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All Journal Jurnal MIPA IPTEK Journal of Proceedings Series PENA SAINS Indonesian Journal of Pure and Applied Chemistry Jurnal Review Pendidikan dan Pengajaran (JRPP) Jurnal Inovasi Pendidikan dan Sains Sciening : Science Learning Journal Bhakti Nagori (Jurnal Pengabdian kepada Masyarakat)
Chaleb Paul Maanari
Universitas Negeri Manado
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Economics, Econometrics & Finance Education Environmental Science Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Physics Social Sciences Other

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Aktivitas Penangkal Radikal Hidroksil Fraksi Flavonoid dari Limbah Tongkol Jagung pada Tikus Wistar Maanari, Chaleb P.; Suryanto, Edi; Pontoh, Julius
Jurnal MIPA Vol 3, No 2 (2014)
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/jm.3.2.2014.5990

Abstract

Penelitian telah dilakukan untuk menentukan kemampuan menangkal radikal hidroksil pada homogenat hati, jantung dan otak tikus wistar dari fraksi flavonoid limbah tongkol jagung. Penelitian dimulai dengan mengekstraksi serbuk tongkol jagung yang sudah dikering anginkan menggunakan cara refluks selama dua jam dengan pelarut etanol 80%. Ekstrak kemudian dipartisi berturut-turut menggunakan petroleum eter, etil asetat, n-butanol dan air, selanjutnya ditentukan kandungan total flavonoid serta aktivitas penangkal radikal hidroksil pada homogenat jaringan hati, jantung dan otak tikus wistar. Hasilnya menunjukkan ekstrak etil asetat yang memiliki kandungan total flavonoid yang paling tinggi yaitu 41,926 mg/kg ekstrak, serta kemampuan menangkal radikal hidroksil pada homogenat jaringan hati, jantung dan otak tikus wistar sebesar 90,964%; 86,875% dan 68,235%.This research has been conducted to determine radical hydroxyl scavenging ability on a wistar rat tissue homogenate of liver, heart and brain from corn cob waste extract. Research started with with extracting the powder of corn cob which had been air-dried using reflux method during two hours with 80% ethanol solvent. Then the extract successively partitioned with petroleum ether, ethyl acetate, n-buthanol and water, next determined the flavonoid total content with activities of hydroxyl radical on a wistar rat tissue homogenate. The result showed ethyl acetate extract which has good result for flavonoid total content that is 41,926 mg/kg extract, with ability of free radical scavenger on a rat tissue homogenate of liver, heart and brain as much as 90,964%; 86,875% and 68,235%.
Pemisahan dan Karakterisasi Etanol dari Nira Aren (Arenga pinnata) (Separation and Characterization of Ethanol from Palm Sap (Arenga pinnata)) Sanusi Gugule; Feti Fatimah; Chaleb P. Maanari
IPTEK Journal of Proceedings Series No 4 (2019): Seminar Nasional Kimia (SENAKI) XV 2019
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (747.969 KB) | DOI: 10.12962/j23546026.y2019i4.6109

Abstract

Telah dilakukan penelitian tentang pemisahan dan karakterisasi etanol dari nira aren (Arenga pinnata). Pemisahan dan analisis dilakukan dengan teknik distilasi secara bertahap, dilanjutkan dengan penentuan sifat-sifat fisik; sedangkan identifikasi struktur dilakukan secara spektrofotometer inframerah, kromatografi gas-spektrometer massa, spektrometer RMI1H. Hasil identifikasi struktur dengan spektrofotometer inframerah menunjukkan adanya gugus fungsi hidroksil (-OH) dan alkil (-C2H5), sedangkan hasil identifikasi dengan spectrometer RMI1H menunjukkan 3 karakteristik puncak hydrogen yakni H pada gugus hidroksil (–OH), metilen (-CH2-) dan metil (-CH3). Selanjutnya, hasil uji kromatografi gas-spektrometer massa menunjukkan 1 puncak dengan kadar etanol nira aren mencapai 100% serta fragmentasinya mengikuti pola struktur etanol (C2H5OH).
EFFECT OF POTASSIUM HYDROXIDE CONCENTRATION AS A CATALYST ON THE YIELD OF COCONUT OIL (Cocos nucifera) TRANSESTERIFICATION Chaleb Paul Maanari; Sanusi Gugule; Feti Fatimah; Aisyiah Restutiningsih Putri Utami; Mustapa Mustapa; Stefan Marco Rumengan; Miftahul Jannah; Jakub Saddam Akbar; Djois Sugiaty Rintjap
Indonesian Journal of Pure and Applied Chemistry Vol 6, No 3 (2023)
Publisher : Tanjungpura University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/indonesian.v6i3.65513

