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Department of Chemistry Faculty of Mathematics and Natural Sciences Universitas Andalas Kampus Universitas Andalas Limau Manih Padang 25163
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INDONESIA
Jurnal Riset Kimia
Published by Universitas Andalas
ISSN : 1978628X     EISSN : 24768960     DOI : -
Core Subject : Science,
Chemistry
Arjuna Subject : -
Articles 12 Documents
 1   2 
Search results for , issue "Vol 13, No 1 (2022): March" : 12 Documents clear
Penentuan Kandungan Antioksidan Total pada Infusa Selada Hijau (Lactuca sativa L.) Hidroponik dan Konvensional secara Spektrofotometri dengan Modified Phenantroline Method (MPM) Yefrida, Yefrida; Refilda, Refilda; Hamidah, Nofi; Rosman, Widuri
Jurnal Riset Kimia Vol 13, No 1 (2022): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v13i1.492

Abstract

Green lettuce is a vegetable that is widely consumed in Indonesia. These vegetables come from conventional and hydroponic farming. This study aims to compare the antioxidant content of these two types of vegetables. This vegetable is extracted by the infundation method. The extract obtained was determined for its antioxidant content by the MPM method. This method was validated by using parameter LoD, LoQ, linearity, precision and accuracy. The results showed that this method was valid for determining the total antioxidant content in conventional and hydroponic green lettuce samples. The total antioxidant content in conventional and hydroponic green lettuce samples was 2.68 ± 0.65 mg aa/g FW and 1.67 ± 0.40 mg AA/g FW, respectively. T test stated that the antioxidant content of the two samples was significantly different.
Black Water Purification by Activated Carbon from Ilalang Weeds (Imperata cylindrica) Adsorbent in Peatland Rural Area Ngatijo, Ngatijo; Heriyanti, Heriyanti; Putri, Winda Arinda; Irunsah, Aslan; Ishartono, Bayu; Basuki, Rahmat
Jurnal Riset Kimia Vol 13, No 1 (2022): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v13i1.449

Abstract

The black water containing humic acid, HA in peat land rural area is a serious issue. This study aims to synthesis of activated carbon, AC from Ilalang Weeds, IW (Imperata cylindrica) as low-cost adsorbent for HA. The success AC synthesis by H3PO4 activator from IW was evidently characterized by Fourier Transform Infra-Red, FTIR and Scanning Electron Microscopy, SEM. The effects of pH solution, initial HA concentration, and contact time were systematically studied to investigate the performance of Activated Carbon from Ilalang Weeds, ACIW. The results showed the increasing of Langmuir monolayer capacity of HA adsorption on carbon from IW before (49.75 mg g-1) and after (56.82 mg g-1) activation process at the pH optimum 6.0. The equilibrium adsorption data fitted with the isotherm model was shifted from multilayer Freundlich model (CIW) into monolayer Langmuir model as the consequences of increasing pore diameter size and active sites intensity. Calculation of adsorption energy by Dubinin-Radushkevich (EDR) model, 0.50 and 2.24 kJ mol-1 for CIW and ACIW, respectively, showed the increasing of physical affinity of HA with the active sites of adsorbent. Adsorption kinetics showed that the adsorption behavior followed the Ho pseudo-second-order kinetic model. The experimental results of this work demonstrate that the ACIW can be used as a promising low-cost adsorbent for HA removal for clean water production in peat land rural area. 
Ekstrak Kafein sebagai Inhibitor Korosi Alami pada Logam Aluminium dalam Media Larutan Asam Sulfat dan Biosolar Marinda Sukmawanta, Shafara Najla; Wulan, Dyah Ratna; Widjajanti, Kristina; Azkiya, Noor Isnaini; Maryanty, Yanty
Jurnal Riset Kimia Vol 13, No 1 (2022): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v13i1.488

