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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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AKTIVITAS ANTIOKSIDAN ANTOSIANIN DALAM EKSTRAK ETANOL KULIT BUAH NAGA SUPER MERAH (Hylocereus costaricensis) DAN ANALISIS KADAR TOTALNYA Ni Ketut Meidayanti Putri; I Wayan Gede Gunawan; I Wayan Suarsa
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 (160.981 KB) | DOI: 10.24843/JCHEM.2015.v09.i02.p15

Abstract

Dragon fruit is a plant that comes from dry tropical climate zones. Besides the flesh of the dragon fruits,,its skin can be used in food production as a natural food coloring and as the raw materials in cosmetics manufacturing. This is because of that the skin of the dragon fruit contains some compounds such as anthocyanin that can be used as an antioxidant. This study were aimed to determine the antioxidant activity,  total anthocyanin content and the type of anthocyanins in the ethanol extract of super red dragon fruit skin. The determination of antioxidant activity of anthocyanin was carried out by the use of DPPH method, whereas the determination of the total content of anthocyanin was performed with a pH difference method using UV-Visibel spectrophotometer. The results showed that the optimum scavenger percentage of the extract was of 97.84% with IC50 value of 73.2772 mg / L, whereas the average levels of total anthocyanins obtained was of 58.0720 ± 0,0001mg / L. The type of anthocyanins contained in the ethanol extract of the skin of super red dragon fruit was sianidin showing a maximum peak at a wavelength of 547 nm.
PEMANFAATAN ARANG BATANG PISANG (Musa paradisiacal) UNTUK MENURUNKAN KESADAHAN AIR Ni Made Shinta Megawati; Anak Agung Bawa Putra; James Sibarani
Jurnal Kimia (Journal of Chemistry) Vol. 7, No. 2 Juli 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 (264.805 KB) | DOI: 10.24843/JCHEM.2013.v07.i02.p06

Abstract

The study about utilization of char made from banana (Musa paradisiacal) to reduce water hardness had been carried out. In this study, the surface area, equilibrium time of adsorption of metal ions, adsorption isotherm, capacity of adsorption, and the effect of pH on metal ions adsorption were used as parameters. Futher the optimum conditions were used to reduce the water hardness. The results of this study showed that the surface area, capacity of adsorption on Ca from 100 ppm solution were 3.3932 m2/g and 2.8112 mg/g respectively with equilibrium time of 90 minutes. Whereas, the capacity of adsorption on Mg2+from 75 ppm solution was 2.3371 mg/g with equilibrium time of 90 minutes. The adsorption capacity increased to the highest value at pH 7 which were 4.1197 mg/g and 3.0210 mg/g for Ca2+and Mg2+ respectively. The value of total hardness of water samples decreased by 63.057 mg/L in 4 hours contact time.
AKTIVITAS ANTIOKSIDAN EKSTRAK ETANOL KULIT JERUK KINTAMANI (Citrus aurantium L.) DALAM MENURUNKAN KETENGIKAN MINYAK KELAPA P Oka Sudiana; I M Oka Adi Parwata; J J Sibarani
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 (210.475 KB) | DOI: 10.24843/JCHEM.2018.v12.i01.p01

