Abstract: We extracted the mannan from palm kernel expeller and analyzed its structure in this study.The residue of palm pulp was chosen as raw material and we used adopts alkali method to extract mannan from palm meal.And UV spectrum,thin layer chromatography,infrared spectroscopy,and 1H NMR methods were used to conduct a preliminary analysis of the product.The testing results showed that the different concentration of sodium hydroxide have different extraction rate.When the sodium hydroxide gets 10 %,the concentration of alkali mannan is highest and achieve about 20% of the dry weight;the UV spectrum analysis showed that extraction has high purity;Thinlayer chromatography (TLC) analysis showed that completely acid hydrolysate of mannose was mannose;Infrared spectrum and the 1H NMR spectroscopy analysis showed that the extracted mannan has significantly polysaccharide characteristics.Hence we can draw a conclusion the mannan extracted from palm kernel expeller by using alkali method is βD mannan.

Key words: palm meal, mannan, extract, structural analysis