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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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LAJU KOROSI DAN MEKANISME INHIBISI ALUMINIUM MURNI MENGGUNAKAN KALIUM DAN KALSIUM STEARAT Tiurlina Siregar
Jurnal Kimia (Journal of Chemistry) Vol. 4, No. 2 Juli 2010
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 (1144.463 KB)

Abstract

A research on corrosion rate and inhibition mechanism of pure aluminum using potassium stearate andcalcium stearate has been carried out. The objectives of this research were to explore the type of inhibitor ofpotassium stearate and calcium stearate, to understand the reaction mechanism of corrosion inhibition of aluminum,and to study the effect of the salts toward corrosion rate of aluminum in acidic condition.Potassium and calcium citrates were found to inhibit the corrosion of pure aluminum at concentration of 60ppm, in acidic (pH 3) condition, at 25oC. The inhibition efficiencies and relative corrosion rates were : 76 %; 0,31(calcium stearate) and 73 %; 0,31 (potassium stearate). The result of the study on surface adsorption, bychromatography and spectroscopy suggested that the aluminum inhibition mechanism by the potassium stearate andcalcium stearate anions was due to the formation of surface film as a consequence of the formation of complexbetween aluminum surface atoms / ions with stearate (monodentate ligans) which donate their lone pair electronstoward aluminum.
UJI AKTIVITAS REPELAN MINYAK ATSIRI BUAH LILIGUNDI (Vitex trifolia Linn) TERHADAP NYAMUK AEDES AEGYPTI I Wayan Sugiri Adiyasa; Sri Rahayu Santi; Manuntun Manurung
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 (230.797 KB) | DOI: 10.24843/JCHEM.2014.v08.i01.p04

Abstract

The isolation and repellent activity of essential oil extracted from fruit of Vitex trifolia against Aedes aegypti has been done. Distillation of 15 kg samples produced 7,6 mL essential oils with 0,819 ± 0,05 g/mL of density and 0,0418% ± 0,01% (b/b) of yields. Identification with Gas Chromatography-Mass Spectrometry results showed that the essential oil composed of 16 compounds  and was a rich source of ?-Pinene, Sabinene, 1,8-Cineol, and ?-Charyophyllene. Varied concentrations of the essential oil of 7,5%, 15%, and 20% solution in 96% ethanol and DEET 15% as positive control were tested for their repellent activities against Aedes aegypti. The result of ANOVA test showed that there was significant difference in protection abilities amongst the essential oil solutions for 6 hour test. The result of Tukey/HSD test showed that 15% and 20% of essential oils solutions possesed repellent activity as strong as positive control at first test and the 20% of essential oils solution possesed repellent activity as strong as positive control at first hour. Based on the above results it can be concluded that the essential oil of Vitex trifolia fruit posseses repellent activity against Aedes aegypti.
APLIKASI ELEKTRODE GLASSY CARBON DIMODIFIKASI NANOPARTIKEL EMAS TERHADAP PENENTUAN Cr(III) DENGAN PENGARUH Fe(III), Mn(II), Co(II) DAN Ni(II) SECARA VOLTAMMETRI S. S. Wyantuti; I. F. Sukmana; D. D. Rakhmawaty; Y. W. Hartati
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 (320.01 KB) | DOI: 10.24843/JCHEM.2018.v12.i01.p12

Abstract

Kromium banyak digunakan dalam bidang industri, akibatnya limbah dari senyawa kromium tersebut juga banyak tercipta baik di udara, tanah maupun air. Cr(III) diperlukan dalam jumlah kecil dalam membantu insulin dalam menormalkan jumlah glukosa dan kolesterol dan bermanfaat pada metabolisme lemak . Kekurangan Cr(III) dapat menyebabkan penyakit yang disebut penyakit kekurangan kromium (chromium deficiency). Untuk itu diperlukan suatu metode yang sensitif dan efektif untuk menganalisis kromium. Metode voltammetri merupakan metode yang menjanjikan, karena dapat menggunakan elektrode kerja yang bisa secara luas dimodifikasi. Penelitian ini bertujuan untuk mempelajari pengaruh ion Fe(III), Mn(II), Co(II) dan Ni(II) pada analisis kromium, serta mengetahui akurasi, presisi, dan limit deteksi dari penentuan Cr(III) secara volltammetri pulsa differensial. Prosedur yang akan dilakukan adalah pembuatan larutan-larutan, pembuatan koloid nanopartikel emas, modifikasi GCE, optimasi scan rate, deteksi pengaruh ion besi(II), mangan(II), kobalt(II) dan Ni(II) pada pengukuran Cr(III) serta deteksi Cr(III) dalam limbah elektroplating secara voltammetri menggunakan elektroda glassy carbon nanopartikel emas. Hasil dari penelitian menunjukkan bahwa Ion Fe(III), Mn(II), Co(II) dan Ni(II) terbukti mempengaruhi tinggi arus Cr(III). Akurasi pengukuran sebesar 96,17%, presisi sebesar 98,19% dan limit deteksi sebesar 4,6889 ppm. Konsentrasi Cr(III) dalam limbah elektroplating dapat ditentukan dengan metode standar adisi yaitu sebesar 60,072 ppm.
ISOLASI DAN IDENTIFIKASI GOLONGAN SENYAWA TOKSIK DARI DAGING BUAH PARE (Momordica charantia L.) I G. A. Gede Bawa
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

