Garuda - Garba Rujukan Digital

Article Per Year (5 Year)

All

Jurnal Kimia (Journal of Chemistry)

jchem
Website

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

5 6 7 8 9

IDENTIFIKASI SENYAWA AKTIF ANTIMAKAN BIJI SIRSAK (Annona muricata L.) TERHADAP ULAT KUBIS (Plutella xylostella) Lusiana Tabuni; Sri Wahjuni; Oka Ratnayani
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

Identification of antifeedant active compounds from Soursop seeds (Annona muricata Linn) as natural pesticides against Plutella xylostella has been carried out. 1800 g Soursop seed powder maceration was applied using methanol and n-hexane resulted in 46.42 g extract of methanol and 94.19 g extract of n-hexane. Viscous extract of methanol was diluted with the mixture of methanol:water (7:3), then evaporated until the entire methanol was removed, and after that it was partitioned with chloroform. The antifeedant activity of viscous extract of n-hexane, chloroform and water was tested which showed that the extract of n-hexane had highest activity compared to the others. Separation of 2 g viscous n-hexane extract with Coloumn Chromatography using Gel Silica 60 and n-hexane:aceton (4:1) as the mobile phase resulted in 5 fractions. The fractions were tested against Plutella xyllostella. The results showed that fraction C had the highest antifeedant activity. The isolate of fraction C was then identified using Gas Chromatography-Mass Spectrometry (GC-MS) based on the data base (Database\NISTO2.L and Database\wiley7n.1) suggested the active compounds were ethyl hexadecanoate ester and 11-octadecanoic acid.

STUDI KINETIKA ADSORPSI LARUTAN ION LOGAM KROMIUM (Cr) MENGGUNAKAN ARANG BATANG PISANG (Musa paradisiaca) Ida Ayu Gede Widihati; Ni G. A. M. Dwi Adhi Suastuti; M. A. Yohanita Nirmalasari
Jurnal Kimia (Journal of Chemistry) Vol. 6, No. 1 Januari 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 (235.255 KB)

Adsorption kinetics of chromium (Cr) ion on char from banana stem has been studied. The char used in this research as obtained by pyrolisys at 4000C for 0,5 hours. The parameters studied included the surface area, which was determined by spectrophotometer UV-VIS using methylen blue method, equilibrium time, the adsorption isotherm, the adsorption capacity, the influence of pH on adsorption capacity, and the adsorption kinetics.The result showed that the surface area was 3,4559 m2/g. The adsorption capacity of banana stem (Musa paradisiaca) char on Cr6+ metal was 0,8019 mg/g, obtained at 40 minutes equilibrium time with initial concentration of Cr6+ metal (adsorption isotherm) of 75 ppm. At pH 4,00, it was obtained that the maximum adsorption capacity of the adsorbent on Cr6+ metal was 0,9088 mg/g. The adsorption followed a second-order kinetics with a rate constant of 0,0008 minute-1ppm-1

ANALISIS LOGAM SENG (Zn), BESI (Fe) DAN TEMBAGA (Cu) PADA SUSU FORMULA DENGAN METODE DESTRUKSI KERING DAN BASAH SECARA SPEKTROFOTOMETRI SERAPAN ATOM Manuntun Manurung; Ni Made Suaniti; Wira Adi Capayanti
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

Analisis kandungan logam Zn, Fe, dan Cu dalam susu formula dengan metode destruksi kering dan basah telah dilakukan. Konsentrasi logam dalam susu ditentukan dengan metode spektrofotometri serapan atom menggunakan kurva kalibrasi. Persentase perolehan kembali dari metode kurva kalibrasi terhadap ketiga logam menunjukkan hasil yang baik, masing-masing 95,13% untuk Zn; 100,83% untuk Fe dan 99,39% untuk Cu. Konsentrasi logam Zn, Fe, dan Cu dalam susu formula A, B, dan C dengan metode destruksi kering dan basah berturut-turut; sampel A yaitu 79,14 mg/kg; 78,37 mg/kg; 3,40 mg/kg dan 80,98 mg/kg; 78,83 mg/kg; 1,92 mg/kg, sampel B yaitu 58,65 mg/kg; 94,01 mg/kg; 3,87 mg/kg dan 57,73 mg/kg; 89,09 mg/kg; 2,77 mg/kg, serta sampel C yaitu 45,41 mg/kg; 76,16 mg/kg; 2,96 mg/kg dan 38,62 mg/kg; 60,53 mg/kg; 2,92 mg/kg. Kandungan ketiga logam dalam susu formula tersebut masih pada rentang standar kesehatan makanan.

