“…Xanthan gum is an anionic polysaccharide and, therefore, has polyelectrolyte properties due to the presence of a carboxylic group in its chemical structure. Solutions of xanthan gum as polysaccharide systems have been extensively studied in terms of physicochemical properties (Hamcerencu, Desbrieres, Popa, & Riess, 2009;Mukherjee, Sarkar, & Moulik, 2010;Rinaudo, 2004). At present, xanthan gum is one of the two widely used watersoluble polymers in tertiary oil recovery (Xu et al, 2014b).…”