title: Synchrotron-based XRD from rat bone of different age groups.
abstract: Synchrotron-based XRD spectra from rat bone of different age groups (w, 56 w and 78w), lumber vertebra at early stages of bone formation, Calcium hydroxyapatite (HAp) [Ca10(PO4)6(OH)2] bone fill with varying composition (60% and 70%) and bone cream (35-48%), has been acquired with 15keV synchrotron X-rays. Experiments were performed at Desy, Hamburg, Germany, utilizing the Resonant and Diffraction beamline (P9), with 15keV X-rays (λ=0.82666 A0). Diffraction data were quantitatively analyzed using the Rietveld refinement approach, which allowed us to characterize the structure of these samples in their early stages. Hydroxyapatite, received considerable attention in medical and materials sciences, since these materials are the hard tissues, such as bone and teeth. Higher bioactivity of these samples gained reasonable interest for biological application and for bone tissue repair in oral surgery and orthopedics. The results obtained from these samples, such as phase data, crystalline size of the phases, as well as the degree of crystallinity, confirm the apatite family crystallizing in a hexagonal system, space group P63/m with the lattice parameters of a=9.4328Å and c=6.8842Å (JCPDS card #09-0432). Synchrotron-based XRD patterns are relatively sharp and well resolved and can be attributed to the hexagonal crystal form of hydroxyapatite. All the samples were examined with scanning electron microscope at an accelerating voltage of 15kV. The presence of large globules of different sizes is observed, in small age groups of the rat bone (8w) and lumber vertebra (LV), as distinguished from, large age groups (56 and 78w) in all samples with different magnification, reflects an amorphous phase without significant traces of crystalline phases. Scanning electron microscopy (SEM) was used to characterize the morphology and crystalline properties of Hap, for all the samples, from 2 to 100μm resolution.
authors.affiliation: Science Based Applications to Engineering (SBAI), Physics Division, University of Rome "La Sapienza", Via Scarpa 10, 00161 Roma, Italy. Electronic address: dvrao_9@yahoo.com.
authors.forename: D V
authors.initials: DV
authors.lastname: Rao
authors.affiliation: Science Based Applications to Engineering (SBAI), Physics Division, University of Rome "La Sapienza", Via Scarpa 10, 00161 Roma, Italy.
authors.forename: G E
authors.initials: GE
authors.lastname: Gigante
authors.affiliation: Istituto di Matematica e Fisica, Università di Sassari, Via Vienna 2, 07100 Sassari, Italy.
authors.forename: R
authors.initials: R
authors.lastname: Cesareo
authors.affiliation: Istituto di Matematica e Fisica, Università di Sassari, Via Vienna 2, 07100 Sassari, Italy.
authors.forename: A
authors.initials: A
authors.lastname: Brunetti
authors.affiliation: Hercules Laboratory, University of Evora, Portugal.
authors.forename: N
authors.initials: N
authors.lastname: Schiavon
authors.affiliation: Department of Bio-System Engineering, Faculty of Engineering, Yamagata University, Yonezawa-shi, Yamagata 992-8510, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Akatsuka
authors.affiliation: Department of Bio-System Engineering, Faculty of Engineering, Yamagata University, Yonezawa-shi, Yamagata 992-8510, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Yuasa
authors.affiliation: Allied Health Science, Kitasato University, 1-15-1 Kitasato, Sagamihara, Kanagawa 228-8555, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Takeda
mesh_terms: D000818:Animals; D001842:Bone and Bones / Q000737:chemistry*; D003460:Crystallization; D017886:Durapatite / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D051381:Rats; D017356:Synchrotrons; D014961:X-Ray Diffraction
chemical_list: D017886:Durapatite
keywords: Crystal structure; Different age groups; Diffraction; Phase; Rat bone; SEM; Synchrotron; X-rays