Abstract

Paper ini membahas penentuan aktivitas antioksidan dan pengaruh penambahan ekstrak etanol kulit buah jeruk kintamani (EEKBJK) dalam menurunkan ketengikan minyak kelapa yang sudah dipanaskan pada suhu 200oC, 250oC, 300oC selama 5 menit kemudian didiamkan selama 3 hari.Kerusakan pada minyak kelapa dilihat dari nilai bilangan peroksida, bilangan asam dan kadar asam lemak bebas. Hasil pengukuran aktivitas antioksidan menunjukkan bahwa IC50 dari EEKBJK sebesar 53,71 mg/L. Hal ini menunjukkan EEKBJK mampu sebagai antioksidan. Penurunan masing-masing bilangan peroksida minyak kelapa dengan penambahan EEKBJK 0,02% b/v adalah 50,19%, 31,74% dan 16,01%. Penurunan masing-masing bilangan asam minyak kelapa dengan penambahan EEKBJK 0,02% b/v adalah 29,55%, 28,21% dan 18,42%. Penurunan masing-masing kadar FFA minyak kelapa dengan penambahan EEKBJK 0,02% b/v adalah 29,55%, 28,21% dan 18,42%.
PENETAPAN RHODAMIN B PADA SAMPEL LIPSTIK DENGAN MENGGUNAKAN KLT-SPEKTROFOTODENSITOMETRI N.N.A.S. Devi; N.P.M.P.P. Winarni; I.P. Priyasana; G.A.D. Mayagita; V. Rahmadinha; K.M. Limba; A.A.I.K. Dewi; I K.N. Sanjaya; N.P.L. Laksmiani
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 (99.374 KB) | DOI: 10.24843/JCHEM.2020.v14.i01.p13

Abstract

Lipsticks are widely used by women to beautify themselves. Among the various colors that make lipstick more interesting, red color lipstick is the most demanded one. Rhodamine B is a synthetic dye that banned for use and certified as a hazardous material according to Minister of Health of Indonesian Republic No. 376/Menkes/Per/1990 because it causes liver damage, kidney and lymph glands damage, followed with organ enlargement. The aim of this study is to identify Rhodamine B in lipsticks in the market. Samples were taken from 3 shops in Denpasar City and Badung Regency. Samples were soaked with amonia solution with using wool yarn to extract the rhodamine B dye and identification using TLC plate silica gel GF254 withn-butanol: ethyl acetate: amonia (1322:5.2:6.5) as mobile phase then detected with UV light 254 and 366 nm. Identification by spectrophotodensitometry where the TLC plate was observed in the TLC Analyzer to observe the AUC in each spot formed. The AUC obtained from the instrument illustrates the concentration of the analyte in each bottle. The result shows that 3 examined samples doesn’t contain rhodamine B. Keywords: Rhodamin B, Lipstik, TLC, Spectrophotodensitometry
ISOLASI CASHEW NUT SHELL LIQUID DARI KULIT BIJI JAMBU METE (Anacardium occidentale L) DAN KAJIAN BEBERAPA SIFAT FISIKO-KIMIANYA I N. Simpen
Jurnal Kimia (Journal of Chemistry) Vol. 2, No. 2 Juli 2008
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 (64.34 KB)

Abstract

The research on the isolation of Cashew Nut Shell Liquid (CNSL) from seed husk of cashew nut by solidliquidextraction has been carried out. The extraction used mixture of chlorofom-ethanol (3:1, 1:1, 1:3) and hexaneethanol(3:1, 1:1, 1:3). The extract was analysed for its phisico-chemical properties namely density, viscosity, acidity,and iod number. The extract with highest rendement was analysed by GC-MS (gas cromatography-massspectrometry) and infrared (IR) spectrophotometer to prove that anacardic was the mayor component of CNSL.The highest rendement (44.38 %) was resulted from the extraction using 3:1 hexane-ethanol. The extract hasa density of 0.9352 g/mL, a viscosity of 8.98 pise, acid of 96.94 mg NaOH/g CNSL, and 86.98 g iod/100g CNSL.The GC-MS and IR analyses showed that the major component of CNSL was anacardic acid.
IDENTIFIKASI DAN UJI AKTIVITAS SENYAWA FLAVONOID DARI EKSTRAK DAUN TREMBESI (Samanea saman (Jacq.) Merr) SEBAGAI PENGENDALI JAMUR Fusarium sp. PADA TANAMAN BUAH NAGA Putu Sariningsih; Wiwik Susanah Rita; Ni Made Puspawati
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 (195.116 KB) | DOI: 10.24843/JCHEM.2015.v09.i01.p04

