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NOOR HUBDRYAWATI
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Jurnal Kimia Mulawarman
Published by Universitas Mulawarman
ISSN : 16935616     EISSN : 24769258     DOI : DOI: https://doi.org/10.30872/jkm
Core Subject : Science,
Chemistry
Journal of Kimia Mulawarman is a peer-reviewed, open access journal that publishes original research articles, review articles, as well as short communication in all areas of chemistry, including educational chemistry and applied chemistry.
Arjuna Subject : Kimia(semua kategori) - Kimia (Lain-Lain)
Articles 224 Documents
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PEMBUATAN BIOETANOL MELALUI FERMENTASI NIRA TEBU (Saccharum officinarum) MENGGUNAKAN Saccharomyces cerevisiae DENGAN PENAMBAHAN VITAMIN B KOMPLEKS SEBAGAI NUTRISI FERMENTASI Wahyu Budi Utama; Rudi Kartika; Erwin -
JURNAL KIMIA MULAWARMAN Vol 13 No 2 (2016)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Bioethanol is alternative energy produced from the fermentation of carbohydrates like sugar cane juice. The fermentation process is influenced by several factors like nutrition of fermentation. This research to determine the addition weigh (g) of vitamin B complex gr and time of fermentation as theoptimumconditions of fermentaced toproduceethanol with high concentrations. Sugar cane juice as raw material fermented using Saccharomyces cereviceaea with variation additional of vitamin B complex are 0%; 0.1%; 0.2%; and 0.3% (w/v) sugar cane juice fermented during time of fermentation with the variation are 6 day, 7 day and 8 day. Purification of bioethanol by process of distillation.Alcohol content analysis using gas chromatography. The results showed optimumconditions of fermentaced are addition of Vitamin B complex is 0.1% (w/v) and time of fermentation is 7 days to produced ethanol 30.177%.
Rice Husk Silica-Coated Magnetic Particles As A Low Cost Support Material For Crude Pseudomonas Aeruginosa Lipase Immobilization Noor Hindryawati
JURNAL KIMIA MULAWARMAN Vol 14 No 1 (2016)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

In this research, lipase produced from the bacteria Pseudomonas aeruginosa was immobilized on rice husk silica-coated Fe3O4 nanoparticles. The process included the following steps: preparation of magnetic ferrosoferric oxide nanoparticles (NP), coating NP with silica from rice husk ash, activation with glutaraldehyde and covalent immobilization of lipase on the support. The synthesis of the nanoparticle was followed by characterization through FT-IR, XRD, and FE-SEM. The hydrolysis kinetics (using 4-Nitrophenyl palmitate as a substrate) of the immobilized lipase followed Michaelis-Menten model with a Vmax and a Km value of 4.0 mM.s-1 and 0.63 mM, respectively. The immobilized lipase showed better tolerance to extreme temperature and pH compared to free lipase. About 60% of enzyme remained immobilized after ten cycles of reuse and 68.13% of it were stable until 49 days. Thus the silica-coated Fe3O4 nanoparticles appeared to be a potential support material for lipase immobilization applications.
ANALISIS KANDUNGAN KAFEIN DALAM KOPI SUMATERA DAN KOPI FLORES DENGAN VARIASI SIKLUS MENGGUNAKAN SPEKTROFOTOMETER UV-VIS Nadhirah -; Alimuddin -; Chairul Saleh
JURNAL KIMIA MULAWARMAN Vol 13 No 1 (2015)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

