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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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KONSENTRASI TOTAL SENYAWA ANTOSIANIN EKSTRAK KELOPAK BUNGA ROSELLA (Hibiscus sabdariffa L.) : PENGARUH TEMPERATUR DAN pH E.K. Hayati; U.S Budi; R. Hermawan
Jurnal Kimia (Journal of Chemistry) Vol. 6, No. 2 Juli 2012
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 (319.376 KB)

Abstract

Recently, Roselle (Hibiscus sabdariffa L.) has been used for tea. Based on this background, research was conducted with the aims: (1) To determine the rate of anthocyanin degradation heating of the roselle calyx extract (Hibiscus sabdariffa L.), (2) To determine the effects of changes during storage on the stability and total concentration of anthicyanin. This research was conducted by extracting the sample with 2% citric acid. Concentrated extract was used to test the stability upon heating temperature, pH during the storage process for ± 30 days. The results of this study indicate that extracts of roselle calyx (Hibiscus sabdariffa L.) experienced a decrease in concentration at 80°C. The anthocyanin degradation rate followed the equation of r = 0.014T – 1.169 with the lowest concentration of 32.916 mg / L.
KARAKTERISTIK DAN KAPASITAS BIOSORBEN KULIT JERUK SIAM LUMAJANG (Citrus nobilis Tan.) TERAKTIVASI H2SO4 DALAM MENURUNKAN KADAR Ca DAN Mg DALAM AIR Anak Agung Gede Agung Satrya Dwipayana; I Wayan Sudiarta; I Wayan Budiarsa Suyasa
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 (251.572 KB) | DOI: 10.24843/JCHEM.2017.v11.i01.p05

Abstract

Kulit jeruk merupakan salah satu limbah yang dapat dimanfaatkan sebagai biosorben. Biosorben kulit jeruk ini dapat digunakan untuk menurunkan kadar logam Ca dan Mg dalam air. Aktivasi biosorben dari kulit jeruk telah dilakukan dengan mencampur serbuk kulit jeruk dengan H2SO4 3% dengan perbandingan H2SO4 terhadap serbuk kulit jeruk sebesar 15 mL : 1 g. Kulit jeruk teraktivasi H2SO4 dianalisis luas permukaannya dengan metode metilen biru. Penentuan waktu setimbang biosorben kulit jeruk terhadap logam Ca dan Mg dilakukan dengan variasi waktu 5, 10, 15 dan 20 menit. Variasi waktu yang didapatkan digunakan untuk menentukan isoterm adsorpsi dari biosorben kulit jeruk teraktivasi dengan variasi konsentrasi 50, 75, 100, dan 125 ppm. Kapasitas adsorpsi dari adsorben kulit jeruk teraktivasi dapat diketahui dari perhitungan nilai b pada persamaan isoterm adsorpsi Lamgmuir dan nilai log K pada persamaan isoterm adsorpsi Freundlich. Hasil dari penentuan luas permukaan biosorben kulit jeruk teraktivasi adalah 32,01 m2/g. Pada penentuan waktu setimbang adsorpsi didapatkan hasil waktu terbaik untuk penyerapan logam Ca yaitu 20 menit dimana penyerapannya sebesar 9,83 mg/g dan waktu terbaik untuk penyerapan logam Mg adalah 5 menit dengan penyerapan sebesar 8,29 mg/g. Pada tahap penentuan isoterm adsorpsi biosorben kuit jeruk teraktivasi didapatkan hasil bahwa penyerapan logam Ca dan Mg lebih dominan mengikuti pola isoterm adsorpsi Freundlich, hal ini dikarenakan nilai R2 untuk persamaan Freundlich pada masing-masing logam Ca dan Mg yaitu 0,8622 dan 0,9989 lebih besar dibandingkan nilai R2 pada persamaan Langmuir yaitu 0,6541 dan 0,9864. Nilai kapasitas adsorpsi dari biosorben kulit jeruk terhadap masing-masing logam yaitu untuk logam Ca sebesar 0,16 mg/g dan untuk logam Mg sebesar 1,90 mg/g.
FORMULASI SEDIAAN SIRUP PENINGKAT IMUNITAS DARI HERBA MENIRAN (Phyllanthus niruri L.) W. O. Sugarda; K.D.C. Dewi; K.W.A. Putra; M.B. Yogiswara; C.B.A.C. Sukawati; P.A.R. Sutresna; N.L.G.J. Dewi; C.I.S. Arisanti; P.S. Yustiantara
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 (127.596 KB) | DOI: 10.24843/JCHEM.2019.v13.i02.p03