PEMBUATAN DAN KARAKTERISASI ARANG AKTIF DARI BAMBU APUS (Gigantochloa apus) DENGAN AKTIVATOR H3PO4 M. Manurung; E. Sahara; P. S. Sihombing
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

This paper discusses the manufacture and characterization of activated carbon from bamboo apus (Gigantochloa apus) with H3PO4 activator. The aims of study were to determine the optimum carbonization temperture and time as well as the amount of phosphoric acid required as the chemical activator. In addition, the activated carbon was also characterized following the Indonesian National Standard (SNI-1995) for activated carbon. Tthe activated carbon functional groups was determined using FTIR spectroscopy. The result showed that the optimum temperature of carbonization was 600oC, the carbonization time was 90 minutes and the phosphoric acid required was 20 gram for 1 gram carbon. Under these conditions, the activated carbon resulted met SNI-1995 with the characteristics as follows: the water content was (1.11±0.83%), the level of volatile substances was (8.13± 0.27%), the total ash amount was (7.33±1.35%), the carbon contents was (83.40±0.27%). and the absorption capacities of iodine and methylen blue were of 1057.75 mg/g, 472.88 mg/g, respectively. FTIR identification indicated the existence of some functional groups, namely aromatik, ketone, and hydroxyl.

KOMBINASI BAHAN ORGANIK (RASIO C:N) PADA PENGOLAHAN LUMPUR (SLUDGE) LIMBAH PENCELUPAN Ida Ayu Ary Pramaswari; I Wayan Budiarsa Suyasa; Anak Agung Bawa Putra
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 (217.495 KB)

A research on the Combination of Organic Matter (the ratio of C:N) in the Sludge Treatment of dying waste has been conducted. The sludge was mixed with organic matter wich were dried leaves and dung in various compositions. The compositions (sludge : organic matter) made were 3 : 7, 1 : 1, and 7 : 1.In this research it was found that the first composition contained the highest organic matter (the lowest C : N = 28.05/1) and showed the best effect to the composting process indicated by physical characteristics. The Compost with the lowest ratio C:N (17,71/1) gave the best total N, organic C, available K, and available P contents which were 0.98%; 17.90 %; 22,092.1894 ppm; and 568.2312 ppm respectively. All composts had organic C and total N that meet the SNI 19-7030-2004, and high available P and K contents. These were in agreement to the evaluation of fertility analysis. More over, all compost showed physical caracteristic such as temperature, colour, texture, and odour that are in agreement to those of SNI 19-7030-2004. Unfortunately the pH did not meet the SNI 19-7030-2004.

PENINGKATAN POTENSI BATU PADAS LADGESTONE SEBAGAI ADSORBEN ION LOGAM BERAT Cr(III) DALAM AIR MELALUI AKTIVASI ASAM DAN BASA N. P. Diantariani
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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (118.605 KB)

The research with aim to increase potency of natural batu padas of Ladgestone type through activation usedby acid (H2SO4) and basa (NaOH) various concentrations (2.0; 4.0; and 6.0N) to adsorption ability of heavy metalion of Cr(III) in water have been done. Acid and base activated batu padas was characterizated of specific surfacearea with blue methylen method, whereas surface acidity determined by acid-base titration. Whereas, amount ofCr(III) which can of maximum adsorpted every weight of adsorben or adsorption capacity determined by atomicabsorption spectrophotometer (AAS). The result measurement of activated batu padas compared by batu padaswithout activation (control).Result of research indicate that batu padas after activated by NaOH and of H2SO4 yield surface acidity(active sites) and realtive higher specific surface area compared with without activation (control). Maximumability(capacity) adsorption to Cr(III) was just increasing for NaOH activated batu padas. Highest Capacitiesobtained by NaOH activated batu padas at concentration 4.0N was 2.0265 mg/g.

