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Al-Kimia
Al-Kimia is a journal of chemistry that published by Department of Chemistry, Faculty of Science and Technology UIN Alauddin Makassar. The journal is published twice a year on January-June and July-December. This journal encompasses original research articles in all aspects of chemistry and related area. The journal, which was firstly published in July 2013, is a forum for communication of research results, review the results of research, methodologies and new approaches in research related to chemistry in Indonesia.
Articles
101
Articles
Pemanfaatan Limbah Gergaji Kayu Mahoni (Swietenia macrophylla K.) sebagai Energi Alternatif dengan Metode Pirolisis

Saleh, Asri, Nur, Hardiyanti

Al-Kimia Vol 6, No 1 (2018): JUNE
Publisher : Study Program of Chemistry - Alauddin State Islamic University of Makassar

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Abstract

Abstract :The raise of materials need drives alternative new energy such as bio-oil. The sawdust of Mahagony, contained hemicelulose and lignin, was one of potential one to be alternative energy. This research aimed to define the characteristic of  sawdust  with pyrolisis method by using FTIR. The result showed that the heating effected to mass race, viscosity and calorie. The highest value of them were 1.0071 g/cm3, 1.0028 poise and 213.0956 kal/g respectively and the lowest value of them were 1.0025 g/cm3, 0.8600 poise and 13.5350 kal/g repectively. The FTIR spectrum result of Mahagony sawdust was 3426 cm -1  and 1638 cm-1 showed hydrophilic and aromatic compound.

Produksi Energi Listrik dari Limbah Kulit Pepaya (Carica papaya) Menggunakan Teknologi Microbial Fuel Cells

Utami, Lisa, Lazulva, Lazulva, Yenti, Elvi

Al-Kimia Vol 6, No 1 (2018): JUNE
Publisher : Study Program of Chemistry - Alauddin State Islamic University of Makassar

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Abstract

Microbial Fuel Cells (MFCs) is a technology that can produce electricity whilst at the same time treat wastewater. MFCs convert the chemical energy of organic substrates into electricity through catalyzing the anaerobic oxidation process in the anodic compartment by bacteria as a catalyst. This study investigated the generated electricity using peel papaya (Carica papaya) waste. Peel papaya waste was used as the electron donor in the anaerobic anode compartment and KMnO4 was used as acceptor electron in the cathode compartment with methylene blue as mediators. The maximum power density, current, and voltage respectively were 121, 70 mW/m2, 1,79 ampere and 1,095 V at 17 days operation. The pH of the solution was increased from 3,54 to 6,64 on day 12.

Pengaruh Suhu Hidrolisis Terhadap Kadar Glukosa yang Dihasilkan dari Serat Daun Nanas

Muhaimin, Muhaimin

Al-Kimia Vol 6, No 1 (2018): JUNE
Publisher : Study Program of Chemistry - Alauddin State Islamic University of Makassar

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Abstract

The purpose of this study was to determine the effect of temperature on glucose levels produced during the process of hydrolysis of pineapple leaves using 0.5M of sulfuric acid catalyst. The temperature used in the hydrolysis process is 30 °C and 120 °C while the time variation used for the determination of glucose is 0.15,45,75,105,135 minutes. The method of glucose analysis used is to use is phenol-sulfuric acid to determine total glucose. The results showed that the highest glucose level was achieved at 120 °C with a concentration of 15.214,49 ppm at 105 minutes. While the lowest glucose levels achieved at a temperature of 30 °C with levels of 399.33 ppm at 0 minutes.

Pengaruh Komposisi Kitosan Terhadap Sifat Biodegradasi dan Water Uptake Bioplastik dari Serbuk Tongkol Jagung

Alam, Muhammad Nur, Kumalasari, Kumalasari, Nurmalasari, Nurmalasari, Illing, Ilmiati

Al-Kimia Vol 6, No 1 (2018): JUNE
Publisher : Study Program of Chemistry - Alauddin State Islamic University of Makassar

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Abstract

The aim of this research is to obtain the effect of chitosan addition on the properties of biodegradation and water uptake for bioplastics. Bioplastic is made from mixing corncob powder and chitosan using by gliserol as plasticizer. Bioplastic is synthesized for gelatinization temperature of 80oC. Chitosan addition is varied to 2, 4, and 6 g. Based on the analysis, the addition of chitosan can significantly decrease water uptake of bioplastic. The lowest percentage of water uptake was 8.59 % by addition 6 gr chitosan. The highest weight loss percentage of bioplastic was 88,42 % which is obtained by the addition of 2 gr chitosan heaped for 15 days in soil. This indicates that the bioplastic has the high biodegradation properties.  Also, the result of FTIR analysis indicated presence of O-H and N-H groups of bioplastics due to the addition of chitosan and glyserol, but their instensity experienced falling down and shifting at the wave numbers after stockpiled.

