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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 202 Documents
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ANALISIS FITOKIMIA DAN TOKSISITAS (BRINE SHRIMP LETHALITY TEST) EKSTRAK SERBUK SARI DARI Trigona incisa Novalien Fiergiyanti; Erwin -; Syafrizal -
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 phytochemical, brine shrimp lethality and activity antioxidant test and secondary metabolits of bee pollen have been conducted. The pollen samples are extract with solvent ethanol by masseration method and that is concentrated by using rotary evaporator. The ethanol crude extract obtained are fractioned with solvent ethanol and solvent ethyl acetat. Based on secondary metabolits phytochemical test of bee pollen showed that ethanol crude extract contains alkaloid and fenolik. Ethanol fraction extract contains alkaloid. Ethyl acetat fraction extract contains alkaloid and fenolik. In brine shrimp lethality test, the increase larvae (Artemia salina L.) death and data was yielded recorded then processed using SAS Probit Analysis to determine the lethal concentration 50% (LC50) value. The results of this test obtained data and showed that the most active fraction is ethanol fraction extract with value of LC50 was equel to 249,60 ppm.Keywords: Bee pollen, phytochemical test, brine shrimp lethality test (BSLT).
PEMANFAATAN LIMBAH TONGKOL JAGUNG (Zea mays L.) SEBAGAI ARANG AKTIF DALAM MENURUNKAN KADAR AMONIA, NITRIT DAN NITRAT PADA LIMBAH CAIR INDUSTRI TAHU MENGGUNAKAN TEKNIK CELUP Azwar Amin; Saibun Sitorus; Bohari Yusuf
JURNAL KIMIA MULAWARMAN Vol 13 No 2 (2016)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

A research about utilization of waste corncob (Zea may L.) as active charcoal in reduction ammonia, nitrite and nitrate levels on industrial tofu liquid waste using dye technique have been researched. The purpose of this research to know reduction levels of industrial tofu liquid waste from some parameter is ammonia, nitrite and nitrate by using 2 variations is contact time and pH tofu liquid waste. The percentage yield of research to show of reduction ammonia, nitrite and nitrate levels at the optimum contact time 10 minute and the optimum pH 6 that is 51,29%, 31,93% and 58,71%. And then analyzed of data by using ANOVA test to know Fcount influence of the contact time of active charcoal to reduction ammonia, nitrite and nitrate levels on industrial tofu liquid waste that is 2,4891 less than Ftable 3,00. It is stated that is no significant effet on the reduction ammonia, nitrite and nitrate levels of industrial tofu liquid waste by using variation contact time active charcoal. While Fcount influence of optimum pH industrial tofu liquid waste to reduction ammonia, nitrite and nitrate levels on industrial tofu liquid waste that is 5,7168 more than Ftable 2,07. It is stated that is a significant effet on the reduction ammonia, nitrite and nitrate levels of industrial tofu liquid waste by using variation optimum pH industrial tofu liquid waste.
SINTESIS ASKORBIL LAURAT DARI METIL LAURAT DAN ASAM ASKORBAT MELALUI REAKSI TRANSESTERIFIKASI DENGAN KATALIS LIPASE SERTA UJI AKTIVITAS ANTIOKSIDAN Dyah Adyana; Daniel Tarigan; Chairul Saleh
JURNAL KIMIA MULAWARMAN Vol 14 No 2 (2017)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Antioxidant are defined as compound that is capable of delay, postpone or prevent oxidation reaction, such as on foods and drugs. Antioxidant can be found in nature but the used is relatively limited because hydrophilic. This research aims to modified natural antioxidant so as be used in lipophilic media. Methyl laurate is one of a fatty acid ester potentialy can be used in industry. Modified were made by synthesize of methyl laurate and ascorbic acid through transesterification with catalyst is lipase from sesame seeds (Sesamun indicum L.) in a organic solvent such as acetone. Transesterification process does on reacton time at 36 hours at temperature (40-50) ºC and pH is 7 so has yield produced is 53,89 %. The result is ascorbyl laurate identified of the functional groups using by FT-IR spectrophotometer. Based on the result identification of the functional groups by FT-IR spectrophotometer, then do the analysis of antioxidant activity with a Radical Reduction Method DPPH (2,2-diphenyl-1-picrylhidrazyl). Antioxidant activity value IC50 is 40,57 ppm. This result indicated the potential of ascorbyl laurate as antioxidant.
PENGGUNAAN MONOMER NAFION SEBAGAI PEMBAWA PROTON (H + ) DENGAN METODE TEORI FUNGSI KERAPATAN Alhabib, Albar; Gunawan, Rahmat; Sitorus, Saibun
JURNAL KIMIA MULAWARMAN Vol 12 No 1 (2014)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Research which has been conducted in this study aims to determine the use of the compound as a Nafion membrane in a Proton Exchange Membrane system (PEM) Fuel Cells which acts as a proton exchange (H + ). After assessment and computational chemistry calculations by calculating the value of energy optimization and molecular orbital energies obtained in the form of the HOMO and LUMO energy. Value calculation is done by using the calculation method of Density Function Theory (density function theory). The analysis showed Nafion energy value of -0.04358 x 10-18 J and Nafion after bringing energy protons (H+) of -0.07629 x 10-18 J. In this case proved that the PEM system of exchanging protons (H + ) is characterized by the presence of increased energy electron activity.Keywords : Proton Exchange Membrane, Fuel Cells, Nafion, Proton (H + ), the activity of electrons, density functional theory, the energy of the HOMO, LUMO energy.
ADSORPSI FENOL OLEH ARANG AKTIF DARI AMPAS KOPI Nisa Hayatun Nufus Sunandar; Teguh Wirawan; Rahmat Gunawan
JURNAL KIMIA MULAWARMAN Vol 9 No 2 (2012)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

