“…Numerous pore-forming agents have been investigated, including starch (Zivcová et al, 2012;Khattab et al, 2012;Garrido et al, 2011;Chen et al, 2011;Zivcová et al, 2009;Zivcová et al, 2010;Gregorová et al, 2006), graphite (Sarikaya and Dogan, 2013;Sanson et al, 2008;Ding et al, 2007;Boaro et al, 2003), lycopodium (Zivcová et al, 2007;Zivcová et al, 2008;Seržane et al, 2010), sucrose (Sarikaya andDogan, 2013: Ray et al, 2010;Wang et al, 2005) and polymethyl methacrylate Yao et al, 2005;Kumar et al, 2005) and others (Bai et al, 2012;Horri et al, 2012 andSilva et al, 2002). Even though starch is the most frequently used pore forming agent, possibly due to its biological origin and availability, the difficulties in maintaining the pore structure formed by the starch burn out, and the narrow size range of commercially available starch types (typically between 5 and 50 μm) limits its application when large pores are desirable .…”