Fig. 2From: Fourier-transformed infrared spectroscopy, physicochemical and biochemical properties of chondroitin sulfate and glucosamine as supporting information on quality control of raw materialsBland-Altman analysis of the pH and density for the chondroitin sulfate (CS) samples of S1 and S2 vs. pharmacy. Analyses of pH values for S1 (a) and S2 (b). Analyses of density values for S1 (c) and S2 (d). S1, supplier 1; S2, supplier 2; Ph (S1), pharmacy analyses from supplier 1 samples; Ph (S2), pharmacy analyses from supplier 2 samplesBack to article page