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MOLECULAR MODELING OF CATIONIC PORPHYRINS AS LIGAD OF RADIOPHARMACEUTICAL KIT

Journal of Chemistry Vol. 5, No. 1 Januari 2011
Publisher : Journal of Chemistry

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Abstract

Cationic porphyrins and their interactions with DNA have become an important concern due to its role as a photosensitizer in photodynamic therapy for cancer treatment. However, this therapy technique has the disadvantage, i.e. its inability to document photographically the fluorescence observed endoscopically. The present research aims to observe the change in molecular level of cationic porphyrins which labeled by radionuclides emitting ? particle and ? radiation. Molecular models of 5,10,15,20-tetrakis-[3.4-bis (carboxymetylenoxy) imidazoliumyl] porphyrin (T3,4BCImP), 5,10,15,20-tetrakis-[3,4-bis (carboxymetylenoxy) pirazoliumyl] porphyrin (T3,4BCPzP) and its complexes which labeled by Tc and Re radionuclides were optimized and calulated by density functional theory methods (DFT). Atomic charges were calculated with natural population analysis/NPA method. The calculation result showed that Tc-T3,4BCPzP has the highest photosensitivity and the strongest affinity to DNA. Carboxylate groups of meso-subtituent of porhyrins lead to label cationic porphyrins by Tc and Re as radiopharmaceutical ligand candidates .

DEVELOPING METHOD OF DIFFERENTIAL PULSE POLAROGRAPHIC FOR ANALYSIS OF CHLORAMPHENICOL RESIDUE IN MILK

Indonesian Journal of Chemistry Vol 4, No 1 (2004)
Publisher : Universitas Gadjah Mada

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Abstract

A differential pulse polarographic method for a quantitative analysis of chloramphenicol residue in milk had been developed. Result showed that the method using dropping mercury electrode as working electrode, Ag/AgCl electrode as reference electrode, and platinum electrode as auxiliary electrode with an acetic buffer solution of pH 4.7 as supporting electrolyte had a recovery for chloramphenicol of (96.88 ± 3.17)% with a detection limit of 0,027 µg/mL, a quantitation limit of 0,089 µg/mL, and a determination limit of 0,010 µg/mL.   Keywords: differential pulse polarography, residue, chloramphenicol, milk

TRANSFORMASI PLASMID PTRLI DENGAN TEKNIK ELEKTROPORASI PADA ASPERGILLUS TERREUS DAN UJI STABILITAS TRANSFORMAN

Jurnal Sains dan Teknologi Indonesia Vol 14, No 1 (2012)
Publisher : Jurnal Sains dan Teknologi Indonesia

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Abstract

Aspergillus terreus is a Saprophyte fungus that produces several secondary metabolites as lovastatin (anti-cholesterol drug) and itaconic acid (a polymer material). Lovastatin is one of the statin class of drugs that have efficacy as antihypercholesterolemic. Plasmid transformation is the introduction and incorporation of exogenous plasmid into cells orprotoplast. In this study, pTRLI plasmid (pTRI inserts containing lovE gene as a regulator gene in the biosynthesis of lovastatin) will be transformed by electroporation transformation. The purpose of this research is transformation of pTRLI plasmid into protoplasts of Aspergillus terreus by electroporation and obtain stable transformants. The research was initiated by isolation of pTRLI plasmid. Then pTRLI plasmid was determined purity and concentration by nanodrop. Furthermore, Protoplasts of Aspergillus terreus were isolated enzymatically by adding an enzyme which can degrade the cell wall of Aspergillus terreus which contains chitin and cellulose. PTRLI plasmid were transformed into protoplasts of Aspergillus terreus by electroporation. These transformants were grown in Czapek-Dox medium containing pyrithiamine agar and the number of transformants mg-1 of pTRLI plasmid was calculated. Transformants were selected to grow in Czapek-Dox medium containing piritiamin 1 mg l-1. The number of transformants produced 187 transformants mg-1 of PTRLI plasmid. Transformants are stable up to five generations by growing the transformants in Czapek-Dox medium agar containing piritiamin 1 mg l-1. The success of the transformation indicated by ptrA gene in transformants that can be amplified by PCR. The size of fragment DNA is 801 bp.

Transformasi Plasmid pTRLI ke dalam Protoplas Aspergillus terreus dengan Penambahan Polietilenglikol

JURNAL ILMU KEFARMASIAN INDONESIA Vol 10 No 1 (2012): JIFI
Publisher : Fakultas Farmasi Universitas Indonesia

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Abstract

Transformasi plasmid merupakan proses masuknya plasmid ke dalam protoplas atau sel inang yang mengakibatkan perubahan materi genetika. Tujuan dari penelitian untuk mentransformasi plasmid pTRLI ke dalam protoplas Aspergillus terreus dan menentukan stabilitas transforman. Penelitian diawali dengan isolasi plasmid pTRLI, penentuan kemurnian dan konsentrasi plasmid pTRLI dengan menggunakan serapan pada panjang gelombang 260 dan 280 nm dari alat nanodrop. Kemudian, protoplas A. terreus diisolasi secara enzimatik dengan enzim kitinase, selulase, dan maserosim. pTRLI ditransformasi ke dalam protoplas A. terreus dengan penambahan kalsium klorida dan polietilenglikol. Transforman ditumbuhkan dalam media Czapek Dox agar yang mengandung piritiamin 1 mg/L. Jumlah transforman yang dapat tumbuh antara 12 sampai 19 transforman/µg plasmid pTRLI. Transforman dideteksi dengan mengamplilikasi gen ptrA yang berukuran 801 pb. Dari penelitian ini, dapat disimpulkan bahwa PEG dapat digunakan untuk mentransformasi plasmid pTRLI ke dalam protoplas A. terreus dan transforman stabil sampai generasi ke S.