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All Journal Natural Science: Journal of Science and Technology KOVALEN: Jurnal Riset Kimia Indonesian Journal of Chemistry
Erwin Abdul Rahim
Jurusan Kimia FMIPA Universitas Tadulako
Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT

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Journal : KOVALEN: Jurnal Riset Kimia

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SINTESIS ABSOLUT ASIMETRIK BARU Erwin Abdul Rahim
KOVALEN: Jurnal Riset Kimia Vol. 2 No. 1 (2016)
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

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Abstract

ABSTRACT New absolute asymmetric syntheses have been found.  Eugenol based-acetylenes monomers have been synthesized, corresponding three compounds and one unknown compound.  Two compounds are crystal chiral (1 and 2) and one (3) not.  Polymerization of chiral crystal and not were different although the structure is same.  After recrystalization polymerization of 1 and 2 compare with 3 also different.  This is one example of new absolute asymmetric synthesis. Keywords : New absolute asymmetric synthesis, eugenol, unknown compound, chiral crystal.
APLIKASI KULIT PISANG KEPOK (Musa paradisiaca formatypica) SEBAGAI ADSORBEN ION MERKURI (Hg) Musafira Musafira; A. Risman; Erwin Abdul Rahim
KOVALEN: Jurnal Riset Kimia Vol. 2 No. 1 (2016)
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

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ABSTRACT The study aims are to determine the influence of the best of smooth and the best of volume eluent of the concentration of ion mercury (II) the colomn with the flow from top to bottom. These are used has a diameter 1 cm, height 35 cm and adsorbent 5 g. The variations upon the smooth which is used 10, 20 and 30 mL/minute ad the volume of eluent 10, 50, 100 and 150 mL with a concentration 60 mg/L at pH 5. This study is using random the factorial, each treatment done as much as two times. From the results showed that the best of smooth be achieved in the smooth 10 mL/minute and the best of volume eluent be achieved in the volume of 150 mL in adsorption of ion mercury (II). Keywords : Smooth, Volume of eluent, Kepok banana’s peels, Mercury.
SINTESIS ETIL LAURAT DARI ASAM LAURAT MENGGUNAKAN KATALIS ASAM SULFAT PEKAT Andi Nursyafinah; Nurhaeni Nurhaeni; Erwin Abdul Rahim
KOVALEN: Jurnal Riset Kimia Vol. 2 No. 2 (2016)
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

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The aims of these research are to find out the comparison of the ratio of lauric acid molar and ethanol  (m/v), the time of mixing and the best catalyst volume to produce lauric ethyl with the highest degree of esterification by using volumetric method. Synthesize of ethyl lauric from lauric acid with ethanol did by using thick sulphate acid p.a as the catalyst with comparison of lauric acid with ratio 1:3, 1:4, 1:5, 1:6, 1:7. The variation of mixing time are 1, 2, 3, 4, 5 hour. The catalyst variation are 1, 2, 3, 4, and 5 mL. This research used random variable in the confidence interval 95%. The result of this research showed that the best molar lauric acid ratio and ethanol is 1: 7 (m/v) and esterification degree is 59,701 %. The best mixing time is 5 hour, and esterification is 53,283%, While catalyst volume variation is 1 mL with esterification degree 87,611 % Keywords : Lauric Acid, Ethyl Lauric, Esterification Degree, Volumetric Method
SINTESIS DAN KAREKTERISASI SENYAWA KIRAL HASIL REAKSI ANTARA METILEUGENOL KASAR DENGAN ASAM ASETAT Muh. Hajir S. Lasapo; Erwin Abdul Rahim; Ruslan Ruslan; Indriani Indriani
KOVALEN: Jurnal Riset Kimia Vol. 2 No. 3 (2016)
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

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The research about synthesis and characterization of chiral compounds from the rough methyleugenol with acetic acid as the catalyst has been done. The goal is to determine the  content of 1-(3,4-dimetoksifenil)-2-propanil acetate compound which is produced in the reaction process of metileugenol with acetic acid and to characterizased the chemical compound of the product. The results showed that the content of 1-(3,4-dimetoksifenil)-2-propanil acetate compound that has been obtained was  45.87% with a molecular weight of 238.Keywords : Methyleugenol, Chiral, FT-IR, GC-MS
PEMANFAATAN SANTAN INSTAN KADALUARSA UNTUK PRODUKSI MINYAK SECARA FERMENTASI Megmerio Soro; Syaiful Bahri; Erwin Abdul Rahim
KOVALEN: Jurnal Riset Kimia Vol. 2 No. 3 (2016)
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

