Lia Destiarti
Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Tanjungpura, Pontianak 78114

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Senyawa Aktif Antiinflamasi dari Kulit Batang Pasak Bumi (Eurycoma longifolia Jack) Ari Widiyantoro; Indri Kusharyanti; Lia Destiarti; Elvi Rusmiyanto Pancaning Wardoyo
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 12, ISSUE 2, August 2011
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

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Abstract

Pasak bumi (Eurycoma longifolia Jack) merupakan salah satu famili Simaroubaceae yang mengandung senyawa kimia dengan aktivitas biologik yang potensial.Penggunaannya di masyarakat selama ini hanya terbatas sebagai aprodisiaka, namun beberapa penelitian menunjukkan ditemukannya senyawa kimia dengan aktivitas sebagai antimalaria, antikanker dan antioksidan. Penelitian ini mengungkapkan adanya senyawa kimia yang bersifat antiinflamasi dengan tinjauan reduksi radang pada kaki tikus yang terinduksi karagenan. Hasil penelitian diperoleh suatu senyawa quassinoid yang bersifat antiinflamasi yaitu eurycomaosida, namun aktivitasnya lebih rendah dibanding indometasin sebagai kontrol positif.   Kata Kunci : Eurycoma longifolia Jack, antiinflamasi, udema, karagenan, quassinoid
Isolasi dan Karakterisasi Senyawa Kimia dari Kulit Batang Manggis (Garcinia mangostana Linn) Isolation and Characterization of Chemical Compound from Bark of Mangosteen (Garcinia mangostana Linn) Lia Destiarti; Ari Widiyantoro; Elvi Rusmiyanto; Maryati Maryati; Harlia Harlia; Ratu Safitri; Unang Supratman
Jurnal Ilmu dan Teknologi Kayu Tropis Vol 7, No 2 (2009): Jurnal Ilmu dan Teknologi Kayu Tropis
Publisher : Masyarakat Peneliti Kayu Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (236.098 KB) | DOI: 10.51850/jitkt.v7i2.231

Abstract

The purpose of this research is to isolate and characterize chemical compound from bark of mangosteen. Bark of mangosteen was macerated with methanol. The extract from that process was fractionated with n-hexane, methylen chloride, and ethyl acetate. Ethyl acetate fraction was separated and purified by vacuum column chromatography, gravitation column chromatography, and preparative thin layer chromatography. The relative pure compound was afforded from ethyl acetate fraction of mangosteen bark (8.5 mg) resulting from 1.5 kg of mangosteen bark. The yellow amorphous powder of compound melts at 114 ~ 116ºC (uncorrected). The purity of compounds was tested by 1 and 2 dimension thin layer chromatography which gave one spot on TLC plate. The ultraviolet-visible (in CH3OH solvent) spectrum showed absorption maximum at 318 nm (sinamoyl group/band I), 258 (shoulder), and 243 nm (benzoyl group/band II). Addition of NaOH caused batochromic shift of band I and band II predicted as two hydroxyl at C-4’ and C-7, respectively. The infrared spectrum displayed absorption bands of OH stretching at  3436 cm-1, C-H stretching at 2920 cm-1, C=O stretching at 1631 cm-1, C-O-C stretching at 1094 cm-1, and C-H aromatics bending at  970-800 cm-1. A molecular ion in the FABMS at m/z 271.36 [M+H] + was consistent for the molecular formula C15H10O5. The 1H NMR spectrum showed characteristic resonances of a flavone. Based on the result of phytochemical test and analysis of the spectrum, it is predicted that the compound belongs to flavone, a kind of flavonoids which has hydroxyl at C-5, C-7, and C-4.
The Effect of Cell Surface Area on the Effectivity and Reusability of Bixin Sensitized Solar Cells Anissa Bella Maharani; Lia Destiarti; Winda Rahmalia
POSITRON Vol 12, No 1 (2022): Vol. 12 No. 1 Edition
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam, Univetsitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (735.67 KB) | DOI: 10.26418/positron.v12i1.53409

Abstract

Dye-Sensitized Solar Cells or DSSC is the latest solar cell type generation that uses natural dyes as sensitizers. Bixin extracted from the seeds of kesumba (Bixa orellana L) is one of the natural dyes that can be used as a sensitizer. This study aims to determine the effect of the active surface area of solar cells on the effectivity and reusability of bixin-sensitized solar cells based on their open-circuit voltage (Voc), short-circuit current (Isc), and maximum energy conversion efficiency. The results of this study will provide an overview of the best surface area to produce DSSC with the highest maximum energy conversion efficiency and the lifetime of bixin sensitized solar cells. The measurement results showed that the resulting Voc for each variation of the surface area 1, 2, and 3 cm2 was 344; 719; 1002 mV under intensity 100 mW cm-2, while the Isc produced under the same intensity was 0.223; 0.471; 0.680 mA. Based on the calculation results, the maximum power generated by each surface area was 0,077; 0,338; 0,681 W.  This means that the larger the active surface area of the solar cell, the greater the voltage and current generated. In this work, the highest efficiency was produced by solar cells with a surface area of 2 cm2, which is 0.085%. The solar cells fabricated in this study can be reused for five days under continuous irradiation.