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All Journal The Journal of Pure and Applied Chemistry Research Molekul: Jurnal Ilmiah Kimia
Suci Amaliyah
Brawijaya University
Chemical Engineering, Chemistry & Bioengineering Chemistry Materials Science & Nanotechnology Medicine & Pharmacology

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Biosynthesis of Cu2O/CuO-NP and AgNP Using Rhizopus oligosporus as Reductor Agent Dwi Putri Woro Pamungkas; Suci Amaliyah; Akhmad Sabarudin; Anna Safitri
The Journal of Pure and Applied Chemistry Research Vol 10, No 3 (2021): Edition September-December 2021
Publisher : Chemistry Department, The University of Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jpacr.2021.010.03.594

Abstract

Nanoparticles have been widely used in various fields which depends on its size and shape. Nanoparticles can be synthesized physically and chemically. However, these methods need large amount of energy, not environmental friendly and quite expensive, because requires several additional materials besides precursors. In this study, we performed the analysis of some parameters to determine the best conditions for biosynthesis using Rhizopus oligosporus to obtain the nanoparticles with specific size. This fungi was used because easy to find, cultivate, and handle. We found that grain size of Cu2O/CuO-NP and AgNP obtained are 23 nm, 55 nm respectively. In conclusion, this study confirms that some parameters investigated and Rhizopus oligosporus can be used to obtain the nanoparticles with specific size.
SYNTHESIS AND CHARACTERIZATION OF CELLULOSE STEARATE ESTER FROM BACTERIAL CELLULOSE AND STEARIC ACID ENZYMATICALLY USING IMMOBILIZED LIPASE Suci Amaliyah
Molekul Vol 11, No 2 (2016)
Publisher : Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (299.363 KB) | DOI: 10.20884/1.jm.2016.11.2.225

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.
Co-Authors Akhmad Sabarudin Dwi Putri Woro Pamungkas Safitri, Anna