Abstract

This research, the caffeine extract of arabica coffee beans, cacao beans, and black tea leaves will be tested as a corrosion inhibitor on aluminium in an acidic environment and in biodiesel containing acid. This condition resembles the metabolism of microorganisms in biodiesel which produces H2SO4 as one of the causes of corrosion. Arabica coffee, cacao beans and black tea are natural organic ingredients containing caffeine which can inhibit corrosion. In the maceration process used a variable ratio of 70% ethanol solvent with organic matter, namely 225 grams of organic matter with 450 grams of ethanol and 150 grams of organic matter with 450 grams of ethanol. Concentration of caffeine extract from arabika coffee, cacao beans, and black tea leaves was obtained based on HPLC analysis at an effluent rate of 0.8 mL/min. The corrosion inhibition efficiency test on aluminium was observed at 0, 1, 4, 7 and 10 days of immersion. The previously used aluminium has been corroded with 12% H2SO4. The corrosion inhibition efficiency test on aluminium was observed at 0, 1, 4, 7 and 10 days of immersion. The best inhibitor results on aluminium soaked in biosolar containing 12% H2SO4 is tea 1.234,313 ppm with a corrosion rate of 1.6x10-4 g/cm2 day on day 1 to 2.5x10-4 g/ cm2 day on day 10 with an inhibition efficiency of 99%. While the aluminium soaked in H2SO4 12% is tea containing caffeine of 684.373 ppm with a corrosion rate of 1.3 x10-4 g/ cm2 day on day 1 to 3.3x10-4 g/ cm2 day on day 10 with an inhibition efficiency of 64%. The longer the immersion time of aluminium in H2SO4 media with the addition of organic inhibitors, the lower the corrosion rate value because the inhibitors form a layer that protects the aluminium.
Struktur, Sifat Dielektrik dan Optik Senyawa Aurivillius (Ca0,5Ba0,5)Bi4Ti4O15 yang Disintesis dengan Teknik Lelehan Garam Veronita, Silvi; Septiani, Upita; Zulhadjri, Zulhadjri
Jurnal Riset Kimia Vol 13, No 1 (2022): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v13i1.463

Abstract

Synthesis of ferroelectric material based onAurivillius phases, (Ca0.5Ba0.5)Bi4Ti4O15 (CBBT), have been done using a molten salts technique.The results of X-ray diffraction (XRD) analysis showed the characteristic peaks at 2θ = 12.93°, 17.31°, 21.64°, 23.23°, 27.71°, 30.33°, and 32.90° which was correspond to the four-layers of Aurivillius phase.Refinement structure using the Le Bail method, the sample is suitable for orthorhombic structures with the A21am space group. The orthorhombicity of the CBBT is small and nearer to tetragonal symmetry.Fourier Transform Infra-red (FTIR) spectra show distortion of TiO6 octahedral at 847 cm-1 and strain vibrations of TiO6 octahedra at 545 cm-1 due to A-O bonds.Analysis using Scanning Electron Microscopy (SEM) shows the morphology of the sample in the form of plate-like which is characteristic of Aurivillius phase.The ferroelectric to paraelectric phase transition temperature (Tc) was obtained at 635ºC.The band gap value of the CBBT compound was 3.17 eV, relatively the same with the CaBi4Ti4O15 (CBT) compound.
Penentuan Profil Metabolit Sekunder, Aktivitas Antioksidan dan Antibakteri dari Ekstrak Biji Kurma (Phoenix dactylifera L.) Bebas Lipid Afrizal, Afrizal; Perdana, Aditya; Suryati, Suryati
Jurnal Riset Kimia Vol 13, No 1 (2022): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v13i1.423

