The uronic acid (UA) content of raw (uncooked) and cooked
pastas was determined (in duplicate) according to the procedures
of Sun-Waterhouse et al. (2010). UA was measured colorimetrically
at 525 nm using the method of Filisetti-Cozzi and Carpita (1991)
after hydrolysis of the extract by concentrated sulphuric acid and
reaction of the hydrolysate with m-hydroxydiphenyl. A calibration
curve of D-galacturonic acid was also established for quantifying
the UA contents.