Byproducts from quinoa are not yet well explored sources of hemicellulose or products 23 thereof. In this work, xylan from milled quinoa stalks was retrieved to 66% recovery by 24 akaline extraction using 0.5 M NaOH at 80°C, followed by ethanol precipitation. The 25 isolated polymer eluted as a single peak in SEC with a molecular weight > 700 kDa. 26 Analysis by FT-IR and NMR, combined with acid hydrolysis to monomers, showed that the 27 polymer was built of a backbone of β-(1→4) linked xylose residues that were substituted 28 by 4-O-methylglucuronic acids, arabinose and galactose in an approximate molar ratio of 29 114:23:5:1. NMR analysis also indicated presence of α-(1→5) linked arabinose 30 substitue... More