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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 8 Documents

Search results for , issue "Vol 3, No 1 (1993)" : 8 Documents clear

STUDI PEMISAHAN Co(II), Cu(II), Fe(III) DAN Ni(II) SECARA EKSTRAKSI PELARUT DENGAN ZAT PENGKOMPLEKS NATRIUM DIETILDITIOKARBAMAT Soefjan Tsauri; K. Anom W; Buchari Buchari
Jurnal Kimia Terapan Indonesia Vol 3, No 1 (1993)
Publisher : Research Center for Chemistry - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jkti.v3i1.278

Sodium diethyldithiocarbamate (NaDDC) as a chelating agent reacts unselectively with cobalt(II), copper(II), iron(III) and nickel(II). Their maximum wavelengths are very similar in carbon tetrachloride solution and hence these complexes could not be determined by UV/VIS spectrophotometer without prior separation. A scheme of separation has been found for qualitative analysis of cobalt(II), copper(II), iron(III) and nickel(II) at a certain pH using a specific masking agent. It was found that pH 9 turned out to be the best condition for iron(III) masking but neither for cobalt(II), nor for copperill] and nickel(II). The addition of 10 mL HCI 12 N to the complex solutions of Co(II), Cu(II) and Ni(II) would remove Cu(II) and Ni(II) complexes from CC14 to water phase whereas Co(II) complex was still in the CCl4 phase. Cu(II) and Ni(II) ions in the water phase were then treated with 10 mL Titriplex 8,66 x 10-5 mole at pH 9 in which Ni(II) was masked but not Cu(II).

BIOSENSOR UNTUK ANALISIS UREA BERDASARKAN PADA APLIKASI ENZIM UREASE DAN ELEKTRODA TUNGSTEN Bambang Widihastono
Jurnal Kimia Terapan Indonesia Vol 3, No 1 (1993)
Publisher : Research Center for Chemistry - LIPI

This study describes the development of a potentiometric biosensor for the determination of urea. The sensor was constructed by combining a tungsten wire with an enzyme, urease, physically immobilized in polyvinylchloride (PVC). The fabrication of the sensor was carried out by coating a tungsten wire with the immobilized urease. The changes in pH resulted from the enzyme-catalyzed hydrolysis of urea is measured with the tungsten electrode and shown to be proportional to the log of concentration of urea in sample solutions over a limited concentration range. Urea Sensor prepared in this study gives an almost linear response with the log of concentration in the range of 0.1 - 10.0 mM, and the calibration slope wasfound to be 52 mV Vper decade change in urea concentration.

PENENTUAN RUNUTAN Cu, Cr, Mn dan Fe DALAM MATRIKS AIR LAUT DENGAN SPEKTROFOTOMETRI SERAPAN ATOM DAN EKSTRAKSI PELARUT Ardeniswan Ardeniswan; Sumardi Sumardi
Jurnal Kimia Terapan Indonesia Vol 3, No 1 (1993)
Publisher : Research Center for Chemistry - LIPI

A method has been studied for the analysis of trace metals such as Cu, Cr, Mn, Fe in artificial seawater matrix samples using atomic absorption spectrophotometric (AAS). Concentration of theSe metals was carried out by extraction using methyl isobutyl ketone (MIBK) after being reacted with complexing agents, and transfered into aqueous solution by backextraction using 4 N nitric acid. The metal complexing agents used were ammonium pyrrolidinedithiocarbamate (APDC), sodium diethyldithlocarbamate (Na-DDC), mixture of equal ratio of APDC and Na-DDC. From these study it was found that use of APDC gave recovery for Cu, Cr, Mn and Fe 104.4; 25.4; 0; 83.0 % respectively at pH 5, while use of Na-DDC gave 83.5; 89.0; 79.4 and 81.3 % , respectively at the same pH. A mixture of equal ratio of APDC and Na-DDC was found to gave recovery for Cu, cr, Mn and Fe of 104.6; 103.9; 102.1 and 101.2 %, respectively at pH 5.

ANTIBACTERIAL ACTIVITY OF FRACTIONATED SANDALWOOD OILS A. T. Karossi; H. Agustina; L. Sutedja
Jurnal Kimia Terapan Indonesia Vol 3, No 1 (1993)
Publisher : Research Center for Chemistry - LIPI

Sandalwood oil was prepared through water distillation of sandalwood (Sansalum album L) sawdust. The inhibitory activity of the oil was tested against Staphylococcus aureus and Bacillus cereus. This antibacterial active oil was further fractionated through column chromatography into five fractions. Larger antibacterial activity, expressed as inhibitory diameter ( ID ), was observed in the prepared sandalwood oil and its fractions compared to sandalwood oil originated from Kupang and sanialol from International Flavors and Fragrance ( IFF ). The inhibitory diameter of the isolated sandalwood oil against S. aureus and B. cereus were 8.75 and 8.20 mm respectively. While the IV of sandalwood oil from Kupang and santalol IFF against S aureus were 7.20 and 7.23 mm, and against B. cereus 6.62 and 7.35 mm respectively. The ID of the sandalwood oil fractions against S aureus ranged between 7.32 - 9.93 mm, and the largest inhibition was shown by fraction -2. Against Bicereus the IV ranged between 7.64 - 11.12 mm., and the largest inhibition was shown by fraction - 1. Suggested possible structures for sandalwood oil fractions were based on the infra red spectra of the oils and sandalwood oil components.

