This study is conducted to explore and utilize fresh mangosteen peel as an upcoming raw material for the production of natural dyes. The extract of fresh mangosteen peel is tested on cotton fabric by using alum as a mordanting agent who processed by pre-mordant dyeing procedure and fixation using 3 (three) different types of fixer. To obtain optimum interaction of fabric, mordant, dye and fixer, washing procedure has been performed using Turkish Red Oil (TRO) before the mordanting stage with varying washing time and repeated dyeing procedure with varying frequency of dyeing. As a result, the application of pre-mordanting dyeing method and fixation using iron (II) sulfate (FeSO 4 .7H 2 O), alum (KAI (SO 4) 2 .12H 2 O) and lime (CaO), produced very good color from mangosteen peel dyes extract. Cotton fabric that has been through the pre-mordanting dyeing procedure using dyes extract of mangosteen peel consecutively bring green, light brown, and dark brown color each on the fixation result using iron (II) sulfate, alum, and lime. Preliminary evaluation and instrumentation allow us to determine whether the application of washing time varies, the repeated frequency of immersion and the use of different fixers compound using dyes extract with similar concentration and dyeing procedure affect the color intensity of the fabric sample.

The synthesized of chloramphenicol -MIP (molecularly imprinted polymer) has been developed in many ways and many purposes. The purpose of this research was to compare the methods used for extracting chloramphenicol from its molecularly imprinted polymer (MIP) by calculating the percent of extraction in various ratio of template to monomer using chloroform as porogen. The result showed that the batch methods given a higher percent of extraction compared to the traditional methods

Asymmetric polysulfone (PSf)

No abstract

Glutaraldehyde crosslinked chitosan -silica nanobeads have been used as a support in the immobilization process of pepsin. The effect of pH, pepsin concentration, and temperature on the characteristics of both free and immobilized pepsin had been investigated in this study. The results showed that the immobilized pepsin has wider pH range, better capacity, performance and stability to high temperatures compared with those of free pepsin. The immobilized pepsin can be used for 8 to 10 times at which the activity remains 20%, whereas the free pepsin can only be used once. These results suggested promising applications of immobilized enzyme as biocatalyst.

Pada penelitian ini telah dilakukan optimasi pembuatan membran polyether imide (PEI) menggunakan metode inversi fasa terinduksi proses imersi-presipitasi. Untuk mendapatkan membran dengan morfologi permukaan, karakteristik mekanik dan permeabilitas air murni, telah dilakukan optimasi komposisi larutan cetak dan temperatur pengadukan. Optimasi dilakukan pada rentang komposisi larutan cetak PEI/NMP/NH4Cl (%b/b)  8/84/8 – 14/84/2 dan temperatur pengadukan 60 – 100 ºC. Sebagai tambahan, seluruh pembuatan membran PEI dilakukan dengan menggunakan padatan pendukung kain kasa. Hasil analisis morfologi permukaan menggunakan Scanning Electron Microscopy (SEM) menunjukkan terjadinya penurunan ukuran pori pada lapisan kulit membran PEI seiring dengan peningkatan komposisi larutan cetak dan temperatur pengadukan. Nilai modulus Young membran PEI yang dipreparasi berada pada rentang 1.124 – 1.676 N/m2 untuk komposisi larutan cetak 8/84/8 – 14/84/2 (%b/b) dan 1.443 – 1.898 N/m2 untuk temperatur pengadukan 60 – 100 ºC. Hasil analisis permeabilitas air murni menggunakan reaktor membran “Dead end” menunjukkan nilai fluks membran pada 56.611 – 101.553 L/m2.jam untuk komposisi larutan cetak 14/84/2  – 8/84/8 (%b/b) dan 48.547 – 67.245 L/m2.jam untuk temperatur pengadukan 100 – 60 ºC. Dengan demikian, dapat dikatakan bahwa, peningkatan komposisi PEI dalam larutan cetak dan temperatur pengadukan telah menghasilkan peningkatan kekuatan mekanik dan penurunan permeabilitas air murni.

This research aims to determine the effect of chloramphenicol concentration in shrimp toward the value of enrichment factor (EF) in the adsorption-desorption process using Molecularly Imprinted Polymer (MIP) as adsorbent. The enrichment factor describes how much analyte concentration is transferred from the sample to the solvent. In this research, the highest enrichment factor (EF) value was obtuined for chloramphenicol concentration of 50 ppm which was 120,086%. The Scanning Electron Microscope (SEM) analysis showed that the sizes of Blank Polymer (PB), Non-Imprinted Polymer (NIP), and Molecularly Imprinted Polymer (MIP) were 12, 18, and 23 nm, respectively. The detection limit value (LOD) was 0.0981 μg/mL, and the quantitation limit value (LOQ) was 0.3273 μg/mL. At this limit of detection (LOD) no chloramphenicol was detected in the analyzed shrimp.

Tujuan dari penelitian ini adalah untuk mengetahui pengaruh suhu pada sintesis Molecularly Imprinted Polymer (MIP) terhadap kemampuan adsorpsi kloramfenikol serta menganalisis gugus fungsional dari polimer terbaik yang telah dianalisis menggunakan Fourier Transform Infrared (FTIR). Pada penelitian ini telah dibuat MIP dengan variasi suhu sebesar 60oC, 70oC, dan 80oC menggunakan metode presipitasi dengan kloramfenikol (CAP) sebagai template, ethyleneglycol dimethacrylate (EDGMA) sebagai crosslinker, asam meakriat (MAA) sebagai monomer, asetonitril sebagai porogen, dan Benzoil Peroksida (BPO) sebagai initiator. Perbandingan CAP:MAA:EDGMA adalah 1:3:18 dengan 30 mL porogen asetonitril. Hasil dari penelitian ini menunjukkan bahwa suhu 80oC menghasilkan nilai Q adsorpsi terbaik yaitu sebesar 4,286 mg/g dengan nilai imprinting factor (IF) sebesar 5,977 dan persen ekstraksi sebesar 96,66%. Karakterisasi FTIR menunjukkan pada Non-Imprinted Polymer (NIP) terdapat serapan gugus -NO2 pada bilangan gelombang 1521.77 cm-1, sedangkan pada MIP dan Polimer Blanko (PB) tidak didapatkan serapan gugus -NO2.   Kata kunci : Molecularly Imprinted Polymer, kloramfenikol, metode presipitasi, suhu