Two-dimensional vibrational correlation spectroscopy ofin vitro hydroxyapatite maturation

The Effects of Template Rigidity and Amino Acid Type on Heterogeneous Calcium-Phosphate Mineralization by Langmuir Films of Amphiphilic and Acidic β-Sheet Peptides

“…PFD-5 displayed a broad band at >1090 cm –1 , which may be attributed to PO 4 3– groups in amorphous calcium phosphate. , The 1037 cm –1 band, which appears distinct in the spectra, represents the strongest peak of octacalcium phosphate (OCP), carbonated apatite, and stoichiometric apatite . The absorption peak at 920 cm –1 may be assigned to the υ 1 P–O symmetric stretches. , Additionally, absorption peaks observed in the 560–600 cm –1 region may be assigned to υ 4 P–O asymmetric bending mode. , The spectrum of PFE-5 shows similar features to that of PFD-5, with slightly enhanced intensity. The PPS spectrum appears weaker in general, as compared to the spectra of the other two peptides, and shows a main absorption band at ∼1037–1056 cm –1 and with almost no signal in the >1090 cm –1 region, which is characteristic of nonapatitic and amorphous calcium phosphate forms …”

“…26,28 Additionally, absorption peaks observed in the 560−600 cm −1 region may be assigned to υ 4 P−O asymmetric bending mode. 30,31 The spectrum of PFE-5 shows similar features to that of PFD-5, with slightly enhanced intensity. The PPS spectrum appears weaker in general, as compared to the spectra of the other two peptides, and shows a main absorption band at ∼1037−1056 cm −1 and with almost no signal in the >1090 cm −1 region, which is characteristic of nonapatitic and amorphous calcium phosphate forms.…”

Effect of processing conditions on the crystallinity and structure of carbonated calcium hydroxyapatite (CHAp)

“…This is ascribed to partial crystallization of the powder. 44 The shift and changes in the FWHM of the characteristic band of the PO 4 3− group were shown by Ou-Yang et al 45 when the maturation of HAp from amorphous apatite was investigated. The spectra also exhibited very weak and broad bands located in the regions of 1120-1960 cm −1 and 490-430 cm −1 .…”

γ‐Fe2O3@HAp@PBABMD@Cu magnetic nanoparticles: Efficient, green, and recyclable novel nanocatalyst for the synthesis of densely functionalized pyrrole‐pyrido[2,3‐d]pyrimidine hybrids

“…A signal at 1,631 cm −1 formed by C N double bond approves that the organic linker was properly immobilized onto the surface of the catalyst and coordinated to Cu(II) ion through the lone pair of azomethine nitrogens (Figure 2c). 14,48,49 The EDX spectra of the γ-Fe 2 O 3 @HAp@PBABMD (a) and γ-Fe 2 O 3 @HAp@PBABMD@Cu MNPs (b) are presented in Figure 3. The spectra (Figure 3a) clearly shows the presence of Fe, C, N, Ca, and P in γ-Fe 2 O 3 @HAp@PBABMD magnetic nanoparticles, which is further confirmation for the anchoring of the PBABMD linker on the surface of γ-Fe 2 O 3 @HAp.…”