Application of diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) for the identification of potential diagenesis and crystallinity changes in teeth
Application of diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) for the identification of potential diagenesis and crystallinity changes in teeth
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DOI：
10.1016/j.microc.2003.11.006
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发表时间：
2004-02-01
影响因子：
4.8
通讯作者：
Amarasiriwardena, D
中科院分区：
文献类型：
--
作者：
Greene, EF;Tauch, S;Amarasiriwardena, D
在埋藏过程中，成岩蚀变会使古饮食特征失效，而这些特征是由牙釉质等增量组织中的羟基磷灰石(Ca-5（PO4)(3)OH）基质提供的。因此，能够评估成岩变化的分析方法在人类学和考古学调查中至关重要。利用漫反射红外傅立叶变换光谱（DRIFTS）分析了来自墨西哥索利斯和埃及卡拉马的现代乳牙釉质（脱落），以及来自（现代）阿联酋的Tell Abraq的青铜器时代（约公元前2200年）成人牙釉质，以及来自曼哈顿下城的纽约非洲人墓地（NYABG）的成人牙釉质。将样品与合成羟基磷灰石粉末和骨灰样品进行了比较。牙釉质的DRIFTS光谱在吸光度和Kubelka-Munk单位上与先前基于颗粒的FTIR光谱产生相似的红外指纹图案。该研究表明，在考古调查中，DRIFTS是一种方便的替代基于颗粒的透射FTIR测试硬组织成岩变化的方法。牙釉质样品比合成羟基磷灰石和骨灰标准样品含有更高的碳酸盐-磷酸盐比率。结晶度指数（CIAb）与碳酸盐-磷酸盐比、锶-钙比和氟峰外观之间存在相关性。结晶度指数（CIAb）在2.6 ~ 3.8（吸光度单位）之间，Kubelka-Munk结晶度指数（CIKM）在3.1 ~ 4.9之间。(C) 2003 Elsevier B.V.版权所有
During burial, diagenetic alteration can invalidate the paleodietary signature, which the hydroxyapatite (Ca-5(PO4)(3)OH) matrix in incremental tissues, such as tooth enamel, provides. Thus, analytical methods that can evaluate diagenetic changes are crucial in anthropological and archaeological investigations. Modem deciduous tooth enamel (exfoliated) from Solis, Mexico and Kalama, Egypt, as well as Bronze Age (circa 2200 B.C.E.) adult enamel from (present-day) Tell Abraq, U.A.E. and adult enamel from the New York African Burial Ground (NYABG) in lower Manhattan, were analyzed using diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). The samples were compared to synthetic hydroxyapatite powder and bone ash samples. The DRIFTS spectra of tooth enamel yielded similar infra red finger print pattern to previous pellet-based FTIR spectra in both absorbance and Kubelka-Munk units. The study demonstrates that DRIFTS is a convenient alternative to pellet-based transmission FTIR in testing diagenetic changes in hard tissue for archaeological investigations. Tooth enamel samples contained a higher carbonate-phosphate ratio than synthetic hydroxyapatite and bone ash standard samples. Correlations are reported between Crystallinity Index (CIAb) and carbonate-phosphate ratio, strontium-calcium ratio, and fluoride peak appearance. Crystallinity indexes (CIAb) were in the range of 2.6-3.8 (in absorbance units) and Kubelka-Munk Crystallinity indexes (CIKM) were in the range of 3.1-4.9. (C) 2003 Elsevier B.V. All rights reserved.