首页> 美国卫生研究院文献>Proceedings of the National Academy of Sciences of the United States of America >Photoelectric properties and detection of the aromatic carcinogens benzaapyrene and dimethylbenzanthracene.
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Photoelectric properties and detection of the aromatic carcinogens benzaapyrene and dimethylbenzanthracene.

机译:苯并a py和二甲基苯并蒽的芳族致癌物的光电性能和检测。

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摘要

The absolute photoelectron quantum yield spectra for benzo[a]pyrene and dimethylbenzanthracene are presented in the wavelength range 180--230 nm. These polycyclic aromatic carcinogens have photoelectron quantum yields of approximately 2 x 10(-3) electrons per incident photon at 180 nm. The quantum yields fall off quickly and monotonically at wavelengths longer than 210 nm (5.9 eV). Threshold values for benzo[a]pyrene and dimethylbenzanthracene are 5.25 +/- 0.06 cV and 5.27 +/- 0.04 eV, respectively. The photoelectron quantum yields of benzo[a]pyrene and dimethylbenzanthracene are several orders of magnitude greater than typical components of biological membranes (amino acids, phospholipids, and polysaccharides). Preliminary micrographs of benzo[a]pyrene and dimethylbenzanthracene sublimed onto poly(L-lysine) and onto dimyristoyl phosphatidylcholine demonstrate the high contrast of small crystallites of carcinogens against a background of membrane components. These results and calculations involving relative contrast factors suggest that the distribution of these carcinogens in biological membranes can be determined by using photoelectron microscopy.
机译:苯并[a] py和二甲基苯并蒽的绝对光电子量子产率谱在180--230 nm波长范围内显示。这些多环芳族致癌物在180 nm处每个入射光子的光电子量子产率约为2 x 10(-3)个电子。在大于210 nm(5.9 eV)的波长处,量子产率迅速而单调下降。苯并[a] py和二甲基苯并蒽的阈值分别为5.25 +/- 0.06 cV和5.27 +/- 0.04 eV。苯并[a] py和二甲基苯并蒽的光电子量子产率比生物膜的典型成分(氨基酸,磷脂和多糖)大几个数量级。升华到聚(L-赖氨酸)和二肉豆蔻酰基磷脂酰胆碱上的苯并[a] py和二甲基苯并蒽的初步显微照片表明,致癌物小晶体在膜成分背景下具有高对比度。这些结果和涉及相对对比因素的计算表明,这些致癌物在生物膜中的分布可以通过使用光电子显微镜来确定。

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