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NOOR HUBDRYAWATI
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jurnalkimiaunmul@gmail.com
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Jl.Barong Tongkok no.04 Kampus Gn.kelua Samarinda Kalimantan Timur
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INDONESIA
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 11 Documents
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Search results for , issue "Vol 14 No 1 (2016)" : 11 Documents clear
Uji Fitokimia, Toksisitas dan Aktivitas Antioksidan Fraksi n-heksan dan Etil Asetat terhadap Ekstrak Jahe Merah (Zingiber officinale var. amarum) Alpina Nora Kaban; Daniel Tarigan; Chairul Saleh
JURNAL KIMIA MULAWARMAN Vol 14 No 1 (2016)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Has conducted research on the phytochemical test, toxicity test and test the antioxidant activity of the fraction of n-hexane and ethyl acetate to extract red ginger (Zingiber officinale amarum var.). The dried leaves weighing 382 grams, was macerated using methanol, filtered and concentrated by rotary evaporator. Then the total extract of red ginger in fractionation with n-hexane and ethyl acetate. Based on the test results of secondary metabolites phytochemical extracts of total red ginger (Zingiber officinale var amarum.) Are alkaloids, flavonoids, triterpenoids and phenolic. N-hexane fraction contains alkaloids, flavonoids, steroids, triterpenoids and phenolic. Ethyl acetate fractions contain alkaloids, flavonoids, triterpenoids and phenolic. Toxicity test showed the mortality rate of shrimp larvae Artemia salina Leach using Probit Analysis SAS (Statistical Analysis System) to determine the value of 50% Lethal Concentration (LC50), showed that the fraction of n-hexane toxicity with LC50 values of 63.8130 ppm; extracts of total was 71.0121 ppm and ethyl acetate was 3821.89 ppm. Test the antioxidant activity using DPPH free radical reduction in the spectrophotometer and IC50 values obtained on a total extract was 32.19 ppm; n-hexane was fraction 35.63 ppm; and ethyl acetate fraction was 25.69 ppm.
UJI TOKSISITAS (Brine Shrimp Lethality Test) DAN AKTIVITAS ANTIOKSIDAN DARI DAUN SINTRONG (Crassocephalum Crepidioides) DENGAN METODE 2,2-diphenyl-1-picrylhidrazil (DPPH) Fiktor Boni Pasilala; Daniel Tarigan; Chairul Saleh
JURNAL KIMIA MULAWARMAN Vol 14 No 1 (2016)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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The phytochemical test, brine shrimp lethality test and antioxidant activity test on secondary metabolits of terap (Artocarpus odoratissimus B.) leaves has been completed. The leaves samples are extracted by masseration method that is concentrated by using rotary evaporator. The total extract are fractioned with n-hexane and ethyl acetate. Based on secondary metabolits phytochemical test of terap (Artocarpus odoratissimus B.) leaves showed that total extract and Ethyl Acetat fraction extract contains alkaloids, phenolics, flavonoids, saponins, steroids and triterpenoids. N-hexane fraction extract contain alkaloids, steroids and tritepenoids. In brine shrimp lethality test, the increase larvae death data was recorded and processed using SAS Probit Analysis to determine the Lethal Concentration 50 % (LC50) value. The results of this test showed that the most active extract is metanol extract with LC50 value of 88.0227 ppm. Based on the antioxidant activity by scavenging activity of DPPH used spectrophotometry was obtained that Inhibition Concentration 50% (IC50) of total extract is 369.0833 ppm, extract of n-hexane fraction is 1532.267 ppm and extract of ethyl acetat fraction is 82.89003 ppm.
Uji Fitokimia, Toksisitas Serta Antioksidan Ekstrak Propolis Pembungkus Madu Lebah Trigona Incisa Dengan Metode 2,2-Diphenyl-1-Picrylhidrazyl (Dpph) Aswin Thamrin; Erwin -; Syafrizal -
JURNAL KIMIA MULAWARMAN Vol 14 No 1 (2016)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Phytochemical test, test the mortality of larvae shrimp (Brine Shrimp Lethality Test) and test the antioxidant activity of secondary metabolites extract of propolis Trigona Incisa been done. Based on the test results of phytochemical screening of secondary metabolites contained in propolis extracts showed that the crude extract contains phenolic compounds and alkaloids. Ethanol fraction containing alkaloids and phenolic compounds. Ethyl acetate fraction containing alkaloid compounds. Mortality of shrimp larvae test performed to determine the toxicity values propolis extract obtained values of 50% Lethal Concentration (LC50) at 249.6079 ppm for ethanol fraction as the most active fraction. Based on the test of antioxidant activity with DPPH values obtained Inhibition Concentration 50% (IC50) in the crude extract of 139.47 ppm ethanol, ethanol fraction at 109.44 ppm, 91.42 ppm ethyl acetate fraction and vitamin C amounted to 59.44 ppm , It can be stated that the most active fraction is the fraction of ethyl acetate with IC50 value of 91.42 ppm..
