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Jurnal Kimia (Journal of Chemistry)
Published by Universitas Udayana
ISSN : 19079850     EISSN : 25992740     DOI : 10.24843/JCHEM
Core Subject : Science,
Chemistry
Jurnal Kimia (Journal of Chemistry) publishes papers on all aspects of fundamental and applied chemistry. The journal is naturally broad in scope, welcomes submissions from across a range of disciplines, and reports both theoretical and experimental studies.
Arjuna Subject : Kimia(semua kategori) - Kimia (Lain-Lain)
Articles 12 Documents
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Search results for , issue "Vol. 5, No. 2 Juli 2011" : 12 Documents clear
SENYAWA ANTIMAKAN TRITERPENOID ALDEHID DALAM BIJI SIRSAK (Anonna muricata Linn) Sri Rahayu Santi
Jurnal Kimia (Journal of Chemistry) Vol. 5, No. 2 Juli 2011
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

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Abstract

Isolation and identification of active antifeedant compounds from sirsak seed (Anonna muricata Linn) has been carried out. As much as 13 g of concentrated methanol extract was resulted from 1.9 kg dried sirsak seed that was macerated using methanol. Further, this extract was partitioned with n-hexane to obtained 2 concentrated extracts in n-hexane and methanol. The result of antifeedant test of both extracts showed that n-hexane extract was more active than methanol extract.Separations of n-hexane extract using column chromatography (stationary phase: silica gel 60 and mobile phase: ethylacetate-chloroform 5:2) resulted in three fractions with FA fraction as the most active antifeedant (84,6% at 1600 ppm concentration).The identification using phytochemical test and spectrophotometer analysis showed that the isolate (FA. fraction) was triterpenoid aldehyde compound which absorbed at 227.6 nm, 275.1 nm and it had functional groups such as C-H stretching vinyl (3008.7 cm-1), two bands C-H streching aliphatic (2923.9 and 2854.5 cm-1) showing aldehyde group, and carbonyl group C=O (1743.5-1712,7 cm-1).
PENGARUH KECEPATAN PUTAR PENGADUK DAN WAKTU OPERASI PADA EKSTRAKSI TANNIN DARI MAHKOTA DEWA Primata Mardina; Eka N. Astarina; Septriani Aquarista
Jurnal Kimia (Journal of Chemistry) Vol. 5, No. 2 Juli 2011
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (189.331 KB)

Abstract

Tannin is one of the chemical compounds which contained in mahkota dewa fruit. The experiment investigated the effects of agitation speed and operation time on percentages of tannin extracted and mass transfer coefficient of tannin extraction process from mahkota dewa. This experiment was conducted in a three neck flask which equipped with mechanical stirrer, condenser, thermometer and heater medium. The sample was heated to 50oC and maintained at that temperature during extraction. The extraction was timed as soon as the mechanical stirrer was turned on. Samples were drawn at specified time interval of 0, 15, 30, 60, 120, 180 and 240 minutes. The result showed that increasing agitation speed and operation time increased the percentage of tannin extracted and mass-transfer coefficient. The highest percentage of tannin extracted was 8,0458% at agitation speed of 700 rpm for 240 minutes and the highest mass-transfer coefficient was 0,03/minute at agitation speed 700 rpm

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