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All Journal KOVALEN: Jurnal Riset Kimia Jurnal Farmasi Galenika (Galenika Journal of Pharmacy) Jurnal Ekonomika dan Dinamika Sosial
Abdul Rahman Razak
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Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Economics, Econometrics & Finance Health Professions Immunology & microbiology Medicine & Pharmacology

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SINTESIS SURFAKTAN METIL ESTER SULFONAT (MES) DARI METIL LAURAT Nur Iman; Abdul Rahman Razak; Nurhaeni Nurhaeni
KOVALEN: Jurnal Riset Kimia Vol. 2 No. 2 (2016)
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

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Abstract

Synthesis of surfactant methyl ester sulfonate (MES) of methyl laurate has been done. This study aims to determine the best mole ratio between the methyl esters of lauric acid with sulfonated agent NaHSO3 in sulfonated methyl laurate. Mole variation used in this study are 1:1; 1:1,2; 1:1,4 and 1;1,6 (v/w). Best value MES emulsion stability, acid value and the surface tension is 94,5 minutes,1.3 ml KOH/ g sample, 39.3 dyne/cm in 1:4 ratio produces. MES synthesis produced by sulfonate group shown in the FTIR spectra in the wave number around 1366.52 to 1015.30 cm. Keywords : Surfactant Methyl Ester Sulfonate, Methyl Laurate.
HIDROLISIS SELULOSA DARI SEKAM PADI (Oryza sativa) MENJADI GLUKOSA DENGAN KATALIS ARANG TERSULFONASI Adeks Pramana; Abdul Rahman Razak; Prismawiryanti Prismawiryanti
KOVALEN: Jurnal Riset Kimia Vol. 2 No. 3 (2016)
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

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Cellulose hydrolysis from rice husk (Oryza sativa) into glucose with sulfonated charcoal catalyst was conducted. The aim of this research was to determine sulfuric acid concentration and contact time on the sulfonation process of charcoal which would produce the highest glucose rendement from cellulose hydrolysis of rice husk. Sulfuric acid concentrations in this experiment were 8, 10, and 12 N with variation of contact time of 4, 6, 8, 10 and 12 hours respectively.  Rice husk was delignified with NaOH 10% to produce cellulose which was hydrolyzed by sulfonated charcoal catalyst. Hydrolysis reaction with the ratio cellulose/aquadest 1:25 (w/v) was conducted in autoclave with temperature 130 oC for 3 hours. The result showed that 8 N concentration of sulfuric acid and 12 hours of contact time produced the highest glucose rendement 17,9%. Keywords : rice husks, cellulose, glucose, sulfonated charcoal
PRODUKSI DAN UJI AKTIVITAS ENZIM KITINASE DARI ISOLAT BAKTERI TERMOFILIK B1211 ASAL AIR PANAS BORA Jaya Hardi; Jusman Jusman; Abdul Rahman Razak; Silva Silva
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 aims to production of chitinase from thermophylic bacteria that living in Bora hot spring  and to determine of chitinase extracts activity. The research was began with rejuvenated of B1211 bacteria isolates on MSM agar media.  The B1211 isolates was used to production of chitinase extracts on MSM broth media with chitin colloidal concentration of 0.25%, 0.5%, 1%, 2%, 4% and incubation temperature of 30oC (rt), 37oC, 50oC, and 60oC for 3 days. The chitinase activity were analyzed based on N-acetyl-D-glucosamine standard. The results was showed that B1211 bacteria isolates is potential isolate for production chitinase. The highest activity of chitinase from B1211 bacteria isolates of 0.75 U/mL for chitin colloidals concentration of 1% and temperature of 60oC.Keywords : Bora, hot spring, bacteria, thermophylic, B1211 isolates, chitinase.
Uji Aktivitas Antibakteri Sediaan Gel Ekstrak Daun Sereh (Cymbopogon nardus L. Rendle) terhadap Bakteri Staphylococcus aureus Penyebab Jerawat: Anti Bacterial Activity Test Of Extract Gel Formulation Of Lemongrass Leaves (Cymbopogon nardus L. Rendle) on Staphylococcus aureus Acne Causing Bacteria Sarlina Sarlina; Abdul Rahman Razak; Muhamad Rinaldhi Tandah
Jurnal Farmasi Galenika (Galenika Journal of Pharmacy) (e-Journal) Vol. 3 No. 2 (2017): (October 2017)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (177.314 KB) | DOI: 10.22487/j24428744.0.v0.i0.8770