IMOBILISASI DIFENILKARBAZIDA PADA SILIKA GEL DARI ABU SEKAM PADI MELALUI TEKNIK SOL GEL Lestina Sari; I Wayan Sudiarta; Anak Agung Bawa Putra
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

The research was conducted to observe diphenylcarbazide immobilization on silica gel from rice husk ash (Si-CPTMS-DPZida) with sol-gel technique. The aim of this research was to modify silica gel from rice husk ash by immobilization with diphenylcarbazide using sol-gel technique. This research included the modification and characterization of silica gel. The characterizations of silica gel were done by using infrared spectrophotometer (FTIR) and X-ray diffraction (X-RD). The results showed that the immobilized diphenylcarbazide silica has been formmed which is indicated by the appearance of Si-OH functional group in the peak at wave number 914,26 cm-1, Si-O-Si at 1091,71 cm-1, the stretching vibration of NH group at 3645 cm-1 and proved in 1492 cm-1 which is the bending vibrations of the NH group, CH (aromatic) at 802.39 cm-1, vibrational bending C = C (aromatic) at 1612 cm-1, vibration CN group at 1310 cm-1, and the vibrations of the C = O group in the area of 1685 cm-1. The X-RD data showed that the structure of Si-CPTMS-DPZida is amorphous.

SINTESIS KOMPOSIT SELULOSA-POLIPROPILENA DENGAN REAGEN FENTON SEBAGAI AGEN PENGKOPLING I Nengah Simpen; I Made Sutha Negara
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

The research was conducted to observe of mixture ratio of cellulose from eceng gondok, concentrations of H2O2/Fe2+ (Fenton reagent), and concentrations of polypropylene from plastic garbage wich produced optimum condition to composite production with strong mechanics and biodegradable properties. This research was conducted by determination of optimum condition in composite forming of cellulose-PP. Steps performed within forming of cellulose-PP were (1) purification of plastic garbage to get polypropylene (PP); (2) cellulose extraction of from enceng gondok by alkaline extraction; continued with (3) composite forming of cellulose-PP through reaction of free radical with Fenton reagent as insiator. Determination of optimum conditions for the formation of cellulose-PP composite was conducted by varying some variables influencing the properties of mechanicals and biodegradability of cellulose-PP composite that is concentration ratio between cellulose and PP and concentration of H2O2. Composite of cellulosa-PP to be tested by mechanicals properties (elasticity modulus (MOE), breaking modulus (MOR), and density and also its ability of water absorption test and biodegradability test on dry land and wet land. The result gave optimum ratio of 1:3 and optimum concentration of H2O2 of 0.5%. Analysis of Laser Induced Breakdown Spectroscopy (LIBS) showed that the hardness of EG-PP was higner than with plastic PP and that insertion of cellulose molecule in composite was successful. Its optimum conditionthe EG-PP composite can adsorp 18.73% water and biodegradable properties.

KANDUNGAN FORMALIN PADA IKAN BANDENG (Chanos chanos) DI PASAR TRADISIONAL DAN MODERN DI DENPASAR Dewi Novita Hardaningsih; Ketut Gede Dharma Putra; I Wayan Suirta
Jurnal Kimia (Journal of Chemistry) Vol. 11. No.2 Juli 2017
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

Telah dilakukan analisis kandungan formalin pada ikan bandeng di pasar tradisional dan modern di Denpasar. Ikan bandeng (Chanos chanos) diambil pada 4 lokasi yang berbeda dengan 2 lokasi di pasar tradisional dan 2 lokasi di pasar modern. Kandungan formalin dalam sampel dianalisis dengan alat spektrofotometri UV-Vis. Hasil analisis menunjukkan adanya kandungan formalin pada ikan bandeng. Konsentrasi formalin pada ikan bandeng sampel A dan B berturut-turut sebesar 15,16 ppm dan 13,44 ppm sedangkan pada sampel C dan D berturut-turut sebesar 21,85 ppm dan 15,71 ppm.

