Garuda - Garba Rujukan Digital

All

Jurnal Kimia Terapan Indonesia

InaJAC
Website

Published by Lembaga Ilmu Pengetahuan Indonesia

ISSN : 08532788 EISSN : 25277669 DOI : -

Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Materials Science & Nanotechnology

Arjuna Subject : -

Articles 283 Documents

9 10 11 12 13

SINTESIS DAN KARAKTERISASI NANOFIBER KOMPOSIT Zn-PVDF KOPOLIMER Yelfira Sari; Muhamad Nasir; Chandra Risdian; Syukri Syukri
Jurnal Kimia Terapan Indonesia Vol 16, No 1 (2014)
Publisher : Research Center for Chemistry - LIPI

Sintesis nanofiber komposit Zn-PVDF kopolimer dengan metoda elektrospinning telah berhasil dilakukan. Proses pembuatan nanofiber komposit sertaÂ morfologi yang terbentuk dipengaruhi oleh penambahan Zn-asetat dengan perubahan diameter rata-rata serat dari 357,13 nm menjadi 777,24 nm. Analisis FTIR menunjukkan bahwa struktur kristal nanofiber komposit Zn-PVDF kopolimer didominasi oleh strukturÎ²-phase, dengan bilangan gelombang 1190,08 cm-1 dan 487,99 cm-1 untuk struktur Î±-phase dan 1404,18 cm-1; 1280,73 cm-1; 1074,35 cm-1; 881,47 cm-1; dan 840,96 cm-1 untuk struktur Î²-phase.Kata kunci :nanofiber komposit, Zn-PVDF kopolimer komposit, elektrospinning,kristal struktur, morfologi, diameter fiberÂ The fabrication of Zn-PVDF copolymer nanofiber composite has been investigated in this research study by using electrospinning method. Fabrication and morphology of nanofiber composite is influenced by the addition of Zn-acetate. The average diameter of nanofiber composites increase with an addition of Zn-acetate, from 357,13 to 777,24nm. FTIRanalysisshowedthat thecrystalstructure ofPVDFnanofiberis dominatedby Î²-phase , thewave number 1190,08 cm-1 and 487,99 cm-1 for Î±-phase structure and 1404,18cm-1; 1280,73cm-1; 1074,35cm-1; 881,47cm-1and840,96cm-1 for Î²-phase structure respectively.Key words : nanofiber composite, Zn-PVDF copolymer composite, electrospinning, crystal structure,Â morphology, fiber diameter

EFFECT OF STOPPING FERMENTATION OF Leuconostoc mesenteroides ATCC 10830 (8-512F) AT DIFFERENT GROWTH STAGES ON DEXTRAN FORMATION AND MEDIUM VISCOSITY Triantarti Triantarti; J. P. Dufour
Jurnal Kimia Terapan Indonesia Vol 10, No 1-2 (2000)
Publisher : Research Center for Chemistry - LIPI

At the cut end of deteriorated sugar cane stalks, Leuconostocmesenteroides grows, secreting dextransucrase and formingdextran. When biocide is sprayed, bacteria will be killed butdextransucrase might still be active and forming dextran.In this experiment, it was found that when fermentation wasstopped (L. mesenteroi des were killed) this enzyme(dextransucrase) was still able to form high concentration ofdextran. The amount of dextran formed depended on the time offermentation. It also depended on the p H and temperature duringthe incubation which affect the activity and the stability ofdextransucrase. The higher the incubation temperature (20-30°C),the more sensitive dextransucrase activity to the pH changes (PH4.6 - 5.4). The highest dextransucrase stability during a 20 hincubation was found at pH 5,4. The highest activity was foundat 30°C for pH 5.4 while at 25°C the activity was only slightly10IVer than 30°C.Key words: dextran formation, medium viscosity,dextransucrase.