Abstract

Meniran herb (Phyllanthus niruri L.) is a plant that has been scientifically proven to have activity as a natural immunomodulator. The effectiveness of natural immunomodulators from meniran herbs can be improved by formulating the ethanolic extract of meniran herbs into syrup preparations. This research was conducted to find out that the herbal extracts obtained had fulfilled the parameters of extract quality standards so that they could be formulated into pharmaceutical products. Standardization of herbal extracts includes testing of moisture content, testing of total ash content, testing of acid-soluble ash content, and testing of total flavonoid levels. Ethanol extract of Meniran herbs was obtained by maceration using 95% ethanol. Testing the extract moisture content produced extracts with a moisture content of 7.295%. Total ash content was 3%, acid insoluble ash content was 1.2% and total flavonoid content was 3.15%. Keywords: formulation, immunity, syrup, Phyllanthus niruri L.
KARAKTERISASI TOXOPLASMA GONDII ISOLAT INDONESIA Sagung Chandra Yowani; Endang Kumolosasi; Marlia Singgih Wibowo
Jurnal Kimia (Journal of Chemistry) Vol. 1, No. 1 Januari 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 (1226.125 KB)

Abstract

Cathodic protection basically reduces the corrosion rate of a metallic structure by reducing its corrosionpotential, Toxoplasma gondii isolated from diaphragm of sheep at an abbatoir in Sukabumi, West Java had beencharacterized by Centre Research Institute for Animal Sciences. The characterization included study of morphologyby optical microscope, study of ultrastructure by transmission electron microscope, the study of the parasite growthin mice Mus musculus, and study of proteins of the parasite. The growth of parasite in mice had been studied usingtwo groups of mice i.e., normal group and immunosuppressed group. The number of parasites was comparedstatistically using student’ t-pair test. Results showed that dexamethasone at a dose of 5.2 mg/20 g body weight intraperitoneally to the immunosuppresed mice did not increase the number of extracelluler parasites in the peritonealfluid. The best parasite harvest time was on the 4th day after inoculation. Determination of parasite protein obtainedat 4 days after inoculation using sodium dodecyl sulphate polyacrylamide gel electrophoresis showed a dominantsurface protein of 42 kDa.
PENGARUH PERLAKUAN BIOFILTRASI EKOSISTEM BUATAN TERHADAP PENURUNAN COD, NITRAT, DAN pH AIR LIMBAH PENCUCIAN RUMPUT LAUT W. Gina Anggreni; I Wayan Budiarsa Suyasa; Wahyu Dwijani S.
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 (324.287 KB) | DOI: 10.24843/JCHEM.2014.v08.i01.p16

Abstract

Research on seaweed effluent treatment through biofiltration of artificial ecosystem was carried out to determine the effectiveness, capacity, and the minimum duration of biofiltration process to reduce COD, nitrate and pH in water to meet the quality standard. The result shows that effectiveness of treatment system without added microorganisms are 79.22% for COD, 38.77% for nitrate, and 35.64% for pH; whereas, by adding microorganisms are 83.93% for COD, 55.54% for nitrate, and 36.43% for pH. Capacity of the treatment system without added microorganisms are 12.0653 mg/L/m3hr for COD, 0,0089 mg/L/m3hr for nitrate, and 0,1444 hr-1 for pH; while, by adding microorganisms are 12,7819 mg/L/m3hr for COD, 0,0129 mg/L/m3hr for nitrate, and 0,1413 hr-1 for pH. Requisite minimum time in treatment system to meet the quality standard without added microorganisms are 48 hours for COD, 8 hours for nitrate, and 8 hours for pH; whereas, by adding microorganisms are 40 hours for COD, 8 hours for nitrate, and 8 hours for pH.
AKTIVITAS LARVASIDA MINYAK ATSIRI PADA DAUN SIRIH (Piper betle Linn) TERHADAP LARVA NYAMUK Aedes aegypti I Made Oka Adi Parwata; Sri Rahayu Santi; I Made Sulaksana; Ida Ayu Alit Widiarthini
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 (203.756 KB)

