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Jurnal Kimia Unand
Published by Universitas Andalas
ISSN : 23033401     EISSN : 30262933     DOI : -
Core Subject : Science, Engineering,
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Energy Materials Science & Nanotechnology
Jurnal Kimia Unand has been registered with the number online ISSN: 3026-2933 and printed ISSN: 2303-3401. Jurnal Kimia Unand is a peer-reviewed journal published by the Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Andalas, Sumatera Barat, Indonesia. This journal is devoted to publishing original contributions on chemistry, applied chemistry, chemical engineering, and materials science, both theoretical and experimental studies. Among the research areas of interest are inorganic and organic, especially in developing materials with novel and/or valuable properties. Initially, J. Kim. Unand published articles in 2012, Volume 1. Number 1. November 2012 with a printed ISSN;2303-3401. This journal publishes 4 issues in 1 year and does not yet have an online journal system in the publishing process. This journal aims to publish the articles of undergraduate students of the Chemistry Department, Faculty of Mathematics and Natural Sciences, Andalas University, as one of the graduation requirements. In 2022, J. Kim. Unand initiated using OJS with an online ISSN, and the publishing frequency is two issues per year, in May and October. The criteria of the submitted article cover the following types of articles as follows: Communications. Research articles. Review articles. The scope of this journal includes: Organic synthesis and natural product chemistry Materials synthesis and characterization Synthesis of organic and inorganic compounds Theoretical and computational chemistry Fabrication, development, and validation of analytical methods Food and medicinal chemistry
Arjuna Subject : Kimia(semua kategori) - Kimia (Lain-Lain)
Articles 41 Documents
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Analisis Kandungan Formalin dan Boraks dalam Mi Kuning, Kerupuk Merah, dan Ayam Menggunakan Metode Rapid Test Kit dan Spektrofotometri UV-Vis Syafriani, Yolanda Febrica; Anis, Mhd.; Kartika, Irma Ratna; Kurniadewi, Fera
Jurnal Kimia Unand Vol. 13 No. 1 (2024): May 2024
Publisher : Departemen Kimia Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jku.13.1.1-6.2024

Abstract

Food is one of human’s primary needs to survive and carry out their activities. Food must be safe, nutritious, and high quality when it’s consumed. In order to maintain food quality, some food ingredients, such as yellow noodles, crackers, and chicken, are often added with formaldehyde and borax, which are dangerous ingredients that are prohibited use as Food Additives (BTP) because their health hazards in accordance with Regulation of Minister Health No. 033 of 2012 and Regulation of BPOM No. 22 of 2023. Therefore, this research aims to identify qualitatively and determine the formaldehyde and borax levels quantitatively in yellow noodles, red crackers, and chicken as an effort to ensure the food safety. The method used in qualitative analysis is a rapid test kit and quantitative is UV-Vis spectrophotometry at a wavelength of 412 nm for formaldehyde and 551 nm for borax. The results of the qualitative analysis test showed that the yellow noodle sample contained formaldehyde and borax as indicated by the color change of the test stick to purple and red, respectively. Meanwhile, according to quantitative analysis, yellow noodles also contained formaldehyde and borax with average levels of 479.09 mg/kg and 44.43 mg/kg, respectively. Red crackers and chicken samples are free from formaldehyde and borax content.
Efek Temperatur dan Waktu Terhadap Total Kandungan Antioksida Dari 5 Jenis Tanaman Herbal dengan Metode Phenanthroline Termodifikasi Arman, Etriyanto; Yefrida, Y.; Refinel, R.
Jurnal Kimia Unand Vol. 12 No. 2 (2023): November 2023
Publisher : Departemen Kimia Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jku.12.2.27-32.2023

Abstract

This research determines the effect of temperature, maceration time, extract storage time at room temperature and refrigerator temperature of the total antioxidant content in miana leaves (Plectranthus scutellarioides (L.)R. Br), papaya leaves (Carica papaya), rambutan leaves (Nephelium lappaceum), bay leaves (Eugenia polyantha) and green betel leaves (Piper betel L). The determination of total antioxidant content was carried out by modified phenanthroline method. Based on the research data. It was found that the optimum conditions for total antioxidant content in the samples above were at 100oC with 60 minutes of maceration time and without storage time of the extracted samples before being analyzed. The total antioxidant content of miana leaves, papaya leaves, rambutan leaves, bay leaves, and green betel leaves analyzed in the optimum conditions are 3.0865; 1.1554; 0.4641; 0.6764; and 3.3630 mmol Fe/g DW, respectively.
Penanggulangan Limbah Ubi Kayu dengan Menggunakan Katalis TiO2/Zeolit Alam Clinoptilolit-Ca secara Sinergi Fotokatalis dan Adsorpsi Zilfa, Z.; Yusuf, Yulizar; Putri, Alsa Sepia
Jurnal Kimia Unand Vol. 13 No. 1 (2024): May 2024
Publisher : Departemen Kimia Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jku.13.1.14-21.2024

