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INDONESIA
Jurnal Matematika & Sains
Published by Institut Teknologi Bandung
ISSN : -     EISSN : -     DOI : -
Core Subject : Education,
Mathematics
Arjuna Subject : -
Articles 4 Documents
 1 
Search results for , issue " Vol 4, No 2 (1999)" : 4 Documents clear
Analisis Kadar Vanilin Dalam Buah Panili (Vanilla planifolia Andrews) Olahan Dengan Teknik Emulsi Membran Cair, Spektrofotometri dan Kromatografi Cair Kinerja Tinggi Siti Sujalmi; Supriyanto Supriyanto; Astin Astin
Jurnal Matematika & Sains Vol 4, No 2 (1999)
Publisher : Institut Teknologi Bandung

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Abstract

Vanillin contents in cured vanilla, which have been stored for two years had been analyzed by liquid membrane, UV-VIS spectrophotometry, and HPLC. The analysis result by spectrophotometry UV-VIS is higher than that of HPLC. Analysis with liquid membrane emulsion extraction gave higher results than without treatment.
Aktivitas Hipoglisemik Ekstrak Herba Sambiloto (Andrographis paniculata Nees, Acanthaceae) Soediro Soetarno; Elin Yulinah Sukandar; Sukrasno Sukrasno; Agung Yuwono
Jurnal Matematika & Sains Vol 4, No 2 (1999)
Publisher : Institut Teknologi Bandung

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Abstract

Hypoglycemic activity of hexane, ethylacetate, ethanol and aqueous extract of Andrographis paniculata herbs had been tested using glucose tolerance test. Extraction was conducted consecutively using hexane, ethylacetate and ethanol. Aqueous extract was obtained directly from the crude drug similar to the traditional use. At the dose level of 0.5 g/kg bw, hexane and ethylacetate extract did not show the hypoglycemic effect. Significant activity was shown by ethanol and aqueous extract and the activity of the latter was higher than the former.
Isolation and Purification of Dehalogenase From Pseudomonas cepacia UK7WS1 strain Tatang Hernawan; S. Soemitro S. Soemitro; H. Dewayani H. Dewayani; Tetih Tetih; W. T. Ismaya
Jurnal Matematika & Sains Vol 4, No 2 (1999)
Publisher : Institut Teknologi Bandung

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Abstract

Intracellular dehalogenase enzyme had been isolated from Pseudomonas cepacia UK7WS1 strain which was grown in MSM broth containing yeast extract (0.18 g/L) and MCPA (0,02 g/L) and incubated for 22-24 h at 30 oC. Enzyme purification was carried out by ammonium sulphate fractionation, DEAE-cellulose column chromatography and Sephadex G-75 gel filtration column chromatography. Protein purify factor achieved was 12.4 times and protein yield was 10 % w/w of the crude cell extract protein. The enzyme purity of each purification stage was monitored by SDS-polyacrylamide gel electrophoresis and resulted in one protein band for each denatured enzyme (dimeric protein of two identical subunits) and non-denatured enzyme (monomeric protein subunit).
Transisi Spin dalam Spesies Turunan Tris[2-(Pirazol-3-il)piridina]besi(II) Djulia Onggo; Kristian H. Sugiyarto
Jurnal Matematika & Sains Vol 4, No 2 (1999)
Publisher : Institut Teknologi Bandung

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Abstract

Complexes [Fe(3-pp)3][X]2.2H2O, where 3-pp = (2-(pyrazol-3-yl)pyridine, and X = I, Br, NO3, and CF3SO3, and X2 = [Fe(CN)5(NO)], have been isolated and characterized in terms of magnetic, Mössbauer, and electronic spectral properties. All the dihydrate salts which were isolated from aqueous solution are red brown, and heating up to 110 - 1600C results in decomposition for all salts except for the triflate which gives complete dehydration to the anhydrous yellow salt. At room temperature, the magnetic moment of the dihidrate salts are slightly higher than the purely low-spin value (2,0-2,5 BM). The magnetic moments change gradually parallel to the change in temperature within 90 - 363K, and this is associated with the continuous spin state - singlet (1A1)quintet (5T2) - transition in iron(II). For the yellow anhydrous triflate salt, the spin state transition occurs dramatically, being discontinuous and associated with hysteresis (Tc↓ = 229K, Tc↑= 241K ; ∆Tc = 12K ). The triflate salt also shows a termochromic nature, being yellow at room temperature and dark red-brown at low temperature.

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