Abstract
This study investigated an alternative approach to valorizing canola
proteins by hydrolyzing them to generate amino acids (AAs).
Pre-treatment of cold-pressed (CP) cake and desolventized-toasted (DT)
meal with ethanol (99%, v/v) followed by protein separation was studied
as process optimizations to maximize protein recovery with higher
purity. The optimum ethanol pre-treatment conditions to achieve a meal
containing less than 1% oil was reached at a meal-to-ethanol ratio of
1:4 (w:w) and 50°C for 30 min extraction. The protein recovery reached
the maximum at pH 12 and a meal-to-solvent ratio of 1:10 (w:v), yielding
73% and 33% recovery from ethanol pre-treated CP and DT meals,
respectively, in a single extraction. Untreated and ethanol pre-treated
meals were hydrolyzed with 6 M HCl (protein-to-acid ratio of 5 mg:2 mL)
for 24 h at 110°C. The ethanol pre-treatment improved AA recovery and
released 373 mg AA/g dry CP meal biomass (dbm) compared to 279 mg AA/g
untreated CP cake dbm. However, no improvement in AA recovery upon
ethanol pre-treatment of DT meal. H2SO4 was examined as an alternative
acid. More than 80% of the total AAs of CP proteins were released with
3 M H2SO4, while for DT meal proteins, a 5 M concentration was needed to
achieve the same. Commercial canola meals can be utilized for generating
free AAs; however, the meal processing history may affect the yield.