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Jurnal Kimia Terapan Indonesia

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Published by Lembaga Ilmu Pengetahuan Indonesia

ISSN : 08532788 EISSN : 25277669 DOI : -

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

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Articles 283 Documents

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STUDIES ON KINETICS OF DIMETHYL CARBONATE SYNTHESIS BY HOMOGENEOUS TRANSESTERIFICATION Haznan Abimanyu
Jurnal Kimia Terapan Indonesia Vol 11, No 2 (2009)
Publisher : Research Center for Chemistry - LIPI

A comprehensive kinetic study on dimethyl carbonate synthesis by transesterification of ethylene carbonate with methanol has been conducted. An alkali base metal (KOH) was used as catalyst in the synthesis of DMC and its catalytic ability was investigated in term of kinetics. The reaction orders, the activation energy and the rate constants were determined for both forward and backward reactions. The reaction is reversible and the equilibrium rate constant wasestimated to be 135.77exp(-16542.4/RT).Keywords : dimethyl carbonate synthesis, transesterification reaction, kinetic study on DMC synthesis

KARAKTERISASI POLIMER BAHAN ADESIF UNTUK KULIT DAN PLASTIK Roestamsjah Roestamsjah; Nuri Astrini
Jurnal Kimia Terapan Indonesia Vol 3, No 2 (1993)
Publisher : Research Center for Chemistry - LIPI

Characterization of polymer of five commercially available elastomeric adhesives claimed 'suitable for leather and plastics had been conducted. Polymer samples were isolated from adhesive solutions by precipitation, and then characterized through FTIR spectroscopy, viscometry, GPC and thermal analysis. The FTIR spectrogram, indicate that five different samples of adhesives contained polychloroprene. Thermal analysis indicated similar glass transition points (Tg) of -40 to -43°C and three of them indicated the second glass transitions at 1.4; 3.6 and 13.5°C, Five adhesives indicated melting points (Tm) of polymers at 43 - 48°C, The average viscosity molecular weight (Mv) indicated two groups; i.e. Mv: 115,000 - 146,000 and Mv : 357,000 - 425,000. From secondary sources, polychloroprene has solubility parameter 8= 8.2 - 9.4 (cal em -3)0.5 or 16.74 - 19.13 (kJ m-3)0.5 and critical surface tension Yc = 38 dyne cmr-1 or mN m-1.

EVALUASI PENGGUNAAN CHEMICAL MODIFIER PADA ANALISIS LOGAM DAN SEMI LOGAM DENGAN GRAPHITE FURNACE ATOMIC ABSORPTION SPECTROMETRY Rosi Ketrin
Jurnal Kimia Terapan Indonesia Vol 17, No 2 (2015)
Publisher : Research Center for Chemistry - LIPI

Graphite Furnace Atomic Absorption Spectrometry (GF-AAS) is not a new method in chemical analysis, especially for metals and metalloids, unfortunately there are a lot of laboratories in Indonesia that still not used it correctly, whereas if used it correctly, the method will be an excellent and can be a reference method. This review focus on the kinds of interferences in the GF-AAS such as spectral, physic and chemical interferences and alsoon the use of a lot of kinds of chemical modifier that very important part in analysis by GF-AAS, however it is often unused because of the difficulty. It is noted that highest absorption level from each analyte is different even though used the same modifier and ashing temperature, therefore the selection of chemical modifier is important to find the appropriate modifier for each analyte and their matrixes.Keyword: GF-AAS, spectral interferences, physic interferences, chemical interferences, chemical modifier

UJI AKTIVITAS EKSTRAK DAN FRAKSINASI DAUN BRUCEA JAVANICA (Merril) SECARA INVITRO Megawati Megawati; M Angelina
Jurnal Kimia Terapan Indonesia Vol 12, No 2 (2010)
Publisher : Research Center for Chemistry - LIPI

Brucea javanica (Merril) is a tropical plant widely grown in Indonesia, Brucea javanica has a bitter taste efficacious to reduce the heat and remove toxins, lethal parasites, anti-anti-dysentery and malaria. Chemical compounds contained in many of which have bioactivity. Antidiabetic test has been performed with a-glucosidase method, anti-oxidant test method "DPPH free radical scavenger" and BSLT toxicity test method (Brine Shrimp Lethality Test) of ethanol extractB.javanica. In the ethanol extract of leaves of the partition B.javanica performed using hexane, ethyl acetate and butanol. Then test each fraction in vitro activity. Test results showed that activity of ethylacetate is active as an anti-oxidant with IC50 value of 89,75 ppm and 7,52 ppm LC50 toxic values while antidiabetic did not have activites.Keyword : Antidiabetic, anti-oxidant, toxicity, a-glukosidase, DPPH, Brine Shrimp Lethality Test, Brucea Javanica(Merril).

