Mikroenkapsulasi urea menggunakan bioblend polimer polistirena - poli(3-hidroksibutirat)

Ria, Hummam Pramiba (2018) Mikroenkapsulasi urea menggunakan bioblend polimer polistirena - poli(3-hidroksibutirat). Diploma thesis, Universitas Andalas.

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Abstract

Formulation of urea slow released fertilizers using polystyrene and poly(3- hydroxybutyrate) bioblend as matrix by microencapsulation technique have been studied. Microcapsules were prepared by solvent evaporation method. The ratio of urea and bioblend were 1:1,5, while the ratio of polystyrene and poly(3-hydroxybutyrate) were 85%:15%, 90%:10%, 95%:5% respectively. Evaluation of microcapsules included Fourier Transform Infra Red spectroscopy (FTIR), Scanning Electron Microscope (SEM), particle size distribution, amount of urea in microcapsules, release test, and release kinetic study. There was no chemical interaction between urea, polystyrene, and poly(3-hydroxybutyrate). SEM showed that microcapsules were spherical in shape. The percentages of drug loading for formula 1, 2, and 3 were 74,88%, 81,944%, and 76,16%. Particle size distribution of urea microcapsules were 0-0,2 µm. The release kinetic model of urea from microcapsules followed Korsmeyer-Peppas equation. The percentage of dissolution efficiences for each formulas were 65,0497 ± 1,464%, 71,7813 ± 1,653%, and 39,7843 ± 0,722%. Statistical analysis using One Way ANOVA showed that dissolution efficiencies among formula were different significantly (<0.05). It concludes that the difference of bioblend ratio concentration could impact urea release from microcapsules. Statistical analysis using One Way ANOVA also showed that entrapment efficiencies among formula were different significantly (<0.05). It concludes that the difference of bioblend ratio concentration could impact urea entrapment in microcapsules. Keywords : Urea, Microcapsule, Slow Release Fertilizer, Polystyrene, Poly(3- Hydroxybutyrate) , Solvent Evaporation Method

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