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INDONESIA
Al-Kimia
Published by Universitas Islam Negeri Alauddin Makassar
ISSN : 23022736     EISSN : -     DOI : -
Core Subject : Science,
Chemistry
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.
Arjuna Subject : -
Articles 11 Documents
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Search results for , issue "Vol 7 No 1 (2019): JUNE" : 11 Documents clear
Optimisasi Produksi α-Amilase dari Saccharomycopsis fibuligera R64 dengan Response Surface Method-Central Composite Design (RSM-CCD) Agus Safari; Ahsanul Chaliqin Gayo; Saadah Diana Rachman; Muhammad Yusuf; Safri Ishmayana
Al-Kimia Vol 7 No 1 (2019): JUNE
Publisher : Study Program of Chemistry - Alauddin State Islamic University of Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24252/al-kimia.v7i1.8117

Abstract

α-Amilase (EC 3.2.1.1) is an endoamylase that hydrolyze α-1,4 glycosidic bond in amylose and amylopectin molecules yielding simpler carbohydrate. This enzyme is used to replace starch acid hydrolysis in industrial process. α-Amilase is used in many industrial processes including food, paper, bioethanol, and desizing in textile industries. This enzyme can be found in human, plants and microbes. Most industries use microbes due to their flexibility and require less space and time to culture. In the present study we use Saccharomycopsis fibuligera R64 since this yeast has high amylolytic activity and known as food borne microorganisms. Extrinsic factors are easy to manipulate in the process of enzyme production. The present study intended to determine the optimum condition for α-amylase production by S. fibuligera R64 with agitation speed, pH, and time of incubation as independent variable in the present experiment. The experiment was initiated by rejuvenation of S. fibuligera culture, design of experiment using response surface method, analysis of amylase activity, and determination of protein content. The result of the present study showed that optimum condition for amylase production using S. fibuligera R64 is at pH, agitation speed and incubation time of 3.82, 156 rpm and 49 hours, respectively. The specific activity achieved was 423.8 U/mg based on Fuwa assay.
Isolasi dan Karakterisasi Asam Humat dari Tanah Dasar Bendungan Batujai Lombok Tengah NTB Nurul Ismillayli; Dhony Hermanto
Al-Kimia Vol 7 No 1 (2019): JUNE
Publisher : Study Program of Chemistry - Alauddin State Islamic University of Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24252/al-kimia.v7i1.6274

Abstract

This study deals with the isolation and characterization of humic acids from Batujai Dam subgrade, Central Lombok. Humic acid isolated by using recommended method of the International Humic Substances Society and purified by 0.1M HCl/0.3 M HF solution. Humic acid isolated then were determined ash content, total acidity, carboxilic and phenolic group content and characterized using FTIR spectroscopy.  FTIR analyses of isolated humic acid samples have shown the presence of carboxylic, phenols, alcoholic, amines functional groups, aliphatic hydrocarbon and aromatic ring. The result of ash content determination showed that purification decreased ash content from 5.60% to 1.13%. Total acidity of humic acid was 630 cmol/kg, acidity of –COOH was 226 cmol/kg, and –OH fenolic acidity was 404  cmol/kg.
Synthesis of Nitro Ethyl Oleic from Used Cooking Oil Nasriadi Dali; Arniah Dali
Al-Kimia Vol 7 No 1 (2019): JUNE
Publisher : Study Program of Chemistry - Alauddin State Islamic University of Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24252/al-kimia.v7i1.7642

Abstract

Nitro ethyl oleic has been synthesized from used cooking oil. This study aims to synthesize nitro ethyl oleic from used cooking oil. The target compounds of nitro ethyl oleic are obtained through four stages, namely the stages of purification, esterification, transesterification, and nitration. From the purification stage of used cooking oil with sago pulp activated charcoal adsorbent is obtained fragrant and delicious pure cooking oil, yellow with water content of 0.13%, acid number 1.10 mg KOH/g fat, FFA level of 1.57%, and turbidity of 2.45 NTU. From the esterification stage was obtained methyl oleic (r = 0.887 g/cm3) and oil (triolein) in light brown with FFA level of 0.34%. From the transesterification stage was obtained ethyl oleic (83.33% acquisition) in the form of yellow liquid (r = 0.902 g/cm3), fragrant, and boiling point 77oC. From the nitration stage was obtained nitro ethyl oleic (66.67% acquisition) in the form of blackish brown liquid (r = 1.587 g/cm3), typical of biodiesel with a boiling point of 80oC.  
A Natural Dye-Sensitized from Pare (Bitter Gourd) Leaves Extracts for Dye-Sensitized Solar Cell (Dssc) Wahidah Febriya Ramadhani; Suriani S Suriani S; Aisyah A Aisyah A; Iswadi I Iswadi I
Al-Kimia Vol 7 No 1 (2019): JUNE
Publisher : Study Program of Chemistry - Alauddin State Islamic University of Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24252/al-kimia.v7i1.6309

