongoh*; Rymond Jusuf Rumampuk; Vlagia Indira Paat; Stefan Marco Rumengan; Julieta Soputan
JIPI (Jurnal IPA dan Pembelajaran IPA) Vol 8, No 1 (2024): March 2024
Publisher : Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jipi.v8i1.37717

Abstract

Momordica balsamina L. is a wild plant that generally grows in moist soil and gets a lot of sunlight. The leaves and fruit are reported to have various medicinal and nutritional properties.  This study aimed to isolate and identify the compounds contained in the ethyl acetate fraction in Momordica balsamina L The isolation stage was carried out by the maceration method and the separation and purification of the compounds using gravity column chromatography methods to obtain isolate fraction F1.6.2 with a sample weight of 2.4 mg. Identification of compounds using proton nuclear magnetic resonance (1H-NMR) and carbon nuclear magnetic resonance (13C-NMR) spectroscopy techniques. The proposed identified compound is octadecan-3-one or 3-octadecanone with the molecular formula C18H36O
Quantitative Determination of Ascorbic Acid Content in Two Varieties of Bird’s Eye Chili (Capsicum frutescens L.) using UV-Vis Spectrophotometry Howan, Dian; Saiya, Abdon; Pongoh, Emma
Jurnal Kimia Fullerene Vol 10 No 2 (2025): Fullerene Journal Of Chemistry
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37033/fjc.v10i2.745

Abstract

This study quantified and compared the ascorbic acid content in green and red bird's eye chili (Capsicum frutescens) using UV-Vis spectrophotometry. The method was optimized by determining the maximum wavelength of ascorbic acid in an acid-stabilized solution, found to be 231 nm. A calibration curve was constructed with standard solutions (25-100 ppm), yielding a linear equation y = 0.0514x + 0.6032 (R² = 0.9361). Sample extracts were prepared and analysed in triplicate at this wavelength. The results demonstrated a significant difference in ascorbic acid concentration between the two varieties. The red chili exhibited a higher concentration of 34.39 ppm in the measured solution, corresponding to 0.90% (b/b) of the fresh weight. In contrast, the green chili contained 23.95 ppm (0.60% b/b). This indicates a 50% higher ascorbic acid content in the mature red fruit. The study concludes that ripening significantly enhances the vitamin C content in bird's eye chili, and the red variety is a nutritionally superior source. The validated method proved effective for the quantitative analysis of ascorbic acid in complex food matrices.
PENERAPAN PEMBELAJARAN KIMIA BERBASIS CHEMO-ENTREPRENEURSHIP PADA MATERI LARUTAN PENYANGGA KELAS XI SISWA SMA CITRA KASIH MANADO Runtuwene, Christiana Paula; Rumampuk, Rymond; Tengker, Soenandar; Kaeng, Meilanie; Pongoh, Emma
Oxygenius: Journal Of Chemistry Education Vol 7 No 1 (2025): Oxygenius : Journal Of Chemistry Education
Publisher : Chemistry Department, Universitas Negeri Manado

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37033/ojce.v7i1.722

Abstract

This study aims to determine the effect of applying Chemo-Entrepreneurship (CEP)-based chemistry learning on students' engagement and learning outcomes in the buffer solution material for Grade XI students at SMA Citra Kasih Manado. This research employed a Classroom Action Research (CAR) method conducted in two cycles, each consisting of planning, implementation, observation, and reflection stages. The research instruments included student activity observation sheets and learning outcome tests. The results showed that the application of CEP-based learning significantly increased students' engagement and learning outcomes. The average learning activity score increased from 42.5% (categorized as low) in the first cycle to 90% (categorized as very good) in the second cycle. The average learning outcome score also rose from 56 in the first cycle to 89 in the second cycle, achieving a 100% mastery level. The implementation of Chemo-Entrepreneurship through a research-based learning model proved effective in enhancing student engagement, creativity, and understanding of buffer solution concepts. Therefore, this approach is recommended for use in other chemistry learning topics to foster entrepreneurial potential and 21st-century skills among students.
Co-Authors Abdon Saiya Anthony J Herlt Ardi Kapahang Arfiani Rizki Paramata Astin Lukum Budi Oktavia Chrisly Durant claudia christy senduk Dewi Indriyany Manangkoda Dewi Yul Launde Dian H O Howan Dian Howan Gabriel Reinhard Kahiking Hutri C. Werfete Jeanne M. Tuerah Joice Dorsila Susana Caroles Julieta Soputan Kaeng, Meilanie Lewis N Mander Oktaviani Rampi Omega Siwu Paat, Vlagia Indira Ponis Tarigan Ponis Tarigan Runtuwene, Christiana Paula Rymond J. Rumampuk Rymond Jusuf Rumampuk Sofia Satriani Krisen Sonny Lumingkewas Stefan Marco Rumengan Tengker, Soenandar Millian Tompunu Theresia N. R. Boce Veyta Tamunu