The Use of Low Ammonia Concentration in the Radiochemical Purity Test of [153Sm]Sm-EDTMP by Using the Thin Layer Chromatography Method

Radiochemical purity testing of [153Sm]Sm-EDTMP usually uses the Thin Layer Chromatography method. The mobile phase used is a mixture of 25% ammonia and water. However, the lowest ratio of 25% ammonia in the mobile phase is unknown. Therefore, research related to the use of the lowest concentration in the radiochemical purity test of [153Sm]Sm-EDTMP is necessary. This research method includes labelling of EDTMP using Samarium-153, preparation of the mobile phase with variations in the concentration of 25% ammonia: water, radiochemical purity test and data analysis using t-test statistics. The results of this study are the concentration of 25% ammonia: water (1: 9) to (1: 200) still shows good separation with Rf of [153Sm]SmCl3 and [153Sm]Sm-EDTMP at 0.0, 1.0 respectively, whereas with a thinner concentration of ammonia indicates less optimal separation with Rf [153Sm]SmCl3 at 0.35 to 1.0. Comparison of concentrated ammonia concentrations of 1: 9 and dilute 1: 200 was performed using a statistical t-test. The results of the data analysis showed that the two methods were not significantly different, indicated by the t-value of 0.82 less than 2.78. The conclusion of this study is that the lowest concentration of 25% ammonia and water in the radiochemical purity test of [153Sm]Sm-EDTMP is 1: 200.

Penerapan Metode Single Linkage dengan Manhattan Distance Similarity dalam Mengelompokkan Trens Topik Kerja Praktik

Data laporan judul kerja praktik (KP) biasanya hanya terkumpul di perpustakaan dan jarang dipubilkasikan ke mahasiswa, hal ini menyebabkan kesulitan bagi mahasiswa yang akan mengkasesnya. Berdasarkan permasalahan tersebut, maka dibuatlah suatu program pada penlitian ini untuk pengelompokkan Trend Topik. Metode yang digunakan dalam penelitian ini adalah Manhattan Distance Similariy dan Single Linkage. Sebelum masuk tahapan text mining, perlu dilakukan perancangan diantaranya perancangan basis data dan antar muka (interface). Tahapan dan text mining adalah mengumpulkan data (collect data), penguraian teks (text mining), penyaringan teks (text filtering), pembobotan kata (calculate term count), similarity, pengelompokan, dan pengujian. Hasil dari penelitian ini adalah program yang dapat mengolah data judul KP menjadi pola kelompok Trend Topik KP. Dari 905 data yang di dapatkan, terbentuk 7 kelompok yaitu Sistem Informasi, Multimedia, Jaringan, Web, Kewirausahaan, Magang, dan Pelatihan. Tetapi dari hasil pengujian Purity Test didapatkan nilai sebesar 0,267, yang artinya Manhattan Distance Similarity dan Single Linkage kurang cocok untuk mengelompokkan Judul KP.

Isolasi Senyawa Metabolit Sekunder Ekstrak Etanol Spons Stylotella sp Asal Kepulauan Selayar

Isolation of secondary metabolite compound has been conducted from sponge Stylotella sp., Selayar Island. Stylotella sp., one of Demospongiae class sponge, is found spreading in Selayar Island. This study aims to determine secondary metabolite compounds contained in the ethanol extract of Stylotella sp. sponge by extraction, fractionation and purification methods. The purity test was carried out by three eluent systems of TLC, namely chloroform:ethyl acetate (9:1), n-hexane:acetone (9:1), and chloroform:acetone (9:1). Each eluent produced a single spot. FTIR analysis of Stylotella sp. isolate showed that the pure isolates contained alkaloid compounds with the appearance of a typical functional group of alkaloid compounds. Keywords: Alkaloids, sponge Stylotella sp, extraction Telah dilakukan isolasi senyawa metabolit sekunder dari spons Stylotella sp. asal Kepulauan Selayar. Spons Stylotella sp merupakan spons kelas Demospongiae yang ditemukan penyebarannya di Perairan Pulau Selayar. Penelitian ini bertujuan untuk mengetahui golongan senyawa metabolit sekunder yang terdapat pada ekstrak etanol spons Stylotella sp. dengan metode ekstraksi, fraksinasi dan pemurnian. Uji kemurnian dilakukan dengan uji tiga sistem eluen pada KLT yaitu kloroform:etil asetat (9:1), n-heksan:aseton (9:1), dan kloroform:aseton (9:1). Masing-masing eluen menghasilkan noda tunggal. Isolat hasil analisis FTIR menunjukkan bahwa isolat murni mengandung senyawa alkaloid dengan munculnya gugus fungsi khas senyawa golongan alkaloid. Kata kunci: Alkaloid, spons Stylotella sp., ekstraksi

