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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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STUDI KOMPUTASI BERBASIS DFT TERHADAP FENOMENA QUANTUM TUNNELING DALAM ISOMERISASI METILHIDROKSIKARBENA Jumaidil Awal; Rahmat Gunawan; Eva Marliana
JURNAL KIMIA MULAWARMAN Vol 9 No 2 (2012)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Density functional theory-based methods have been applied to predict the most possible one among the isomerizations of methylhydroxycarbene considering the probability of hydrogen tunneling occurrence. B3LYP/6-31+G(d,p) and M08-SO/6-31+G(d,p) methods were applied in all computations using GAMESS-US software. There were three steps of computation in this research. First, electronic structure computations of both equilibrium and transition compounds involved in all isomerization alternatives in order to obtain the optimum structures of the compounds. Second, vibrational computations of optimum transition structures to ensure that each of the respective structures is well on its potential energy surface. Third, tunneling analysis accomplished by intrinsic reaction coordinate (IRC) computatuins for all isomerization alternatives followed by tunneling probabilitycalculation using the Wentzel-Kramers-Brillouin (WKB) formula for methylhydroxycarbene isomerizations. The result of this research showed that the DFT methods successfully produced the optimum structure of each compound. Both DFT methods also successfully mapped all the intrinsic reaction coordinates. B3LYP/6-31+G(d,p) method gave tunneling probabilities of 3.55 x 10-19 for the isomerization into acetaldehyde and 3.30 x 10-20 for that into vinyl alcohol. While M08-SO/6-31+G(d,p) method gave tunneling probabilities of 2.38 x 10-23 for the isomerization into acetaldehyde and 4.79 x 10-23 for that into vinyl alcohol.Keywords: DFT, methylhydroxycarbene, hydrogen tunneling, isomerization
UJI FITOKIMIA, TOKSISITAS DAN AKTIVITAS ANTIBAKTERI TERHADAP EKSTRAK ETANOL DAUN RAMBUSA (Passiflora foetida L.) TERHADAP BAKTERI Staphylococcus aureus DAN Escherichia coli Noviyanti Y; Subur P Pasaribu; Daniel T
JURNAL KIMIA MULAWARMAN Vol 12 No 1 (2014)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Phytochemical tests were conducted, brine shrimp lethality test / BSLT and antibacterial activity test of the coarse extract and fractions from the Rambusa leaves (Passiflora foetida L.) derived from Samarinda, East Kalimantan. Rambusa leaf samples (Passifloa foetida L.) was extracted by ethanol, then concentrated using rotary evaporator. Then fractionated by using n-hexane and ethyl acetate solvent. According the test results, phytochemical compounds of secondary metabolites has contained alkaloids and steroidal compounds, triterpenoids. Within the antibacterial activity test using Staphylococcus aureus (Positive gram) and Escherichia coli (Negative Gram) using the discs method. This test using concentration in 1%, 5%, 10%, 15%, 20% resulted that the most active fraction is the fraction of n-hexane with minimum inhibitory rate was 1% and brine shrimp lethality test within concentration in 1000; 500; 250; 125; 62.5; 31.25; 15.625; 7,8125 ppm showing larval lethality of Artemia salina (L.) using SAS probit analysis to determine the value of Lethal Concentration 50% (LC 50 ). This test resulted that the most active fraction is the fraction of n-hexane with 133.7473 ppm of LC 50 values .Keywords : Passiflora foetida L. , phytochemical test , test antibacterial activity , bacterial and LC 50
Aktivitas Antioksidan dan Antimalaria Senyawa Fenolik dari Daun Macaranga beccariana Merr. Eva Marliana; Chairul Saleh; Medi Hendra
JURNAL KIMIA MULAWARMAN Vol 15 No 2 (2018)
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.v15i2.611