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This research use the expired instant coconut milk for 2 months. The goal is to find out whether the coconut milk can be used to produce oil. The method does is with variation of the total  number of laru 0,5 mL oil; 0,75 mL; 1 mL; 1,25 mL; and 1,50 mL by volume per volume (v/v). the fermentation time and 18 hours, 24 hours, 30 hours, and 36 minutes. Results of the study that the amount of oil the oil laru yield the highest oil is 1,50 mL with 28% yield and fermentation time of 30 hours, while the lowest was at the time of fermentation 18 hours i.e. 15%.Keywords: instant coconut milk, expired, coconut oil, yeast, oil, quality and  yield
SINTESIS KARBOKSIMETIL SELULOSA (CMC) DARI SELULOSA KULIT DURIAN (Durio zibethinus) Dini Safitri; Erwin Abdul Rahim; Prismawiryanti Prismawiryanti; Rismawati Sikanna
KOVALEN: Jurnal Riset Kimia Vol. 3 No. 1 (2017): Edisi April
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

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Abstract

The investigation about of carboxymethyl cellulose (CMC) of Durian peel  (Durio zibethinus) cellulose has been done. The research aim is to determine the best ratio of sodium mono-chloroacetate toward cellulose and is to determine the reaction time in the synthesis of carboxymethyl cellulose of durian peel in order to obtain the highest substitution degree. The applied of ratio variations and reaction time were 5:5, 6:5, 7:5, 8:5, 9:5 grams and 1, 2, 3, 4, 5, respectively. The result showed that the best ratio of sodium mono-chloroacetate toward cellulose was 7:5 gram with yields and the substitution degree of 39.39% and 1.17, respectively. The best time reaction was found at 4 hours with yields and the substitution degree of 39.77 % and 1.2, respectively. Keywords: Durian peel, carboxymethyl cellulose, substitution degree.
PENGARUH PERBANDINGAN MOL ASAM STEARAT TERHADAP ETANOL DAN WAKTU REAKSI PADA SINTESIS ETIL STEARAT Ahmad Kamal; Nurhaeni Nurhaeni; Erwin Abdul Rahim
KOVALEN: Jurnal Riset Kimia Vol. 3 No. 2 (2017): Edisi Agustus
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

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Abstract

Telah  dilakukan penelitian tentang pengaruh perbandingan mol dan waktu reaksi pada sintesis etil stearat menggunakan katalis asam sulfat pekat. Penelitian ini bertujuan untuk mendapatkan rasio mol asam stearat/etanol dan waktu reaksi esterifikasi yang menghasilkan derajat esterifikasi yang tinggi. Variabel yang diamati yaitu rasio mol asam stearat/etanol (m/v) 1:4, 1:5, 1:6, 1:7, dan 1:8. Selanjutnya variasi waktu reaksi esterifikasi yaitu 3 jam, 4 jam, 5 jam, 6 jam, dan 7 jam. Hasil penelitian menunjukkan rasio mol asam stearat/etanol terbaik yaitu 1:8 dengan derajat esterifikasi 83,08%. Sedangkan waktu reaksi esterifikasi terbaik diperoleh pada waktu 5 jam dengan derajat esterifikasi 90,8%. Kata Kunci : Asam Stearat, Etil Stearat, Derajat Esterifikasi
SINTESIS DAN SIFAT KOPOLIMER KRISTAL KIRAL METIL EUGENOL DAN EUGENOL Erwin Abdul Rahim; Fadhillah Fadhillah; Musafira Musafira
KOVALEN: Jurnal Riset Kimia Vol. 3 No. 2 (2017): Edisi Agustus
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

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Abstract

Sintesis dan sifat kopolimer kristal kiral metil eugenol dan eugenol telah dilakukan. Tujuan dari penelitian ini adalah untuk mengetahui kelarutan kopolimer dan pengaruh kristal kiral terhadap berat molekul kopolimer yang dihasilkan. Reaksi adisi, kopolimerisasi dan metode viskometri yang digunakan dalam penenlitian ini, untuk mengidentifikasi menggunakan Fourier Transform Infra Red (FT-IR) dan spektrofotometri UV-Vis. Berat molekul kopolimer sebelum pemurnian sebesar 78.595,91 g/mol dengan rendemen 92,24% yang berupa padatan berwarna merah keunguan dan setelah pemurnian diperoleh berat molekul sebesar 14.484,38g/mol dengan rendemen 62,24% berupa padatan berwarna kuning kecoklatan. Kopolimer yang diperoleh larut dalam etanol, kloroform, etilasetat, sedikit larut dalam n-heksan dan tidak larut dalam air. Hasil  spektrum UV-Vis yang melebar pada panjang gelombang 450-500 nm menunjukan bahwa senyawa yang dihasilkan berbentuk heliks. Kata Kunci : Kristal Kiral Metil Eugenol, Eugenol, Kopolimer, Polimer Heliks.
SINTESIS HIDROKSIAPATIT DARI TULANG SAPI DENGAN METODE BASAH PADA BERBAGAI WAKTU PENGADUKAN DAN SUHU SINTERING Reflin Yuliana; Erwin Abdul Rahim; Jaya Hardi
KOVALEN: Jurnal Riset Kimia Vol. 3 No. 3 (2017): Edisi Desember
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

