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Al-Kimia

al-kimia
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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 238 Documents

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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

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

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).

Antimicrobial Nanocomposite Materials Based Starch and Silver Nanoparticles Ina Ristian
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.v7i1.6691

Starchs are matrix polimer with stabilization function for nanocomposite. The present study was to investigate antimicrobial activity of nanocomposite material from metal nanoparticles such as silver and matrix polimer. Silver nanoparticles (AgNPs) were succesfully synthesized by chemical reduction silver ion with trisodium citrate as reducing agent. AgNPs were Characterized by spectrofotometre UV-Vis and transmission electron microscope (TEM). Stability of nanocomposite starch/AgNPs was analized by differential scanning calorimetry (DSC). Nanocomposite starch and AgNPs (starch/AgNPs) were prepared by simple mixing with in-situ blending. Characterization of AgNPs using TEM shows that the synthesized particles have a size less than 50 nm. Starch/AgNPs nanocomposite has proven to reduce bacteria e. Coli is up to 98% and has good thermal stability. Antimicrobial nanocomposites based natural polimer are new potential materials for biomedical.

Potensi Instrumen FTIR dan GC-MS dalam Mengkarakterisasi dan Membedakan Gelatin Lemak Ayam, Itik dan Babi St Chadijah; Maswati Baharuddin; Firnanelty Firnanelty
Al-Kimia Vol 7 No 2 (2019): DECEMBER
Publisher : Study Program of Chemistry - Alauddin State Islamic University of Makassar

Penelitian ini bertujuan mengkarakterisasi gelatin tulang kaki ayam, kulit itik dan kulit babi serta membedakan profil asam lemak dari ketiga material tersebut. Metode yang digunakan: proses curing dan hidrolisis dengan variasi suhu. Hasil yang diperoleh dikarakteisasi dengan FTIR dan GC-MS. Hasil yang diperoleh menunjukkan gelatin yang dihasilkan dari tulang kaki ayam, kulit babi dan kulit itik pada suhu 80ᵒC masing-masing 2.02%; 9.33% dan 1.1%. Kadar air dari tulang kaki ayam, kulit babi, dan kulit itik yaitu 11.19%; 7.73% dan 7.7%. kadar air tersebut telah memenuhi standar kadar air SNI yaitu maksimum 16%. Hasil karakterisasi gelatin dengan FTIR menunjukkan serapan gugus fungsi yang spesifik. Pada spektrum FTIR gelatin kulit babi terdapat gugus N−H dan O−H (3433,79 cm-1), CH2 (2931,01 cm-1), C═O (1655,21 cm-1), N−H dan C-N (1544,38 cm-1), N−H (1237,39 cm-1) dan gugus C−O (1079,69 cm-1). Peak yang dihasilkan kulit babi lebih sedikit. Sedangkan GC-MS mampu membedakan komponen asam lemak babi dengan asam lemak ayam dan itik. Diperoleh hasil bahwa komposisi asam lemak utama pada lemak babi adalah asam oleat C18:1 (58,79%), stearat C18:0 (11,66%) dan palmitat C16:0 (11,44%). Komponen asam lemak utama pada lemak babi murni secara keseluruhan memiliki asam arakidonat dan asam eikosenat yang tidak terdeteksi pada lemak lain.

Extraction, Isolation, Characterisation and Antioxidant Activity Assay of Catechin Gambir (Uncaria gambir (Hunter). Roxb Edin Ningsih; Sri Rahayuningsih
Al-Kimia Vol 7 No 2 (2019): DECEMBER
Publisher : Study Program of Chemistry - Alauddin State Islamic University of Makassar

