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Future Journal of Pharmaceutical Sciences
Fig. 5 | Future Journal of Pharmaceutical Sciences

Fig. 5

From: Fourier-transformed infrared spectroscopy, physicochemical and biochemical properties of chondroitin sulfate and glucosamine as supporting information on quality control of raw materials

Fig. 5

FT-IR spectra of glucosamine sulfate potassium chloride (GlcN) samples of the suppliers. a Spectra of all samples analyzed from supplier 1 (S1), and the red line represents the average curve. b Spectra of all samples analyzed from supplier 2 (S2), and the red line represents the average curve. c Comparative analyses of peak areas of different bands of GlcN samples between the suppliers. Bands related to OH (> 3000 cm− 1), the amine group on each ring structure (1500–1700 cm− 1), S=O (1230 cm− 1), and C–O (1200–1000 cm− 1) stretching were selected. The statistical analyses were performed using the Mann-Whitney test. Values are expressed as mean ± SD (p < 0.05)

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