The isotope ratio of monoterpene hydrocarbons in citrus essential oils of different origins was measured by ordinary high-resolution gas chromatography-mass spectrometry (HRGC-MS). The isotope ratio (Ir) was determined by the ratio of the isotope peak intensity (m/z 137) to the molecular mass peak intensity (m/z 136) of the monoterpene hydrocarbons. The accuracy of Ir was examined by measuring monoterpene hydrocarbon standards and 13C-labeled compounds. The isotope fingerprints based on the values of monoterpene hydrocarbons from lemon, lime and yuzu essential oils were determined. These citrus essential oils were also discriminated by a principal component analysis of their Ir data. The characteristic vectors showed that α-terpinene, β-pinene and β-phellandrene were important components for distinguishing between the citrus species. It is suggested that this technique will be applicable to evaluate the quality, genuineness and origin of citrus fruits and their products.
采用普通高分辨气相色谱-质谱法(HRGC-MS)测量了不同产地柑橘精油中单萜烯碳氢化合物的同位素比值。同位素比值(Ir)是根据单萜烃的同位素峰强度(m/z 137)与分子质量峰强度(m/z 136)之比确定的。通过测量单萜烃标准化合物和 13C 标记化合物,检验了 Ir 的准确性。根据柠檬、酸橙和柚子精油中单萜烯碳氢化合物的数值,确定了同位素指纹。此外,还对这些柑橘类精油的 Ir 数据进行了主成分分析。特征向量显示,α-萜品烯、β-蒎烯和β-黄柏烯是区分柑橘品种的重要成分。建议将该技术用于评估柑橘类水果及其产品的质量、真实性和来源。
Sato,T. et al., Journal of the Chemical Society. Perkin transactions I, 1976, p. 788 - 791
作者:Sato,T. et al.
DOI:——
日期:——
A drastic acceleration of a Diels-Alder reaction under adsorption conditions
作者:V. V. Veselovskii、A. V. Lozanova、A. M. Moiseenko、A. S. Gybin、V. A. Stim
DOI:10.1007/bf00962357
日期:1987.4
LANSBURY P. T.; ERWIN R. W.; JEFFREY D. A., J. AMER. CHEM. SOC., 1980, 102, NO 5, 1602-1608
作者:LANSBURY P. T.、 ERWIN R. W.、 JEFFREY D. A.
DOI:——
日期:——
VESELOVSKIJ, V. V.;MAKAROVA, Z. G.;LUTSENKO, A. I.;SHPIRO, N. A.;ZHULIN, +, IZV. AN CCCP. CEP. XIM.,(1988) N 4, 810-815
作者:VESELOVSKIJ, V. V.、MAKAROVA, Z. G.、LUTSENKO, A. I.、SHPIRO, N. A.、ZHULIN, +