SYNTHESIS AND CHARACTERIZATION OF CELLULOSE STEARATE ESTER FROM BACTERIAL CELLULOSE AND STEARIC ACID ENZYMATICALLY USING IMMOBILIZED LIPASE
Journal Title: Molekul - Year 2016, Vol 11, Issue 2
Abstract
The aims of this study were to determine the optimum conditions of enzymatic esterification between stearic acid with bacterial cellulose using immobilized lipase and to characterize the obtained ester. The optimum condition was observed by the effects of time and mass ratio of cellulose: stearic acid towards degree of esterification. The esterification reaction carried out in a heterogeneous system using n-butanol as solvent at 50 °C. The effect of reaction time on esterification degree is done by variating incubation time for 6, 12, 18, 24 and 30 hours. The influence of the mass ratio of cellulose: stearic acid to the esterification degree was carried out by variating 1: 1, 1: 2, 1: 3, 1: 4, 1: 5 and 1: 6. Products characterization consist of functional group analysis by Fourier Transform Infra Red (FTIR), determining degree of substitution (DS) by saponification, swelling index by gravimetric method, and cristallinity by X-Ray Diffraction (XRD). The results showed that condition of esterification was optimum in 18 hours of reaction with mass ratio 1:5. The success of esterification was confirmed by FTIR spectrum that showed ester carbonyl peak at 1718.46 cm-1 . DS of cellulose stearate ester was 0.35. The swelling and crystallinity index of cellulose stearate was smaller than bacterial cellulose.
Authors and Affiliations
Suci Amaliyah
Keywords
Related Articles
- EP ID EP609317
- DOI 10.20884/1.jm.2016.11.2.225
- Views 71
- Downloads 0
Silica Content and Structure from Corncob Ash with Various Acid Treatment (HCl, HBr, and Citric Acid)
In this study, a simple method to obtain silica from corncob ash has been investigated using a nonthermal and thermal method. The Nonthermal method was done by various acid treatment with HCl, HBr and citric acid at room...
Subchronic Toxicity of Methanol Extract From Erythrina Variegata (Leguminosae) Leaves on Male Wistar Rats (Rattus Norvegicus)
Erythrina variegata is a herbal plant commonly used in Indonesia traditional medicine for treatment malaria disease. Acute toxicity test results showed that the methanol extract of E. variegata leaves categorized as prac...
Biosythesis of Silver Nanoparticles using Putri Malu (Mimosa pudica) Leaves Extract and Microwave Irradiation Method
In this paper, the biosynthesis of silver nanoparticles (AgNPs) using Mimosa pudica extract is discussed. Mimosa pudica leaves extract using water as solvent was used as bio-reductor to an aqueous solution of silver nitr...
3-Mercaptopropionic Acid as Corrosion Inhibitor for Carbon Steel in CO2 Aerated 1% NaCl Solution with Buffer Control-pH
In this research, 3-Mercaptopropionic acid (MPA) as corrosion inhibitor of carbon steel in CO2 aerated 1% NaCl solution with buffer pH adjustment has been studied by means of electrochemical impedance (EIS) and polarizat...
GALLIC ACID: A PHENOLIC ACID AND ITS ANTIOXIDANT ACTIVITY FROM STEM BARK OF CHLOROFORM EXTRACTS OF SYZYGIUM LITORALE (BLUME) AMSHOFF (MYRTACEAE)
A phenolic acid had been isolated from chloroform soluble fractions of a methanol extract of stem bark of Syzygium litorale, Fam. Myrtaceae. The structure of the isolated compound was elucidated and established as gallic...