STUDI POTENSI EKSTRAK BRUCEA JAVANICA SEBAGAI BIOAKTIF ANTIKANKER PAYUDARA TERHADAP SEL T47D Rina Andriyani; Zalinar Udin
Jurnal Kimia Terapan Indonesia Vol 12, No 1 (2010)
Publisher : Research Center for Chemistry - LIPI

research. Buah makasar (Brucea javanica) known has anticancer activity.This research would bioassay the anticancer activity ofBrucea javanica extract toward T47D breast cancercell by in-vitro method, using SRB dyed. In order to study the mechanism, a dot blotting method was carried out to observe the interaction between the Brucea javanica extract with the chromosomal DNA molecule of T47D Cell Line. The interaction results were analyzed with High Performance Liquid Chromatography (HPLC) methods.The result of anticancer activity assay toward T47D cell showed that Brucea javanica extract has activity with IC50 2.69 g/mL, whereas, the interactionresult was analyzed with High Performance Liquid Chromatography (HPLC) methods, exhibited the reduction peaks with the retention time 2.26; 3.63 and 3.94 minutes. It was concluded that the bioactive activity ofBrucea javanica due to the presenceof these candidates.Keyword: Anticancer bioactivity, DNA ofT47D ceIl,

EFFECTS OF MEDIUM COMPOSITION ON OXYTETRACYCLINE PRODUCTION BY STREPTOMYCES RIMOSUS ATCC 33022 Linar Z. Udin; S. Pudjiraharti; A. T. Karossi
Jurnal Kimia Terapan Indonesia Vol 2, No 1-2 (1992)
Publisher : Research Center for Chemistry - LIPI

The economical production of antibiotics to some extent depends on the availabilily of cheap substrates. The work reported in the present paper deals with the fermentative production of oxytetracycline by Streptomyces rimosus ATCC 33022 using commerciol high fructose syrup (HFS), vitamin B complex and citric acid of technical grode. The effects of concentration of high fructose syrup (0.5 - 2.5 %, v/v), commercial vitamin B complex (0.03 - 0.07 %, w/v) and the citric acid (0.34 - 1.28 %. w/v) were examined in this study. It was found that fermentation medium (medium-MHFS) containing high fructose syrup 1.0 % produced maximum activily of oxytetracycline after 4 days incubation period. Fermentation tnedium (mediwn-MBpleJ containing 0.05 % commerciol vitamin B complex showed maximum acrivily after 3 days incubation. While the addition of citric acid (0.64 %) to the fermentation medium (medium-MCA) was found optimumfor production oxytetracycline.

Optimasi Proses Perlakuan Awal NaOH Tandan Kosong Kelapa Sawit untuk menjadi Bioetanol Muryanto Muryanto; Yanni Sudiyani; Haznan Abimanyu
Jurnal Kimia Terapan Indonesia Vol 18, No 01 (2016)
Publisher : Research Center for Chemistry - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jkti.v18i01.37

Bioetanol dari bahan baku limbah lignoselulosa menjadi energi alternatifyang mulai dikembangkan. Perlakuan awal merupakan tahap awal dariproses konversi lignoselulosa menjadi bioetanol. Perlakuan awal kimiaNaOH dilakukan dengan memasukkan TKKS berukuran 3 mm dan larutanNaOH 10 % pada reaktor bersuhu sedang dan tekanan 4 bar. Pada penelitianakan diketahui pengaruh suhu dan waktu proses pada perlakuan awal TKKS.Variasi suhu proses dimulai dari suhu 140, 150 dan 160 ËšC, sedangkan variasiwaktu proses dimulai dari 20, 30 dan 40 menit. Hasil perolehan biomassatertinggi didapatkan pada proses perlakuan awal dengan suhu 140 ËšC, 20menit sebesar 42,83 % (basis berat kering), delignifikasi tertinggi pada suhu160 ËšC, 40 menit yaitu sebesar 86,92 %. Namun kondisi optimal perlakuanawal TKKS untuk menghasilkan bioetanol tertinggi diperoleh pada suhu 150ËšC, 30 menit yaitu perolehan biomassa sebesar 35,97 %, delignifikasi sebesar76,74 % dan yield etanol terhadap TKKS awal sebesar 15.17 % (b/b).

