cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
-
Contact Email
-
Phone
-
Journal Mail Official
jurnalrisetkimia@sci.unand.ac.id
Editorial Address
Department of Chemistry Faculty of Mathematics and Natural Sciences Universitas Andalas Kampus Universitas Andalas Limau Manih Padang 25163
Location
Kota padang,
Sumatera barat
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 12, No 2 (2021): September" : 12 Documents clear
Pengolahan Minyak Jelantah Menggunakan Membran Poliamida/Titanium Dioksida/Arang Aktif Kulit Durian Safitri, Rika Endara; Hayaati, Ria Sheftiana Rusli
Jurnal Riset Kimia Vol 12, No 2 (2021): September
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v12i2.410

Abstract

Processing of wasted cooking oil uses the photocatalyst method with metal catalysts and zeolites to reduce organic compounds. In this study, researchers used activated charcoal from durian skin and titanium dioxide embedded in a polyamide membrane as an adsorbent which was used as a medium for processing wasted cooking oil. The purpose of this study was to determine the effect of processing used cooking oil using a membrane of polyamide/titanium dioxide/durian peels activated charcoal on changes in the characteristics of wasted cooking oil. Based on the results of research on the processing of wasted cooking oil with a membrane of polyamide/titanium dioxide/activated charcoal from durian peels, there was an increase in water content by 10.21%, a decrease in free fatty acids by 33.75%, a decrease in the peroxide number by 18.33%. Used cooking oil that has passed through the membrane has a decrease in %Transmission for the functional groups of C-H alkenes, C-O esters, and C-H alkanes. In the analysis of the compound content by mass spectrophotometry, it was found that the content of the methyl ester compound with the C17 and C19 chains was close to the composition of the biodiesel constituents.
Potensi Daun Pacar Air (Impatiens balsamina L.) dalam Menghambat Pertumbuhan Jamur Rhizopus oryzae L. Adfa, Morina; Ekasari, Munifilia; Avidlyandi, Avidlyandi; Supriati, Rochmah; Yudha S., Salprima
Jurnal Riset Kimia Vol 12, No 2 (2021): September
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v12i2.404

Abstract

Pacar air (Impatiens balsamina L.) plant belongs to the Balsaminaceae family and is used as an indigenous medicine in Asia for fingernail inflammation, fractures, and rheumatism treatments. Moreover, the antipruritic, antianaphylactic, antifungal, antibacterial, and antitumor activities of some compounds, especially phenolics and quinones from this plant have been studied extensively. Therefore, this study aims to determine the antifungal activity of Pacar air leaves (Impatiens balsamina L.) methanol extract against Rhizopus oryzae L. and the IC50 value. The results showed that an increase in the concentrations of I. balsamina L. leaves methanol extract significantly raised the fungal growth. Furthermore, the extract inhibition against R. oryzae L. at various concentrations of 0.5; 0.7; 0.9; 1.1; and 1.3% w/v were 10, 21.9, 58.06, 68.06, and 79.72%, respectively, while the IC50 value was 0.896%. Hence, the presence of naphthoquinones and other secondary metabolites are responsible for its antifungal activity. Based on these results, the antifungal potential of I. balsamina L. leaves against soft-rot fungi is useful in the future.
Pemurnian Fikosianin dari Spirulina platensis dengan Metode Liquid Biphasic Flotation (LBF) dan Penentuan Aktivitas Antioksidannya Elise, Cori Yolanda; Syafrizayanti, Syafrizayanti; Salim, Marniati
Jurnal Riset Kimia Vol 12, No 2 (2021): September
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v12i2.412

Abstract

Phycocyanin from Spirulina platensis (S. Platensis) is a pigment-complex protein belong to the light-harvesting phycobiliprotein family. The pigments have high economic value as a natural blue dye as well as the source of antioxidants and anticancer. Production of pure natural phycocyanin remains in high demand. Therefore, this study aimed to obtain phycocyanin with high purity values using modified liquid biphasic flotation (LBF) system and tested for DPPH (1,1-diphenyl-2-pycrilhydrazil) radical scavenging activity. This study produced high purity phycocyanin with purification fold 3.041 ± 0.04 and recovery yields approximately about 70.881%. Purified phycocyanin showed scavenging activity with IC50 of   338.585 mg/mL. Thus, the LBF system yielded high purity phycocyanin pigments.
Uji Aktivitas Antioksidan dan Fenolik Total Fraksi Etil Asetat Daun Sembung (Blumea balsamifera (L.) DC) Rahmi, Azimatur; Afriani, Tika; Hevira, Linda; Widiawati, Wike
Jurnal Riset Kimia Vol 12, No 2 (2021): September
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v12i2.383