Abstract

The availability of energy sources is dwindling so a renewable energy which has a  potential chance to be developed, such as solar panels, is needed.  The use of solar panels is still quite expensive in terms of manufacturing process. For this reason, a cheap solar panel based is developed, and it is called DSSC (Dye-Sensitized Solar Cell). The use of DSSC is developed in Indonesia, a country which is famous for its biological richness. In this study, pare leaves were used as photosensitizers obtained from the extraction process of maceration by various solvents. The DSSC test was done on four extracts including N-hexane extract, Ethyl Acetate, Methanol, and Combination of the three extracts. The highest value of efficiency obtained from each extract respectively are 0,03%, 0,04%, 0,14% and 0,30%. Characterization was done by examining the UV-Vis and FTIR spectral data. The result of UV-Vis analysis shows that wavelength for N-hexane, Ethyl Acetate, Methanol, and Combined extracts are 269,1 nm, 668,0 nm, 663,9 nm, and 6631 nm, respectively. FTIR results found that the chromophore and auxochrome groups were identified on all four tested extracts, namely; C = C, C = O, -OH, and -C-H groups.  
Analisis Sifat Fisika Kimia Tanah dan Uji Daya Hambatnya terhadap Bakteri Air Liur AnjingLiar Sjamsiah Sjamsiah; Arifuddin Arifuddin; Mashuri Masri; Sappewali Sappewali; Indah Islamiah; Hardiyanti Hamrullah; Elmika Nesti
Al-Kimia Vol 7 No 1 (2019): JUNE
Publisher : Study Program of Chemistry - Alauddin State Islamic University of Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24252/al-kimia.v7i1.7940

Abstract

This study aims to analyze the physical and chemical properties of soil from paddy fields, garden lands and city area also determine the soil inhibitory test of dog saliva bacteria. The results showed that these three soil types have different physical chemical properties and have different inhibitory zones against dog saliva bacteria. The physical chemistry of soil from paddy fields, garden lands and city area (0 cm) are as follows: for color; dark chocolate; grayish brown; and blackish ash, for texture: clay; clay; and sandy clay, for moisture content: 7.14; 6.53; 2.13. for pH close to neutral around 6.52-7.03; Total N is low (0.08-0.23); organic C compounds are classified as moderate; nutrient content of Ca/Mg is classified as moderate (9.55 /1.70 - 14.89/2.22); cation exchange capacity is classified as high (25.32-29.03) in paddy fields and gardens and compounds. The inhibitory zone of the highest dog saliva bacteria is in garden soil (3.7 cm), then paddy soil (2.86 cm) and land in the city area (1.6 cm).  
Aktivitas Sitotoksik Ekstrak Rimpang Temu Kunci (Kaempferia Pandurata) serta Pengaruhnya Terhadap Ekspresi Gen P53 dan Bcl-2 Pada Raji Cell Line Peni Lestarini; Endang Astuti; Deni Pranowo
Al-Kimia Vol 7 No 1 (2019): JUNE
Publisher : Study Program of Chemistry - Alauddin State Islamic University of Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24252/al-kimia.v7i1.6340

Abstract

Abstract Cytotoxic activity of ethanol and n-heksana extract temu kunci (Kaempferia pandurata) rhizome and its effect to p53 and bcl-2 genes expression on Raji cell line had been carried out. The rhizome of K. pandurata was drained and extracted using ethanol and n-heksana as the solvent. The ethanol and n-heksana extract were tested to Raji cell line. The p53 and bcl-2 genes expression were observed by immunocytochemistry method. The result showed that ethanol and n-heksana extract from K. Pandurata had cytotoxic activity to Raji cell line. The IC50  values for ethanol and n-heksana extract were 4.87 μg / mL and 4.14 μg / mL. The ethanol and n-heksana extract from K. Pandurata extract had capability to increase p53 gene expression and decrease bcl-2 gene expression on Raji cell line. Keywords: Kaempferia pandurata  rhizome , p53 dan bcl-2 gene expression, raji cell line
Aplikasi Mikrosimbions Spons Laut Sebagai Biomaterial Pereduksi Toksisitas Logam Berat Kromium (Cr) Ismail Marzuki; M. Iksan Ashari; Andi Asdar Marzuki; Andi Angela
Al-Kimia Vol 7 No 1 (2019): JUNE
Publisher : Study Program of Chemistry - Alauddin State Islamic University of Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24252/al-kimia.v7i1.7388

