Abstract
Structuring liquid oil into a self-standing semisolid material without trans and saturated fat has become a challenge for the food industry after the recent ban of trans fat by the US Food and Drug Administration and Health Canada. Lately, the use of hydrocolloids such as animal proteins and modified cellulose for oleogel preparation has gained more attention. However, plant proteins have never been explored for the development of oleogels. The present study explored the use of freeze-dried foams prepared using protein concentrates and isolates of pea and faba bean with xanthan gum at different pH values for oil adsorption and subsequent oleogelation. Compared to protein isolate stabilized foams, protein concentrate-stabilized foams displayed (i) higher oil binding capacity (OBC) due to a higher number of smaller pore size; and (ii) lower storage modulus and firmness due to the higher oil content. At all pH values, there was no significant difference between the OBC of different protein isolates, but among the concentrates, pea displayed higher OBC than faba bean at pH 5 and faba bean displayed higher OBC than pea at pH 9. Results showed that such oleogels could be used as a shortening alternative. Cakes prepared using the pea protein-based oleogel at pH 9 displayed a similar specific volume as that of shortening-based cake, although with higher hardness and chewiness.