Abstract

This study aimed to examine antifungal activity of Trembesi (Samanea saman (Jacq.) Merr) leaves extract against Fusarium sp on dragon fruit and to identify types of flavonoid compounds present in the extracts. Isolation of the flavonoids was started by maceration followed by fractionation into n-hexane, chloroform, and ethyl acetate respectively. Separation was carried out by preparative layer chromatography while identification was done using Ultraviolet-Visible and Infrared spectrophotometer. Antifungal activity test showed that ethylacetate extract has mild activity in inhibiting the growth of Fusarium sp. (inhibition zone 6.75 mm).  The antifungal activity testing of three isolates positive flavanoid (B4, B5, B6) showed at the concentration of 10 % they have not given activity yet. The infrared spectra of isolates (B4, B5, B6) were very similar, therefore they have the same functional groups (OH, C-OH, aromatic CH, aliphatic CH, C=O, C-O-C ether, and aromatic C=C). The UV-Vis spectra showed isolates B4 gave absorption at a wavelength of 336.00 nm (band I) and 268.40 nm (band II), isolates B5 at 269.20 nm (bands II), and 325.40 nm (band I), and isolates B6 at 475.40 nm (bandI) and 282.40 nm (band II). Further UV-Vis identification using shift reagents suggested that isolates B4 was tentatively identified as 3,7,8,4 ', 5' pentahydroxy flavonols, isolates B5 as 3,5,4 'trihydroxy flavones, and  isolate B6 as 3,5,7,8,3', 4 'hexahidroxy anthocyanine.
MOLECULAR MODELING STUDY OF BORIC ACID IMPRINTED POLYMER FOR QUARTZ CRYSTAL MICROBALANCE APPLICATION Iqmal Tahir; Mohd Noor Ahmad; A.K.M. Shafiqul Islam; Dahyar Arbain
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 (283.76 KB)

Abstract

Design of boric acid imprinted polymer has Been conducted using molecular modeling approach to fabricate thYn film for sensor applications on quartz crystal microbalance. The study was carried out to find an optimum mole ratio between boric acid as the template and methacrylic acid as functional monomer. Molecular modeling was performed using AM1 semiempirical – quantum mechanics on Hyperchem 8.0 software. The result showed was stabilite of supramolecular structure between boric acid and methacrylic acid on ratios of 1:3 and 1:6. Recommendation of boric acid imprinted polymer is suggested to synthesize on mole ratio of 1:3.
PEMANFAATAN LIMBAH SERBUK KAYU MERBAU (Instia spp.) SEBAGAI PEWARNA KAIN KATUN DENGAN PENAMBAHAN KAPUR SIRIH I Wayan Suirta; Ida Ayu Gede Widihati; I Putu Eka Suwita Hegara
Jurnal Kimia (Journal of Chemistry) Vol. 10, No. 2 Juli 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 (83.143 KB) | DOI: 10.24843/JCHEM.2016.v10.i02.p02

Abstract

Telah dilakukan penelitian mengenai pemanfaatan limbah serbuk kayu merbau (Instia spp.)sebagai pewarna kain katun dengan penambahan mordan kapur sirih. Ekstraksi zat warna limbah serbuk kayu merbau dengan pelarut air perbandingan 1:20 (b/v) (10 gram sampel : 200 mL pelarut) menghasilkan ekstrak berwarna coklat kemerahan yang selanjutnya digunakan untuk mewarnai kain katun dengan variasi penambahan mordan kapur sirih sebanyak 2, 3, 5, 8, dan 12 gram. Ekstrak dapat mewarnai kain katun dengan warna yang bervariasi yakni coklat muda, coklat kemerahan, dan coklat tua. Penambahan mordan kapur sirih mampu membentuk ikatan yang kuat antara zat warna dengan serat pada kain katun serta dapat mempertajam warna pada kain yang dihasilkan. Uji ketahanan warna kain katun dilakukan dengan perendaman menggunakan air deterjen 1% yang dalam waktu 10 menit menunjukkan kain katun yang diwarnai tanpa penambahan mordan mudah luntur, sedangkan pewarnaan dengan penambahan kapur sirih tidak mudah luntur.
PEMBUATAN DAN KARAKTERISASI ARANG AKTIF DARI BATANG LIMBAH TANAMAN GUMITIR DENGAN AKTIVATOR ZnCl2 E. Sahara; D. E. Permatasaari; I W. Suarsa
Jurnal Kimia (Journal of Chemistry) Vol.13 No.1 Januari 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 (438.579 KB) | DOI: 10.24843/JCHEM.2019.v13.i01.p15