Abstract

Dates are one of the plants that grow in the Middle East, one of them is the Golden Valley variety. Dates are usually consumed directly and can also be processed into date juice drinks. Dates refined process would produce waste in the form of date seeds are discarded and not processed into other products. This study used lipid-free Golden valley date seed extract to determine the secondary metabolite profile by using LC-MS/MS method, determining phenolic content using the Folin-Ciocalteau method, determining total flavonoids using the aluminium chloride method, determining antioxidant activity by DPPH method, and determination of antibacterial activity by the disc diffusion method. The results showed that the compounds identified from the lipid-free date seed extract were catechin-(4α→8)-catechin, bis((1S,2R,5S)-5-isopropyl-2,3-dimethylcyclo-hexyl)-2,6-dimethylpyridine-3,5-dicarboxylate, 3,5,6-trihydroxy-4',7-dimethoxyflavone, ethyl-2-amino-3-oxobutanoate, and bis(2-isopropyl-5-methylcyclohexyl)-2,6-dimethyl-1,4-dihydro-3,5-pyridine dicarboxylate. Lipid-free date seed extract contains total phenolic and flavonoid totals of 4364.704 mgGAE/100 grams of dried extract and 17200 mgQE/100 grams of dried extract. Its antioxidant activity is very strong in counteracting DPPH free radicals indicated by IC50 value of 10.1951 mg/L. Antibacterial activity shows strong inhibition of Staphylococcus aureus bacteria compared to inhibition of Escherichia coli bacteria that are categorized as weak.
Hidrogel Superabsorben Berbasis Natrium Alginat-Bentonit sebagai Pelapis Pupuk Lepas Lambat Lestari, Sintia; Yuningsih, Lela Mukmilah; Muharam, Salih
Jurnal Riset Kimia Vol 13, No 1 (2022): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v13i1.464

Abstract

The application of slow-release fertilizer in agriculture is currently very necessary because of its performance that can control the release of fertilizer. However, the case of excessive use of urea on agricultural land has the potential to cause water pollution because the process of nitrification produces nitrite ions that are toxic and eutrophication of water and prevent harmful N2O gas emissions. This research has been done making urea slow-release fertilizer in the form of superabsorbent hydrogel with crosslink method and bentonite coating technique by sodium alginate. The hydrogels formed characterized its structure and morphology with FTIR and SEM-EDS, as well as swelling tests to see its ability to store water. Furthermore, to test the performance of hydrogel as a slow-release fertilizer is carried out urea release test at various pH and times. The results showed that urea fertilizer has filled the structure and surface of hydrogel with a swelling ratio of 2.894,30% (BAC1) and 3.428,52% (BAC2). The addition of CaCl2 crosslinking agent provides increased gelation power, swelling, and adsorption capacity against urea in addition to the urea release process is not affected by pH.
Identifikasi Aktivitas Biologis, Prediksi Toksisitas, dan Molecular Docking Senyawa Jubanine dari Tanaman Bidara Arab sebagai Kandidat Antivirus SARS-CoV-2 Fakih, Taufik Muhammad; Putri, Nawang Wulan Rachmatillah Prastowo; Marillia, Viola; Ramadhan, Dwi Syah Fitra; Darusman, Fitrianti
Jurnal Riset Kimia Vol 13, No 1 (2022): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v13i1.437

Abstract

Coronavirus disease (COVID-19) is a disease of the respiratory tract caused by the coronavirus (SARS-CoV-2). Jubanine A, jubanine B, jubanine C, jubanine G, and jubanine H compounds in the arabian bidara plant (Ziziphus spina-christi L.) are known to treat viral and bacterial infections. The purpose of this study was to test the affinity of the compounds jubanine A, jubanine B, jubanine C, jubanine G, and jubanine H in the arabian bidara plant to the non-structural protein 15 (Nsp15) receptor. This research was carried out by identifying the physicochemical properties of the test compounds using the swissADME server. After that, geometry optimization was performed using the Quantum ESPRESSO 6.6 software, then macromolecule preparation was accomplished using the BIOVIA Discovery Studio 2020 software. Furthermore, method validation and molecular docking simulations were demonstrated using MGLTools 1.5.6 software with AutoDock Tools 4.2. Then the analysis of the molecular docking results was carried out using the BIOVIA Discovery Studio 2020 software. Finally, the toxicity of the test compound was predicted using the Toxtree 3.1.0 software. Based on the results of free binding energy (∆G), jubanine H has the best affinity among the other five compounds with the lowest binding energy value of −6.51 kcal/mol.
Validation and Uncertainty Evaluation of an LC-DAD Method for Simultaneous Quantification of Benzoic Acid, Methylparaben, and N-Butylparaben in Soy Sauce Aristiawan, Yosi; Ramadhaningtyas, Dillani Putri; Styarini, Dyah
Jurnal Riset Kimia Vol 13, No 1 (2022): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v13i1.432