Formalin Analysis of Food Ingredients in Palu

Sikanna, Rismawaty, Sarapun, Ivone Venita, Puspitasari, Dwi Juli

Al-Kimia Vol 6, No 1 (2018): JUNE
Publisher : Study Program of Chemistry - Alauddin State Islamic University of Makassar

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Abstract

Research on formalin analysis of food ingredients in Palu has been conducted. The purpose of the research is to find out formalin content in some food. The analyzed samples were foods that marketed in Palu, such as salt fish, noodles, mujair fish, and tofu obtained from several places in Palu. The qualitative analysis of formalin done before measured of formalin quantitatively. The data on formalin found by UV-Vis spectrophotometer with the wavelength of 385 nm. Formalin content of salted fish, noodles, Mujair fish, and tofu were 2,005 ± 0,187ppm, 2,183 ±0,231ppm, 1,931 ±0,174 ppm, and 1,957 ±0,254 ppm, respectively.

Bahan Utama Tongkat dan Tali Tukang Sihir Fir’aun Berubah Menjadi Ular adalah Senyawa Merkuri

Arofah, Barorotul Ulfah, Firmansyah, R. Arizal, Muthohar, Sofa

Al-Kimia Vol 6, No 1 (2018): JUNE
Publisher : Study Program of Chemistry - Alauddin State Islamic University of Makassar

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Abstract

Penelitian ini membahas tentang kata ‘air raksa’ yang terdapat dalam Tafsir Al-Maraghi. Imam Musthofa Al-Maraghi memberikan penafsiran pada surat al-A’raf ayat 116 dan Thaha ayat 66 bahwa perubahan tongkat dan tali menjadi ular karena ada air raksa dan bahan kimia lainnya. Kedua ayat tersebut bercerita tentang kisah Musa dan para tukang sihir Fir’aun yang menjelaskan bahwa pada saat tukang sihir Fir’aun melemparkan tongkat dan tali, tiba-tiba terlihat merayap menyerupai ular pada surat Al-A’raf ayat 116 dan Thaha ayat 66. Mengingat Tafsir Al-Maraghi adalah kitab tafsir yang relevan dengan kemajuan ilmu pengetahuan dan teknologi, maka dalam penafsirannya seringkali memadukan dengan ilmu sains, termasuk kedua ayat tersebut. Penjelasan dari penafsiran tentang peristiwa tersebut masih sangat kurang, sehingga belum bisa dijadikan acuan. Oleh karena itu, peneliti tergugah untuk menganalisis kata ‘air raksa’ tersebut. Jika penelitian ini tidak dilakukan, maka masyarakat akan senantiasa taklid (mengikuti tanpa mengetahui dasar/kebenarannya) terhadap penafsiran al-Maraghi. Peneliti menggunakan metode pembahasan deskriptif kualitatif dan induktif dalam melakukan analisis. Artinya, selain mengumpulkan data-data primer dan sekunder, peneliti juga melakukan miniatur penelitian yang dapat menunjang data-data primer. kata ‘air raksa’ dalam penafsiran Al-Maraghi. Selain itu, juga agar kitab tafsir Al-Maraghi dapat menjadi acuan bagi semua kalangan. Setelah melakukan penelitian, ternyata penafsiran Al-Maraghi benar. Perubahan tongkat dan tali tukang sihir Fir’aun menjadi ular karena ada air raksa. Namun, air raksa tersebut dalam bentuk garam, yaitu garam merkuri (II) tiosianat (Hg(SCN)2).

The Photosensitizer from the Basic Dye Extract of the Skin Fruit of Eggplant (Solanum melongena L.)

Risnah, Indah Ayu, Aisyah, Aisyah, Iswadi, Iswadi, Saokani, Jawiana

Al-Kimia Vol 6, No 1 (2018): JUNE
Publisher : Study Program of Chemistry - Alauddin State Islamic University of Makassar

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Abstract

The latest generation of solar cell that utilizes dye from plants as a photosensitizer is Dye-Sensitized Solar Cell (DSSC). The dye from Solanum melongena L. is one of the potential photosensitizers due to its chemical and physical characteristics.  This study aims to determine these characteristics as well as its efficiency value in DSSC. The dye was obtained by ultrasonic extraction in 1% HCl methanol solution. The crude extract of dye was treated in acid and basic condition and then separated by vacuum gravitation chromatography in a way that the polarity was increased. The results were a variety of dyes according to their polarity. The dye then applied in DSSC as the photosensitizers. The highest conversion value was 0.0211%, performed by the dye in pH 8 solution. The characteristic of this extract was identified by UV-Vis, FTIR, and GC-MS. All the spectral data indicated that the main component which responsible for this efficiency was pelargonidin. 