Abstract

Cassava waste containing cyanogenic glycosides is very dangerous for the environment because there is cyanide bound to organic compounds. Cyanide bound to organic compounds is degraded by photolysis using TiO2 catalyst/Clinoptilolite-Ca natural zeolite to break the bond between HCN and organic compounds so that it is no longer harmful to the environment, besides that cassava waste also contains suspended solids and organic compounds that affect water quality, resulting in high COD, BOD, TOC, and TSS values in waters. Therefore, the values of COD, BOD, TOC, and TSS were determined before and after degradation. In addition, the effect of time, mass, and type of catalyst (TiO2, Zeolite, and TiO2/Zeolite) on the percentage of cassava waste degradation was also determined. CN- analysis was performed with a UV-VIS spectrophotometer, where maximum absorption occurred at a wavelength of 573 nm. The optimum time of degradation without catalyst is 75 minutes with a degradation percentage of 20.52%, the optimum mass of TiO2/Zeolite catalyst is 0.8 grams with a degradation percentage of 79.97% at 60 minutes, the percentage of degradation using 0.03 grams of TiO2 is 58.65% at 75 minutes, the percentage of degradation using 0.77 zeolite is 35.43% at 75 minutes. COD value before degradation 1406 mg/L and after degradation 465 mg/L. BOD value before degradation 226 mg/L and after degradation 95.4 mg/L. TSS value before degradation 400 mg/L and after degradation 220 mg/L. While the TOC value before degradation was 546 mg/L and after degradation was 670 mg/L. FTIR analysis of cassava waste shows a peak shift indicating degradation, the 750-1000 cm-1 and 1250-1500 cm-1. While the characterization of the TiO2/zeolite catalyst in FTIR and XRD showed no change in the structure of the TiO2/zeolite catalyst before and after degradation.    
Perlindungan Baja Ringan Dalam Medium Asam Klorida Menggunakan Ekstrak Daun Sungkai (Peronema canescens Jack) Stiadi, Yeni; Emriadi; Rahmayeni; Yolanda, Putri; Della Rosalynna S.
Jurnal Kimia Unand Vol. 13 No. 1 (2024): May 2024
Publisher : Departemen Kimia Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jku.13.1.22-30.2024

Abstract

Corrosion inhibition of mild steel in 1 M hydrochloric acid (HCl) by leaves extract of sungkai (Peronema canescens Jack) was studied by weight loss method, Fourier Transform Infra-Red (FTIR), spectroscopy UV-Vis, and optical microscopy. The corrosion rate of mild steel increase with the increase of temperature and decrease with the increase of concentration from leaves extract of sungkai in medium. The weight loss method shows that the inhibition efficiency increased with concentration and increases with temperature increase. The highest inhibition efficiency was 90.70% with the addition of 10 g/L extracts at 60ºC. The adsorption of the inhibitor on the surface of mild steel follows the Langmuir adsorption isotherm because it forms a monolayer. Analysis of FTIR and UV-vis spectroscopy showed an interaction between leaves extract of sungkai and mild steel surface. Optical microscopy analysis revealed differences in the surface of mild steel immersed in 1 M HCl medium with and without the addition of extract.  
Penentuan Kandungan Metabolit Sekunder, Fenolik Total serta Uji Aktivitas Antibakteri dan Antijamur Ekstrak Daun Sungkai (Peronema canescens Jack) di Kabupaten Agam dan Kota Padang -, Norman Ferdinal; Ningsih, Yanisa Fitria; Afrizal, Afrizal
Jurnal Kimia Unand Vol. 13 No. 1 (2024): May 2024
Publisher : Departemen Kimia Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jku.13.1.31-39.2024