Abstract

Research has been carried out on the effect of potassium hydroxide catalyst concentration on the yield of coconut oil (Cocos nucifera) transesterification and continued to characterize the reaction results. The concentration of potassium hydroxide used was 1, 2, and 3% by weight of coconut oil with ethanol as the reactant. The data processing used was the one-way analysis of variation and its characterization from a physicochemical perspective, followed by the analysis of gas chromatography-mass spectroscopy (GCSM) and infrared spectrophotometry. Based on the data processing results, potassium hydroxide concentrations of 1, 2, and 3% did not affect the yield of the transesterification reaction of coconut oil, and the results were 74.5264%, 71.9330%, and 69.0420%. The characterization results show that the physicochemical properties of the reaction products, such as acid number, density, and viscosity, comply with the Indonesian National Standard (SNI) for biodiesel. The results of the GCMS analysis showed that nine peaks were dominated by ethyl laurate.
VIRTUAL LABORATORIES FOR SCIENCE LEARNING IN THE DIGITAL ERA Mustapa Mustapa; Wilce Anna Cahya Kuendo; Aisyiah Restutiningsih Putri Utami; Miftahul Jannah; Chaleb Paul Maanari
Jurnal Review Pendidikan dan Pengajaran (JRPP) Vol. 6 No. 4 (2023): Volume 6 No 4 Tahun 2023
Publisher : LPPM Universitas Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/jrpp.v6i4.20815

Abstract

Di era digital yang ditandai dengan kemajuan teknologi informasi, pemanfaatan laboratorium virtual menjadi penting dalam meningkatkan kualitas pendidikan sains. Dalam konteks digital ini, laboratorium virtual mempunyai kemampuan untuk menggantikan peran laboratorium nyata dalam menguji teori, hukum, dan konsep ilmiah. Penelitian ini mengeksplorasi berbagai platform laboratorium virtual yang dapat diterapkan pada pendidikan sains. PhET, Chemcollective, dan OLabs adalah platform yang dianalisis dalam artikel ini. Setiap platform memiliki kekuatan dan keterbatasannya masing-masing. Informasi yang diberikan diharapkan dapat menjadi panduan bagi guru dalam memilih platform laboratorium virtual yang selaras dengan tujuan pendidikan sains yang dimaksudkan.
THE INFLUENCE OF HEAVY METALS ON THE ABSORPTION OF CATIONIC DYES Mustapa Mustapa; Aisyiah Restutiningsih Putri Utami; Chaleb Paul Maanari; Miftahul Jannah; Stefan Marco Rumengan
JURNAL PENA SAINS Vol 11, No 1 (2024): Jurnal Pena Sains
Publisher : Program Studi Pendidikan IPA, Fakultas Ilmu Pendidikan, Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/jps.v11i1.24999

Abstract

Cationic dyes are dyes containing amine derivatives that can be used on cellulose, protein, nylon, acrylic and synthetic fibers but these dyes are less fast in coloring. This study investigates the impact of Pb2+ heavy metal ions on cationic dye absorption utilizing molecularly imprinted polymers as adsorbents. Concentrations of Pb2+ ranging from 0 to 50 mg/L were examined. In a one-hour interaction, 50 mg of adsorbent was introduced into a solution containing 100 ppm methylene blue dye and Pb2+ with varying concentrations. Following centrifugation, the filtrate was collected, and dye concentration was measured using a visible light spectrophotometer. The sorption capacity of the dye with Pb2+ reached 41.22 mg/g at the highest concentration and 35.83 mg/g at the lowest. Notably, an inverse relationship was observed between Pb2+ concentration and absorption capacity, indicating a decrease as metal ion concentration increased, though stability was maintained. These findings contribute valuable insights into the nuanced dynamics of heavy metal ions and cationic dye absorption, shedding light on potential applications of molecularly imprinted polymers as effective adsorbents.
Peningkatan Hasil Belajar Stokiometri pada Kuliah Kimia Dasar Menggunakan Pendekatan Flipped Classroom Stefan Marco Rumengan; Chaleb Paul Maanari; Aisyiah Restutiningsih Putri Utami; Mustapa Mustapa; Miftahul Jannah; Vlagia Indira Paat; Varisky Abraham Dumanauw; Jeanne Maria Tuerah; Marlina Karundeng; Yana Sambeka
SCIENING : Science Learning Journal Vol. 5 No. 1: Juni 2024
Publisher : Jurusan Pendidikan IPA FMIPA Universitas Negeri Manado