The research about analysis of caffeine content on coffee Sumatera and coffee Flores with cycle variations using spectrophotometer UV-Vis has been done. Coffee extract obtained through soxhletation with ethanol 96% and variation cycles used is 3, 6, 9, 12 and 15. The extract obtained is dissolved in ethanol 96% and tested with spectrophotometer UV-Vis at a wavelength of 272 nm. The result obtained in this research is the caffeine content in coffee Sumatera for 3, 6, 9, 12, 15 cycles consecutive are 0.582 mg/L; 0.986 mg/L; 1.315 mg/L; 2.143 mg/L and 2.918 mg/L. While the caffeine content obtained coffee Flores for 3, 6, 9, 12, 15 cycles consecutive are 0.465 mg/L; 0.599 mg/L; 0.728 mg/L; 1.186 mg/L and 1.653 mg/L.Keywords : Coffee Sumatera, Coffee Flores, Ethanol 96%, Soxhletation, Caffeine, Spectrophotometer UV-Vis
UJI FITOKIMIA, TOKSISITAS DAN AKTIVITAS ANTIBAKTERI dari EKSTRAK BERBAGAI FRAKSI DAUN MAHANG (Macarang apruinosa (Miq.) Mull. Arg.) terhadap BAKTERI Escherichia coli dan Staphylococcus aureus Mustafidah -; Chairul Saleh; Alimuddin -
JURNAL KIMIA MULAWARMAN Vol 12 No 2 (2015)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Phytochemical, toxicity and antibacterial activity tests of total extract, fractions of n-heksana, ethyl acetate and ethanol-water from mahang leaf (Macaranga pruinosa (M.) M. A.) from KRUS (Kebun Raya Unmul Samarinda), East Kalimantan has been carried out. Based on the secondary metabolites phytochemical test of the (Macaranga pruinosa (M.) M. A.) leaf show that total extract is contain alkaloid and steroid. n-hexane fraction is contain alkaloid and steroid. Ethyl acetate fraction is contain steroid. Ethanol-water fraction is contain alkaloid and phenolic. Brine shrimp lethality test values obtained Lethal Concentration 50 % (LC50) total extract 27,5036 ppm , n-heksana fraction 12,0773 ppm, ethyl acetate fraction 23719,2305 ppm and ethanol-water fraction 250,0384 ppm. Antibacteria activity test of extracts for Staphylococcus aureus bacteria (positive Gram) and Escherichia coli (negative Gram) minimum inhibitor consentration of 0-1 % (b/v) from extract fractions of n-heksana and fractions ethyl acetate for Staphylococcus aureus bacteria and fractions ethyl acetate for Escherichia coli bacteria.Keywords (Macaranga pruinosa (M.) M. A.), phytochemical test, Antibacteria activity test, LC 50 .
PHENOL ADSORPTION USING COMPOSITE ADSORBENT Fe3O4-ACTIVATED CHARCOAL COFFEE GROUNDS Elen Reknosari; Teguh Wirawan; Soerja Koesnarpadi
JURNAL KIMIA MULAWARMAN Vol 18 No 1 (2020)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/jkm.v18i1.923

Abstract

ABSTRACT Phenol adsorption using composite adsorbent Fe3O4-activated charcoal coffee grounds has been done. Composite adsorbent Fe3O4 -activated charcoal coffee grounds are synthesized from FeSO4. 7H2O and FeCl3. 6H2O with a ratio of 3: 2 and then compiled with activated coffee charcoal. The composite adsorbent Fe3O4-activated coffee charcoal was characterized by Fourier Transform Infared (FTIR) and Scanning Electron Microscopy (SEM) as well as the adsorption test on phenol. The results of the characterization with Fourier Transform Infared (FTIR), peak 1604.77 cm-1 appeared showing the absorption of C=O which states that coffee grounds have formed carbon. Beside that, Fe3O4-activated charcoal composite adsorbent peaks appear at a wavelength of 509.21 cm-1 which is a Fe-O group showing that Fe3O4 nanoparticles have been successfully grafted on the active charcoal structure. The optimum conditions of phenol adsorption using adsorbent composite Fe3O4-activated coffee grounds at 30 minutes contact time and pH 5. Keywords: Adsorption, Phenol, Magnetite, Active Charcoal, Coffee Grounds
STUDI KOMPUTASI REAKSI ADSORBSI DISOSIASI GAS O2 PADA PERMUKAAN Pt-Fe DENGAN METODE TEORI FUNGSI KERAPATAN Darmin -; Rahmat Gunawan; Aman Sentosa Panggabean
JURNAL KIMIA MULAWARMAN Vol 10 No 2 (2013)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Platinum purpose as a catalysts on the cathode in a fuel cell hydrogen system gets a role in disconnection of O2 molecules. Power adsorption and dissociation of O2 molecules determined the effectiveness and efficiency of the nature of catalyst that is utilized. All this time metal is considered the most effective as a catalyst in fuel cells hydrogen is Pt. After be done investigation and calculation is known about platinum and iron alloy (Pt-Fe) can be utilized as a catalyst that has approached the effectiveness and efficiency of pure Pt metal. One of the way to determine the effectiveness and efficiency of the catalyst Pt-Fe alloys by calculating the value of the potential energy surface (PES). PES value calculation is done using density functional theory calculations. Analysis’s result point out the value of the potential energy surface (PES) O2 molecules in the Pt-Fe metal fusion for -929.8341 Ry with optimal distance of 2.4908 A of Pt-Fe’s metal surface and distances among O atoms as big as 3.3211 A.Keywords: Fuel cell hydrogen, Adsorption dissociation O2, PES, Density functional theory (DFT)
Studi Molekul Kitosan Sebagai Membran Penghantar Proton (H) Dengan Metode Ab Initio Arif Ari Wibowo; Rahmat Gunawan; Saibun Sitorus
JURNAL KIMIA MULAWARMAN Vol 17 No 1 (2019)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/jkm.v17i1.462