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Abstract

Synthesis of hydroxyapatite (HAp) can be obtained from a reaction between calcium of cow bones and phosphate under wet method. Completely Random Design (CRD) was used in this research with three levels of stirring time and four levels of sintering temperature i.e. 60, 90, 120 minutes and 800oC, 850oC, 900oC, 950oC, respectively. The result showed that synthesis reaction at the sintering temperature of 850oC for 120 minutes were the best conditions to produce HAp. The yield of HAp product in those conditions was 48,5%. XRD spectrum of HAp had the highest intensity of 1000 at a 2Ɵ angel of 31.78o.Keywords: Hydroxyapatite, Stirring Time, Sintering Temperature, Cow Bone
PEMBUATAN MEMBRAN SELULOSA ASETAT DARI SELULOSA PELEPAH POHON PISANG Dina Apriana Putri Husni; Erwin Abdul Rahim; Ruslan Ruslan
KOVALEN: Jurnal Riset Kimia Vol. 4 No. 1 (2018): Edisi April
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (742.312 KB) | DOI: 10.22487/kovalen.2018.v4.i1.10182

Abstract

Penelitian ini bertujuan untuk mengetahui penambahan rasio polietilen glikol pada selulosa asetat yang menghasilkan karakteristik membran selulosa asetat terbaik. Selulosa diperoleh dari proses ekstraksi pelepah pohon pisang. Selulosa asetat diperoleh dari sintesis selulosa. Pencetakan membran dilakukan dengan melarutkan selulosa asetat ke dalam pelarut aseton 1:45 (b/v) dan ditambahkan pemlastis PEG dengan variasi 0; 2; 4; 6; dan 8 %. Membran diuji ketebalannya menggunakan micrometer sedangkan untuk kuat tarik dan elongasi diuji dengan Universal Testing Machine.  Rendemen selulosa yang diperoleh adalah 62,5 %. Rendemen selulosa asetat dari hasil sintesis adalah 50 %. Berat molekul selulosa asetat 24.961,48 g/mol. Karakteristik membran terbaik diperoleh pada penambahan PEG 8% yang memiliki ketebalan 0.0206 mm, kuat tarik sebesar 20,29 MPa, dan elongasi sebesar 3%.Kata Kunci : Selulosa, Selulosa Asetat, Membran, PEG
Co-Authors A. Risman Abd. Rahman Razak Abustiana, Rahma Lolita achmad rihday Ahmad Kamal Ahmad Ridhay Aini Auliana Amar Andi Nursyafinah Andi Tenri Ajeng Dina Apriana Putri Husni Dini Safitri Djumidar Dwi Juli Puspitasari Dwi Juli Pusptasari Eka Lindawati Fadhillah Fadhillah Fatiah Riskah Fisty Sumangkut Frischa Sari Kencana Gilang Almilda Grace Sita Turumi Hardi Ys Hardi Ys. Heince Andre Pua Husain Sosidi Husain Sosidi Inda, Nov Irmawati Indriani Indriani Indriani Indriani Indriani Indriani Indriani Jaya Hardi Jusman, Jusman Khairuddin Khairuddin Laksono Trisnantoro Mappiratu Mappiratu Megmerio Soro Misba Anggriani Moh. Mirzan Moh. Mirzan Moh. Mirzan Moh. Rifki Saputra Muh. Hajir S. Lasapo Musafira Musafira Musafira Musafira Musafira Musafira Ni Ketut Sumarni Nov Irmawati Inda Nur Istiqomah Nurakhirawati Nurhaeni Nurhaeni Nurhaeni Nurhaeni Nurhaeni Nurhaeni Nurhaeni Prismawiryanti Prismawiryanti Ramli, Aksar Reflin Yuliana Reski Putriani Demsi Ripdayana Ripdayana Rismawati Sikanna Ruslan Ruslan Ruslan Sitti Ainun Hikmah Sitti Nur Halizah Sulfitri Suardi Sumarni Syaiful Bahri Syaiful Bahri Syamsuddin Syamsuddin WILDA YANTI