Abstract
Modification of starch using lactic acid oligomer has been carried out. Modification has been manufactured via a three-step reaction. Step one is to synthesize lactic acid oligomer by reflux and heating lactic acid at 160⁰C for 4 hours, equipped with the dean-stark trap. The second step is the esterification of lactic acid oligomer with acetic acid to eliminate hydroxyl group of lactic acid oligomer at 100⁰C for 4 hours using sulphuric acid as catalyst and equipped with the dean-stark trap. The last step reacted starch with lactic acid oligomer acetate to produce modified starch using catalyst triethylamine. The characterization of the product obtained was conducted by analysis FTIR, NMR, and GPC. The new absorption peak at FTIR spectra from –C=O and –(C=O)-O-C-bond and new chemical shift at NMR spectra of modified starch indicated the esterification between starch and lactic acid oligomer acetate had been conducted.
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