PEMBUATAN DAN KARAKTERISASI MEMBRAN SELULOSA ASETAT-PVC DARI ECENG GONDOK (Eichhornia crassipes) UNTUK ADSORPSI LOGAM TEMBAGA (II) Nazaratun Thaiyibah; Alimuddin Alimuddin; Aman Sentosa Panggabean
JURNAL KIMIA MULAWARMAN Vol 14 No 1 (2016)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Penelitian tentang isolasi selulosa dari eceng gondok (Eichhornia crassipes) melalui proses ekstraksi sokletasi, delignifikasi dan bleaching, dilanjutkan dengan sintesis asetilasi dengan memasukkan gugus asetat ke dalam gugus fungsi selulosa hasil isolasi telah dilakukan. Membran selulosa asetat-PVC dibuat dengan mencampurkan selulosa asetat dengan polivinilklorida (PVC) sebagai matriks yang terlebih dahulu dilarutkan dengan pelarut tetrahidrofuran (THF), kemudian ditambahkan dioktilftalat (DOP) sebagai pemlastis. Hasil penelitian menunjukkan bahwa eceng gondok dapat dimanfaatkan menjadi membran selulosa asetat-PVC dengan komposisi optimum pada perbandingan selulosa asetat : PVC : DOP yaitu 6:3:1. Hasil analisis FT-IR menunjukkan adanya interaksi antar ion Cu2+ dengan membran dilihat dari penurunan intensitas serapan sebelum dan sesudah didop yaitu 78.564 % menjadi 66.857 %  pada gugus C=O dari selulosa asetat. Hal ini diperkuat dengan analisis SEM yang menunjukkan morfologi permukaan membran yang porinya diduga terisi oleh ion logam Cu2+. Kata Kunci : Eceng gondok, Membran selulosa asetat-PVC, Tembaga (II) 
Optimasi Suhu Reaksi Transesterifikasi Pada Minyak Jerami Padi (Oryza sativa L.) Menjadi Biodiesel Dengan Menggunakan Katalis CaO Dari Kulit Telur Ayam) Tasik Sinta; Daniel Tarigan; Chairul Saleh
JURNAL KIMIA MULAWARMAN Vol 14 No 1 (2016)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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The research on optimization of transesterification temperature for production of biodiesel from rice straw oil (Oryza sativa L.) using CaO catalyst derived from the chicken egg skin has been conducted. Production of biodiesel was conducted at varied temperatures, namely 30oC, 40oC, 50oC, 60oC and 70oC. The fatty acid compositions of the transesterification products were determined by using GC-MS and the physical and chemical characteristics were determined using SNI Methods 04-7182-2006. The AAS result suggested that the chicken egg skin contained 91.41% CaO. The optimum transesterification temperature was 60oC producing 90,8405% methyl ester. The results of GC-MS showed that the highest percentage of fatty acid was methyl oleic (44.56%).
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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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.
Isolasi dan Identifikasi Senyawa Kimia dari Ekstrak n-heksan Batang Benalu Tanaman Jeruk (Dendrophtoe pentandra (L.) Miq.) rizky maulida amalia hanif; Rudi Kartika; Partomuan Simanjuntak
JURNAL KIMIA MULAWARMAN Vol 14 No 1 (2016)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Telah dilakukan penelitian isolasi dan identifikasi senyawa kimia dari ekstrak n-heksan batang benalu tanaman jeruk (Dendrophtoe pentandra (L.) Miq.). Penelitian ini dilakukan dengan metode maserasi dengan pelarut n-heksan, etil asetat, etanol dan air, uji fitokimia, uji mortalitas larva udang dengan metode BSLT (Brine Shrimp Lethality Test) serta isolasi dengan kromatografi kolom dan identifikasi dengan menggunakan spektrofotometer Fourier Transform Infra Red (FT-IR) dan Kromatografi Gas – Spektrometri Massa (KG-SM). Dari hasil uji mortalitas larva udang didapatkan bahwa ekstrak n-heksan adalah ekstrak yang paling aktif kemudian dilanjutkan pada proses isolasi dan diperoleh isolat n-heksan 3.2 yang memiliki nilai toksisitas (LC50) sebesar 92,197 ppm. Berdasarkan hasil analisis dengan spektrofotometer FT-IR dan KG-SM senyawa kimia yang diduga terdapat dalam ekstrak n-heksan batang benalu tanaman jeruk (Dendrophtoe pentandra (L.) Miq.) adalah senyawa Stigmasterol.
