Abstract
ABSTRACT Modification of bacterial cellulose through enzymatic esterification between cellulose and propionic acid has been carried out to produce cellulose propionate as raw material of dialysis membrane. The research aimed to characterize of cellulose propionate and assess its potency as raw material for membrane. The esterification was performed for 8 hours at 50 ⁰C with cellulose and propionic acid in mass ratio of 1:5. The physical chemical properties of resulted cellulose propionate were determined for functional group using FTIR, crystallinity index by XRD, swelling index by gravimetric method, specific gravity, maximum pore size diameter and membrane thickness. The cellulose propionate showed peak absorbance at wave number of 1743 cm -1 from C=O absorption and 1108 cm -1 and 1037 cm -1 from C-O absorption with degree of crystallinity of 61.56% and density of 1.39 g/cm 3 . Cellulose propionate membrane has maximum poressize of 2.25 ± 0.04 µm and thickness of 0.029 ±0.001mm, the swelling index of 153%. Diffusion equilibrium of uric acid was 3 hours at average diffusion rate of 1.48ppm/h. Keywords : Bacterial cellulose, cellulose propionate, characteristic, diffusion rate
Highlights
Membrane is defined as selective barrier between two phases, feed and permeate
Spectrophometer, crystalline index by X-Rays diffraction (XRD) and the cellulose propionate membrane was measured its porous diameter by bubble point
FTIR spectra for both bacterial cellulose and cellulose propionate are depicted in Figures 1 and 2
Summary
Membrane is defined as selective barrier between two phases, feed and permeate. Separation process occurs because of material transportation between feed phase to permeate phase derived of driven force. Modification of bacterial cellulose can be done through esterification which reacting bacterial cellulose and carboxylic acid in presence of catalyst. The lipase is used in the form of immobile to separate the product and enzyme at the end of reaction, the enzyme can be reused. Optimum temperature of Mucormiehei lipase activity is 500C. Cellulose propionate is ester of bacterial cellulose that produced by reacting bacterial cellulose and propionic acid in the optimum ratio of 1:5 with immobilized lipase and nbuthanol for 18 hours. The cellulose propionate can be applied as raw material membrane, it has to be characterized. This research will characterize cellulose propionate and its application for dialysis membrane for glucose and uric acid. The dialysate was determined for uric acid by conductivity and glucose by UV-Vis spectrophotometry
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