Abstract

Isolation and larvacide activity of essential oil from Piper betle Linn were studied. Approximately 13,5 mL of essential oil was obtained from 10,0 kg fresh leaves of Piper betle Linn. The oil is pale yellow with density of 0,7148 g/mL. Phytochemical test indicates that the content of the oil are terpenoid and phenol compounds with toxicity Aedes aegypty larvae 0f LC50= 309,03 ppm. The essential oil was toxic towards Aedes aegypty larvae because it contains phenol compounds, i.e. Eugenol, cavichol.GC-MS analysis reveals that there are 9 compound, i.e. 4-methyl(1-methylnethyl)-3-cyclohexen-1-ol, 1-methoxy-4(1-propenyl) benzene, 4-(2-propenyl)phenol/cavicol, 4-alylphenylacetate, Eugenol, Karyofilen, 3-alyl-6-methoxyphenylacetate, 4-alyl-1,2-diacetoxybenzene and decahydro-4a-methyl-1-methylene-7(1-methylethenyl) naphthalene.Based on the peaks intensity the oil was dominated by 4 compounds i.e. 4-allyl phenyl acetate, 2 methoxy-4-(2 prophenyl) phenol/eugenol, 3-allyl-6-methoxy phenyl acetate, 4-(2-prophenyl)-phenol / cavicol. These four compounds probably act as the active compounds to kill Aedes aegypty larvae, as they are acetate and phenol compounds.
SINTESIS SENYAWA KALKON SERTA UJI AKTIVITAS SEBAGAI ANTIOKSIDAN I Wayan Suirta
Jurnal Kimia (Journal of Chemistry) Vol. 10, No. 1 Januari 2016
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 (127.424 KB) | DOI: 10.24843/JCHEM.2016.v10.i01.p10

Abstract

Synthesis chalcone compound by reaction between acetofenone and benzaldehyde using natrium hydroxide as catalyst with distil water or ethanol as solvent has been done. The yield was determined using antioxidant activity test with DPPH and GC-MS. The result of synthesis was pale yellow crystal with melting point of 55-570C. The synthesis in distil water yielded 84,98 %, and the formation of crystal was about 1 hour. The synthesis in ethanol resulted 87,68% yield, with the formation of crystal about 15 minutes. The product showed weak antioxidant activity with reduction percentage averaged at 50%. The GC-MS showed the presence of chalcone compound with sufficiently high purity.
BIOSINTESIS NANOPARTIKEL ZnO MENGGUNAKAN RAGI SACCHAROMYCES CEREVISIAE GALUR A12 DAN KARAKTERISASINYA A. Fatimah; E. Risky; S. Ishmayana; D. Rakhmawati Eddy
Jurnal Kimia (Journal of Chemistry) Vol.12 No.2 Juli 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 (432.737 KB) | DOI: 10.24843/JCHEM.2018.v12.i02.p04

Abstract

ZnO merupakan material semikonduktor yang memiliki energi celah pita 3,3 eV. Karakteristik ini menyebabkan ZnO memiliki berbagai macam aplikasi. Nanopartikel ZnO diketahui memiliki sifat katalitik, fotonik, optoelektronik, penyaring UV, sifat antimikroba, konduktivitas yang baik, juga memiliki stabilitas kimia yang baik. Nanopartikel ZnO dapat disintesis melalui proses sintesis fisika dan kimia tetapi memiliki beberapa kelemahan seperti membutuhkan suhu dan tekanan tinggi juga penggunaan pelarut yang berbahaya. Biosintesis merupakan cara alternatif untuk menyintesis nanopartikel ZnO karena prosesnya yang sederhana tidak menggunakan suhu dan tekanan tinggi juga pelarut yang berbahaya. Pada penelitian ini digunakan ragi Saccharomyces cerevisiae galur A12 dan seng asetat dihidrat sebagai prekursor. Hasil sintesis kemudian dikarakterisasi menggunakan spektrofotometer UV-Visibel menujukkan puncak pada daerah 380 nm sesuai dengan standar ZnO, puncak pada 430 cm-1 yang menunjukkan adanya stretching Zn-O berdasarkan hasil karakterisasi menggunakan Fourier Transform Infrared (FTIR), dan ukuran kristal rata-rata sebesar 37,4 nm berdasarkan karakterisasi menggunakan X-Ray Diffraction (XRD). Kata kunci: biosintesis, nanopartikel, Sacharomyces cerevisiae, ZnO
SINTESIS SENYAWA orto-FENILAZO-2-NAFTOL SEBAGAI INDIKATOR DALAM TITRASI I W. Suirta
Jurnal Kimia (Journal of Chemistry) Vol. 4, No. 1 Januari 2010
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