Abstract

Penelitian tentang uji aktivitas antibakteri sediaan gel ekstrak daun sereh (Cymbopogon nardus L.Rendle) terhadap pertumbuhan bakteri Staphylococcus aureus telah dilakukan. Penelitian ini bertujuan untuk mengetahui pengaruh variasi konsentrasi karbopol, konsentrasi ekstrak, dan kombinasi keduanya terhadap stabilitas gel dan aktivitas antibakteri terhadap Staphylococcus aureus. Ekstrak daun sereh (Cymbopogon nardus L.Rendle) diperoleh dengan cara maserasi dengan etanol 96%. Desain penelitian menggunakan analisis data ANOVA rancangan acak lengkap pola faktorial dengan variasi konsentrasi ekstrak 5%, 10%, 15%, 20% dan karbopol sebagai basis gel dengan konsentrasi 0,5%, 1% dan 2%. Evaluasi stabilitas sediaan mencakup uji organoleptis, uji homogenitas, uji pH, uji viskositas, dan uji aktivitas antibakteri. Hasil penelitian menunjukkan bahwa variasi konsentrasi ekstrak mempengaruhi stabilitas dan aktivitas antibakteri gel ekstrak daun sereh (Cymbopogon nardus L.Rendle). Variasi konsentrasi karbopol mempengaruhi aktivitas antibakteri tetapi tidak mempengaruhi stabilitas. Kombinasi variasi konsentrasi karbopol dan ekstrak mempengaruhi aktivitas antibakteri. Kombinasi perlakuan yang baik diperoleh pada formula A2B4, karena memiliki aktivitas antibakteri tertinggi yaitu 14,56 mm.
Kajian Dampak Investasi dan Inflasi terhadap Peluang Kerja melalui Pertumbuhan Ekonomi di Pusat Perekonomian Kawasan Tengah Indonesia Tia Aulia; Abdul Rahman Razak; Sabir
Jurnal Ekonomika dan Dinamika Sosial Vol. 3 No. 01 (2024): Jurnal Ekonomika dan Dinamika Sosial
Publisher : Departemen Ilmu Ekonomi, UNHAS

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Abstract

Penelitian ini mencoba menganalisis pengaruh investasi dan inflasi terhadap kesempatan kerja melalui pertumbuhan ekonomi di propinsi Sulawesi Selatan (Kasus 5 Kabupaten/Kota). Metode analisis yang digunakan yaitu analisis jalur menggunakan data sekunder. Variabel dependen dalam penelitian ini adalah kesempatan kerja, variabel independen dalam penelitian ini adalah investasi dan inflasi, adapun variabel intervening atau variabel mediasi dalam penelitian ini adalah pertumbuhan ekonomi. Hasil penelitian menunjukkan bahwa investasi berpengaruh signifikan terhadap pertumbuhan ekonomi dan kesempatan kerja, inflasi tidak berpengaruh secara signifikan terhadap pertumbuhan ekonomi dan kesempatan kerja dan pertumbuhan ekonomi tidak berpengaruh secara signifikan terhadap kesempatan kerja. Kata kunci: kesempatan kerja, pertumbuhan ekonomi, investasi, inflasi.
Faktor Penentu Penghasilan Kafe di Perkotaan Fathur, Muhammad Fathurullah Syahrul; Abdul Rahman Razak; Mirzalina Zaenal
Jurnal Ekonomika dan Dinamika Sosial Vol. 3 No. 01 (2024): Jurnal Ekonomika dan Dinamika Sosial
Publisher : Departemen Ilmu Ekonomi, UNHAS

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Abstract

This study aims to understand and analyze how big the influence of capital, the total of labour and length of business to the income of cafe business in Makassar City. That data analysis method that used are multiple linear regression with spss 25 application. The data that used by this study are primary data that collected by questionnaire and interview to cafe business owner in Makassar city. Based on the estimation result shows that capital, labour and length of business variable has positive influence and significant to income. This study shows the more capital, total labour and length of business means the higher the income that will be received by the cafe business owner in Makassar city.
Co-Authors Adeks Pramana Fathur, Muhammad Fathurullah Syahrul Jaya Hardi Jusman, Jusman Mirzalina Zaenal Muhamad Rinaldhi Tandah Nur Iman Nurhaeni Nurhaeni Prismawiryanti Prismawiryanti Sabir Sarlina Sarlina Silva Silva Tia Aulia