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. Author manuscript; available in PMC: 2018 Apr 1.
Published in final edited form as: Bone. 2017 Jan 18;97:243–251. doi: 10.1016/j.bone.2017.01.015

Figure 1. FTIR spectra for human bone and the non-enzymatic cross-link, pentosidine.

Figure 1

Fourier transform infrared (FTIR) spectroscopy is able to detect chemical bonding in materials. Here, representative spectra from (a) human bone and (b) the non-enzymatic crosslink, pentosidine, are shown. The main vibrations of pentosidine refer to C=N and C=C stretching as well as C-C and C-N stretching. These non-enzymatic cross-link vibrational regions are within human bone's amide I peak (C=O and C-N stretching, 1770-1570 cm-1) and phosphate peak (C-C and C-N stretching, 1250-1100 cm-1), respectively [50,51].