Karakterisasi kulit kayu tingi (Ceriops tagal) sebagai bahan penyamak nabati

Tingi (Ceriops tagal) bark was highly potential as tanning materials due to high tannin concentration. The aim of the study was to determine the characterization of properties of tanning material made from tingi bark, including the tannin levels, the non-tannin levels, the tannin type, the absorption level of the solution and the FTIR spectrum analysis. The method used in this research was countercurrent system in the extraction process, feed solution preparation process, the thickening process, powder formation process conducted with the aid of Rotavapor- 151 Standard, and testing. The results showed that the tingi bark contains tannin level 70.91% and non-tannin levels 10.63%. Tannins from tingi bark were classified as procyanidin condensed tannins type and the absorption values obtained maximum value at wavelength 490 nm. The FTIR spectral data indicated that tingi tannins contained hydroxyl group (? O-H; ? N-H) in the area (3467.418-3057.025) cm-1, aromatic group (? C-H) in the area of 2875,733 cm-1, ? C=O (ester group in tanned material) in the area (1747.442-1612.422) cm-1, ?-OH; R-COO-in the area of 1444.626 cm-1 and ?(SO4)2 -; R-SO3; R-SO3H in the area (1112.823-1062.729) cm-1.