Abstract

Macaranga beccariana Merr. is an endemic plant of Kalimantan which is no report yet about its biological activity and isolated compounds. Therefore, in order to know the potency of M. beccariana, determination of antioxidant and antimalarial activities along with isolation of bioactive compounds from this plant must be carried out. In this research, the leaves of M. beccariana was extracted using methanol to obtain methanol extract. Furthermore, the extract was separated and purified to obtain compound 1 and compound 2. Based on structure elucidation using spectrometer analysis including UV, 1H and 13C NMR, compounds 1 and 2 which belong to phenolics were identified as 4-hidroxybenzoic acid and 3,4-dihidroxybenzoic acid, respectively. Moreover, antioxidant activity using DPPH (2,2-diphenyl-1-picrylhydrazyl) and antimalarial activity towards Plasmodium falciparum strain 3D7 using Giemsa staining were performed. Rutine and chloroquine difosfat were used as positive controls for antioxidant and antimalarial, respectively. The results showed that the methanol extract of M. beccariana and its isolated compounds (1 and 2) are active for those activities. It can be concluded that the leaves of M. beccariana has good potency as antioxidant and antimalarial agents.
Sintesis Sabun Lunak Yang Mengandung Polihidroksi Dari Minyak Biji Kakao (Theobroma cacao,L) Chairul Saleh; Daniel Tarigan; Rabiatul Adhawiyah Al-Idrus
JURNAL KIMIA MULAWARMAN Vol 13 No 2 (2016)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

The research about synthesis of Soft Soap Containing polyhydroxy from Cocoa seed Oil, beginning with the manufacture of the polyhydroxy compound wherein the polyhydroxy compound is obtained through a process of epoxidation and hydroxylation by reacting oils cocoa beans with peroxide acetic acids (peroxy acetate was obtained from the reaction of glacial acetic acid with hydrogen peroxide) with an acid catalyst sulfate followed by oxirane ring opening process (hydrolysis) at a temperature of 40-45 oC for 2 hours, the results obtained with the reaction yield of 60 %. In the form of a mixture of soft soap is obtained by saponification of compounds polyhydroxy with Potassium Hydroxide at a temperature 70-75 oC for 1 hour with a yield of 86,45 %. Polyhydroxy compound and soap from the cocoa bean oil was analyzed by FT-IR spectrophotometer. Respectively iodine from the cocoa bean oil 102,93mg I / gram of oil and polyhydroxy compound is 20,21 mg I / gram of oil. HLB of soap Software of oil and polyhydroxy cocoa beans from the cocoa bean oil is determined by titration method and obtained HLB of soft soap from the cocoa bean oil was 8.74 while the polyhydroxy from cacao seed oil is 10,94.
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..
PEMANFAATAN ARANG AKTIF DARI KULIT DURIAN (Durio zibethinus L.) SEBAGAI ADSORBEN ION LOGAM KADMIUM (II) Marlinawati -; Bohari Yusuf; Alimuddin -
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 of adsorption cadmium (II) metal ions in the solution by activated carbon from durian peel has been done. Adsorption process is done by using a variation of pH (1, 2, 3, 4, 5 and 6), variation of contact time (15, 30, 45, 60, 75 dan 90 menit), variation of the concentration (20, 30, 40, 50 dan 60 mg/L). Analysis of metal ion concentration of cadmium (II) used by Atomic Absorption Spectrophotometer (AAS). The results of this research shows that the optimum condition was achieved at the pH value of 4 and the contact time of 60 minutes. Metal ion adsorption of cadmium (II) by activated carbon from durian’s peel at pH value of 4 and the contact time of 60 minutes can achieve 64,540%. Metal ion adsorption capacity of cadmium (II) adsorbed by activated carbon from durian’s peel can achieve 0,4951 mg/g.Keywords : Adsorption, Activated Carbon, Durian Peel, Metal Ions Cadmium (II)
UJI TOKSISITAS (Brine Shrimp Lethality Test) dan UJI AKTIVITAS ANTIBAKTERI DAUN KEMBANG BULAN (Tithonia diversifolia A. Gray) TERHADAP BAKTERI Staphylococcus aureus dan Escherichia coli Mira Wahyuni; Chairul Saleh; Rudi Kartika
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 tests (Brine Shrimp Lethality Test) and the antibacterial activity of kembang bulan leaf (Tithonia diversifolia A. Gray). Phytochemical test results of secondary metabolites kembang bulan leaf (Tithonia diversifolia A. Gray) show that the ethanol extract contains alkaloids, flavonoids, steroids, phenolic and saponins. N-hexane fraction containing alkaloids and steroids. Ethyl acetate fraction contain flavonoids and steroids. Shrimp larvae toxicity test values obtained Lethal Concentration 50% (LC 50 ) at 383.5660 ppm ethanol extract, fractions 325.1583 ppm n-hexane and ethyl acetate fraction 196.3755 ppm. Test antibacterial activity against Staphylococcus aureus (Gram positive) and Escherichia coli (Gram negative) indicates that the most active fraction was ethanol extract the value of minimum inhibitory 1-2% (w / v) where the clear zone diameter of 8.5 to 9, 75 mm in the bacterium Escherichia coli and from 7.5 to 9.75 mm in Staphylococcus aureus. 
PEMANFAATAN AMPAS KOPI SEBAGAI ARANG AKTIF UNTUK ADSORBEN RHODAMIN B Evifania Juvita Anggriani
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.v18i1.884

