Characterization of the Phosphate Units in Rat Dentin by Solid-State NMR Spectroscopy

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• 作者：Yao-Hung Tseng ; Yi-Ling Tsai ; Tim W. T. Tsai ; John C. H. Chao ; Chun-Pin Lin ; Shih-Hao Huang ; Chung-Yuan Mou ; Jerry C. C. Chan
• 刊名：Chemistry of Materials
• 出版年：2007
• 出版时间：December 11, 2007
• 年：2007
• 卷：19
• 期：25
• 页码：6088 - 6094
• 全文大小：605K
• 年卷期：v.19,no.25(December 11, 2007)
• ISSN：1520-5002

文摘

Dentin samples of the incisor taken from Wistar rats of different ages are studied. A series of physical techniques are used to characterize the samples, with particular emphasis on ³¹P solid-state nuclear magnetic resonance. The structure of incisor dentin in rats can be described as apatite crystallites embedded in an amorphous matrix. We find that 19% of the apatite crystallites contain hydroxyl groups, which are distributed near the surface of the crystallites. The internal region of the crystallites is deficient in hydroxyl groups. As rats mature with age, there are several changes in the chemical composition of the incisor dentin: (i) the water content and phosporous amount in the amorphous matrix decrease; (ii) the amount of the phosphorus species in the apatite crystallites remains the same; and (iii) the loss of phosphorus species is accompanied by approximately the same loss of the calcium content.