PEMBENTUKAN, PENGUJIAN AKTIFITAS DAN SELEKTIFITAS BEBERAPA KATALIS PREKURSOR DARI SENYAWA "Ru-KETENILIDINE/SiO2" Achmad Hanafi Setiawan
Jurnal Kimia Terapan Indonesia Vol 7, No 1-2 (1997)
Publisher : Research Center for Chemistry - LIPI

The catalyst precursor of Ru3CCO/Si02, RU3C:/SiO2 and RU3:/SiO2 had been identified by "Temperature-Programmed Desorption(TPD)-FTIR-insitu" techniques. The last two precur- sors show a reversible reaction with CO, but the RU3CCO/SiO2 is rather unstable. Test of precursors with C2H4, shows that Ru3CCO/SiO2 produced trans-C4Hg, RU3:/SiO2 produced cis-C4Hg and the RU3C:/SiO2 yielded C3H6, selectively.

PEMANFAATAN KITIN I KITOSAN SEBAGAI BAHAN ANTI MIKROBA R. Sarwono
Jurnal Kimia Terapan Indonesia Vol 12, No 1 (2010)
Publisher : Research Center for Chemistry - LIPI

Chitin is a natural polymer which consists in the living thing such as shrimp, crabs, lobsters, yeast, insect and fungi. Chitin is usually produced fromshellfish such as shrimp shell, crabs, lobsters. They are demineralization of crustacean using strong acid OT base. Deacetilization of chitin using strong base and heating gave chitosan. Chitosan has many application such as food preservation, anti microbial, water treatment, anti oxidation, and fat absorption. Anti microbial products such as sport dressing, hand globt;linen, and anti virus and antracnose of red chili pepper. Anti bacterial of chitosan come from the amine functional group, that strong positive charge. Membrane of cell has negative charge. Interaction between positive and negative charge resulted membrane permeable suffer osmotic pressure which affect to the equilibrium inside the cell, it may cause theinhibition the growth of the microorganisms. There is also hydrolysis occurs to the cellwall that may cause the leak of electrolyte from the cell, it may cause the cell becomedead.Key words : crustacean waste, chitin, chitosan, anti bacterial

EKSTRAKSI DAN FRAKSINASI KOMPONEN BIOAKTIF ANTIMIKROBA DALAM BIJI INTISARI DAN DAUN LADA Lenny Sutedja; Herlina Agustina
Jurnal Kimia Terapan Indonesia Vol 4, No 2 (1994)
Publisher : Research Center for Chemistry - LIPI

In the framework of antimicrobial activity investigation, seeds and leaves of black pepper were fractionated with n-hexane, methanol, chloroform and water consecutively, to isolate the active fractions. The antimicrobial activity was determined by agar plate diffusion method against Staphylococcus aureus ATCC 6536, Escherichia coli ATCC 25922 and Candida albicans ATCC 10231. Antimicrobial activity against the microbes was not found in the pepper leaf extracts as well as in the n-hexane extract of the seeds. Methanol, chloroform and water extracts of pepper seeds showed antimicrobial activity against S.aureus and Calblcans, however they did not show any activity against E.coli. The chloroform extract, which was the most active, was further eluted and fractionated by column chromatography on silica gel, eluted gradually with n-hexanetethylacetate. Antimicrobial activity determination of the fractions obtained from the column chromatography, indicated that fraction L(IV) showed the highest activity. Gas chromatography-mass spectrometry analysis of L(IV) illustrated the possibility of the presence of several compounds, such as piperonal; palmitic acid, stearic acid, oleic acid, B-sitosterol and 2(3H)-furanone, 3,4-bis (l,3-benzodioxol-5-ylmetyl) dihydro.

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