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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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PENGARUH VARIASI WAKTU FERMENTASI TERHADAP KADAR LAKTOSA, LEMAK, pH DAN KEASAMAN PADA SUSU SAPI YANG DIFERMENTASI MENJADI YOGURT Yeni Agustina; Rudi Kartika; Aman S Panggabean
JURNAL KIMIA MULAWARMAN Vol 12 No 2 (2015)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Yogurt is a fermentation milk product with bacteria Streptococcus thermophillus and Lactobacillus bulgariccus which has been commonly used in the process of making yogurt. The purpose of this study was to determine the effect of fermentation on the levels of lactose, fat, pH, acidity in yogurt. Determination of lactose in volumetric according Gohr, fat content carried by the Gerber method, using a pH meter pH and acidity values using titration.Keywords : lactose, fat, pH, acidity, fermentation, yogurt.
ANALISIS RHODAMIN B PADA SAUS TOMAT YANG BEREDAR DI SAMARINDA MENGGUNAKAN SPEKTROFOTOMETER UV-VIS Diah Kusumaningsih; Alimuddin Alimuddin; Erwin Akkas
JURNAL KIMIA MULAWARMAN Vol 17 No 2 (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.v17i2.458

Abstract

Abstract Analysis of rhodamine B in tomato sauce which is distributed in Samarinda city have been done. The identification are used chromatography paper and spectrophotometer UV-Vis in wavelength of 553nm. The result of research are showed in 5 of 20 samples that identified are positive of rhodamin B, which is tomato sauce in spring rools are 2.865 mg/L, tomato sauce in sausage are 2.033 mg/L, tomato sauce in meatball snacks are 2.008 mg/L, tomato sauce in cireng snacks are 1.058 mg/L, and the tomato sauce in tofu snacks 1.756 mg/L. Keywords: Rhodamine B, Chromatography Paper, Spectrophotometer UV-Vis
PENGARUH PENAMBAHAN INISIATOR DIKUMIL PEROKSIDA DAN DIVINILBENZENA SEBAGAI CROSLINK PADA KOMPATIBILITAS RASIO CAMPURAN POLIETILENA DAN KARET ALAM SIR 3L Amir Hamzah Siregar
JURNAL KIMIA MULAWARMAN Vol 8 No 1 (2010)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

The research about  the influence of adding initiator dicumyl peroxide and divinylbenzene as crosslink agent on the compatibility blending rasio polyethylene and natural rubber SIR 3L   has been carried out. Blending is done in two steps, the first step was without the addition of divinylbenzene, polyethylene/natural rubber SIR 3L/dicumyl peroxide (w/w) 50 g : 50 g : 1phr, 2phr, and 3phr. The second step was by the addition of divinylbenzene, polyethylene/natural rubber SIR 3L/divinylbenzene/dicumyl peroxide (w/w) 50 g : 50 g : 1phr :1phr, 2phr : 1phr, 3phr : 1phr, 1phr : 2 phr, 2phr : 2phr, 3phr : 2phr, 1phr : 3phr, 2phr : 3phr, dan 3phr : 3phr. To determine the quality of yielded composites,  the tensile test analysis was done, obtained the increasing concentration without divinylbenzene, maximum at variation of concentration polyethylene/natural rubber SIR 3L/dicumyl peroxide is 2 phr is tensile strength and elasticity was 2.20 kgf/mm2 and 12.29%, and by addition of divinylbenzene  obtained the increasing maximum at variation of concentration polyethylene/natural rubber SIR 3L/divinylbenzene/dicumyl peroxide 3phr : 2phr, the tensile strength and elasticity was 3.31 kgf/mm2 and 28.99%. From the SEM analysis result was obtained that the addition of divinylbenzene could improved the composite’s surface so that  become more flatten and homogeneous. From the functional group analysis FT-IR showed that the mixture of divinylbenzene and polyethylene/natural rubber SIR 3L/dicumyl peroxide were just physical interaction. Keyword: peroxside,  Divinyl benzene, Poly Ethylene, Natural rubber (SIR 3 L) Blending
PEMANFAATAN TUMBUHAN SERAI WANGI (Cymbopogon nardus (L.) RENDLE) SEBAGAI ANTIOKSIDAN ALAMI Willem Hendrik G; Erwin -; 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