KAJIAN PERUBAHAN UKURAN RONGGA ZEOLIT RHO BERDASARKAN VARIASI RASIO Si/Al DAN VARIASI KATION ALKALI MENGGUNAKAN METODE MEKANIKA MOLEKULER Wahdana Kusuma Sari; Rahmat Gunawan; Erwin Erwin
JURNAL KIMIA MULAWARMAN Vol 14 No 1 (2016)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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The structure modeling of zeolite RHO with variation of Si/Al ratio (5; 4.33; 3.8; 3.36; 3; 2.69; 2.43; 2.2; 2) and variation of alkaline cations (Li+, Na+, K+, Rb+, Cs+, Fr+) calculated by the molecular mechanics method has been investigated. The result shows that the structure of zeolite RHO with Si/Al ratio 3.36 has the most stable structure with a minimum energy 2652.0308 kcal/mol. The most stable structures of zeolite RHO impregnated with cation is that impregnated with Fr+ (alkaline) with a minimum energy 3006.6587 kcal/mol. The result shows that the zeolite RHO structure with cations Fr+ (alkaline) has the largest pore diameter which potentially has the best adsorption capacity.
ANALISIS KANDUNGAN ASAM ASKORBAT DALAM BUAH NAGA MERAH (Hylocereus polyrhizus) DENGAN IODIMETRI Abdul Rahim; Alimuddin Alimuddin; Erwin erwin
JURNAL KIMIA MULAWARMAN Vol 14 No 1 (2016)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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ABSTRACT             The research to determine “Analysis the Content of Ascorbic Acid in the Red Dragon Fruit by Iodimetri” Vitamin C concentration of postharvest red dragon fruit (Hylocereus Polyrhizus) and at the same time to recognize those the packaging could affected conten of obtained Vitamin C. Analysis process was conducted by iodimetric titration method through the sample of dragon fruit with saving period and packaging varied. The result of completed research find out there was are difference concentration of Vitamin C between packaged dragon fruit and without package, the concentration of Vitamin C in packaged dragon fruit was increase the concentration of Vitamin C from the first day (11,1680 mg/100 gram of sample) to the third day (14,8017 mg/100 gram of sample) and decrease until the fifth day (10,4743 mg/gram of sample), otherwise by another treatment without package the concentration of Vitamin C are increase from the first day (7,4928 mg/100 gram of sample) to the sixth day (19,6784 mg/100 gram of sample) and decreased until the eighth day (14,1395 mg/100 gram of sample). Keywords  : Red dragon fruit (Hylocereus Polyrhizus), Vitamin C dan iodimetric titration.
Penurunan Kadar Cr+3 [Kromium(III)] dan TSS (Total Suspended Solid) Pada Limbah Cair Laboratorium Dengan Penggunaan Metode Presipitasi Isma Avessa; Bohari Yusuf; Alimuddin Alimuddin
JURNAL KIMIA MULAWARMAN Vol 14 No 1 (2016)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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The aims of this research was to decrease the level chromium and TSS in the laboratory wastewater liquid sample PT SUCOFINDO by using calcium hydroxide and sodium hydroxide. Precipitation process was done by reacting the wastewater sample and solution Ca(OH)2 0,2 and NaOH 1 M at pH variation 7, 8, 9, 10 and 11, then allowed to settle for 24 hours and established the optimal pH at both solution was used in the precipitation process. Analysis content of Cr metal at this research using AAS instrument and analysis for content of TSS in this research using gravimetric method. The optimal pH precipitation to decrease Cr metal and TSS level is 8 in each of the solution used. Cr metal level after precipitation using Ca(OH)2 solution at pH 8 is 0.0901 mg/L and TSS level is 0.005 mg/L. Cr metal level after precipitation using NaOH at pH 8 is 0.0935 mg/L and TSS level is 0.008 mg/L. If compared with level decrease of Cr metal and TSS in laboratory wastewater using Ca(OH)2 and NaOH solution, and found the effectiveness of solution that have better efficiency to reduce levels of Cr and TSS in the low concentration is calcium hydroxide.

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