Abstract

The vulnerable marine environment is polluted by various types of heavy metals due to human and natural activities. One of the marine biota sponges can carry out heavy metal adsorption functions, so the life of the sponge must be well maintained. The application of sponge micro symbiont adsorption method aims to reduce the toxicity of chromium metal. Absorption stage: culture isolates code Sp1, Sp2, Sp3, Petrosia sponge (Strongylophore) Corticata symbionts, phenotypic and genotypic characterization, suspension symbionts were formed, interacted with 100 ppm of 1: 1 ratio chromium solution Interaction time variation 5, 10, 15, 20, 25 days, extracted. The remaining non-reduced chromium was analyzed using AAS. Observation of reduction, gas, pH, optical density parameters. The results of phenotypic characterization showed that 3 sponge symbiont isolates reacted with lactose, catalase, MR, VP and citrate. Genotypes of Pseudomonas stutzeri isolates, strain Sp1 are RCH2, Sp2 code SLG510A3-8, and Sp3 code GLB197. The reduction parameters reached a contact period of 5-15 days, the performance of the symbionts in the reduction of chromium metal toxicity in the range of 62.34 ppm to 70.47 ppm was equivalent to the reduction rate of 60.16 to 69.09% concentration.
Pengaruh Katalis NiMo Terhadap Kualitas Minyak Batubara Hasil Pencairan Tidak Langsung Rika Damayanti; Susila Arita R; Fitri Hadiah
Al-Kimia Vol 7 No 1 (2019): JUNE
Publisher : Study Program of Chemistry - Alauddin State Islamic University of Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24252/al-kimia.v7i1.6560

Abstract

Coal is a fossil energy source that is widely used as a soild fuel in many sectors. The development of indirect coal liquefaction technology is one type of technology used to convert coal into a liquid fuel product in the form of coal oil with characteristics resemble petroleum fuels. Coal oil production can be an alternative fuel source for future energy needs. In this study, the indirect liquefaction process of coal (calorific value = 6400 kcal/kg) was done in the fluidized bed reactor by heating the reactor with an electric furnace, where the process took place at temperature 350oC - 500oC and the catalyst weight was varied into 0%, 5%, 10%, and 15%. Air with a flow rate 2 LPM is flowed during the process and the lenght of the process was 60 minutes. From this research, the best characteristics of coal oil produced at a temperature of 400oC - 450oC with a catalyst weight of 15%. The characteristics of the coal oil obtained have a density of 0.852 g / cm3, specific gravity of 0.853 and oAPI gravity of 34.41. The results of GC-MS analysis was known that 46.15% of the composition of hydrocarbons in coal oil is the fraction of gasoline.
Utilization Of Guava Leaves Extract (Psidium Guajava) As Ecofriendly Corrosion Inhibitor For Iron Said Ali Akbar; Rika Ovisa; Muttakin Muttakin
Al-Kimia Vol 7 No 1 (2019): JUNE
Publisher : Study Program of Chemistry - Alauddin State Islamic University of Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24252/al-kimia.v7i1.6331

Abstract

The use of a green inhibitor from guava leaves extract as an alternative to environmentally friendly metal corrosion inhibitors has been carried out. The guava leaves extracted by 96% ethanol in the maserator for 4 days with occasional shaking and two rejuvenations. The inhibitor performance test was carried out using 2 types of water (wells and sea), as well as variations in extract concentrations of 3%, 10% and 25%. Through phytochemical testing results, it was found that the active secondary metabolite components contained in guava leaves are flavonoids, terpenoids, and tannins. Increasing the concentration of guava leaves extract in well and sea water samples, reducing the value of the corrosion rate. In seawater, the use of 25% leaves extract, there was a weight increase of nails only 0.165% of the initial weight compared with no extract which was 10.75% of the initial weight. Furthermore, the greatest inhibitor efficiency occurred at 25% extract concentration, which was 96.39% in well water media and 97.07% in sea water media. Therefore, guava leaves have the potential to be used as future green inhibitor applications.
Pemanfaatan Kompleks Polielektrolit sebagai Matriks untuk Immobilisasi Urease dan Aplikasinya sebagai Membran Biosensor Pemonitoran Hg(II) Dhony Hermanto; Mudasir Mudasir; Dwi Siswanta; Bambang Kuswandi
Al-Kimia Vol 7 No 1 (2019): JUNE
Publisher : Study Program of Chemistry - Alauddin State Islamic University of Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24252/al-kimia.v7i1.6247

Abstract

The preparation of polyelectrolyte complex (PEC) as supporting material of urease immobilisation for  Hg(II) biosensor has done. PEC membrane can be prepared by mixing hydrosol alginate and chitosan hydrosol with 1: 1 ratio at pH of 5.28 approximately. The optimum conditions and characteristics of biosensor was determined. The formed alginate–chitosan PEC membrane was confirmed by using FTIR spectroscopy and SEM analysis. The results shoed that PEC of alginate-chitosan was formed and the proposed biosensor is an excellent platform for sensitive detection of Hg (II).

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