The phytochemical test, brine shrimp lethality test and antioxidant activity test on secondary metabolits of serai wangi (Cympogon nardus (L.) Rendle) stalk have been completed. Samples are extracted by masseration method that is concentrated by using rotary evaporator. The methanol hard extract are then fractioned with n-hexan and etil n-hexane and ethyl acetate. Based on secondary metabolits phytochemical test of serai wangi (Cympogon nardus (L.) Rendle) stalk showed that methanol raw ekstract contains flavonoid, fenol and triterpenoid. n-hexane fraction extract contain steroid and ethyl Acetat fraction extract contains flavonoid, fenol and terpenoid. 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 fraction is n-hexane fraction with LC50 value of 86,9704 ppm. Based on the antioxidant activity by scavenging activity of DPPH used spectrophotometry was obtained that Inhibition Concentration 50% (IC50) of methanol extract is 67,18 ppm, extract of n-hexane fraction is 1.078,41 ppm, extract of ethyl acetat fraction is 68,96 ppm and vitamin C is 3,05 ppm.Keyword: Cympogon nardus (L.) Rendle, Phytochemical Test, Antioxidant Activity Test, DPPH.
MODIFIKASI KARET ALAM SIKLIS DENGAN KOMONOMER MALEAT ANHIDRAT DAN ASAM OLEAT MELALUI METODE PENCANGKOKKAN DENGAN TEKNIK REFLUKS MENGGUNAKAN INISIATOR BENZOIL PEROKSIDA Ahmad Hafizullah Ritonga; Barito Aritonang; Maniur Arianto Siahaan
JURNAL KIMIA MULAWARMAN Vol 17 No 1 (2019)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Penelitian mengenai modifikasi Karet Alam Siklis (KAS) dengan komonomer maleat anhidrat (MA) dan karet alam siklis (KAS) dengan komonomer asam oleat (AO) melalui metode grafting dengan teknik refluks menggunakan inisiator Benzoil Peroksida (BPO) telah dilakukan, yang bertujuan untuk mengetahui komonomer yang paling baik antara maleat amhidrat (MA) dengan asam oleat (AO) dalam memodifikasi KAS menggunakan inisiator BPO membentuk material baru yaitu KAS-g-MA dan KAS-g-AO, yang hasilnya dilakukan pengujian persentase derajat grafting dan dianalisis menggunakan spektroskopi FTIR. Modifikasi ini dilakukan dengan cara melarutkan sejumlah KAS dengan xylena pada suhu 45-55oC, kemudian dicampurkan larutan KAS tersebut dengan MA atau AO, yang dilanjutkan dengan penambahan inisiator BPO, sambil tetap diaduk selama satu jam, dicuci dengan etanol dan aseton, didiamkan dalam desikator, dan hasil yang diperoleh diketahui bahwa pada nilai dearajat grafting KAS-g-MA sebesar 1,49% sedangkan pada KAS-g-AO sebesar 3,34%. Hasil analisis dengan FTIR, untuk MA dan AO keduanya menunjukkan bahwa ada pemunculan serapan tajam pada bilangan gelombang 1711,23 cm-1 (MA) dan 1709,88 cm-1 (AO) yang mengindikasikan adanya gugus karbonil C=O, hal ini berarti kedua komonomer tersebut benar telah tercangkok pada KAS.
IMPREGNASI DAN KARAKTERISASI K-DEOILED SPENT BLEACHING EARTH (K-DSBE) DENGAN METODE BASAH Arif Dwiki Saputra; Noor Hindryawati; Daniel Daniel
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.v15i2.504

Abstract

In this research, KOH has been impregnated on Deoiled Spent Bleaching Earth (DSBE) with wet method as a catayst. KOH was impregnated on DSBE of 40 % and 60 % (w/w), then characterized using X-Ray Flourescence (XRF), X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), surface area test and alkalinity test. The XRF analysis results showed that potassium oxide composition increased after impregnation. The XRD analysis results show that DSBE belongs to the rectorite type of Na-montmorillonite, whereas the SEM analysis results indicate a morphological change in DSBE. K-DSBE catalysts 40 % and 60 % KOH impregnation have a basicity of 1.46 mmol/g and 1.55 mmol/g with a surface area of ​​23.81 m2/g and 23.56 m2/g.
MENINGKATKAN KUALITAS REPEATABILITY DAN REPRODUCIBILITY SAMPEL LIQUID GAS DE-ETHANIZER DI PT. BADAK DENGAN MEMODIFIKASI ALAT PREPARASI PADA KROMATOGRAFI GAS Ardiansyah -; Chairul Saleh; Rahmat Gunawan
JURNAL KIMIA MULAWARMAN Vol 11 No 2 (2014)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Modification has been done to the gas chromatograph by adding a de-ethanizer preparation tool that serves as the evaporation of liquid samples de-ethanizer gas from the LNG (Liquid Natural Gas) plant PT. Badak NGL Bontang, East Kalimantan. With the aim to obtain stable analysis results as required. From the results obtained for the repeatability value 0.104% methane component, 0.036% ethane component and 0.154% propane components and reproducibility values obtained for the methane component of 0.025%, 0.036% component ethane, and propane components 0.014%. Data analysis of the samples obtained test results are still below thelimit allowed by the method of GPA 2261-64 which found samples with good homogeneity so that the analysis becomes stable and the true value can be resposibility and laboratory as a Quality Control can keep reliability for LNG Plant. Keywords: liquid natural gas, de-ethanizer, gas chromatography, repeatability, reproducibility, GPA2261-64
ISOLASI DAN IDENTIFIKASI SENYAWA TRITERPENOID DARI EKSTRAK n-HEKSAN FRAKSI 8 NODA KE- 2 DARI DAUN MERAH PUCUK MERAH (Syzygium Myrtifolium Walp.) Septi Roro Liniawati; Chairul Saleh; 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.v16i2.874

