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Jurnal Kimia (Journal of Chemistry)
Published by Universitas Udayana
ISSN : 19079850     EISSN : 25992740     DOI : 10.24843/JCHEM
Core Subject : Science,
Chemistry
Jurnal Kimia (Journal of Chemistry) publishes papers on all aspects of fundamental and applied chemistry. The journal is naturally broad in scope, welcomes submissions from across a range of disciplines, and reports both theoretical and experimental studies.
Arjuna Subject : Kimia(semua kategori) - Kimia (Lain-Lain)
Articles 518 Documents
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OPTIMASI METODE EKSTRAKSI KUERSETIN DARI DAUN KELOR (Moringa oleifera L.) N. P. L. Laksmiani; I W. A. Widiantara; K. D. Adnyani; A. B. S. Pawarrangan
Jurnal Kimia (Journal of Chemistry) Vol.14 No.1 Januari 2020
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (596.65 KB) | DOI: 10.24843/JCHEM.2020.v14.i01.p04

Abstract

Moringa plants is very abundant in Indonesia. Moringa leaves are a source of polyphenol compounds, namely flavonoids. One of the main flavonoids found in Moringa leaves is quercetin. To be able to increase the concentration of quercetin from moringa plants, extraction is necessary. This study aims to determine the most optimal extraction method in extracting quercetin from Moringa leaves. Optimization of quersein extraction methods from Moringa leaves was carried out using maceration, soxhletation, and reflux methods. The solvent used was methanol acidified with 1,2 N HCl. Determination of the concentration of quercetin in the extract used a validated TLC-densitometry method. The highest rendement obtained from the maceration extraction method was 24.08 % w/w. Extraction by reflux and sochletation methods yielded rendement of 23.44 % w/w and 10.12 % w/w respectively. Qualitative analysis of quercetin in the extract was carried out by comparing its Rf value with the standard quercetin which is 0,4. The quercetin level of the extract from maceration extraction was the highest, which was 24.45 % w/w. Extraction using the soxhletation method obtained quercetin as much as 20.95 % w/w. Keywords: quercetin, Moringa oleifera leaves, extraction method, optimization
PERTUMBUHAN Streptococcus mutans PADA BIOAKTIVITAS EKSTRAK RIMPANG LENGKUAS SECARA in vitro DAN PEMANFAATANNYA SEBAGAI ZAT AKTIF PADA PASTA GIGI iurlina Siregar; Ferdinand Saras Dhiksawan; Anna Farida
Jurnal Kimia (Journal of Chemistry) Vol. 5, No. 1 Januari 2011
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (342.542 KB)

Abstract

The study aims to (i) isolate white galangal (Alpinia galanga) and red (Alpinia purpuruta) rhizome extract compound, (ii) examine its bioactivity against Staphylococcus mutans, and (iii) investigate its usage as an active substance in tooth paste in the laboratory. The result of the study indicates that the extract of n-hexane of red galangal has a higher bioactivity effect against Staphylococcus aureus compared to the white one. The examination of the experimental tooth paste with an addition of 1 % active substance (extract of n-hexane, namely D and J fractions) indicates that the diameter of resistance against Staphylococcus aureus formed by D fraction is higher (15.5 mm) than the positive control (15 mm). Meanwhile, an addition of active substance of 1.5 % D and J fractions indicates a higher diameter of resistance (16.2 mm and 14.7 mm) compared to positive control.. IR and GC-MS analysis indicates that the most dominant compound existing in D fraction is 2-metil -1-(o-tolil)pentanol, while the most dominant compound in the J fraction is 2--ethyl-5-methyl benzoic acid.
PENENTUAN KADAR 8-HIDROKSI-2’-DEOKSIGUANOSIN (8-OHdG) DALAM URIN TIKUS SETELAH TERPAPAR ETANOL DAN ASAP ROKOK Mahardika Aprilia Iflahah; Ni Made Suaniti; Ida Ayu Raka Astiti Asih
Jurnal Kimia (Journal of Chemistry) Vol. 8, No. 1 Januari 2014
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (241.428 KB) | DOI: 10.24843/JCHEM.2014.v08.i01.p07

