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![[Figure 2]](hi5618fig2mag.jpg)
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Figure 2
FT-IR absorption spectra representative of cartilage samples exhibiting calcium (Ca2+)-containing crystals (CC), namely, carbapatite (a) and Ca2+ pyrophosphate dehydrate crystals (b). The absorption bands of carbapatite (CA) and Ca2+ pyrophosphate dehydrate (CPPD) are well documented. Regarding CA, the ν1 and ν3 P—O stretching vibration modes are measured at 960–962 cm−1 and 1035–1045 cm−1, respectively, while the O—P—O ν4 bending mode corresponds to the doublet at 602–563 cm−1. The bands at 3570 and 633 cm−1, corresponding to the stretching and vibrational modes of the OH— groups characteristic of hydroxyapatite, are absent from CA. Regarding m-CPPD, O—P—O bending is recorded at 535 cm−1 and 508 cm−1. P—O stretching vibrations correspond to absorptions at 923 cm−1 and 991 cm−1, whereas asymmetric stretching vibrations give rise to absorptions at 1037 cm−1 and 1089 cm−1. |
![[Figure 2]](hi5618fig2.jpg)
 | JOURNAL OF SYNCHROTRON RADIATION |
ISSN: 1600-5775