Abstract

Sungkai (Peronema canescens Jack) is the traditional medicinal plants used in Indonesia. The purpose of this study was to determine the content of secondary metabolites, total phenolic content and test the antibacterial and antifungal activity of Sungkai plant leaf extract. Extraction was carried out by gradual maceration using 3 solvents with different polarity, starting from hexane, ethyl acetate and methanol. The results showed that the phytochemical profile of Sungkai leaves contained flavonoids, phenolics, saponins, triterpenoids, steroids and alkaloids. In the total phenolic test using the Folin-Ciocalteau method. The highest total phenolic content was found in the methanol extract of 195.8 mgGAE/g sample for the Padang City. The antibacterial and antifungal activity of Sungkai leaf extract were tested using the Well diffusion method. The largest diameter of the clear zone on antibacterial activity was produced in the ethyl acetate extract of the Kab. Agam with a concentration of 50% is 7 mm in Escherichia coli bacteria and 5.6 mm in Staphylococcus aureus bacteria. The highest antifungal activity against Candida albicans was produced in the ethyl acetate extract of the Padang City area of ​​6.4 mm. The ability of the extract activity is still much lower when compared to the positive control
Sintesis Lapis Empat Fasa Aurivillius Ca1-xBaxBi3,5La0,5Ti4O15 Dengan Metode Lelehan Garam Zulhadjri; Silpa , Riga Oktry; Rahmayeni; Pratiwi, Nurul
Jurnal Kimia Unand Vol. 13 No. 1 (2024): May 2024
Publisher : Departemen Kimia Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jku.13.1.7-13.2024

Abstract

The four-layer Aurivillius phase Ca1-xBaxBi3.5La0.5Ti4O15 (x = 0.2, 0.4, 0.6, 0.8, and 1) has been synthesized by molten salt method. The effect of varying x on the structure, morphology, and dielectric properties was studied. X-ray diffraction (XRD) and Le Bail refinement revealed that the compounds with the composition x = 0, 0.2, and 0.4 were single-phase product with orthorhombic A21am structure, whereas for higher x value (composition of Ba doped), a Ba2TiO4 impurity is found in products. Changes in unit cell volume were investigated, and the size increased with larger x. The substitution of larger Ba2+ ions resulted in a shorter Ti-O bond, shifting vibration mode to higher wave number that showed in FTIR spectra. SEM images show anisotropic plate-like grain with distributed particle sizes at 1.9 – 3.1μm. The dielectric constant values decrease with increasing x, otherwise the dielectric loss values increase for x = 0 and 0.2, however decrease for x = 0.4. The resulting Aurivillius compound has potential for applications in ferroelectric and piezoelectric devices.
Transpor Ion Logam Cu(II) Menggunakan Minyak Kelapa (Cocos nucifera L.) Sebagai Membran Cair Melalui Teknik Membran Cair Fasa Ruah Refinel; Olly Norita, Tetra; Shofiyah , Anwar
Jurnal Kimia Unand Vol. 13 No. 2 (2024): November 2024
Publisher : Departemen Kimia Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jku.13.2.1-7.2024

Abstract

Increasing industrial activities throughout the world produce a large amount of waste, including materials that contain heavy metal ions. One of the heavy metals found in industrial waste is copper ion Cu(II). Liquid membrane technology using vegetable oil as the membrane phase can be an environmentally friendly alternative metal transportation process. Transport of Cu(II) ions was carried out using bulk li-quid membrane technology using coconut oil as the phase membrane. According to the Minister of Health Regulation No. 492/menkes/per/IV/2010 concerning Drinking Water Quality Requirements, the threshold limit of Cu(II) ions in waters is 2 mg/L. Many ways have been done to separate heavy metal ions from this industrial waste. In this study, the transport of Cu(II) ions through coconut oil membrane and as the receiving phase of ethylenediaminetetraacetic (EDTA) has been carried out. The optimization results obtained, namely the source phase of Cu(II) metal ions pH 4 with a concentration of 3.147 x 10-4 M, the receiving phase of EDTA solution pH 7 with a concentration of 0.06 M, 200 rpm stirring speed, obtained the transport of Cu(II) metal ions to the receiving phase, namely, 23.44% with a transport time of 1 hour. Furthermore, the test was carried out with the same optimum conditions using HCl as the receiving phase, and the percentage value of Cu(II) metal ions in the receiving phase was 25%, from using the EDTA receiving phase.
Profil Metabolit Sekunder, Fenolik Total, Aktivitas Antibakteri dan Antijamur Ekstrak Daun Sungkai (Peronema canescens Jack) Dari Daerah Bengkulu dan Pariaman -, Norman Ferdinal; Fischa A., Wulandari; Suryati, Suryati
Jurnal Kimia Unand Vol. 13 No. 2 (2024): November 2024
Publisher : Departemen Kimia Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jku.13.2.8-17.2024

