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All Journal Jurnal MIPA IPTEK Journal of Proceedings Series Indonesian Journal of Pure and Applied Chemistry Fullerene Journal of Chemistry Jurnal Review Pendidikan dan Pengajaran (JRPP)
Chaleb Paul Maanari
Universitas Negeri Manado
Biochemistry, Genetics & Molecular Biology Chemistry Computer Science & IT Economics, Econometrics & Finance Education Languange, Linguistic, Communication & Media 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.
Pengaruh Katalis Terhadap Rendemen Reaksi Transesterifikasi Romi Yana Widiawati Br Tarigan; Sanusi Gugule; Jeanne Maria Tuerah; Chaleb Maanari
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.v8i2.494

Abstract

Research has been carried out on the effect of a catalyst on the yield of transesterification reactions. Pure coconut oil is made mechanically without heating using fresh coconut meat or what is called non-copra, followed by a base-catalyzed transesterification reaction using KOH and NaOH. The purpose of this study was to determine the effect of the catalyst on the yield of the transesterification reaction. The results of the reaction were analyzed by determining the physico-chemical properties and analysis of Gas Chromatography-Mass Spectrometry (GC-SM). The results showed that the average reaction yield with KOH catalyst was 74.3% and 70% NaOH catalyst. The most dominant GC-SM identification results were ethyl caproate 4.12%, ethyl capricate 4.99%, ethyl laurate 54.97%, ethyl myristate 18.49%, ethyl palmitate 8.13%, 9.12 octadecatrin-1-ol 5.24% and ethyl strearate 2.28%.
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.
Co-Authors Aisyiah Restutiningsih Putri Utami Djois Sugiaty Rintjap Edi Suryanto Feti Fatimah Feti Fatimah Jakub Saddam Akbar Jeanne M. Tuerah Julius Pontoh Miftahul Jannah Mustapa Mustapa Romi Yana Widiawati Br Tarigan Sanusi Gugule Sanusi Gugule Stefan Marco Rumengan Wilce Anna Cahya Kuendo