The comparison of phenol adsorption with activated carbon from coffee residue has been conducted. The first step in this study is coffee residue activation with ZnCl2 in 85oC during 7 hours. The coffee residue was dryed in 24 hours at 110oC and after that it was dissolved by activated carbon with 10% HCl and pH neutralized by using aquades 65oC. The activated carbon was determinate at pH 2-6, with time 15-60 minutes and phenol concentration 2-10 mg/L. From that result would be processed with isotherm Freundlich’s equation. The optimum conditions result obtained at pH 4, time 30 minutes and adsorption capacity of 1.733 mg/g. The activated carbon has been used into waste samples which have addition of phenol and obtained result 2.4751 mg/L from 6.4778 mg/L for waste water A. W. Sjahranie hospital and 0.0560 mg/L from 2.0068 mg/L for Karang Mumus River.Keywords: Phenol, adsorption, activated carbon, coffee residue
MODIFIKASI KOPOLIMER KARET ALAM SIKLIS GRAFTING ASAM OLEAT MENGGUNAKAN INISIATOR BENZOIL PEROKSIDA DAN BAHAN PENGISI BENTONIT-CETIL TRIMETIL AMONIUM BROMIDA Ahmad Hafizullah Ritonga; Barita Aritonang; Liver Iman Putra Zai
JURNAL KIMIA MULAWARMAN Vol 16 No 1 (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.v16i1.726