Produksi Etil Ester Dari Minyak Dedak Padi (Oryza Sativa) Menggunakan Reaktor Ultrasonik

Aisyah, Aisyah, Riskayanti, Riskayanti, Novianty, Iin, Ilyas, Asriyani, Sjamsiah, Sjamsiah, Chadijah, Sitti

Al-Kimia Vol 6, No 1 (2018): JUNE
Publisher : Study Program of Chemistry - Alauddin State Islamic University of Makassar

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Abstract

Indonesia as the third largest grain producer in the world produces large amounts of bran. High contain Free Fatty Acid (FFA) in rice bran oil causes it can be converted into the fatty acid ethyl esters (biodiesel) by esterification and transesterification methods. The rice bran oil was obtained by rice bran extraction using n-hexane. The esterification process was catalyzed by HCl. In this study, the transesterification process to convert triglycerides into ethyl esters (biodiesel) was conducted by the addition of KOH as a neutralizer and a catalyst Oil and ethanol by ratio 1:6 using 0,5% KOH  as catalysator were reacted by utilizing 47 kHz ultrasonic wave for 45, 60 and 75 minutes. Biodiesel conversion value obtained were 49,23%; 70,55% and 52,04% respectively. Biodiesel product spectrum was analyzed using FTIR and GCMS instrument. The density, viscosity and flash point is also measured.  FTIR analysis on all variations give similar data spectrum, where the ethyl ester products are characterized by typical bands at specific frequencies such as -C=O; -C-C; -C-H (sp3) and = C-H (sp2) stretch. Based on the data from GCMS spectrum, the product components are ethyl palmitate, ethyl linoleate, ethyl stearate and ethyl oleate. 

Aktivitas Antioksidan Ekstrak Metanol Madu Cair dan Madu Bubuk Lokal Indonesia

Sumarlin, La Ode, Tjachja, Achmad, Octavia, Riana, Ernita, Nur

Al-Kimia Vol 6, No 1 (2018): JUNE
Publisher : Study Program of Chemistry - Alauddin State Islamic University of Makassar

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Abstract

Determination of antioxidant activity of methanol extract in local Indonesian liquid and powdered honey has been performed. The present study was intended to investigate the antioxidant activity and the phenolic, flavonoid, vitamin C content in methanol fraction of liquid and powdered honey. Powdered honey was produced using spray-drying technology with gum arabic as filler. Moreover, the levels of water, HMF and reducing sugar was also determined as the honey quality parameter. The result of the present research shows that powdered honey had antioxidant activity. Ekstrak Madu Kelengkeng Bubuk (EMKB) and  Ekstrak Madu Rambutan Bubuk (EMRB) had antioxidant activity with IC50 values of 5621,62± 286,55 and 10293,88 ±14,04 mg/L, respectively. The antioxidant activity of Kelengkeng (EMKB) and Rambutan (EMRB) honey increased after the change to powder form 71.19% and 49,32 %, respectively.  EMKB sample with the highest antioxidant activity has the highest total flavonoid content values (0,079±0,001 mg QE/g). The vitamin C content of the EMKB sample was 0.292 ± 0.000 mg/g, higher than the EMRB sample of 0.086 ± 0.005 mg/g. Powdered honey that produced had a decrease in water content values 50%. The water and hydroxymethyl furfural content of all sample comply with SNI 01-3545-2013, except the reducing sugar content.

Komposit Kitosan-Zeolit : Potensi Pemanfaatannnya sebagai Adsorben CO2

Ismawati, Riva, Prajoko, Setiyo

Al-Kimia Vol 6, No 1 (2018): JUNE
Publisher : Study Program of Chemistry - Alauddin State Islamic University of Makassar

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Abstract

The world has paid special attention to the increasing of CO2 concentrations in the atmosphere. In climate change issue, CO2 gas as part of greenhouse gases plays an important role in controlling earth surface temperature. Several CO2 gas capture techniques have been reported. However, information on the utilization of potential natural materials as CO2 adsorbents is still small. This study aims to determine the potential of chitosan zeolite composites as CO2 adsorbents. Various literature is used to analyze the properties of zeolites, chitosan and the potential of chitosan- zeolite composites as CO2 adsorbents. The results show the possibility of utilizing zeolite-chitosan composites as CO2 adsorbents.