Catechins are one of polyphenol compounds which reported have antioxidant properties. This study aims to extraction, isolation, characterization, and determine the antioxidant activity of catechin compounds from gambier powder(Uncaria gambir (Hunter). The extraction method used was maceration extraction with three types of solvents (70% ethanol, 70% methanol, and ethyl acetate). The process of purifying catechins is carried out with water, ethyl acetat, and n-hexane. Catechins were characterized by FTIR (Fourier Transform Infra Red) and UV-Vis spectrophotometer and tested for antioxidant activity using the DPPH (2.2 Difenyl -1-Pikrilhidrazil) method. The results showed that the extracted gambier using 70% ethanol solvent resulted in more catechins (51.20 g) than the 70% methanol solvent (40.35 g) and ethyl acetate (16.40 g). Characterization of catechin using UV-Vis spectrophotometer showed that purity content of catechins obtained from the extract ethanol 70% had purity 70.76%, methanol 70% 70.86%, and ethyl acetate 70.35%. Analysis using FTIR showed catechin has functional groups such as hydroxy (-OH), vibration C = C alkene, C-H, CH2 and C-O, so that the compound isolated has the basic structure of the catechin. The result of antioxidant activity from showed IC50 value are 2.72 ppm; 3.04 ppm and 3.06 ppm for extract catechin of etanol 70%, methanol 70% and ethyl acetate, so that can be said that catechins have antioxidant activity levels in a very strong category.

Kajian Kinetika Pengaruh Lama Penyimpanan Terhadap Kadar Vitamin C Pada Buah Apel Malang (Malus Sylvestris) Anjar Purba Asmara; Hanik Khuriana Amungkasi
Al-Kimia Vol 7 No 2 (2019): DECEMBER
Publisher : Study Program of Chemistry - Alauddin State Islamic University of Makassar

An analysis for determining kinetics of effect of varied shelf-life time to the level of vitamin C in Malus sylvestris fruits has been conducted. It has used fresh apple Malang (M. sylvestris) from Batu (East Java) at their harvest time with the same size and color as the subject of the research. Therefore, the fruits were stored in room temperature and kept away from direct sunlight for 0, 1, 2, and 3 days. The fruits were extracted by using a juice blending technique with aquadest as the solvent. An iodimetric titration has been used to determine the effect of the varied storage time to the level of vitamin C in the samples. The result shows that the average value of vitamin C level in M. sylvestris stored in 0, 1, 2, and 3 days as much as 2.3904 mg/50g; 2.1073 mg/50g; 2.06695 mg/50g; and 1.9860 mg/50g, respectively. Statistic analysis of ANAVA-A and t-test confirms that there are significant differences between the level of vitamin C of M. sylvestris stored in 0, 1, 2, and 3 days. The conclusion about the kinetics of ascorbic acid degradation of M. sylvestris at 27 0C states three expressions as following as: the reaction is a second order reaction, the constants of reaction rate is 2.65 x 10-2 L(mol.days)-1, the half life is 15.786 days, and kinetics model for the reaction is C = (0.0265t + 1/C0)-1.

Synthesis and Characterization of UiO-66 as a Paracetamol Absorption Material Fery Eko Pujiono; Try Ana Mulyati
Al-Kimia Vol 7 No 2 (2019): DECEMBER
Publisher : Study Program of Chemistry - Alauddin State Islamic University of Makassar

UiO-66 synthesis has been carried out by dissolving 0.53 grams of zirconium tetrachloride (ZrCl4) and 0.34 grams of Benzene-1,4-dicarboxylic Acid (H2BDC) in 30 mL Dimethylformamide (DMF). The solution is then distilled for 30 minutes and then heated in an oven at 140 ° C for 6 hours. The UiO-66 material produced was then characterized by an X-Ray Diffractometer (XRD) and Fourier Transform Infrared (FTIR). The results showed that the UiO-66 was successfully synthesized which supported the XRD results at 2θ 7.3o, 8.49o and 25.8o which were the peak characteristics of UiO-66. In addition, the FTIR results show a peak of around 1500 cm-1 showing vibrations of C = C on the benzene ring and a peak of about 1390 cm-1 indicating streching of O-C-O produced from the ligand. The peaks are around 750, and 660 cm-1 which indicates the presence of C-H vibrations from the ligand. UiO-66 was also approved as the adsorption agent of paracetamol which was approved with the highest adsorption of paracetamol at 72 hours immersion time which was 97.03%.