ISOLASI DAN IDENTIFIKASI GOLONGAN FLAVONOID PADA EKSTRAK ETIL ASETAT DAUN GEDI (Abelmoschus manihot L.)

The purpose of this experiment was to determine the flavonoid compounds in ethyl acetat extract of gedi leaves (Abelmoschus manihot L.). In this study, the method of extraction was maceration with semipolar solvent (ethyl acetat), flavonoid phytochemical screening, separation and purity test with chromatography and then identification of the compound using FTIR and UV-Vis spectrophotometer with shear reagent method. Analysis of FTIR spectra showed some functional groups such as OH, CH aliphatic, C = O, CO alcohol, C = C aromatic, and CO ether, whereas the analysis with UV-Vis spectra indicated the presence of band I at a wavelength of 409.4 nm and 238.40 nm for band II which is the auron specific wavelength. After the addition of shift reaget, there was a substitutions of OH groups in C-4, C-6 and C-3' and OR at C-4'. The flavonoid compounds contained in ethyl acetate extract of gedi leaf is suggested to be auron, 3',4,6-trihydroxy,4-alkoxy-auron. Keywords: auron, ethyl acetat extract, flavonoids, gedi leaf, isolation

MODIFICATED EXTRACTION AND PURITY TEST OF ARENGA PINNATA GUM

Objective: The purpose of this study is modificated extraction method to obtain gum from Arenga pinnata Merr. and their purity test.Methods: Gum has been extracted from palm seed using distilled water by centrifugation and warming. Characterization of gum was done by scanning electron microscopy-energy dispersivse X-ray and spectrophotometer infrared. Gum refluxed with HCl 2 N for 14 h would be the monomer. Galactose and mannose were used as standard. Purity test was done by the thin-layer chromatography (TLC) and Luff Schoorl method.Results: The study results obtained that the modification methods (4.8%) and centrifugation (4.6%). Identification of functional groups with the spectrophotometer infrared provided the same spectrum forms between the two methods. Purity test by TLC with the best eluen butanol: ethanol:water 2:2:2. Luff Schoorl’s method gives results of 87.46%, whereas the raw comparison galactose-mannose standard 96.69%.Conclusions: The modification method gives more results with the same purity rate as the centrifugation method.

Sintesis dan Uji Aktivitas Antibakteri Senyawa N-Fenil-3,4-Diklorobenzamida (Synthesis and Antibacterial Activity Assay of N-Phenyl-3,4-Dichlorobenzamide)

In this research, the synthesis of N-phenyl-3,4-diklorobenzamida was carried out by reacting 1,3-diphenylthiourea and 3,4-dichlorobenzoil chloride via bimolecular nucleophilic substitution reaction (SN2). The assays for the obtained compound product were purity test (tested by TLC and melting point tester), chemical and physical characterization (shape, color, and solubility), confirmation of the compound and structure (performed by UV-Vis spectrophotometer, FTIR spectrometer, 1H-NMR and 13C-NMR). The result showed that the compound was synthesized successfully with a yield of 42%, then the in vitro test of antibacterial activity against Staphylococcus aureus ATCC 6538 and Pseudomonas aeruginosa ATCC 27853 was conducted by well diffusion method. The compound N-phenyl-3,4-dichlorobenzamida did not have antibacterial activity which showed by the absence of inhibition diameter. Keywords: 1,3-diphenylthiourea, N-phenyl-3,4-dichlorobenzamide, nucleophilic substitution, antibacterial