Abstract

The aim of this study is to investigate antioxidant activity and total phenolic content of ethyl acetate fraction of Sembung leaves. Sembung (Blumea balsamifera L.) is a plant that has the potential as an antioxidant because it contains secondary metabolites of alkaloids, steroids, flavonoids, saponins, and phenolic compounds. In this study, antioxidant activity was tested by using 1,1-diphenyl-2-picrylhydrazyl (DPPH) for free radical scavenging activity assay. Evaluation of total phenolic content was tested by using the Folin-Ciocalteau method. The results showed that the ethyl acetate fraction of Sembung leaves possess showed medium antioxidant activity with IC50 valueof 221.821 compare with reference standard ascorbic acid with IC50 value 68.25 ppm. The ethyl acetate fraction of Sembung leaves has a total phenolic content of 161.101 mg GAE/g. This study provided that Blumea balsamifera leaves possess antioxidant.
Pemanfaatan Sabut Pinang sebagai Kombinasi Filter Multi Media-Sabut Pinang (FMM-SP) di Perumahan Valensia Muaro Jambi dan Uji Kualitas Air Bersih Safita, Reny; Kurniawan, Fery; Deliza, Deliza
Jurnal Riset Kimia Vol 12, No 2 (2021): September
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v12i2.405

Abstract

This study aims to help the residential community of Valencia, Muaro Jambi to get clean water using filter multi media-sabut pinang (FMM-SP).Multimedia filtration is a method of water treatment by utilizing soil as the main medium which is shaped like brick blocks and arranged alternately between zeolites.The LMM-FSP reactor is made of used gallons, 40 cm high, 28 cm in diameter, containing brick blocks (12x7x4) cm consisting of a mixture of volcanic soil, charcoal, areca fiber, iron powder (70 :10 :10: 5) %, permeable layer used zeolite (1-3 mm). The samples came from the wells of residents of Valencian housing, Muaro Jambi, Jambi City. The research was carried out with variations in the mass of areca nut into the filter, flow rates of 5, 10, 15, 20 mL/minute and two ways, namely aeration and non-aeration. FMM-SP efficiency for the aeration process at a flow rate of 5 ml/min with pH parameters; Smell; Nitrite; Nitrate; turbidity; Mn; Fe in order is 7.5; Odorless, 60.30%; 59.33%; 59.33%; 70.10%; 73.20%, and in non-aerated pH 7.3; Odorless; 50.82%; 48.37%; 60.91%, Fe 61.20% From all the efficiency values for decreasing the parameters, it can be said that it meets the requirements for clean water.
Pengolahan Limbah Pewarna Metilen Biru Menggunakan Arang Aktif dan Zeolit Aktif dengan Katalis Fe dan Oksidator Hidrogen Peroksida Maryudi, Maryudi; Aktawan, Agus; Amelia, Shinta
Jurnal Riset Kimia Vol 12, No 2 (2021): September
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v12i2.414

Abstract

The textile industry including batik has provided broad benefits to society from an economic standpoint. However, there is negative impact from wastewater generated in the production process, which is containing dyes. Various types of dyes are used in the coloring process, and methylene blue is one of most used dye. Various ways have been done to treat wastewater containing methylene blue. Methylene blue processing techniques by adsorption have been carried out with various types of adsorbents. Research on the comparison of the ability of commercial activated charcoal and commercial activated zeolite to adsorb methylene blue was carried out with the addition of an Fe catalyst and a hydrogen peroxide oxidizer. The results showed that the addition of Fe catalyst would increase the degradation of methylene blue in the waste either with activated charcoal or activated zeolite. The combination of using Fe catalyst and hydrogen peroxide oxidizer further increases the removal of methylene blue in both types of adsorbents, activated charcoal and activated zeolite. Activated zeolite has the better ability to adsorb methylene blue than activated charcoal under various conditions.
Activated Carbon Addition Methods on the Pre-impregnation Process of Co-Mo in Y-Zeolite Ultra Stable: A Properties Exploration and Enhancement of Metals Loaded Hidayat, Yuniawan; Nugrahaningtyas, Khoirina Dwi; Hendrastuti, Priska Julia
Jurnal Riset Kimia Vol 12, No 2 (2021): September
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v12i2.384

