Total protein content
The protein content of the snack bars was determined using the
Bradford colorimetric assay (Bradford, 1976). BSA solutions in
water at five different concentrations (ranging from 0 to
1000 lg/ml) were used as standards to establish a calibration
curve.
All the snack bar sample residues (derived from the total DF assay)
were redissolved in Milli-Q water (10 mg/ml), out of which an
aliquot (100 ll) was mixed with diluted Bradford reagent (3 ml).
The resultant mixture was vortexed (15 s) and allowed to stand
at room temperature for 5 min before the absorbance at 595 nm
was recorded.