“…There are numerous examples of starch esters prepared by reactive extrusion, and there have been many studies on the preparation of starch phosphates by reactive extrusion of dry or semi-dry mixtures of starch with orthophosphates or metaphosphates (Landerito and Wang, 2005 ;O'Brien et al ., 2009 ;San Martin-Martinez et al ., 2004 ;Seker et al ., 2003 ). Fatty acid esters of starch, including starch acetates, starch succinates, starch alkenylsuccinates, starch maleates and starch palmitate, have been prepared by extrusion of starch with anhydrides, sometimes in the presence of sodium hydroxide or sodium bicarbonate (NaHCO 3 ) as catalyst (Hannah and Fang, 2002 ;Murua-Pagola et al ., 2009 ;Raquez et al ., 2008 ;Rudnik and Zukowska, 2004 ;Wang et al ., 1997 ).…”