Jurnal Kimia Terapan Indonesia (Indonesian Journal of Applied Chemistry)
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ISOLASI DAN KARAKTERISASI SENYAWASENYAWA PEMANIS DARI DAUN SAGA MANIS ( ABRUS PRECATORIUS L.)
No full textThe 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
POLAROGRAFI DENYUT UNTUK PENENTUAN KADAR EMAS DALAM LARUTAN CAMPURAN DENGAN TEMBAGA DAN PERAK TANPA PROSES PEMISAHAN
No full textPulse Polarographic determination of gold (- 2 ppm) in a solution mixture with the presence of silver and copper ion without separation has been examined. Utilizing the suitable condition, polarographic peaks of gold, silver and copper were separated and thus could make the determination of gold possible in a solution with silver and copper ions. From the investigations carried out, several conclusions were derived i.e. : 1. A system of KOH 1,5M, KN03 0,02 M and KCN 0,01M, which was then called the complexing and supporting electrolyte mixture or "Elektrolit Pendukung Pengkompleks Campuran (EPPC)'; appeared to be capable to remove the interference of copper and silver peaks from the gold polarogram peak area in tile Derivative Pulse Polarography. 2. The capabilities of this EPPC are used to determine the concentration of gold in the range of 2 to 10 ppm. The determination was carried am by the Derivative Pulse Polarography in a solution mixture with 30 ppm of silver and copper ion. Preliminary application of the EPPC system to the analysis of gold in a rock sample was observed and the result was compared with Neutron Activation Analysis metho
PEMBUATAN ASPAL EMULSI YANG TAHAN-SIMPAN
Get PDFCold Mixed Asphalt Emulsion generally used for roadmaintenance, such as film Slurry Seal to cover cracked roadsurface, Patching, Dense Graded Emulsion Mixed (DGEM) andOpen Graded Emulsion Mixed (OGEM) for road pavement.One of several obstacles using asphalt emulsion, is the shorttime of storage stability, less than three months. This problem hasan effect to road maintenance especially for District road thathave light traffic.Asphalt emulsion is made 0f: bitumen, kerosene, emulsifier,HCI, CaCl, and watel: Asphalt emulsion has pH of 2,5 to 4%.To mix the component of asphalt emulsion a Colloid Millequipment is used, which has a rotation of 1000 until 6000 rpm,and has a gap between rotor and stator of250 um unti/500 um,so the asphalt emulsion product has a particle > 250 ~Wl.To make a longer storage stability oj asphalt emulsion, usingtwo method s i.e:1. By experiment, to make various contents of asphalt emulsionbase materials and do the test using a standard test oj ASTMD 244-90 until six months.2. To make various contents of asphalt emulsion base materials,not only measure the rate stability by Stoke 'sformula, but alsoperform the test until six months.The result of method 1(1) the components of asphalt emulsionare: 65% of bitumen, 2,8% of kerosene, 0,48% of emulsifier.0,48% of HCI, 0,3% of CaCl, and 30,94% of water, after sixmonths the test result still hove comply with the spesijication ofAASHTO M 208.The result of method 2(2), the rate stabiliy have aroun d of18 x 10-7 until 35 x 10-7 cm/second,From ten formulas using method 2, three still stand until sixmonths. The selected formula was made in a drum, and was testeduntil six months
Preparation of Alkyl Halide as Intermediate Compound in Synthesis Cationic Surfactant Alkyl Trimethyl Ammonium Chloride
No full textCationic surfactant alkyl trimethyl ammonium chloride was synthesized by quartenerisation of tertiary amines. Materials used in quartenerization are tertiary amine and alkyl halide. Alkyl halide is a hydrocarbon derivative in which one or more hydrogen is replaced with halogen. In this research, thionyl chloride is used as a reactant . Thionyl chloride (SOCl2) is often used because it is easier to make, the yield is greater and byproducts are volatile. Alkyl halide is synthesized from the reaction of hexadecyl alcohol with thionyl chloride (SOCl2) at a temperature of 80 C for 24 hours in a reflux reactor. This study managed to get hexadecyl chloride from the reaction hexadecyl alcohol and thionyl chloride. It can be seen from the results of FTIR, LC/MS and GC/M
ANTIBACTERIAL ACTIVITY OF FRACTIONATED SANDALWOOD OILS
Get PDFSandalwood 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
