Reflectance near-infrared spectroscopic method with a chemometric technique using partial least squares multivariate calibration for simultaneous determination of chondroitin, glucosamine, and ascorbic acid.


A reflectance near-infrared (RNIR) spectroscopy method was developed for simultaneous determination of chondroitin (CH), glucosamine (GO), and ascorbic acid (AS) in capsule powder. A simple preparation of the sample was done by grinding, sieving, and compression of the powder sample for improving RNIR spectra. Partial least squares (PLS-1 and PLS-2) was… (More)