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Flipped classroom merupakan pendekatan pembelajaran di mana isi materi dan keterampilan yang biasanya diajarkan selama sesi kelas disampaikan di luar kelas. Penelitian ini bertujuan untuk mengevaluasi peningkatan hasil belajar mahasiswa dengan menggunakan model pembelajaran flipped classroom pada materi stokiometri dalam kuliah kimia dasar. Metode penelitian yang digunakan adalah penelitian kuantitatif dengan metode eksperimen dan desain one-group pretest-posttest. Sampel penelitian terdiri dari 35 mahasiswa kelas A di program studi pendidikan matematika Universitas Negeri Manado (Unima). Data dikumpulkan melalui tes hasil belajar dengan memberikan pretest sebelum proses perkuliahan dan posttest setelah proses perkuliahan dilaksanakan. Hasil penelitian menunjukkan bahwa rata-rata hasil belajar mahasiswa pada pretest adalah 49,33, sedangkan pada posttest meningkat menjadi 87,33. Pengujian N-Gain score menunjukkan skor sebesar 77%, yang masuk dalam kategori efektif dan tinggi. Berdasarkan temuan tersebut, dapat disimpulkan bahwa penerapan model flipped classroom secara efektif dan signifikan meningkatkan hasil belajar mahasiswa pada materi stokiometri dalam kuliah kimia dasar di program studi pendidikan matematika Unima.
PELATIHAN PEMBUATAN APLIKASI BERBASIS ANDROID TERINTEGRASI MODEL PEMBELAJARAN BERBASIS INKUIRI PADA GURU DI SMAN 1 MANADO Desire Atna Sridanty Rumondor; Jakub Saddam akbar; Dian Herlinda Octorina Howan; Chaleb Paul Maanari; Djakariah Djakariah
BHAKTI NAGORI (Jurnal Pengabdian kepada Masyarakat) Vol. 4 No. 2 (2024): BHAKTI NAGORI (Jurnal Pengabdian kepada Masyarakat) Desember 2024
Publisher : LPPM UNIKS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36378/bhakti_nagori.v4i2.3905

Abstract

Pelatihan pembuatan aplikasi berbasis Android yang terintegrasi dengan model pembelajaran berbasis inkuiri di SMAN 1 Manado merupakan upaya untuk meningkatkan kompetensi guru dalam memanfaatkan teknologi untuk mendukung pembelajaran abad ke 21. Pelatihan ini mencakup pengenalan teori pengembangan aplikasi Android, prinsip-prinsip pembelajaran berbasis inkuiri, serta strategi integrasi keduanya dalam pembelajaran. Hasil pelatihan menunjukkan bahwa peserta, yaitu guru-guru di SMAN 1 Manado, mampu memahami teori dan merancang aplikasi sederhana yang relevan dengan kebutuhan pembelajaran. Integrasi antara teknologi Android dan model pembelajaran berbasis inkuiri terbukti efektif dalam meningkatkan kualitas pembelajaran, menciptakan pengalaman belajar yang interaktif, menarik, dan bermakna. Refleksi peserta mengungkapkan apresiasi terhadap pelatihan ini, yang dinilai memberikan wawasan baru serta keterampilan yang aplikatif. Dengan pendampingan berkelanjutan, pelatihan ini diharapkan menjadi langkah awal dalam mendorong inovasi pembelajaran berbasis teknologi di sekolah, sekaligus menjadi model bagi pengembangan pendidikan di era digital.
Development of Basic Chemistry Lab Work Module as Science Process Skills Assessment Aisyiah Restutiningsih Putri Utami; Mustapa Mustapa; Chaleb Paul Maanari; Stefan Marco Rumengan; Jakub Saddam Akbar; Musma Rukmana
Jurnal Inovasi Pendidikan dan Sains Vol 6 No 1 (2025): April
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.v6i1.2434

Abstract

In this research, a lab work module daily life base has been successfully developed in the basic chemistry 1 lab work. This module was created to make practicum implementation easier in the chemistry laboratory due to limited tools and materials. This research aims to assess students' science process skills. The lab work module development process uses the ADDIE model research approach. After that, the validation tests carried out were media experts and material experts, each consisting of two experts, and average validation test scores for material and media experts were found to be 4.67 and 4.54, respectively. These results indicate that the module is suitable for use as a learning resource. The next step was to test its practicality and effectiveness using pretest and posttest instruments, students' score results, and questionnaires. Data analysis was carried out using descriptive statistical methods and the results obtained were that the module was suitable and practical for use as a learning resource with a practicality percentage of 89.47%. Furthermore, the student's learning completion results were 100% and the N-Gain value was 0.71, which proves that the module created is effective. In conclusion, the product that has been developed is successful in improving students' science process skills.
Co-Authors Aisyiah Restutiningsih Putri Utami Desire Atna Sridanty Rumondor Dian H O Howan Djakariah, Djakariah Djois Sugiaty Rintjap Edi Suryanto Fachry Abda El Rahman Feti Fatimah Jakub Saddam Akbar Jeanne M. Tuerah Julius Pontoh Marlina Karundeng Miftahul Jannah Musma Rukmana Mustapa Mustapa Paat, Vlagia Indira Sanusi Gugule Stefan Marco Rumengan Varisky Abraham Dumanaw Wilce Anna Cahya Kuendo Yana Sambeka