Effect of Combining Electron Beam Irradiation and Alkaline Pretreatments of OPEFB for Enzymatic Hydrolysis and Fermentation of Ethanol Deliana Dahnum; Vera Barlianti; Kiky C. Sembiring; Anis Kristiani; Muryanto Muryanto; Yanni Sudiyani
Jurnal Kimia Terapan Indonesia Vol 19, No 1 (2017)
Publisher : Research Center for Chemistry - LIPI

The effect of pretreatment process from the combination of electron beam irradiation and alkaline to Oil Palm Empty Fruit Bunch (OPEFB) was studied. The combination of pretreatment method was considered as an alternative way to increase glucose yield. In this study, OPEFB was pretreated using Electron Beam Irradiation (EBI) at 100 kGy and 300 kGy and followed by chemical pretreatment. In chemical pretreatment, irradiated OPEFB was reacted with sodium hydroxide 6% and 10% in stirred vessel at 4 bars and 150 oC for 30 min. The effectiveness of pretreatment was evaluated by calculating the composition of chemical component using National Renewable Energy Laboratory (NREL) Method. The samples which were hydrolyzed using enzymes with the addition of 30 FPU of Cellic®CTec2 per gram of pretreated biomass resulted high glucose in the amount of 9.86%. The fermentation process using Saccharomyces cereviceae obtained the highest ethanol concentration for 5.36% at 72h. The combination of the two pretreatment methods gave an effect on the weight loss, chemical composition, structure, and enzymatic hydrolysis product

PENGARUH TEKANAN REAKTOR PADA PENGHIDRORENGKAHAN TAR BATUBARA Novie Ardhyarini; Daliya Indra Setiawan; Syntha Nardey
Jurnal Kimia Terapan Indonesia Vol 15, No 2 (2013)
Publisher : Research Center for Chemistry - LIPI

Coal gasificationproduce tar as aside-product. Coal tar is a complexmixture, and consists of various functionalgroups mainly polyaromatic compounds.Due to its chemical composition, coal taris categorized as hazardous material. Thephysical and chemical properties of coaltar is similar to crude oil, but it has higherpolyaromatics and impurities. Thoseproblems are the main challenges ofprocessing coal tar into fuel. Therefore, anupgrading process is required This paperdiscussed upgrading coal tar into fuel byhydrocracking in an autoclave reactorusing catalyst of nickel-molybdenum withalumina-silica support. Effect of reactorpressure was observed Hydrocrackingproduct at 450Â°C and 120bar showed thebest result where the HIC molar ratioincreased 26% and the specijic gravitydecreased 19%. The impurities of sulphurand nitrogen decreased 88,5% and 72%respectively. Hydrocracking productwasdistilled using a simulated distillation bygas chromatography. Based on simulateddistillation analysis, the product could befractionated into 2,2%vol of light end,33.8%vol of naphtha, and 48%vol ofmiddle distillate. These results showed thatcoal tar is potential to be processed intofuel. Furthermore, the utilization of coaltar can be a solution of waste treatment aswell.Keywords :Coal tar, waste, hydro cracking,autoclave reactor, fuel

CARBON MONOXIDE CHEMISORPTION- CHARACTERIZATION AND TESTING OF PREPARED NICKEL CATALYSTS FOR AMINATION OF ETHANOL Achmad Hanafi Setiawan
Jurnal Kimia Terapan Indonesia Vol 4, No 2 (1994)
Publisher : Research Center for Chemistry - LIPI

Three types of nickel metal catalyst supported on silica gel have been prepared using impregnation, ion exchanged sodium hydroxide and ion exchanged ammonia methods, in order to investigate the influence of preparation methods on metal dispersion and their activities for amination of ethanol. All the catalyst samples had a nominal nickel loading of 5 % (w/w). After preparation, the catalysts were activated by a drying stage followed by calcination and reduction. The result of transferring the nickel salt to the support phase has shown that the impregnation method was the most efficient, and the least efficient being the ion exchanged sodium hydroxide method. The results from the carbon monoxide chemisorption studies showed that the nickel is poorly dispersed(2%) in the impregnated sample, and highly dispersed(20%) in the ion exchanged sample prepared by the ammonia method. The dispersion was lower(6%) for the catalyst prepared by the sodium hydroxide method due to the formation of sodium nickel silicates which were difficult to reduce. The amination of ethanol over these catalysts was found to take place at 503 OK with methane being formed as a byproduct. The ion exchanged sample prepared by the ammonia method gave the highest yield(57%) of ethylamine although its specific activity/m2 nickel metal(4 x 10-7) was similar to the sample prepared by the impregnation method. The retained sodium in the ion exchanged sodium hydroxide catalyst poisoned metal sites for ethanol amination.