Abstract

Indonesian people have long recognized and utilized plants that have medicinal properties to overcome health problems. One of the medicinal plants that grow in Indonesia and is commonly used by the community is the Sungkai plant (Peronema canescens Jack). This Sungkai plant is spread across the island of Sumatra including Bengkulu and Pariaman regions. This study used methanol, ethyl acetate, and hexane extracts of sungkai leaves growing in Bengkulu and Pariaman areas for phytochemical screening, total phenolic content using the Folin-Ciocalteu method, and determination of antibacterial activity against Escherichia coli and Staphylococcus aureus bacteria, as well as determination of Candida albicans antifungal activity using the well diffusion method. The results showed that sungkai leaf extract contained phenolics, flavonoids, saponins, steroids, and alkaloids. The methanol extract of sungkai leaves from Bengkulu and Pariaman had the highest total phenolic content of 175.3671 mg GAE/g sample and 227.7021 mg GAE/g sample, respectively. In the antibacterial activity test, the ethyl acetate extract of sungkai leaves from Bengkulu and Pariaman produced the largest inhibition zone with moderate criteria, namely 5.22 mm and 6.38 mm against Escherichia coli and Staphylococcus aureus obtained inhibition zones of 7.13 mm and 6.08 mm. The antifungal activity showed the largest inhibition zone in the ethyl acetate extract of sungkai leaves from Bengkulu and Pariaman regions, namely 5.22 mm and 6.40 mm, which are included in the moderate category.
Skrinning Fitokimia, Kandungan Flavonoid Total dan Uji Aktivitas Antioksidan Ekstrak Kayu Balakka (Phyllanthus emblica L.) Adam, Dini Hariyati
Jurnal Kimia Unand Vol. 13 No. 2 (2024): November 2024
Publisher : Departemen Kimia Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jku.13.2.18-23.2024

Abstract

Balakka plant (Phyllanthus emblica L.) is a plant that has the potential to protect the pancreas, through antioxidant and anti-diabetic activities. This study aims to determine the content of metabolite compounds of balakka wood samples macerated using hexane, ethyl acetate and ethanol solvents, total flavonoid content and antioxidant activity of balakka wood extract. Total flavonoid content was determined using AlCl3 and kursetin standard solution. This AlCl3 method will later produce a red chelate that can be measured with a visible spectrophotometer at a wavelength of 435 nm. While antioxidant activity was measured by the DPPH method. The results showed that the highest total flavonoid content was in the ethanol extract of 60.39 mg/L and antioxidant activity with an IC50 value of 28.97 ppm. Thus, the ethanol extract of balakka wood showed the highest flavonoid content and can be categorized as a very strong antioxidant.
Penggunaan Zeolit sebagai Adsorben untuk Penjernihan Air Sumur terhadap Kandungan Logam Fe, Nilai BOD, COD, dan TSS di Kelurahan Kampuang Jua Nan XX, Kecamatan Lubuk Begalung, Kota Padang Zilfa, Z.; Yusuf, Yulizar; Syahputra, Dian
Jurnal Kimia Unand Vol. 13 No. 2 (2024): November 2024
Publisher : Departemen Kimia Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jku.13.2.24-33.2024

Abstract

Nobita Hill is an area that will be used as a tourist destination located in Kampung Jua Nan XX Village, at the foot of Nobita Hill, precisely in RW III, there are many houses with poor well water quality. The purpose of this study is to determine the use of zeolite (adsorbent) to purify well water based on Fe metal content parameters, BOD, COD, TSS values and also to determine the effect of adsorbent mass, sample volume, contact time and stirring time on the adsorption process. Determination of Fe content using atomic absorption spectrophotometry (AAS). Determination of the value of Biological Oxygen Demand (BOD) using the Iodometric titration method, determining the value of Chemical Oxygen Demand (COD) using the visible spectrophotometric method and determining the value of Total Suspended Solids (TSS) using the gravimetric method. Zeolite was characterized by X-Ray Fluorescence (XRF) before and after adsorption. Analysis of the concentration of Fe in well water before adsorption 2.1 mg/L. 40 mL of well water was adsorbed with 0.1 g of zeolite for 45 minutes at a stirring speed of 200 rpm, Fe decreased by 96.1%, from 2.1 mg/L to 0.1 mg/L. COD, BOD and TSS values also decreased 57.1%, 63.9% and 67.5% respectively. Characterization using XRF showed a decrease in Si and Al content and an increase in Fe metal content in the adsorbent after adsorption.

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