Abstract

Research on the modification of Cyclic Natural Rubber (CNR) grafting Oleic Acid (OA) copolymer using initiator of Benzoyl Peroxide (BPO) and the filler of bentonite-Cetil Trimethyl Ammonium Bromide (CTAB) has been carried out, which aims to determine the method of modifying Cyclic Natural Rubber (CNR) and Oleic Acid (OA) so it can produce CNR-g-OA copolymer through grafting method with BPO initiator mixed together with bentonite-CTAB. This research was conducted in three stages. The first stage is the process of dissolving CNR using xylene. The second stage is the process of mixing CNR solution and OA with the composition (70:30) phr, followed by the addition of BPO initiator and bentonite-CTAB filler. The third stage is characterization using FTIR and Scanning Electron Microscopy (SEM). The results of the analysis using FT-IR showed an absorption at 1708,23 cm-1 which indicated the presence of C=O bonds from oleic acid which had been grafted on CNR, and increased intensity after addition of bentonite-CTAB at 1568,96 cm-1; 1446,13 cm-1; 1255,66 cm-1; and 866,94 cm-1. Characterization results using SEM showed that the mixing of Bentonite-CTAB in KAS-g-OA was evenly distributed and quite homogeneous.
Sintesis Dialdehid Alginat Melalui Reaksi Oksidasi Natrium Alginat Dengan Natrium Metaperiodat Subur P Pasaribu; Jamaran Kaban; Mimpin Ginting; Kasmirul Ramlan Sinaga
JURNAL KIMIA MULAWARMAN Vol 14 No 2 (2017)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Synthesis of dialdehyde alginate has been done by oxidation reactions of sodium alginate with sodium metaperiodate (ratio of mol 1: 1). The formation of dialdehyde alginate as a result of oxidation are characterized by FT-IR spectroscopy with a peak absorption at 1627.92 cm-1, which is the vibration stretching C = O of functional groups from the aldehyde group resulting from the -OH group oxidation process, the absorption peak is changing its wavelength and intensity more sharply compared to initial sodium alginates. In addition, the C-O-C band (cyclic ether ) at 1033 cm-1 are reduced as a result of chains cleavage. The absorption peaks that appear at 794.67 cm-1 and 732.95 cm-1 are included in the bond CH which contributes to cleavage the bending C-C of oxidized sodium alginate.
PEMBUATAN LEMAK KAKAO RENDAH KALORI DENGAN MINYAK KELAPA (COCONUT OIL)) MELALUI REAKSI INTERESTERIFIKASI Lelya Hilda
JURNAL KIMIA MULAWARMAN Vol 8 No 1 (2010)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Cacao fat has long chain fatty acids was high mainly palmitic and stearic can be improved their character by adding of palm oil to obtain cocoa fat was low calories. The addition of coconut oil can be done only up to 20%, which is the ratio (90:10) and (80:20) cocoa fat and coconut oil with solid fat content of 5:53 and 4:58 with a melting point 33.6 ° C and 32.8oC (32oC-35oC melting point cacao fat). The process was be done by interesterification reaction produces cocoa fat that free of trans fatty acids .Keywords: long chain fatty acaid, low calory, solid fat content, melting point
Potensi Antijamur Ekstrak Metanol Daun Mangrove Rhizopora Mucronata Terhadap Jamur Candida Albicans Dan Aspergillus Niger Usman Usman; Vega Julia Putri Adi
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.v15i1.583

Abstract

Candida Albicans and Aspergillus Niger are some of the infectious fungi. Empirically bark, flower, root and mangrove leaves Rhizophora mucronata can be a hepatitis drug. This study aims to determine the antifungal potential of methanol extract of Rhizophora mucronata leaves to Candida Albicans and Aspergillus Niger fungus. Chemical test results that have been done previously are alkaloids, Flavanoid , triterpenoids, saponins, tannins and hydroquinone phenols. The antifungal test was performed by agar diffusion method on Potatos Dextrose Agar (PDA) medium and paper disc.Paper disc soaked in methanolic extract of Rhizophora mucronatapada leaf concentration 1000 ppm, 800 ppm, 600 ppm, 400 ppm and 200 ppm. The positive control solution used ketokenazole drug and negative control using aquades with incubation period of 3 x 24 hours. The results did not prove that Rhizophora mucronata leaf methanol extract was effective to inhibit antifungal activity against Candida Albicans and Aspergillus Niger fungi.
PEMBUATAN SENYAWA METIL ESTER YANG DITURUNKAN DARI DARI MINYAK BIJI BINTARO (Cerbera manghas L.) SEBAGAI BAHAN BAKU DASAR PEMBUATAN SURFAKTAN Ilham Burhanuddin; Daniel Daniel; Erwin Erwin
JURNAL KIMIA MULAWARMAN Vol 16 No 2 (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.v16i2.693

Abstract

Synthesis methyl ester can be formed from kernel bintaro oil (Carberra Mangas L.) with two stages which is esterification and trans-esterification. The test result of methyl ester of bintaro kernel oil have iod value 92,82 g iod/100 gr oil, acid value 1,67 mg KOH/g oil with acid concentration 12,470% and saponification value 185.225 mg KOH/gr oil. From GC-MS analysis fatty acid dominant composition from methyl ester is methyl oleat with walue 45.86%. From HLB analysis show value 0,539. Result of analysis of FT-IR show methyl ester from bintaro kernel oil have typical absorbtion peak on wave number 17443.65 (C=O Ester).

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