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Abstract

Synthesis of o-fenilazo-2-naphtol used as indicator in titration has been conducted in this research. Thesynthesis was carried out by coupling of diazonium chloride salt with 2-naphtol, and aniline. The product wascharacterized using spectroscopy techniques (IR, 1HNMR, and MS), while the pKHIn was determined using UV-visspectrometer. The application of the product as indicator in titration was compared to methyl-orange.The synthesis gave a red crystal with 62.51 % yield. Infra red spectra analysis showed the presence ofcharacteristic functional groups such as–OH, CH-aromatic, C=C, N=N, CN, CO, and a peak indicated substituents atortho position. 1HNMR showed three separated peaks. Mass spectra gave molecular ion peak (M+) at m/z 248. Thered crystal obtained melted at 128-131oC. Based on spectroscopy analysis and melting point, it can be concludedthat the product was o-fenilazo-2-naphtol. The product had a pKHin of 3.16, therefore it can be used as indicator foracid-base titration which showed equivalent point at pH 5.
SPESIASI DAN BIOAVAILABILITAS LOGAM BERAT TIMBAL (Pb) DAN TEMBAGA (Cu) DALAM SEDIMEN SUNGAI TUKAD BADUNG Nanik Wijayanti; I Made Siaka; Ida Ayu Gede Widihati
Jurnal Kimia (Journal of Chemistry) Vol. 9, No. 2 Juli 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 (72.332 KB) | DOI: 10.24843/JCHEM.2015.v09.i02.p11

Abstract

A study of speciation and bioavailability of heavy metals, Pb and Cu in sediments of Tukad Badung river with sequential extraction method has been carried out. This study aimed to determine the levels of bioavailability of both Pb and Cu heavy metals. The determination of total heavy metal contents was performed by digestion technique with the use of a mixture of HNO3 and HCl (3:1) in ultrasonic bath for 45 minutes at 60oC followed by heating on a hotplate for 45 minutes at 140oC. The mesurement of total heavy metals and heavy metal species was established with the use of Atomic Absorption Spectrophotometer (AAS) with calibration curve method. Concentration of total Pb and Cu in the sediments of Tukad Badung river ranged from 4.2669 to 27.9171 mg/kg and 20.5240 to 69.3782 mg/kg respectively. The speciation of Pb obtained in carbonate fraction of the EFLE (easly, freely, leachable and exchangable) fractions ranged from 1.5952-11.6315 mg/kg, in Fe/Mn oxide fraction ranged from 0.4001 to 6.7680 mg/kg, in organic/sulfide fraction ranged from 0.8759 to 13.6600 mg/kg, and in the silicate fraction (resistant) ranged between Nd (not detected) to 4.6598 mg/kg. The level of bioavailability Pb in sediments ranged from 9 to70% while the non-bioavailability levels ranged from 0 to 30%. Carbonate fraction (EFLE) of Cu ranged between Nd (not detected) to 6.3527 mg/kg. The fraction of  Fe/Mn oxides ranged from 0.7331 to 9.9033 mg/kg, organic sulfide fraction ranged from 8.1790 to 41.5756 mg/kg, and the silicate fraction was foud vary between 7.5138 and 21.0200 mg/kg. The level of Cu bioavailability in sediments ranged from Nd (not detectable) to 18%, while the level of non bioavailability ranged from 15 to 44%.

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