Journal Information
ISSN / EISSN : 2302-2736 / 2549-9335
Current Publisher: Universitas Islam Negeri Alauddin Makassar (10.24252)
Total articles ≅ 73
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Khairun Nisah
Al-Kimia, Volume 8; doi:10.24252/al-kimia.v8i1.10566

The results of Esterification of waste frying oil is used in this study as bioplastic plasticizers. Sago plate (Genus Metroxxlen, SP), as bioplastic matrix due to amylopectin content. This study intend to utilize waste frying oil and increase the benefits of sago as a bioplastic. The method of making bioplastics by heating 600 C. Characteristics are carried out based on the properties of mechanical properties (Tensile strength), morphology (organoleptic), functional groups (FT-IR), transparasi (UV-VIS), water resistance, and degradation. The composition made, from sago and glycerol (0.5: 1; 1: 1; 0.5: 2; 0.5: 3) produced the best bioplastic with sago composition and glycerol is 0.5: 3. Characteristics that It was observed in the form of elongation of 4.10%, tensile strength 7.08 Kgf / m2, water resistance 0.0037%, transparency of 0.086%, functional groups with absorption in the area of 2924.5 cm-1 which showed alkane compounds, namely streching CH in the area of 2850-3000 cm-1. Streching -O- ether is at 1639.05 cm-1, then the absorption at 3290.86 cm-1 is the -OH functional group absorption. Degradation on day 15 shows a greater decay yield of 34.68 mg. Surface morphology that is not smooth, due to the presence of pores and cracks, this situation is possible due to the lack of OH content in glycerol from used cooking oil.
Sri Widya Astuti Abidin, Nurmalasari Nurmalasari, Sumiati Sumiati, Ayu Ramadani
Al-Kimia, Volume 8; doi:10.24252/al-kimia.v8i1.10750

This study aims to determine the effect of adding Bleaching Earth (BE) catalyst to the amount of liquid fraction by pyrolysis of Low Density Polyethylene (LDPE) and find out the concentration of gasoline and diesel fractions from plastic pyrolysis Low density polyethylene (LDPE). The method in this study is the pyrolysis method (heating without oxygen) and analysis of the liquid fraction resulting from pyrolysis using GCMS (Gas Chromatrographic Mass Spectrometry). In this study, the effect of adding Bleaching Earth (BE) catalyst on Low Densiry Polyethylene plastic pyrolysis is the more catalyst used, the lower the quantity of liquid fraction. Based on GCMS analysis on plastic pyrolysis of Low Density Polyethylene (LDPE) from various variations of Bleaching Earth (BE) catalysts used the optimum concentration was obtained by adding 2.5 g, 5 g, and 7.5 g Bleaching Earth (BE) catalysts to produce fractions higher diesel (C13-C20), 37.04%, 31.04% and 35.59% respectively
Mohammad Arfi Setiawan, Brilian Gema Morentera
Al-Kimia, Volume 8; doi:10.24252/al-kimia.v8i1.6368

Biodiesel is synthesized from the trans-esterification reaction of vegetable oil and alcohol using a catalyst such as acids, bases or enzymes. The acid catalyst that is often used is sulfuric acid; H2SO4, and HCl while most of base catalysts are NaOH and KOH. The aim of this study is to determine the effect of carbon derived from sugar heating in the synthesis of biodiesel with a sulfuric acid catalyst; H2SO4. Trans-esterification reaction of Jatropha oil and methanol with sulfuric acid catalyst was done with oil and methanol at 1:9 ratio. The results showed that (1) the physical properties of the biodiesel was synthesized with carbon-H2SO4 has a difference with physical properties the biodiesel was synthesized by sulfuric acid (2) carbon-H2SO4 was used in the trans-esterification reaction of Jatropha oil and methanol to produce methyl ester character is the density of 0.889 g / mL, 24.59 cSt viscosity and refractive index of 1.464, (3) methyl ester produced from the reaction of trans-esterification of Jatropha oil and methanol with sulfuric acid catalyst has a character that is a density of 0.882 g / mL, 11.70 cSt viscosity and refractive index of 1.458.
Yayan - Sunarya, Heli Siti H, Munawaroh Munawaroh, Gun Gun Gumilar
Al-Kimia, Volume 8; doi:10.24252/al-kimia.v8i1.7230