SINTESIS, UJI AKTIVITAS SITOTOKSIK IN VITRO DAN MOLECULAR DOCKING SENYAWA 1-(4-KLOROBENZOIL)-1,3-DIMETILUREA Dian Agung Pangaribowo; Siswandono Siswandono; Bambang Tri Purwanto
Jurnal Kimia Terapan Indonesia Vol 16, No 1 (2014)
Publisher : Research Center for Chemistry - LIPI

Senyawa 1-(4-klorobenzoil)-1,3-dimetilurea telah dirancang, disintesis, diidentifikasi struktur, dan diuji aktivitas sitotoksik secara in vitro. Simulasi docking dilakukan dengan memposisikan senyawa ke dalam sisi aktif reseptor Checkpoint kinase 1 (Chk1) untuk menentukan model pengikatan ligan reseptor. Sintesis 1-(4-klorobenzoil)-1,3-dimetilurea dilakukan lewat reaksi asilasi antara 1,3-dimetilurea dan 4-klorobenzoil klorida. Kemurnian produk hasil sintesis ditentukan dengan metode Kromatografi Lapis Tipis (KLT).Identifikasi struktur dilakukan dengan spektrofotometer UV, FT-IR dan spektrometer NMR. Hasil uji antiproliferatif menunjukkan bahwa senyawa 1-(4-klorobenzoil)-1,3-dimetilurea memiliki aktivitas sitotoksik terhadap sel HeLa yang lebih baik dibandingkan dengan kontrol positif yaitu hidroksiurea. Senyawa 1-(4-klorobenzoil)-1,3-dimetilurea dengan potensi aktivitas sitotoksik ini dapat menjadi agen antikanker yang potensial.Â Kata kunci: 1-(4-klorobenzoil)-1,3-dimetilurea, molecular docking, sintesis, aktivitas sitotoksik, hidroksiureaÂ A novel 1-(4-chlorobenzoyl)-1,3-dimethylurea has been designed, synthesized, structurally determined, and the in vitro cytotoxic activity was evaluated. Docking simulation was performed to position this compound into the Checkpoint kinase 1 (Chk1) active site to determine the probable binding model. Synthesis of 1-(4-chlorobenzoyl)-1,3-dimethylurea was completed by acylation reaction between 1,3-dimethylurea and 4-chlorobenzoyl chloride. The purity of synthesized product was determined by Thin Layer Chromatography. Structure identification was performed by UV spectrophotometer, FT-IR and NMR spectrometer. Antiproliferative assay result demonstrated that this compound possessed good cytotoxic activity against HeLa cells, which is comparable to the positive control, hydroxyurea. This compound with potent cytotoxic activity might be a potential anticancer agent.Â Keywords: 1-(4-chlorobenzoyl)-1,3-dimethylurea, molecular docking, synthesis, cytotoxic activity

Kinerja Katalis Nikel/Titanium Oksida Yang Dibuat Dengan Metoda Impregnasi Terhadap Hidrogenesi Minyak Sawit Dewi Sondari; S.R Wahuningsih
Jurnal Kimia Terapan Indonesia Vol 9, No 1-2 (1999)
Publisher : Research Center for Chemistry - LIPI

The preparation of nikel aktif metal catalyst and oksida titanium as supporting materials by impregnation method.The content of metal is various between 20-30% (weight). Specifik surface area of catalyst is measured BET method, the content 22.5% of catalyst have maximal specific surface area is 14,5288m2/gr.From XRD analysis, aktif metal catalyst before reduction is metal oksida NiO (200) at 20 = 43,47, after reduction showednickle metal cristal at 20 = 44,50 is peak caracteristic from Ni (111).Test activity comerical catalyst after reaction time two hoursiodine number decreased 34,00 preparated catalyst 44,50 atcontent 22,5%.

The Influence of Poly(Lactic Acid) Addition to Thermal Properties of the Blended Polypropylene for Food Packaging Materials Achmad Hanafi Setiawan; Sanjaya Sanjaya; Fauzan Aulia
Jurnal Kimia Terapan Indonesia Vol 19, No 1 (2017)
Publisher : Research Center for Chemistry - LIPI

The commonly used food packaging materials are made from synthetic polymers derived from petroleum. However, the use of synthetic polymers has negative impacts on the environment, because it is difficult to degrade naturally either by the biotic or abiotic process. Although their complete replacement with eco-friendly packaging films is just impossible to achieve economically, at least for a specific application like food packaging the use of bioplastics should be the future. One of the alternatives is to blend synthetic polymer for instance polypropylene (PP) with a natural polymer like poly-lactic acid (PLA). Because their mixture is an immiscible blend because they have highly different polarity, it is necessary to add a compatibilizer such as polypropylene-grafted maleic anhydride (PP-g-MAH) in order to increase the properties of its blend miscibility. The objective of this research was to study the influence of PLA addition to the thermal properties of their blend product with PP. The combinations of PP with PLA in the ratios of (80:20); (90:10); (95:5) were prepared and then characterized for their thermal property behaviour by means of TG and DSC. The results showed that increasing the amount of PLA will decrease their enthalpy significantly