Abstract

Isolation and identification of triterpenoid componds n-hexsane extract on 8 fraction of second stain from red leaf of Pucuk Merah (Syzygium myrtifolium Walp.) leaves has done. The leaves red Pucuk Merah has potential as bioactive ingredients of traditional medicinal plants in Indonesia. These leaves contain secondary metabolites Triterpenoid which has been tested phytochemical and bioactivity as antibacterial and antioxidant. Isolation was conducted by maceration method with ethanol, ethanol extract was partition with n-Hexane solvent. Then proceed with the separation by column chromatography isocratic. The results of the isolation process which isolates obtained second fractions 8 as white powder to 1.2 mg with Rf value of 0.625. Based on GC-MS analysis showed four major compounds contained in n-hexane fraction red Pucuk Merah leaves namely cis-6-ethyl-4a-cis, trans-8a-perhydro-trans-1-2-methoxycarbonylethyl)-trans-2,tr; phthalic acid, di (2-propylpentyl) ester; benzenesulfonanilide; and 14-β-H-Pregnan with a molecular weight of 339; 390 ; 233 and 288
Penentuan Total Fenolik Dan Aktivitas Antioksidan Ekstrak Etanolik Daun Samama (Anthocephalus Macrophylus) Asal Ternate, Maluku Utara Khadijah Khadijah; Ahmad Muchsin Jayali; Sudir Umar; Iin Sasmita
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.v15i1.495

Abstract

Penelitian ini dilakukan untuk mengetahui kandungan total fenolik dan aktivitas antioksidan pada tanaman Samama atau Jabon Merah (Anthocephallus macrophyllus) asal Ternate Maluku Utara, serta menentukan hubungan antara kandungan total fenolik dengan aktivitas antioksidannya. Ekstrak etanol diperoleh dengan cara maserasi daun Samama yang telah dikeringkan dan dipisahkan berdasarkan umur daun (muda dan tua). Penentuan metabolit sekunder ekstrak dilakukan dengan skriining fitokimia yang menunjukkan adanya senyawa alkaloid, fenolik, steroid, dan saponin. Total fenolik ekstrak ditentukan dengan metode Folin-Ciocalteu diperoleh kadar total fenolik sebesar 119,68 mgGAE/g untuk daun muda dan 210,22 mgGAE/g untuk daun tua. Aktivitas antioksidan dianalisis dengan metode DPPH diperoleh nilai IC50 80.34 µg/mL pada daun muda, dan 43.49 µg/mL pada daun tua samama. Kandungan total fenolik ekstrak daun samama dan nilai IC50-nya menunjukkan hubungan linier y = -2,4647x + 317,22 dengan nilai determinasi R2 = 0.9996
UJI TOKSISITAS DAN AKTIVITAS ANTIBAKTERI BERBAGAI FRAKSI EKSTRAK DAUN TANAMAN KAMBOJA (Plumeria acuminate Ait.) Subur P Pasaribu; Wahidatul Nuriah; Erwin -
JURNAL KIMIA MULAWARMAN Vol 10 No 2 (2013)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Research about phytochemical, brine shrimp lethality and antibacterial activity tests in each fraction from kamboja leaves (Plumeria acuminate Ait.) from Loa Janan, East Kalimantan has been carried out. Plumeria acuminate Ait. leaves was extracted with ethanol and then concentrated by using rotary evaporator. The total extract was fractioned with n-hexane, and ethyl acetate. Based on the secondary metabolites phytochemical test of the Plumeria acuminate Ait. leaves show that total extract is contain alkaloid, steroid, and phenolic. n-hexane fraction is contain steroid. Ethyl acetate fraction is contain steroid. Ethanol-water fraction is contain alkaloid and phenolic. Brine shrimp lethality test exhibit mortality rate of Artemia salina (L) by Probit SAS analysis to determine lethal concentration 50% (LC 50 ) value. The test show that the most active was ethyl acetate fraction with LC 50 value of 44.7968 ppm. Antibacteria activity test of extracts for Staphylococcus aureus bacteria (positive Gram) and Escherichia coli (negative Gram) was carried out by paper disc method. The test showed that the most active were ethyl acetate fraction with minimum inhibitor consentration of 1.563% which clear zone diameter was 5.3 mm on Staphylococcus aureus bacteria and 6.3 mm on Escherichia coli bacteria.

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