Abstract

The agricultural waste of gumitir plants stem can be used as an ingredient in producing an activated carbon. Some researchers have reported that the additions of phosphoric acid and NaOH as chemical activators have resulted in an activated carbon that met the SNI (Indonesian National Standard) 06-3730-1995 about technical activated carbon. The purpose of this study was to produce and characterize the activated carbon from the stem of gumitir plants carbonized at 300oC for 90 minutes with the use of ZnCl2 as the activator. The activation was carried out by adding ZnCl2 to an amount of carbon in various mole ratios. The characteristics of the activated carbon obtained were compared to the SNI. It was evident that the addition of 0.1 mole of ZnCl2 to 1 gram of the carbon produced an activated carbon that met the SNI standard, namely, water content of 5.00%, as content of 8.33%, volatile content of 950oC of heating of 7.36%, carbon content of 79,30%, iodine absorption capacity of 788.1271 mg/g, and methylene blue absorption capacity of 260.7917 mg/g. The surface area and surfae acidity of this carbon was of 677,6270 mg2/g and 0.3396 mmol/g, respectively. The functional group analysis of this activated carbon showed the presence of O-H, COOH, C-O aldehyde, alkaline C-C and C-H groups.
KARAKTERISASI KATALIS BATU PADAS LEDGESTONE TERAKTIVASI ASAM DAN APLIKASINYA PADA PEMBUATAN BIODIESEL DARI MINYAK JELANTAH Ika Juliana; Ida Ayu Gede Widihati; Oka Ratnayani
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 (307.028 KB) | DOI: 10.24843/JCHEM.2016.v10.i01.p05

Abstract

This research aims to improve characteristics of ledgestone catalyst by using acid activation with various concentrations. The acid used for activation was H2SO4 with concentrations of 1, 2 and 3M. The characterization of catalysts was carried out by acid-base titration method to determine the surface acidity, methylene blue adsorption to measure the spesific surface area of ??the catalyst, and the NH4OAc extraction method to measure the value of cation exchange capacity of the catalyst. Ledgestone catalyst with the best character was applied to convert waste cooking oil into biodiesel. The characterization of biodiesel was carried out by densitometry to determine the density of biodiesel, Oswald viskosimetry to measure the viscosity, and Gas Chromatography-Mass Spectrometry (GCMS) to determine the composition of chemical compounds of the biodiesel. The results showed that the concentration of acid used to activate ledgestone catalyst with the best character was 1M. This acid-activated ledgestone (catalyst A1) had a value of surface acidity, surface area, active sites number, and high cation exchange capacity were 0.3530 ± 0.0011 mmol / gram and35.7581 m2/gram, 2.1258 x 1020 atoms/gram, and 5.88 me/100 g, respectively. The concentration of catalyst A1 producing the highest biodiesel yield was 1% w/v. The produced biodiesel was 74,71% with 0.02% FFA, acid value of 0.0438 mg KOH/gram biodiesel, density of 0.7850 g/mL, kinematic viscosity of 0.4650 cSt. Two major compounds of the biodiesel were methyl hexadecanoate with area of 71.84% and cis methyl-9-octadecenoate with area of 28.16%.

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