Abstract

The amount of loaded Co-Mo metal on the Y-Zeolite Ultra Stable (USY) was increased by the addition of activated carbon in the pre-impregnation process. USY modification was done by adding activated carbon to USY as much as 10 wt%. The process of adding activated carbon is carried out by three methods, i.e., grinding with sucrose binder (ACU1), without sucrose (ACU2), and conducting by ball milling (ACU3). Wet impregnation method was employed to disperse the Co and Mo, sequentially. Composites were characterized using Fourier Transform Infrared (FTIR), X-ray diffraction (XRD), and surface area analyzer (SAA). Metal dispersions were observed by X-ray fluorescence (XRF). The FTIR suggests an interaction between USY and activated car-bon, while the XRD result indicated the none structural transformation of USY zeolite. The SAA analysis showed an increased total pore radius with the activated carbon addition. The XRF confirmed the increasing of total metals dispersion of 6.25% (ACU1); 5.48%(ACU2); 5.18% (ACU3); compare to USY origin with 3.28% metals loaded.
Pengembangan Metode Serbuk Daun Suji (Pleomele angustifolia N.E.Br) sebagai Identifikasi Sidik Jari Laten Sari, Sri Adelila; Nasution, Desi Heriyanti
Jurnal Riset Kimia Vol 12, No 2 (2021): September
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v12i2.406

Abstract

Fingerprint is a technology that can be used to identify a person. The dusting method is most often used on latent fingerprints because it is relatively easy and simple. However, the composition of the ingredients used in latent fingerprint powder is toxic and can be hazardous to health. This research was carried out using a new natural powder from Suji leaf as a simple, non-toxic, and cheaper. Suji leaf powder produces a green color that comes from the chlorophyll compounds contained in it. This chlorophyll compound will bind to alanine to identify latent fingerprints. The particle sizes used in this study were of 60-200 mesh. The results found that the particle sizes of 100 and 200 mesh provided good green contrast and clear visualization of the fingerprint patterns. Meanwhile, at the particle size of 60 and 80 mesh, it was found that the results were not clear visualized. The highest percentage of fingerprint patterns based on blood group, gender and ethnicity was found in form of loops. The percentage of fingerprint patterns formed based on the highest was of O 31.1; B 12.2; AB 8.8; and A 6.6 percent. The highest percentage of fingerprint patterns formed by gender were of 45.5 for women and 13.3 percent for men. The highest percentage of fingerprint patterns formed by ethnicity were Malay 21.1, Batak 20, and Javanese 17.7 percent.
Voltametri Pelucutan Anodik Menggunakan Elektroda Pasta Karbon Termodifikasi Bentonit untuk Penentuan Kadar Ion Cd(II) dalam Sayur Sawi Putih Irdhawati, Irdhawati; Titasia, Ni Kadak Nevi; Sahara, Emmy
Jurnal Riset Kimia Vol 12, No 2 (2021): September
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v12i2.417

