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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

Author-ID : 542598

Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT

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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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (636.328 KB)

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

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

UJI AKTIVITAS ANTIBAKTERI POLIEUGENOL BERAT MOLEKUL TINGGI DENGAN PENAMBAHAN EKSTRAK DAUN PALA (Myristica fragrans Houtt) Misba Anggriani; Erwin Abdul Rahim; Syamsuddin Syamsuddin
KOVALEN: Jurnal Riset Kimia Vol. 4 No. 2 (2018): Edisi Agustus
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

Telah dilakukan uji aktivitas antibakteri polieugenol dengan penambahan ekstrak daun pala terhadap bakteri Staphylococcus aureus dan Escherichia coli. Polieugenol disintesis melalui metode polimerisasi kationik menggunakan katalis H2SO4-CH3COOH dengan perbandingan 4 : 1. Polieugenol yang dihasilkan memiliki berat molekul sebesar 2.18 x 107 g/mol, berbentuk padat dan berwarna coklat. Pengujian aktivitas antibakteri campuran polieugenol dan ekstrak daun pala menggunakan metode difusi sumur. Konsentrasi campuran polieugenol dan ekstrak daun pala divariasikan: 1% 2% 3% 4% dan 5% (b/v). hasil pengujian menunjukkan bahwa campuran polieugenol dan ekstrak daun pala mempunyai aktivitas antibakteri terhadap Staphylococcus aureus pada konsentrasi 1% 2% 3% 4% dan 5% berturut-turut sebesar 15,06 mm, 16,93 mm, 18,51 mm, 19,69 mm, dan 20,99 mm. sedangkan pada Escherichia coli nilai daya hambat yang dihasilkan berturut-turut sebesar 17,5mm, 18,22 mm, 18,90 mm, 19,05 mm dan 19,45 mm. nilai daya hambat yang dihasilkan polieugenol pada Staphylococcus aureus setelah penambahan ekstrak daun pala mengalami penurunan, sedangkan pada Escherichia coli terjadi peningkatan nilai daya hambat yang tidak signifikan.Kata Kunci : Polieugenol, Ekstrak Daun Pala, Antibakteri

PENGARUH SUHU INKUBASI TERHADAP AKTIVITAS LIPASE DAUN PEPAYA (Carica papaya L) YANG DIAMOBILISASI DALAM PASIR LAUT Fisty Sumangkut; Nurhaeni; Ni Ketut Sumarni; Erwin Abdul Rahim
KOVALEN: Jurnal Riset Kimia Vol. 5 No. 2 (2019): Edisi Agustus
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

The silica content in sea sand can be used to immobilize lipase from papaya leaf. Research on the influence of incubation temperature on sea sand immobilized lipase from papaya leaf (Carica papaya L) has been carried out. The aim of research is determining the influence of incubation temperature on sea sand immobilized lipase from papaya leaf (Carica papaya L). The method used in this study was a completely randomized design with temperature at 30, 40, 50, 60, 70°C. The results show that lipase from papaya leaf (Carica papaya L) had successfully immobilized in the sea sand and the optimum temperature stability of lipase immobilized in sea sand at 50°C with an activity is 53.000 µmol/g.jam Keywords : immobilized, lipase, papaya leaf, sea sand.

EKSTRAKSI PEKTIN PADA KULIT BUAH KLUWIH (Artocarpus camansi Blanko) PADA BERBAGAI SUHU DAN KONSENTRASI ASAM SITRAT Reski Putriani Demsi; Ruslan Ruslan; Erwin Abdul Rahim; Hardi Ys
KOVALEN: Jurnal Riset Kimia Vol. 5 No. 1 (2019): Edisi April
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

Telah dilakukan penelitian tentang ekstraksi pektin pada kulit buah kluwih (Artocarpus camansi Blanko) pada berbagai suhu dan konsentrasi asam sitrat. Penelitian ini bertujuan untuk mengetahui konsentrasi dan suhu ekstraksi yang menghasilkan pektin dari kulit buah kluwih (Artocarpus camasni Blanko) dengan rendemen tinggi. Penelitian ini menggunakan Rancangan Acak Lengkap (RAL) dengan empat variasi suhu (90 oC, 100 oC, 110 oC dan 120 oC) dan empat variasi konsentrasi (5%, 7%, 9%, dan 11%), dengan menggunakan metode ekstraksi meserasi. Hasil penelitian ini menunjukan rendeman tertinggi didapatkan pada konsentrasi 9% sebesar 35,65% dan suhu 90 oC sebesar 40,69%. karakteristik terhadap pektin adalah kadar metoksil 8,12 %, kadar galakturonat 41,88 %.Kata Kunci : Ekstraksi pektin, kadar metoksil, kadar galakturonat

PEMBUATAN Carboxymethyl cellulose (CMC) DARI PELEPAH NANAS (Ananas cosmosus Merr.) Ripdayana Ripdayana; Ahmad Ridhay; Erwin Abdul Rahim
KOVALEN: Jurnal Riset Kimia Vol. 5 No. 2 (2019): Edisi Agustus
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

A research about production of Carboxymethyl cellulose (CMC) from pineapple midrib (Ananas cosmosus Merr.) has been conducted. This research aims to determine the best cellulose ratio with sodium monochloro acetate and the best reaction time to the substitution degree of carboxymethyl cellulose from pineapple midrib fibers. This study used a Completely Randomized Design method with two independent variables, i.e. variations in the weight of sodium monochloroacetate (2.5 grams, 3 grams, 3.5 grams, 4 grams, and 4.5 grams) and variations in reaction time (1 hour, 2 hours, 3 hours, 4 hours , and 5 hours), each treatment was done duplo using 20 treatment units. The result of the study showed that the best ratio of sodium monochloroacetate to cellulose which produced carboxymethyl cellulose from pineapple midribs was 2.5: 2.5 with substitution degree value of 1.93 and optimum reaction time which produced carboxymethyl cellulose from pineapple midribs was 1 hour with substitution degree of 2.38. Keywords: Carboxymethyl cellulose, Pineapple midrib