Abstract

Chemical food preservation is the common strategy used by human to preserve the natural properties and to increase the shelf life of food. Although preservatives are useful to keep the food fresh and to stop the bacterial growth, there are certain preservatives that are harmful if taken in more than the prescribed limits. Some of the typical used—benzoic acid, methylparaben, and n-butylparaben—were employed in this work with the aim of establishing a simultaneous liquid chromatography (LC) method for detecting each in soy sauce matrices. Liquid and C18 solid phase extraction were performed in this procedure prior to LC using Diode Array Detector analysis. In gradient elution of a format buffer (pH 4.4) and acidified acetonitrile, the target components were successfully separated. Calibration curve ranged from 0.61–140 mg/kg linearly while the limit of quantification for benzoic acid, methylparaben, and n-butylparaben were 0.41, 0.10, and 0.11 mg/kg, respectively. The intermediate precision and recovery were in the range between 0.15-1.89% and 100.5-103.3%, respectively. The expanded uncertainty (k=2) in sample measurement was estimated at 3.4-6.5%. The offered method was conformed to the validation acceptance criteria and can be applied as a routine method in the laboratory at ppm level.
Synthesis of 4-(5-(2,3-Dimenthoxyphenyl)-3-(4-Methoxyphenyl)-4,5-Dihydro-1H-Pyrazol-1-y1) Benzenesulfonamide as a Promosing Tyrosinase Inhibitor Candidate Rahayu, Rahayu; Herfindo, Noval; Oscifiani, Nelly; Frimayanti, Neni; zamri, Adel
Jurnal Riset Kimia Vol 13, No 1 (2022): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v13i1.486

Abstract

In this study, titled compound 5 has been successfully synthesized with 93% yield. The pyrazoline compound was obtained from the cyclocondensation reaction of 4-hydrazinylbenzenesulfonamide 3 with chalcone (E)-3-(2,3-dimethoxyphenyl)-1-(4-methoxyphenyl)prop-2-en-1-one 4 under basic conditions. The molecular structure was confirmed through analysis of FTIR, NMR and HRMS spectroscopic data. Furthermore, its tyrosinase enzyme inhibitory activity was determined through in vitro assay against tyrosinase of Agaricus bisporus. However, the pyrazoline compound 5 showed lower inhibitory activity than the positive control, kojic acid, whereas the IC50 value of the compound 5 is higher than that of kojic acid. The compound 5 IC50 value was 262.15 µM, while kojic acid IC50 value was 88.52 µM.
Sintesis Senyawa-Senyawa Epoksi dari Asam Lemak Minyak Nyamplung (Calophyllum inophyllum L.) Murniati, Murniati; Gunawan, Erin Ryantin; Suhendra, Dedy; Asnawati, Dina -; Qurba, Pujana
Jurnal Riset Kimia Vol 13, No 1 (2022): March
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v13i1.447

Abstract

Epoxidation is a reaction of a carbon double bond with active oxygen, which results in the addition of an oxygen atom, converting the original double bond into a three-membered epoxide (oxirane) ring. Generally, the raw material for making epoxy comes from petroleum. Nyamplung kernel oil is a non-edible oil that can be used as an alternative raw material for making epoxy derivatives. The purpose of this study was to determine the optimum conditions and characterization of epoxy materials. The fatty acids of Nyamplung kernel oil were reacted formic acid and hydrogen peroxide with sulfuric acid as a catalyst. The optimum condition of the following parameters on the study of this process was investigated: the epoxidation time, temperature, and the mole ratio of formic acid and hydrogen peroxide. The results showed that the optimum reaction conditions with the temperature was 65 oC, the mole ratio of formic acid and hydrogen peroxide was 1:6, and the reaction time was 75 minutes. The results of the characterization under optimum conditions showed the oxirane value of 1.69, the iodine number of 9.63 mg iod/100 g, and the epoxy conversion of 67.6 %. The results of FTIR characterization showed absorption at a wavenumber of 820.03 cm-1 which is a specific absorption from the oxirane ring of the epoxy compound.

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