THE USE OF TITRIMETRIC, NELSON SOMOGYI AND HPLC METHODS FOR THE ANALYSIS OF CASHEW APPLE JUICE FERMENTATION BROTHS Julia Kantasubrata; A. T. Karossi; A. S. Pramudi
Jurnal Kimia Terapan Indonesia Vol 3, No 1 (1993)
Publisher : Research Center for Chemistry - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jkti.v3i1.295

In cashew apple juice fermentation to produce wine and vinegar, analysis of organic acids and sugars in fermentation broths is very important, due to the fact that optimum conditions of fermentation could only be established from results obtained on monitoring the concentrations of those components during the fermentation process. Analysis of organic acids by tiirimetric method and analysis of sugars by Nelson-Somogyi method only give a total amount of acids and sugars. HPLC is one of the promising method for determining the acids/sugars individually, although this method needs costly facilities such as columns and so/vents. In this work, organic acids were separated by HPLC on a u-Bondapak C1B column using aqueous solution of 2% NH4H2O4 as the mobile phase, while sugars were separated on silica-based column using an eluent containing a polyamine reagent. In this investigation the results of determination of organic acids by titrimetric method and those of sugars by Nelson-Somogyi method were compared respectively with the results of individual organic acids and sugars obtained from the HPLC methods. It was found that for organic acids, results of the determination using the titrlmetric method is correlated linearly with the results of acetic acid obtained by the HPLC methods. The same results were obtained for total and reducing sugars determination by the Nelson-Somogyi and individual sugar by the HPLC methods. The regression equation obtained for each of the organic acids and sugars can be used for the estimation of each of the respective components present in the cashew apple juice fermentation broths based on the results obtained from both titrimetric and Nelson-Somogyi methods. For routine monitoring of large number of fermentation broth samples, the proposed method was found to be a better alternative to the more castly HPLC method.

ISOLASI DAN KARAKTERISASI SENYAWASENYAWA PEMANIS DARI DAUN SAGA MANIS ( ABRUS PRECATORIUS L.) Siti Isnijah S.P.; Sri Hartati; Leonardus B.S.Kardono
Jurnal Kimia Terapan Indonesia Vol 3, No 1 (1993)
Publisher : Research Center for Chemistry - LIPI

The sweet principles of A.precatorius leaves had been claimed as glycyrrihizin compound. The recent publication however showed that A. precatorius leaves, plant materials collected in Miami (Florida-USA), do not contain glycyrrhizin. The sweet tasting compound are triterpene cycloortan« glycosides, i.e : abrusoside A.B,C and D, having sweetness potencies in the range 30-100 times greater than sucrose. Compare to theA.precalorius leaves from Miami (Florida - USA), the glycosides of A. precatorius leaves collected in Bandung, (Indonesia), showed different thin layer chromatographic performance. By using techniques of bioactivity guided fractionation, some sweet compounds in A.precatorius leaves from Bandung could be isolated and characteriud. These compounds may be potential for sugar substitution for the diet of diabetic and obesitic patients.

APLIKASI MEMBRAN DALAM PEMEKATAN ENZIM GLUKOAMILASE A. Syahril; S Nana; L. Z. Udin; A. Sidik; A. T. Karossi
Jurnal Kimia Terapan Indonesia Vol 3, No 1 (1993)
Publisher : Research Center for Chemistry - LIPI

Preparation of glucoamylase enzyme by fermentation of sago and soy bean meals had been done. Enzyme concentration was carried out by ultrafiltration process, where polysulfone membranes were used as medium filter. Membranes used in this experiment were prepared with several treatments, such as coagulation temperature and composition and beside that effect of solvent and additive are also observed. From the results of the observation during fermentation process in enzyme preparation, its clear that pH of solution changed in that pH increased with increasing fermentation time. The highest enzyme activity was shown on the sixth day of fermentation namely 2.908 U/ml with a specific enzyme activity of 1495.8 U/g protein. There is fluctuation in protein content during [ermenuuion process, but the highest level was obtained on the tenth day [ermenuuion (3.102 mg/l). The highest specific enzyme activity was shown on the sixth day fermentation (1495.8 U1g protein). The best membrane for the enzyme concentration by ultrafiltration process in this experiment are found form the membrane prepared from dimethyl acetamide as solvent and polyvinylpyrrolidane as additive. This membrane gave rejection coefficient of more than 90% andflux as much as 20.571 l/m2.hour.

PENGAMATAN ANGKA PEROKSIDA DAN ANGKA ASAM DALAM MEDE GORENG SELAMA PENYIMPANAN Siti Isnijah S.P.; Jamilah Jamilah; Hilyati Hilyati
Jurnal Kimia Terapan Indonesia Vol 3, No 1 (1993)
Publisher : Research Center for Chemistry - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jkti.v3i1.296

Cashew nut is a kind of seed consumed usually as fried snack food. Deterioration due to oxidative rancidity as well as hydrolisis of fat may decreas the quality of the fried cashew nut. In this paper the peroxide value and acid value of fried cashew nut during storage is discussed. Peroxide value and acid values were determined by titrimetrlc method while the change of unsaturated fatty acids were analyzed by using gas chromatography after transformation into methyl esters. Such analysis subjected to fried cashew nut using several kinds of frying oil, namely: palm oil, coconut oil and mixed palm and soybean oils. Sample was analyzed immediately after frying process (t=O), after 2 weeks (t=2) , 4 weeks (t=4) and 6 weeks (t=6) in storage. The peroxide values of the raw cashew nut and fried one using palm oil were high at t=6, 98.91 and 91.21 meqlkg oil respectively while the values of fried cashew nut using coconut oil for mixed palm oil with soybean oil have decreased, namely 28.85 or 8.62 meqlkg oil respectively. The acid values of raw cashew nut, the fried ones using coconut oil and mixed palm oil wilh soybean oil increased up to t=4, namely: 1.96%, 1.62% and 1.45% respectively. However, acid value of fried cashew nut using palm oil decreased, this was 1.25%.

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