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Abstract

Isolation and identification of toxic compounds were conducted to snake fruit (Momordica charantia L.).Maseration of 600 grams dried fruit in methanol resulted in 54.250 grams dark green extract which were toxic tobrine shrimp (Artemia salina Leach) with an LC50 = 74.99 ppm. When the extract was dissolved in water andpartitioned using n-hexane and chloroform three extracts were obtained. The n-hexane extract was found to be themost toxic to brine shrimp (LC50 = 130.439 ppm).Separation of the n-hexane extract using column chromatography resulted in 7 fractions. The most toxicfraction (F), LC50 = 33.83 ppm, was pure based on TLC.FTIR analyses showed that the active components of the extract contains triterpenoides characterized by CHaliphatic groups (CH2, CH3), binded O-H, C-O, C=C, and C=O. UV-Vis spectra showed absorption at 274,2 and432,8 nm suggesting an n * electronic transition.
PENENTUAN LAJU REAKSI MAKSIMAL (Vmaks) DAN KONSTANTA MICHAELIS-MENTEN (KM) ENZIM LIPASE PANKREAS PADA SUBSTRAT MINYAK KELAPA, MINYAK SAWIT, DAN MINYAK ZAITUN Ketut Ratnayani; A. A. I. A. Mayun Laksmiwati; Maman Sudiarto
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 (107.552 KB) | DOI: 10.24843/JCHEM.2015.v09.i01.p15

Abstract

A main element in the Michaelis-Menten equation is Km, which is typical for a particular enzyme, with a specific substrate at a certain pH and temperature conditions. The aim of this study is determining the difference in the maximum rates (Vmax) and Michaelis-Menten constant (Km) of pancreatic lipase on the coconut oil, palm oil, and olive oil substrates and the most effective hydrolysis by the pancreatic lipases. Km value was calculated by measuring the rate of the catalyzed hydrolysis with various concentrations of pH, temperature, and the optimum incubation time. Before calculating the value of Vmax and Km, the initial rate (v0) was calculated with the titrimetric method. The results showed that Vmax was  2,11 × 10-3 mmol/min on coconut oil substrate; 2,30 × 10-3 mmol/min on palm oil substrates; and 1,60 × 10-3 mmol/minutes on olive oil substrate. While the pancreatic lipase Km values ??were 1,21 × 104 ppm on coconut oil; 2,29 × 104 ppm on palm oil; and 1,60 × 104 ppm on the olive oil. This results suggested the pancreatic lipase catalyzed the hydrolysis was most effective on coconut oil compared with palm oil and olive oil.
APLIKASI KULIT BUAH MANGGIS (Garcinia mangostana L.) SEBAGAI PEWARNA ALAMI PADA KAIN KATUN SECARA PRE-MORDANTING Manuntun Manurung
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

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Abstract

The research about utilization of mangosteen skin as a natural dies on cotton by pre-mordanting methods with 1% (w/v) of lime water. The physical and chemical properties of the natural dies were tested using 1% w/v of detergent. The extraction of natural dye was conducted by heating in water with ratio 1:20 w/v for one hour. The results showed that the optimum mass of natural dye was adsorbed about 0.0402 g without mordant  and the colour was light brown.The pre-mordanting method gives optimum mass of natural dyes adsorbed of  0.0637 g, which with reddish brwon color. The color was brighter and more resistant to detergent solution.
ANALISIS BILANGAN PEROKSIDA MINYAK SAWIT HASIL GORENGAN TEMPE PADA BERBAGAI WAKTU PEMANASAN DENGAN TITRASI IODOMETRI Dwi Anggraeni Putri Suandi; Ni Made Suaniti; Anak Agung Bawa Putra
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 (155.711 KB) | DOI: 10.24843/JCHEM.2017.v11.i01.p11

