Analisis gugus fungsi, distribusi, dan ukuran partikel tinta stempel dari ekstrak gambir (Uncaria gambir Roxb) dengan senyawa pengomplek NaOH dan Al2(SO4)3

Abstract

Gambier is one of natural materials that can be used as raw material for ink production. This study aims to see how far the influence of NaOH and Al 2 (SO 4) 3 to the functional groups, distribution, and particles size of stamped ink from gambier. The research on the manufacture of stamp ink from gambier with the compound of NaOH and Al 2 (SO 4) 3 compounds was carried out in two stages. The first stage is the preparation of gambier extract by dissolving the raw gambier with water solvent, drying, powder extraction with alcohol solvent. The second stage is formulation the NaOH complexing (35%, 30%, 25%, 20%, 15%) and Al 2 (SO 4) 3 (35%, 30%, 25%, 20%, 15%) for every 35% gambier extract in ethanol. Analysis of stamp inks is the determination of functional groups, distribution and particle size. The results showed that the best stamped ink was found with 15% NaOH complexing compound, because the values of particle size and polydispersity index (pdi) were the lowest from all treatments, as a result the ink obtained did not clot. gambier; NaOH; Al 2 (SO 4) 3 ; stamp ink