Studi awal tanin dari kulit kayu Acacia auriculiformis A. Cunn. ex Benth. dari hutan tanaman industri untuk bahan penyamak kulit

Abstract

This study aims to determine the tannin content and extraction method of the content and levels of tannin from the bark of Acacia auriculiformis A. Cunn. ex Benth. The bark is obtained from PT. Arara Abadi. The extract methods are water bath, ultrasonic bath, autoclave, reflux, and microwave. The tannin extract produced was applied as a vegetable tanning agent. The extract which is the best yield of the method used. The results showed that the highest yield was obtained by the autoclave method which was 29.65%. The results of chemical analysis of the extract produced were 52.79% tannin content, 62.40% water soluble materials. Application of the tannin extract as a vegetable tanning agent on goat skin was carried out chemical analysis, observation of physical and organoleptic properties. The quality of tanned skin was seen from the chemical properties, i.e. water content of 15.02%, 3.20% fat content, 3.44% ash content, 3.57% water soluble substances, 43.79% raw skin substances, 30.98% bonded tannins, 70.74% degree of tannage. Observation of physical properties of tanned skin were tensile strength 254.21 kg/cm2, 63.95% elongation at break, 9.27 mm zwik resistance/crack (non-broken nerf), thickness 0.9 mm, and brown color. A. auriculiformis bark extract contains tannins and potential as tanning agent.