Abstract

Minyak sawit merupakan salah satu jenis minyak yang biasanya dimanfaatkan untuk menggoreng berbagai hidangan. Mutu atau kualitas minyak goreng dapat mempengaruhi gizi pangan hasil gorengan yang selanjutnya minyak sisa gorengan dapat ditentukan nilai bilangan peroksida akibat adanya proses oksidasi. Penelitian ini bertujuan untuk menganalisis bilangan peroksida pada minyak goreng sawit yang telah digunakan untuk menggoreng tempe yang terkontaminasi logam berat Pb pada berbagai waktu pemanasan secara Iodometri. Hasil penelitian menunjukkan bahwa terjadi peningkatan bilangan peroksida minyak yang terkontaminasi Pb seiring bertambah lamanya waktu pemanasan minyak, yaitu berkisar antara 0,8715 meq/kg sampai 4,0852 meq/kg. Hasil tersebut mengindikasikan bahwa semakin banyak bilangan peroksida pada minyak maka semakin jelek kualitas minyak dan pangan yang digoreng. Adanya peningkatan bilangan peroksida pada penelitian ini tidak hanya disebabkan oleh adanya oksigen tetapi juga logam berat Pb yang terkandung dalam tempe yang digoreng.  
MOLECULAR DOCKING AKTIVITAS ANTIKANKER DARI KUERSETIN TERHADAP KANKER PAYUDARA SECARA IN SILICO M. B. O. Rastini; N. K. M. Giantari; K. D. Adnyani; 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 (434.745 KB) | DOI: 10.24843/JCHEM.2019.v13.i02.p09

Abstract

Breast cancer can be initiated by either overexpression of HER-2 protein which can induce dimerization and autophosphorylation so that it triggers the activation of Focal Adhesion Kinase (FAK) resulting in migration and metastasis in breast cancer cells. Quercetin which has another name 3,5,7,3 ', 4'-pentahydroxyflavon with the molecular formula of (C15H10O7) is a flavonoid compound which is very widely found in nature. The purpose of this study was to determine the mechanism of inhibition of overexpression of HER-2 proteins by quercetin compounds by in silico molecular docking. In silico molecular docking was carried out in several stages namely method validation, optimization of 3D quercetin compound structure, docking between quercetin compounds optimized with HER-2 protein based on bond energy parameters the lower the bond energy the stronger and the more stable the bond is. The results of docking expressed by the binding energy of quercetin compounds with HER-2 protein are -8.24 kcal / mol, while the energy of the native ligand bond with HER-2 protein is -10.45 kcal / mol. The bonding energy shows that quercetin compounds have the potential as breast anticancer because they can modulate the overexpression of HER-2 proteins. Keywords: quercetin, breast cancer, HER-2, in silico
PENENTUAN KUANTITATIF MORFIN DALAM URIN SECARA SPEKTROFOTODENSITOMETRI N. M. Suaniti; M. A. Hitapretiwi Suryadhi
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

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Abstract

Quantitative determination of morphine in urine has been done by utilizing spectrophotodensitometry.Morphine standard in methanol 5 g/mL was spotted by linomat between 4-24 L in metal sheet thin layerchromatography spectrophotodensito-metry using morphine standard of 20.40.60.80.100.120. and 140 ng.Methode. statistically and validation analysis, showed a regression line of y = -69.21 + 8.06 x with r =0.992. Detection and quantitation limits of 18.02 ng and 60.06 ng respectively were measured at maximum wavelength of (maks) 287 nm with on recovery of 90.91 percent.
SKRINING FITOKIMIA DAN UJI AKTIVITAS ANTIOKSIDAN DARI EKSTRAK ETANOL BUAH TERONG UNGU (Solanum melongena L.) Martiningsih Ni Wayan; Sukarta I Nyoman; Eppy Yuniana Putu
Jurnal Kimia (Journal of Chemistry) Vol. 8, No. 2 Juli 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 (206.883 KB) | DOI: 10.24843/JCHEM.2014.v08.i02.p01

Abstract

Phytochemical screening and antioxidant activity test of the ethanol extract of eggplant fruit (Solanum melongena L) have been done. Extraction is done by maceration method using ethanol. Phytochemical screening is done by testing the qualitative class of antioxidant compounds such as alkaloids, flavonoids, tannins, saponins, glycosides, anthraquinone, and steroids / triterpenoids. Phytochemical screening results indicate the presence of alkaloids and flavonoids. Test of the antioxidant activity of the ethanol extract of eggplant fruit with DPPH method using UV-Vis spectrophotometer resulted the DPPH antioxidant activity optimum in 29th minute and the 58th minute with a maximum wavelength of DPPH solution of 513 nm. Testing the power of antioxidants compared to ascorbic acid as a positive control showed by IC50 of 535.89 ppm in 29th minute and 385.06 ppm in 58th minute.

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