Corrosion control on petroleum pipe wells can only be done through the addition of corrosion inhibitors. In this study, the corrosion inhibitors studied were sourced from marine microorganisms, namely the type of microalgae Tetraselmis chuii sp. The aim to be achieved in this study was to determine the mechanism and efficiency of inhibition of the extraction of microalgae biomass in corrosion of carbon steel in an environment of petroleum conditions. To achieve this goal, a potentiodynamic polarization method (Tafel extrapolation) was used and the Electrochemistry Impedance Spectroscopy (EIS) method used the galvanostat-potentiostat device (Voltalab 40, PGZ 301). The results obtained from this study indicate that API 5L X65 carbon steel in the petroleum environment is very significantly corroded, caused by acidic media derived from acetic acid and dissolved CO2. The inhibition ability of the Tetraselmis chuii sp. Biomass extract. in line with the increasing extraction concentration reaching optimum at a concentration of 250 ppm with inhibition efficiency reaching 70%. The mechanism of inhibition takes place through the formation of a protective layer adsorbed on the surface of carbon steel. The protective membrane formed is uneven and tends to be porous.
I Ketut Lasia, Ni Made Wiratini
Al-Kimia, Volume 8; doi:10.24252/al-kimia.v8i1.7635

This study aims to determine the effect of calcination temperature and steaming time on the activation of freundlich isotherm practicum waste (LPIF) in the Analytical Chemistry Laboratory. The LPIF was taken from the waste of the Physical Chemistry Practicum at the Analytical Chemistry Laboratory, Department of Chemistry, Ganesha University of Education. To achieve the research objectives, the LPIF was calcined at 165oC and 195oC, then steamed with 900 mL of distilled water at 400oC for 60 minutes and 45 minutes, respectively. The results of LPIF activation were characterized by absorption, increasing of absorption, FTIR spectrum, and SEM morphology. The results of the study showed that there were influences of calcination temperature and steaming time on LPIF in the Analytical Chemistry Laboratory. The best temperature of calcination and steaming time for activation of LPIF was calcination temperature of 195oC and steaming for 45 minutes.
Ella Hasanah, Ni Komang Ayu, Dela Puspita, Sukarti Sukarti
Al-Kimia, Volume 8; doi:10.24252/al-kimia.v8i1.10079

Penelitian ini bertujuan untuk mengetahui aktivitas ekstrak etanol daun Bilajang Bulu (Merremia vitifolia) terhadap bakteri Staphylococcus aureus. Dewasa ini, salah satu tumbuhan yang di manfaatkan sebagai obat oleh masyarakat terutama masyarakat di Kabupaten Luwu Provinsi Sulawesi Selatan, yaitu tumbuhan Bilajang Bulu. Air dari perasan Daun Bilajang dipercaya oleh masyarakat sekitar dapat mengurangi kadar gula darah dan daunnya dimanfaatkan sebagai obat untuk mempercepat penyembuhan jika terjadi luka pada penderita diabetes. Hal ini dikarenakan tumbuhan Merremia vitifolia meliliki senyawa aktif berupa flavonoid yang merupakan senyawa aktif yang berfungsi sebagai antivirus, insektisida dan antibakterisida. Metode pada penelitian ini melalui preparasi sampel daun Merremia vitifolia yang dikeringkan dengan diangin-anginkan, ekstraksi sampel dengan metode maserasi menggunakan etanol 96%, kemudian diuji aktivitasnya menggunakan bakteri staphylococcus aureus. Hasil penelitian diperoleh konsentrasi yang memberikan aktivitas paling optimal yaitu pada konsentrasi 20% dengan rata-rata zona bening 9,5 mm.
Fredy Z Saudale
Al-Kimia, Volume 8; doi:10.24252/al-kimia.v8i1.9463

One of the strategies applied in the initial steps of drug design and discovery is by utilizing the availability of 3D protein structures. However, most of functional protein structures have not been fully obtained experimentally to date. This is due to the difficulty of procedures, the high cost and the length of time required from structural biology experiments such as X-ray crystallography. Comparative homology modeling is a computational method that is proven to be accurate in predicting the structure of 3D target proteins with a ratio of 30% similarity to the arrangement of amino acids in the structure of the template proteins. This review attempts to explain comparative homology modeling methods such as MODELLER, PHYRE2, SWISS-MODEL, its iterative steps in predicting and building 3D protein target models, its evaluation and validation of protein models as well as the examples of their application in drug design and development targeting GPCR proteins, Zika virus RNA polymerase and HIV protease. With this, comparative homology modeling can be very useful to accelerate research on drug design and development in dealing with diseases and health problems that still exist in the society.
Novia Suryani, A Ghanaim Fasya, Rurini Retnowati, Akyunul Jannah
Al-Kimia, Volume 8; doi:10.24252/al-kimia.v8i1.11965

