2.6. MCR-ALS algorithm and software
A brief description of the MCR-ALS theory is included in the Supplementary data. The data were handled using the MATLAB computer environment [20]. The calculations involved in the mixture resolution by
MCR-ALS were carried out using MVC2, a MATLAB graphical interface
toolbox which is a new version of that already reported in the literature
[21], freely available on the Internet [22].