EKSTRAKSI KATEKIN DARI BIJI ALPUKAT DENGAN VARIASI PELARUT MENGGUNAKAN METODE MASERASI I K. N. Sanjaya; N. K. M. Giantari; M. D. Widyastuti; 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

Avocado is one of the fruits favored by many people because of the avocado's taste and content. Avocados contain antioxidants and nutrients such as fat which is 9.8 g / 100 g of fruit flesh. But until now, the use of avocados is still focused on the fruit while other parts such as seeds are underutilized. Catechins are flavonoid compounds contained in avocado seeds. Extraction of catechins in avocado seeds was carried out by maceration method, namely immersion using three variations of solvents namely ethyl acetate, 95% ethanol, and acetone for 24 hours. The results of maceration were filtered and then remaserated for 24 hours to obtain more filtrate, then concentrated with an evaporator rotary vaccum to obtain thick extracts of avocado seeds which were then tested using the TLC-Densitometry method. The results obtained were the highest levels of catechins obtained in maceration using ethyl acetate solvents, with levels of 25.55% b / b. Keywords: avocado seeds, catechins, maceration

Page 7 of 52 | Total Record : 518

5 6 7 8 9

Filter by Year

2007 2024

Filter By Issues

All Issue Vol. 18, No.2, Juli 2024 Vol. 18, No.1, Januari 2024 Vol. 17, No.2, Juli 2023 Vol. 17, No.1, Januari 2023 Vol. 16, No.2, Juli 2022 Vol. 16, No.1, Januari 2022 Vol. 15, No.2, Juli 2021 Vol. 15, No.1, Januari 2021 Vol. 14, No. 2 Juli 2020 Vol.14 No.1 Januari 2020 Vol.13 No.2 Juli 2019 Vol.13 No.1 Januari 2019 Vol.12 No.2 Juli 2018 Vol. 12 No.1 Januari 2018 Vol. 11. No.2 Juli 2017 Vol. 11. No. 1 Januari 2017 Vol. 10, No. 2 Juli 2016 Vol. 10, No. 1 Januari 2016 Vol. 9, No. 2 Juli 2015 Vol. 9, no. 1 Januari 2015 Vol. 8, No. 2 Juli 2014 Vol. 8, No. 1 Januari 2014 Vol. 7, No. 2 Juli 2013 Vol. 7, No. 1 Januari 2013 Vol. 6, No. 2 Juli 2012 Vol. 6, No. 1 Januari 2012 Vol. 5, No. 2 Juli 2011 Vol. 5, No. 1 Januari 2011 Vol. 4, No. 2 Juli 2010 Vol. 4, No. 1 Januari 2010 Vol. 3, No. 2 Juli 2009 Vol. 3, No. 1 Januari 2009 Vol. 2, No. 2 Juli 2008 Vol. 2, No. 1 Januari 2008 Vol. 1, No. 2 Juli 2007 Vol. 1, No. 1 Januari 2007 More Issue

Home Page

OAI Link

Editorial Team

Contact

Reviewer

Google Scholar

Contact Name
Ni Putu Diantariani

Contact Email
jurnalkimia@unud.ac.id

Phone
+628123640424

Journal Mail Official
jurnalkimia@unud.ac.id

Editorial Address
Program Studi Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Udayana Kampus Bukit Jimbaran, Jimbaran, Bali, Indonesia

Location
Kota denpasar,

Bali

INDONESIA

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Home Page

OAI Link

Editorial Team

Contact

Reviewer

Google Scholar

Contact Name Ni Putu Diantariani

Contact Email jurnalkimia@unud.ac.id

Phone +628123640424

Journal Mail Official jurnalkimia@unud.ac.id

Editorial Address Program Studi Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Udayana Kampus Bukit Jimbaran, Jimbaran, Bali, Indonesia

Location Kota denpasar, Bali INDONESIA

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Contact Name
Ni Putu Diantariani

Contact Email
jurnalkimia@unud.ac.id

Phone
+628123640424

Journal Mail Official
jurnalkimia@unud.ac.id

Editorial Address
Program Studi Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Udayana Kampus Bukit Jimbaran, Jimbaran, Bali, Indonesia

Location
Kota denpasar,

Bali

INDONESIA