L-menthyl acetic is an ester with specific aroma that synthesized by reaction of l-menthol and acetic anhydride and useful in fragrance industry. This paper reports influenced variation of time reaction toward ester product and characteristics l- menthyl acetic based on TLC, FTIR, GC and GC-MS. Reaction using l-menthol, acetic anhydride and catalyst H­2­SO­4­ 98 % in diethyl eter solvent at temperature 60 °C with variation of time reaction (45, 60, 75, 90, 105 minutes). The result of research is variation of time influence product with highest yield 88,43 % for 90 minutes. Monitoring TLC achived R­f­ = 0,82; analysis by FTIR achived specific wave number ester 1736,96 cm-1; analysis by GC achived t­r­ = 14,82 minutes and analysis by GC-MS achived t­r­ = 16,13 minutes with base peak m/z = 95.
Retno Aliyatul Fikroh, Sabirin Matsjeh, Chairil Anwar
Al-Kimia, Volume 8; doi:10.24252/al-kimia.v8i1.12024

Pengembangan obat antibiotik dalam menanggulangi penyakit akibat infeksi bakteri semakin meluas. Hal ini diiringi dengan semakin meningkatnya prevalensi retensi terhadap antibiotik. Banyaknya kasus retensi terhadap antibiotik menyebabkan perlu dilakukan pengembangan agen antibakteri yang salah satunya berasal dari senyawa turunan kalkon. Sintesis senyawa turunan kalkon yang memiliki aktivitas dalam menghambat bakteri Bacillus subtilis dan Escerichia coli telah dilakukan. Sintesis senyawa (E)-2’-hidroksi-2-bromo-4,5-dimetoksikalkon melalui reaksi kondensasi Claisen-Schmidt dari senyawa 2-hidroksiasetofenon dengan 2-bromo-4,5-dimetoksibenzaldehida.. Sintesis dilakukan dengan metode refluks dalam kondisi basa menggunakan katalis NaOH dan metanol sebagai pelarut selama 24 jam. Struktur hasil sintesis senyawa turunan kalkon dianalisis dengan FTIR, KLT-scanner, GC-MS, MS-direct, 1H-NMR dan 13C-NMR. Uji antibakteri dilakukan dengan metode difusi cakram (sumuran) terhadap bakteri Bacillus subtilis dan Escherichia coli. Seri konsentrasi senyawa meliputi 1%, 5%, 10%, dan 20% serta digunakan kontrol positif 4-isopropil-3-metilfenol 1%. Hasil penelitian menunjukkan bahwa sintesis senyawa turunan kalkon menghasilkan padatan berwarna kuning dengan rendemen sebesar 78,45%. Daya hambat senyawa kalkon dan 4-isopropil-3-metilfenol sebagai kontrol positif hampir sama untuk kedua bakteri yaitu 15 mm untuk Bacillus substilis dan 13 mm untuk Escherichia coli. Selain itu, uji daya hambat senyawa turunan kalkon terhadap bakteri Bacillus substillis lebih baik dibandingkan pada bakteri Escherichia coli pada konsentrasi 20% dengan zona hambat berturut-turut sebesar 19,7 dan 17,7 nm.
Siti Rodiah, Desti Erviana, Fachtur Rahman, Anissa Widya Budaya
Al-Kimia, Volume 8; doi:10.24252/al-kimia.v8i1.12173

One of alkaline earth metal oxide is calcium oxide, CaO has more attention because it has high strength, low solubility in methanol, and can be synthesized from sources that are easy to obtain. One of the sources of CaO and showed its catalytic properties was the golden snail shell. In this study, synthesize ash golden snail shell modified with fly ash leached and non-leached as a source of silicate (SiO2) has been investigated. The CaO/fly ash catalyst was applied to the transesterification reaction of used cooking oil. There are three catalysts have synthesized, namely golden snail shell calcined (CK), 75% golden snail shell calcined modified by 25% fly ash (CKFA), and by 25% fly ash leached (CKFAL). Based on the results of characterization with spectrophotometer X-Ray Diffraction (XRD), golden snail shell calcined at 900 ˚C containing 93.94% Ca (OH)2. Modified CaO catalyst from golden snail shell and fly ash were active to convert used cooking oil become biodiesel.
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