Abstract

Research on the use of coffee grounds activated carbon as an adsorbent to reduce the content of Rhodamine B dye has been carried out. The activated carbon used is chemically activated by immersion using 1 M H3PO4 solution for 24 hours then burned at 500ËšC for 45 minutes, while physically activated it is carried out by burning at 500ËšC for 45 minutes. The results of the study which showed the characteristics published in SNI 06-3730-1995, the optimum conditions of Rhodamine B adsorption on both activated carbon at pH 7 and contact time at 15 minutes. Rhodamine B adsorption isotherms on chemically and physically activated carbon using Langmuir adsorption isotherm models with adsorption capacities are 1.6943 mg/g and 1.5936 mg/g, respectively. Chemical and physics activated coffee grounds activated carbon were applied to reduce Rhodamine B from sarung waste in Samarinda. Decrease of Rhodamine B levels in 25 mL of waste samples containing Rhodamine B 14.1860 mg/g with 1 gram of adsorbent were 89.1125% and 60.7923%, respectively. Keywords: Activated carbon, Spent coffee grounds, Rhodamine B, Adsorption
UJI KADAR ASAM LAKTAT PADA KEJU KACANG TANAH (Arachis hypogaea L.) BERDASARKAN VARIASI WAKTU DAN KONSENTRASI BAKTERI Lactobacillus bulgaricus DAN Streptococcus lactis Ulfa Mutia; Chairul Saleh; Daniel -
JURNAL KIMIA MULAWARMAN Vol 10 No 2 (2013)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

The research has done of “Test content of free fatty acids in cheese peanut (Arachis hypogaea L.) by variations storage period difference and the concentration of bacteria Streptococcus lactis and Lactobacillus bulgaricus.” The cheese processing includes: coagulation, formation or salting and storage period. And the addition of skim milk and starter bacteria Streptococcus lactis and Lactobacillus bulgaricus. In the research purpose for determination the effect of concentration of starter bacteria Streptococcus lactis and Lactobacillus bulgaricus and storage period difference to free fatty acid of peanut cheese. This research used 2 factors and conducted by three time repetition. The first factor was the concentration of starter (1%, 2% and 3%) and the second factor storage period (5, 10 and 15 days). The results showed that the highest free fatty acid of starter bacteria at a concentration of 3% and storage period of 10 and 15 days. The lowest free fatty acid of starter bacteria at a concentration of 1% and storage period at zero day.Keywords: Peanut, free fatty acid, fermentation, cheese.
IDENTIFIKASI SENYAWA METABOLIT SEKUNDER EKSTRAK n-HEKSANA DAUN BERWARNA MERAH DARI Syzygium myrtifolium Walp. Tri Novianti; Chairul Saleh; Erwin Erwin
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.v17i1.432

Abstract

Pucuk Merah (Syzygium myrtifolium Walp.) is one of the plants belonging to the genus Syzygium family Myrtaceae. This study has been carried out to isolate and identify secondary metabolite from red leaf of Syzygium myrtifolium Walp. This research was conducted by extracting Syzygium myrtifolium Walp. leaf with Etanol followed by partition using n-Hexane, n-Hexane extact was separated by Coloum Chromatography with system isokratik. The separation of produce a compounds isolated as white powder. The result of GC-MS analysis was suggested 3 major compounds that 1-Octadecene; bis (2-ethylhexyl) hexanedioic; and bis (2-ethylhexyl) phthalate with a molecules weight in a row 252; 370 and 390.

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