Abstract

Urinary level of 8-OHdG in rats after exposure to ethanol and smoke have been investigated for 15 days with TLC-Spectrophotodensitometer. Ethanol and smoke exposure to could increase the number of Reactive Oxygen Species (ROS), which could lead to a state called oxidative stress. 8-OHdG compound is the result of DNA oxidation by ROS in the body in the form of guanine nucleotide. This 8-OHdG is a water-soluble compound excreted in urine easily. In this study, exposure of ethanol and smoke both singly and combined had an effect on the level of 8-OHdG. Urinary level of 8-OHdG in the control group; groups exposed to ethanol, smoke, and ethanol-smoke were (0,00 ± 0,00)%, (0,33 ± 0,08)%, (0,25 ± 0,10)%, and (0,57 ± 0,27)% respectively.
Karakteristik Pelepasan Hara N Pupuk yang Terlapisi Lateks-Chitosan M. Moh. Hamzah; K. K. Eryanti; A. S. Hidayat; F. F. Kurniawati
Jurnal Kimia (Journal of Chemistry) Vol. 12 No.1 Januari 2018
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (602.404 KB) | DOI: 10.24843/JCHEM.2018.v12.i01.p15

Abstract

Pupuk merupakan salah satu industri prioritas bagi pertanian dan berkontribusi 15 hingga 30 % dalam struktur biaya usaha pertanian padi. Pada penggunaan pupuk di lapangan masih banyak kehilangan unsur hara pada waktu pemupukan di lapangan (sawah) sehingga efisiensi penggunaan pupuk berkurang. Pengembangan dan inovasi teknologi produk pupuk pertanian yang efisien pada saat ini salah satunya adalah memodifikasi pupuk dengan cara pelapisan pada permukaan granul pupuk. Dalam penelitian ini lateks-chitosan digunakan sebagai inhibitor nitrifikasi. Secara umum penelitian suatu bahan melibatkan karakterisasi dengan metoda SEM untuk mengetahui karakteristik mikrografis bahan lateks-chitosan. Lapisan lateks-chitosan mampu memperkuat struktur butiran pupuk saat diuji perendaman dalam air selama 6 bulan. Lapisan tipis lateks-chitosan sebagai inhibitor nitrifikasi pada produk pupuk pertanian memiliki ketebalan sekitar 84,50 - 197,7 ?m dan diameter pori sekitar 2,88 - 4,16 ?m. Jumlah pelepasan hara N pupuk granul NPK 16-16-16 chitosan dilapisi lebih tinggi dari kitosan lateks chitosan.
BIOSORPSI ION Cr(III) PADA RUMPUT LAUT Eucheuma Spinosum TERAKTIVASI ASAM SULFAT I W. Sudiarta
Jurnal Kimia (Journal of Chemistry) Vol. 3, No. 2 Juli 2009
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (282.887 KB)

Abstract

Biosorption of chromium(III) ion on sulfuric acid activated algae (Eucheuma spinosum) biosorbent havebeen studied in this research. The studies included determination of optimum ratio of sulphuric acid to biosorbentalgae, biosorbent acidity, isoterm and biosorption capacity, and interaction mechanisms of Cr(III) on biosorbent. Themechanisms interaction of Cr(III) on biosorbent can be determinted from the sequential desorption of Cr(III) usingH2O, 1M HCl and 0.05M Na2EDTA.The result showed that the optimum ratio of sulphuric acid to biosorbent was 1.5 mmol/g. It was also foundthat the total acidity of acid-activated and untreated algae biosorbent were 8.56±0.21 and 2.59± 0.28 mmol/grespectively. The biosorption capacity of activated biosorbent toward Cr(III) was 72.33 mg/g while the capacity ofuntreated biosorbent was 57.32 mg/g. The interaction mechanisms of Cr(III) with biosorbent were found to bemainly through the ionic interaction, while the interaction through hydrogen bonding, van der Walls, andcomplexation were found to be relative us low.
PEMBUATAN KOMPOSIT ZnO-ARANG AKTIF SEBAGAI FOTOKATALIS UNTUK MENDEGRADASI ZAT WARNA METILEN BIRU Dewa Ayu Wismayanti; Ni Putu Diantariani; Sri Rahayu Santi
Jurnal Kimia (Journal of Chemistry) Vol. 9, no. 1 Januari 2015
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (295.282 KB) | DOI: 10.24843/JCHEM.2015.v09.i01.p18