Studi In Silico: Prediksi Potensi 6-shogaol dalam Zingiber officinale sebagai Inhibitor JNK Sri Sulystyaningsih Natalia Daeng Tiring; Yohanes Bare; Andri Maulidi; Mansur S; Fitra Arya Dwi Nugraha
Al-Kimia Vol 7 No 2 (2019): DECEMBER
Publisher : Study Program of Chemistry - Alauddin State Islamic University of Makassar

Type 2 Diabetes Mellitus (T2DM) is a metabolic disease characterized by hyperglycemia and insulin resistance. T2DM therapy against c-Jun N-terminal kinase (JNK) is one of the recovery solutions using bioactive compounds from ginger. 6-shogaol is bioactive compounds of ginger that has antioxidant properties. The purpose of this study is to analyze the potential of 6-shogaol as a JNK inhibitor. JNK protein (ID: 464Y) was obtained from Protein Data Bank (PDB) through 6-shogaol ligand (CID: 5281794) obtained from the PubChem database. Protein docking protein and ligand use Hex 8.0.0 software while visualization and analysis using Discovery Studio client 4.0. The results showed that 6-shogaol was predicted to have potential as a JNK inhibitor. Proving this by finding five amino acid residues (TRY223, LEU210, THR103 ALA214, ARG107) with an energy of -236.29cal/mol. We found the type of hydrogen bonds and the van der waals forces formed. The interaction of ligand and protein successfully inactivates JNK and stops pancreatic β cell dysfunction. 6-shogaol has pharmacological properties as a JNK,T2DM.

Pengaruh Konsentrasi Tembaga dan Rapat Arus terhadap Morfologi Endapan Elektrodeposisi Tembaga Soleh Wahyudi; Syoni Soepriyanto; Mohammad Zaki Mubarok; Sutarno Sutarno
Al-Kimia Vol 7 No 2 (2019): DECEMBER
Publisher : Study Program of Chemistry - Alauddin State Islamic University of Makassar

Copper deposits have been obtained by the electrolysis method using copper sulfate and sulfuric acid. The effect of copper concentration and current density on the surface morphology of copper deposits and current efficiency have been studied. The variation of copper concentration is 0.04 M and 0.8 M and the variation of current density is 2-8 A/dm2. The copper deposits will be photographed macro, weighed and characterized by Scanning Electron Microscope (SEM) to determine the surface morphology of deposits and Energy-Dispersive X-ray spectroscopy (EDX) to determine the chemical composition of deposits. The surface morphology of copper deposits in the form of compact and without nodules was reached at copper concentration is 0.8 M and the current density is 2 A/dm2 with the average of current efficiency is 96%.

Pengaruh Karaginan dari Rumput Laut Merah (Eucheuma cottonii) Asal Provinsi Aceh sebagai Edible Coating terhadap Ketahanan Buah Reni Silvia Nasution; Husnawati Yahya; Muhammad Ridwan Harahap
Al-Kimia Vol 7 No 2 (2019): DECEMBER
Publisher : Study Program of Chemistry - Alauddin State Islamic University of Makassar

The coating substance on tomato, apple, and kiwi from carrageenan of Eucheuma cottonii that originated from Aceh was made with additional PEG (polyethylene glycol) plasticizer to increase the fruit shelf life. Carrageenan of Eucheuma cottonii was extracted using 14% alkaline solution (KOH) and precipitated using IPA (isopropyl alcohol). The coating substance was made using various combination of carrageenan (0,1%, 0,2% 0,3%) and PEG (polyethylene glycol) with concentration 0,5% (v/v). Fruit coating process was carried out by immersion until the whole fruit well submerge. The examination was carried out through functional groups identification of carrageenan from Eucheuma cottonii and the coating substance. The coating substance was observed toward fruits resistance to see changes in physical shape and hardness of fruit and used a microscope with 450 times enlargement to observe the fruit surface at 0 day, 6th day, 12th day and 18th day. As the result, carrageenan that extracted from red seaweed (Eucheuma cottonii) shown the suitable structure with the commercial carrageenan. From the observation result, coated fruits resistance which was observed at 12th day shown apple and tomato have a better hardness and physical appearance with 0,3% carrageenan than with 0,1%, 0,2%, and control, meanwhile for kiwi with 0,2% carrageenan.

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