Abstract

In this study, the measurement of Cd(II) ion by anodic stripping voltammetry technique was conducted using bentonite modified carbon paste as working electrode (CPE-B). The performance of CPE-B was compared with carbon paste electrode without bentonite (CPE) and applied for determination of Cd(II) concentration in chicory. Optimized parameters were composition of bentonite in carbon paste electrode, deposition time, deposition potential, and scan rate. Validation of measurements was observed including determination of linear concentration range, detection and quantization limits, repeatability of measurement, and percentage of recovery. The optimum composition of bentonite in CPE-B was found at 50%. Furthermore, in the optimization of measurements condition was found the optimum deposition times were 90 and 60 s, deposition potentials were -0.63 and -0.53 V, and scan rates were 15 and 20 mV/s, for CPE and CPE-B. The linear range concentration for CPE observed at 25-2000 µg/L and CPE-B was 5-50 µg/L. Limit of detection and quantization using CPE-B were 0.337 µg/L and 0.349 µg/L, lower than CPE i.e., 0.470 µg/L and 0.471 µg/L, respectively. Repeatability measurement of Cd(II) had Horwitz Ratio value less than two, and percentage of recovery was 96.73 8.33%. The level of Cd(II) ion in chicory was found at 6.98 0.40 mg/kg.
Biodecolorization of Remazol Brilliant Blue–R dye by Tropical White-Rot Fungi and Their Enzymes in The Presence of Guaiacol Anita, Sita Heris; Ningsih, Fitria; Yanto, Dede Heri Yuli
Jurnal Riset Kimia Vol 12, No 2 (2021): September
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v12i2.388

Abstract

The ability of the tropical white-rot fungi and their enzyme to decolorize synthetic dyes was investigated. Production of lignin-modifying enzymes (LMEs) from the three new isolated fungi, namely Trametes hirsuta D7, Ceriporia sp. BIOM 3, and Cymatoderma dendriticum WM01 were observed for 9 days incubation under static condition. The results showed that the LMEs production enhanced in the present of guaiacol. T. hirsuta D7 produced only laccase (Lac), with the highest activity was 22.6 U/L on the 5th-day of the cultivation. At the same time, Ceriporia sp. BIOM 3 and C. dendriticum WM01 secreted both laccases (Lac) with the activities 0.2 U/L and 1.0 U/L, respectively, and manganese peroxidase (MnP) with the activities 0.1 U/L and 1.0 U/L, respectively. Among the fungi, T. hirsuta D7 efficiently degraded 65% Remazol Brilliant Blue–R (RBBR) dye within 72 h using the only laccase. This study shows that laccase may have a major role in synthetic dyes' decolorization process, followed by MnP and LiP.

Page 1 of 2 | Total Record : 12

 1   2 

Filter by Year

2021 2021


Reset
Filter By Issues
All Issue Vol. 16 No. 2 (2025): September Vol. 16 No. 1 (2025): March Vol. 15 No. 2 (2024): September Vol. 15 No. 1 (2024): March Vol. 14 No. 2 (2023): September Vol. 14 No. 1 (2023): March Vol. 13 No. 2 (2022): September Vol. 13 No. 1 (2022): March Vol 13, No 1 (2022): March Vol. 12 No. 2 (2021): September Vol 12, No 2 (2021): September Vol 12, No 1 (2021): March Vol. 12 No. 1 (2021): March Vol. 11 No. 2 (2020): September Vol 11, No 2 (2020): September Vol. 11 No. 1 (2020): March Vol 11, No 1 (2020): March Vol 10, No 2 (2019): September Vol. 10 No. 2 (2019): September Vol 10, No 1 (2019): March Vol. 10 No. 1 (2019): March Vol 10, No 1 (2019): March Vol. 9 No. 2 (2016): March Vol 9, No 2 (2016): March Vol 9, No 1 (2015): September Vol. 9 No. 1 (2015): September Vol. 8 No. 2 (2015): March Vol 8, No 2 (2015): March Vol 7, No 2 (2014): March Vol. 7 No. 2 (2014): March Vol 5, No 2 (2012): March Vol. 5 No. 2 (2012): March Vol 5, No 1 (2011): September Vol. 5 No. 1 (2011): September Vol. 4 No. 2 (2011): March Vol 4, No 2 (2011): March Vol. 4 No. 1 (2010): September Vol 4, No 1 (2010): September Vol 3, No 2 (2010): March Vol. 3 No. 2 (2010): March Vol 3, No 1 (2009): September Vol. 3 No. 1 (2009): September Vol. 2 No. 2 (2009): March Vol 2, No 2 (2009): March Vol 2, No 1 (2008): September Vol. 2 No. 1 (2008): September Vol. 1 No. 2 (2008): March Vol 1, No 2 (2008): March Vol. 1 No. 1 (2007): September Vol 1, No 1 (2007): September More Issue