It is known that second-order data arising from chromatographic
measurements with DAD or FLD for complex multicomponent samples
can be classified as nontrilinear of type 1, e.g. elution time profiles are
not constant from run to run [12]. The three-way array built with
nontrilinear data of type 1 for a number of samples can be unfolded
into an augmented matrix which preserves the bilinearity property, if
the unfolding direction is the one corresponding to profile changes (elution time in the present case). MCR-ALS, a popular algorithm which
deals with this situation, was selected to process the data [19].