Abstract

The aim of this research to know chitosan compound able to replace nafion performance as a conductor of proton (H+). The assessment process and computational chemistry calculations done using ab initio methods. The analysis showed chitosan energy is -1384.7601 eH and chitosan energy after bringing proton (H +) decreased respectively by -1385.2275 eH, -1385.8487 eH, -1386.3393 eH, -1386.9652 eH, -1387.4508 eH. The result obtained proved of chitosan becomes stable so that it can be used as a proton conductor.
UJI FITOKIMIA DAN UJI TOKSISITAS EKSTRAK DAUN GAMAL (Gliricidia sepium) SEBAGAI INSEKTISIDA NABATI Ajeng Kartini; Daniel Daniel; Chairul Saleh
JURNAL KIMIA MULAWARMAN Vol 15 No 1 (2017)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/jkm.v15i1.399

Abstract

Research on phytochemical test and toxicity tests of leaf extract of Gliricidia (Gliricidia sepium) as an insecticide plant have been conducted.. Gliricidia leaves macerated dried samples using ethanol and fractionated using a solvent n-hexane and ethyl acetate. Phytochemical test showed that it contains alkaloids, steroids, triterpenoids, phenolic and flavonoid in total extract. N-hexane fraction containing steroids, triterpenoids and the phenolic. Ethyl acetate fraction containing steroids, triterpenoids, flavonoids, phenolic and saponin. Toxicity test method Brine Shrimp Lethality Test (BSLT) showed that the ethyl acetate fraction had the highest toxicity on shrimp larvae with LC50 values ​​of 49.29 ppm. Test Activity as an insecticide plant conducted in animal infestation of rice (Sitophylusorizae Leach) Value LC50 is determined using a regression line between log concentration and probit mortality, the LC50 obtained is 2.831%. Analysis of the content of chemical compounds in the ethyl acetate fraction from the leaves of Gliricidia produces 9 peak component compounds at mass spectra are shown from the results of GC-MS with 2 peaks compound dominant that serves as an insecticide plant them 2-(3H)-Benzofuranone, 3-methyl and dl-Limonene
PEMANFAATAN ARANG AKTIF DARI TEMPURUNG Jatropha curcas L. YANG TERMODIFIKASI SEBAGAI ADSORBEN LOGAM TEMBAGA (Cu) Teguh Wirawan
JURNAL KIMIA MULAWARMAN Vol 8 No 1 (2010)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

A research on the application of activated carbon from Jatropha curcas L shell which is modified as the copper adsorbent has been conducted. The research was varied by series of initial pH 1, 2, 3, 4, and 5 and the contact time 15, 30, 60, 90, and 120 minutes and its effect to copper adsorption by activated and modified carbon from Jatropha curcas L shell. The result showed that the optimum pH for AA-FISIK, AA-EDTA and AA-HNO3 is 3 and for AA-HCl is 5. The optimum contact time is 90 minutes for AA-HCL and AA-EDTA; 60 minutes for AA-HNO3; and 120 minutes for AA-PHYSICAL. It was also found that higher initial concentration will increase the total amount of adsorbed copper.Keywords: adsorption, copper, activated carbon, Jatropha curcas L
Perhitungan komputasi potensi Lawsone dan turunannya sebagai material aktif pada sel surya tersensitisasi zat warna Mirella Fonda Maahury; Muhamad Abdulkadir Martoprawiro
JURNAL KIMIA MULAWARMAN Vol 17 No 1 (2019)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/jkm.v17i1.846

Abstract

Lawsone is a dye which found in henna plant. Computational calculations have been done for the lawsone and its derivatives. This computational calculation aims to obtain a stable optimized structure and electronic properties to predict potency of lawsone as a photosensitizer in dye sensitizer solar cell. Computational calculation were using DFT for geometry optimization ground state and TDDFT for single point calculation excitation state. Both state for calculation using B3LYP functional and 6-311G(d,p) as basis set. The calculation in gas phase. Geometry optimization obtain lawsone structure is planar. The present of functional methoxy and hydroxy causing decresing and increasing of bond length. Based on electronic properties, such as excitation energy, maximum absorption wavelength and percentage excitation, L0 has better potential as active material in dye sensitized solar cell.

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