摘要
采用3个不同的激发波长λ=514,633和785nm对淡水养殖珍珠进行了较为系统的原位拉曼光谱研究,且与相同条件下测定的苹果蜗牛卵壳拉曼光谱进行对比,结果表明:(1)珍珠中所探测到的有机物拉曼峰频率色散明显,推测为聚乙炔类物质,而非前人所认为的类胡萝卜素;(2)苹果蜗牛卵壳中有机物为典型的类胡萝卜素,当λ变化时其拉曼峰基本无频率色散现象;(3)根据拉曼峰位置推测珍珠中聚乙炔类物质共轭CC双键的数目约为10和16,蜗牛卵壳中类胡萝卜素的共轭CC双键的数目约为13。
In situ resonance Raman spectra of Chinese freshwater pearls were collected and analysed systematically with three different excitation wavelengths at λ= 514, 633 and 785 nm. At the .same time, the Raman spectra of eggshells of Pomacea canaliculata were also collected under the same experimental conditions in order to compare with pearls＇ Raman spectra. The conclusions were as follows： （1） Frequency dispersions of Rarnan spectra of organic pigments were obviously observed in Raman spectra of pearls. In contrast, Raman spectra of organic pigments in eggshells of Pomacea canaliculata showed no frequency dispersion phenomena; （2） It was considered that the organic pigments in pearls were polyacetylenic materials but not carotenoids which was proposed by previous researchers, and the organic pigments in eggshells of Pomacea canaliculata were carotenoids; （3） The conjugated C=C number of polyacetylenic material in pearls was calculated to be about 10 and 16, and the conjugated C=C number of carotenoid in eggshells of Pomaeea canaliculata was about 13 based on the Raman shifts caused by conjugated C=C double bonds.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
2006年第1期78-80,共3页
Spectroscopy and Spectral Analysis
基金
广东省自然科学基金(000898)资助