SINTESIS DAN KARAKTERISTIK POLIEUGENOL DARI EUGENOL MENGGUNAKAN KATALIS H2SO4 – CH3COOH Sitti Ainun Hikmah; Erwin Abdul Rahim; Musafira Musafira
KOVALEN: Jurnal Riset Kimia Vol. 4 No. 3 (2018): Edisi Desember
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

Telah dilakukan sintesis polieugenol dan karakteristiknya dari eugenol menggunakan katalis H2SO4 – CH3COOH. Sintesis dilakukan dengan cara polimerisasi kationik dengan perbandingan eugenol dengan katalis H2SO4 – CH3COOH adalah 4:1. Dalam penelitian ini polieugenol diperoleh dari proses sintesis dan ditentukan berat molekulnya dengan metode viskometri serta karakteristiknya. Hasil penelitian menunjukkan berat molekul 776.247,12 g/mol. Karakteristik polieugenol berbentuk padat, berwarna coklat dengan titik leleh 84oC – 90 oC. Tidak larut dalam air, n-heksan, benzena tetapi larut dalam etanol, etil asetat dan kloroform. Produk sintesis memiliki konduktivitas 176,4 volt dengan kekuatan arus listrik 0,05 A dan 16,80 ohm.Kata Kunci : Eugenol, polimerisasi kationik, polieugenol

TRANSESTERIFIKASI IN SITU BIJI KELOR (Moringa oleifera Lam) MENGGUNAKAN POLIMER BERBAHAN DASAR EUGENOL SEBAGAI PENYANGGA KATALIS H2SO4 achmad rihday; Erwin Abdul Rahim; Syaiful Bahri; Dwi Juli Pusptasari
KOVALEN: Jurnal Riset Kimia Vol. 5 No. 3 (2019): Edisi Desember
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

A study of in situ transesterification of Moringa (Moringa oleifera) seeds with polymer based on eugenol catalyst support have been carried out. The aim of the study is to determine the concentration of eugenol-based polymer support catalyst which was used to produce fatty acid methyl esters with the highest yield, and best time and to determine the composition of fatty acid methyl esters found in transesterification in situ. The results showed that the catalyst concentration of 1% with a reflux time of 150 minutes resulted in a yield of 12.04% methyl ester. The results of analysis of methyl esters using GC-MS contain methyl stearate and methyl-9,12-octadecanoate compounds. The characteristics of methyl ester are water content of 1.23%, acid number of 11.60 mgKOH/gram, saponification number of 0 mg NaOH/gram, and pour point of 16˚C. Keywords: Moringa seed, eugenol as a catalyst support H2SO4, transesterification

Perbandingan Kadar Albumin Ikan Gabus (Channa striata) dari Proses Perebusan dan Pengukusan dengan Menggunakan Uji Biuret: Comparison of Cork Fish (Channa striata) Albumin Content from Boiling and Steaming Process by Using Biuret Test Sulfitri Suardi; Syaiful Bahri; Khairuddin; Ni Ketut Sumarni; Erwin Abdul Rahim
KOVALEN: Jurnal Riset Kimia Vol. 6 No. 1 (2020): Edisi April
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/kovalen.2020.v6.i1.12699

Cork Fish (Channa striata) is a freshwater fish that was spread throughout most of Indonesia and it contains albumin that was beneficial to the human body. Albumin was easily dissolved in water during the cooking process both boiled and steamed. This study aims to determine the influence of boiling and steaming times at 100oC against albumin content of cork fish that lost and left in fish meat. The times of boiling and steaming that was used to processing the fish were 10, 15, and 20 minutes. The albumin concentration that lost and left in for the boiling and the steaming process was determined by the biuret test that used a UV-Vis spectrophotometer at albumin maximum wavelength of 530 nm. The results showed that albumin content that lost for 10 minutes boiling process (62 mg/10g) was smaller than the other boiling times and albumin left in fish meat was 164 mg/10g. The same result was also obtained at 10 minutes steaming process which results left in albumin content of 167 mg/10g and lost albumin of 62 mg/10g. The albumin content that lost or dissolved in water for the steaming process was smaller than the boiling process, therefore the steaming process is more efficient than the boiling process at cork fish processing. Keywords: Cork fish, albumin, boiling, steaming.

Sintesis Metil Ester Asam Lemak dari Biji Alpukat (Parsea americana Mill) Menggunakan Polimer Penyangga Katalis Berbahan Dasar Eugenol: Synthesis of Fatty Acid Methyl Ester from Avocado Seeds (Parsea americana Mill) using Polymer Support Catalyst Based on Eugenol Sumarni; Erwin Abdul Rahim; Ni Ketut Sumarni; Ruslan; Hardi Ys.; Moh. Mirzan
KOVALEN: Jurnal Riset Kimia Vol. 6 No. 3 (2020): Edisi Desember
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/kovalen.2020.v6.i3.13053

Research on the manufacture of methyl esters from avocado seeds (Parsea americana Mill) with eugenol-based catalysts has been conducted. The aim is to determine the catalyst concentration used to produce methyl esters with the highest rendement and determine the composition of fatty acid methyl ester in avocado seeds. This study was used variations in concentrations of 0.25%, 1%, 1.75%, 2.25%, and 3%. The results of this study showed that the best concentration is 2.25% with the calculation of the results of 24.8% methyl esters in avocado seeds, namely lignoceric and octadecenoic acid methyl ester. Keywords: Avocado seeds, fatty acid methyl esters

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

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