MOLECULAR DOCKING TURUNAN KALKON TERHADAP RESEPTOR ESTROGEN B (ER- B) SEBAGAI ANTIKANKER PAYUDARA Dwi Koko Pratoko
Jurnal Kimia Terapan Indonesia Vol 14, No 1 (2012)
Publisher : Research Center for Chemistry - LIPI

Estrogen receptor-S (ER- ft) was also shown to be the important factor to inhibits proliferation and invasion of breast cancer cells. Estrogen receptor-S complexed with genistein is taken as a role model to target the drug action. Docking molecule chalcone derivatives on Estrogen receptor-S have been done to test the docking energy that associated with binding affinity between ligand and receptor. Based on docking result, Kalkon XII has shown best docking energy (MoIDockScore). Thus Kalkon XII can be synthesized and usedfor in vitro cytotoxic activity.

ISOLASI GENISTEIN DARI TEMPE SECARA KROMATOGRAFI Wuryani Wuryani
Jurnal Kimia Terapan Indonesia Vol 4, No 1 (1994)
Publisher : Research Center for Chemistry - LIPI

The presence of genisteln in tempe (fermented soybean) could be detected by using various chromatographic techniques, such as Thin-Layer, Column and High Pressure Liquid Chromatography. In this experiment, TLC was chosen for the isolation and purification of genistein from tempe. Spectrophotometry, Mass Spectrometry, spraying with chromogenic reagents and hydro- lysis were carried out for identifying genistein. Quantification was carried out spectrophotometrlcally and it was shown that the laboratory prepared tempe (l00 g) contained 13.80 mg ofgenisteln.

Page 11 of 29 | Total Record : 283

9 10 11 12 13

Filter by Year

1991 2022

Filter By Issues

All Issue Vol 24, No 1 (2022): Jurnal Kimia Terapan Indonesia Vol 23, No 2 (2021): Jurnal Kimia Terapan Indonesia Vol 23, No 1 (2021) Vol 22, No 1 (2020) Vol 21, No 2 (2020) Vol 21, No 1 (2019) Vol 20, No 2 (2018) Vol 20, No 1 (2018) Vol 19, No 2 (2017) Vol 19, No 1 (2017) Vol 18, No 02 (2016) Vol 18, No 01 (2016) Vol 17, No 2 (2015) Vol 17, No 1 (2015) Vol 16, No 2 (2014) Vol 16, No 1 (2014) Vol 15, No 2 (2013) Vol 15, No 1 (2013) Vol 14, No 2 (2012) Vol 14, No 1 (2012) Vol 13, No 2 (2011) Vol 13, No 1 (2011) Vol 12, No 2 (2010) Vol 12, No 1 (2010) Vol 11, No 2 (2009) Vol 11, No 1 (2009) Vol 10, No 1-2 (2000) Vol 9, No 1-2 (1999) Vol 8, No 1-2 (1998) Vol 7, No 1-2 (1997) Vol 6, No 1-2 (1996) Vol 5, No 1 (1995) Vol 4, No 2 (1994) Vol 4, No 1 (1994) Vol 3, No 2 (1993) Vol 3, No 1 (1993) Vol 2, No 1-2 (1992) Vol 1, No 2 (1991) Vol 1, No 1 (1991) More Issue

Home Page

OAI Link

Editorial Team

Contact

Reviewer

Google Scholar

Contact Name
-

Contact Email
-

Phone
-

Journal Mail Official
-

Editorial Address
-

Location
Kota adm. jakarta selatan,

Dki jakarta

INDONESIA

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Home Page

OAI Link

Editorial Team

Contact

Reviewer

Google Scholar

Contact Name -

Contact Email -

Phone -

Journal Mail Official -

Editorial Address -

Location Kota adm. jakarta selatan, Dki jakarta INDONESIA

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Contact Name
-

Contact Email
-

Phone
-

Journal Mail Official
-

Editorial Address
-

Location
Kota adm. jakarta selatan,

Dki jakarta

INDONESIA