Abstract

Preparation of ZnO-activated carbon composite with a mass ratio of ZnO : activated charcoal of 5:2; 5:1 and 15:2 have been carried out using the sol-gel method The characterisation of  ZnO-activated carbon composite was done by using  X-Ray Diffraction (X-RD) and Fourier Transform Infra Red (FT-IR). The characterization using X-RD showed that the ZnO has an hexagonal crystal structure  with crystal size of 23.13 nm; 23.38 nm and 40.25 nm, while FT-IR spectra showed that there were Zn-O strain, C-O aliphatic, C-H bending, C-C aliphatic  and O-H bending vibrations. ZnO-activated carbon composite was applicated as photocatalyst to degradate  methylene blue by irradiatting  the compound with UV light for 5 hours. The  results showed that the ZnO-activated carbon composite at the ratio of 5:1 at optimum pH of 11 gave the highest percentage of methylene blue degradation which was of 99,97±0,02 %.
PENGARUH KONSENTRASI AMMONIUM SULFAT ((NH4)2SO4) SEBAGAI SUMBER NITROGEN TERHADAP PRODUKSI BIOETANOL BERBAHAN BAKU Glacilaria sp. Ni Putu Widayanti; Wiwik Susanah Rita; Yenni Ciawi
Jurnal Kimia (Journal of Chemistry) Vol. 7, No. 1 Januari 2013
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (147.963 KB) | DOI: 10.24843/JCHEM.2013.v07.i01.p01

Abstract

The aims of this research are to determine the concentration of reducing sugar and starch in Glacilaria sp. and to investigate the influence of the concentration of ammonium sulfate as nitrogen source on the production of bioethanol using Glacilaria sp. as the carbon source. The concentrations of ammonium sulfate employed were 0,25%; 0,50%; 0,75%; and 1% (w/v). The methods employed in this research were the determination of water content, glucose and starch concentration using Nelson-Somogyi method, determinating the optimum duration of fermentation, pH measurement, and the determination of  ethanol concentration. The results showed that the concentrations of reducing sugar and starch in Glacilaria sp. are 17,14% and 15,42%. The concentration of (NH4)2SO4, which produced the optimum concentration of ethanol (1,04% (v/v) on seventh day), was 1% (w/v). The fermentation media containing (NH4)2SO4 of 1%; 0,75%; 0,5%; and 0,25% (w/v) produced optimum concentrations of ethanol, which were 0,96% (v/v) on fifth day; 0,78% (v/v) on seventh day; 0,74% (v/v) on seventh days; and 0,73% (v/v) on seventh day, respectively. The optimum concentration of (NH4)2SO4 was 1% (w/v), which produced maximum concentration of  bioethanol from Glacilaria sp., of 0,96% (v/v).
PENGARUH EKSTRAKSI TERHADAP EFEKTIVITAS SERBUK BIJI SEMANGKA (CURCUBITACEAE) DAN SERBUK BIJI ASEM (FABACEAE) SEBAGAI KOAGULAN ALAMI PENGGANTI TAWAS - Yunita; Anak Agung Istri Agung Mayun Laksmiwati; Ni Komang Ariati
Jurnal Kimia (Journal of Chemistry) Vol. 11. No. 1 Januari 2017
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (359.344 KB) | DOI: 10.24843/JCHEM.2017.v11.i01.p14

Abstract

Koagulan alami adalah koagulan yang berasal dari tanaman biji yang mengandung protein polikationik sehingga dapat menetralisir partikel muatan dalam rantai koloid. Protein yang larut dalam air akan bermuatan positif, dan memiliki sifat polielektrolit yang sama dengan tawas. Penelitian ini menggunakan serbuk biji asem dan semangka sebagai koagulan alami, dengan membandingkan hasil filtrat per hari yang dimaserasi dengan n-heksan, etanol, tanpa maserasi serta residu hasil maserasi. Pengukuran tingkat kekeruhan dilakukan dengan menggunakan metode jar test. Sedangkan penurunan kekeruhan dilakukan dengan alat turbidimeter. Hasil penelitian menunjukkan bahwa penurunan kekeruhan (NTU) filtrat serbuk biji asem yang dimaserasi n-heksan terbaik di hari keenam dan yang dimaserasi etanol terbaik di hari pertama dengan NTU berurutan 72,16% dan 82,16%, sedangkan yang tanpa maserasi NTUnya 60,00%. Pada filtrat serbuk biji semangka yang dimaserasi n-heksan terbaik di hari ketiga dan yang dimaserasi etanol terbaik di hari kelima dengan NTU 69,75% dan 65,50%, sedangkan yang tanpa maserasi NTUnya 52,50%. Nilai tingkat kekeruhan dari residu serbuk biji asem yang dimaserasi dengan n-heksan dan etanol berturut-turut 70,16% dan 62,00%, sedangkan NTU dari residu biji semangka yang dimaserasi dengan n-heksan dan etanol menunjukkan hasil yang sama yaitu 60,00%. Dari hasil penelitian dapat dikatakan bahwa filtrat dari serbuk biji asem yang dimaserasi etanol paling baik sebagai koagulan alami pengganti tawas, dibandingkan filtrat serbuk biji semangka dan residunya.
AKTIVITAS AGEN PENCERAH KULIT DARI KATEKIN SECARA IN SILICO N. K. M. Giantari; I W. I. Prayoga; N. P. L. Laksmiani
Jurnal Kimia (Journal of Chemistry) Vol.13 No.2 Juli 2019
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (294.076 KB) | DOI: 10.24843/JCHEM.2019.v13.i02.p12

Abstract

Darkening of the skin results from excessive production of melanin in the skin caused by an increase in tyrosinase related protein 1 enzyme activity. Catechins are flavonoid compounds which contain antioxidants. This study aims to determine the affinity and mechanism of catechins as skin lightening agents by inhibiting tyrosinase related protein 1 target proteins in silico using molecular docking methods. The study was carried out exploratively with the stages of preparing a database of 3D structures of catechins and tyrosinase related protein 1, optimization of 3D structure of catechins, protein preparation, validation of molecular docking methods, and docking of catechins in tyrosinase related protein 1. Docking results are assessed from the bonding energy and hydrogen bonds formed between catechins and proteins. The smaller the bond energy value, the stronger the bond between the catechins and proteins. The results showed that catechins had activity as skin lightening agents because they were able to inhibit the tyrosinase related protein 1 with a bond energy value of -6,35 Kcal/mol. The energy value of the catechin bond with the tyrosinase related protein 1 is smaller than the tyrosinase related protein 1 with its native ligand. This shows that catechins have greater potential and affinity in inhibiting the tyrosinase related protein 1 enzyme with hydrogen bonds on amino acid residues, namely ARG374. Based on the results obtained, catechins have activity as skin lightening agents with the mechanism of inhibiting the tyrosinase related protein 1 enzyme so that the amount of eumelanin formed is less and the skin becomes brighter. Key words: catechins, skin lightening, tyrosinase related protein 1, in silico, molecular docking
CEMARAN PESTISIDA KLOR-ORGANIK DALAM AIR DANAU BUYAN BULELENG BALI I. B. Putra Manuaba
Jurnal Kimia (Journal of Chemistry) Vol. 1, No. 2 Juli 2007
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (92.634 KB)

Abstract

The use of pesticide around the Lake Buyan is inevitable. This will introduce pollutant to either thesoil or lake water. In this research, organochlorine pesticide residual contamination in water was investigated. LakeBuyan is used as the investigation model, since there were a lot of pressure to the lake as a consequence of increasinghuman activities such as tourism, hotel and restaurant, and farming.This is an expost facto study with Analytical Cross Sectional Study design, within two step activities, i.e.field study in order to gain sampling zone and obtaining sample needed. Followed by laboratory works in order toobtain pesticide residual contamination on water. Sample preparation for this purposed was carried out following astandard method. Gas Chromathographi was employed in order to gain the pesticide contaminant.Positive organochlorine pesticide contaminant, i.e. DDT and chlorotalonile were observed from 55sampling point of water taken from five sampling zones. DDT in the water was 5.02 ppb which is still bellow themaximum level of 42 ppb. Chlorotalonile in water was 1.99 ppb. There is no threshold value of these pesticideresidues on the Government regulation, however, this contamination is still bellow the RfD which is 15 ppb.

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