Spectroscopic characterization of streptavidin functionalized quantum dots.

Spectroscopic characterization of streptavidin functionalized quantum dots.
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链霉亲和素功能化量子点的光谱表征。

DOI:
10.1016/j.ab.2007.02.007
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发表时间:
2007
影响因子:
2.9
通讯作者:
Buranda,Tione
Buranda,Tione
中科院分区:
生物学4区
文献类型:
--
作者:
Wu,Yang;Lopez,GabrielP;Sklar,LarryA;Buranda,Tione

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量子点的光谱特性会受到其合成条件的强烈影响。在这项工作中,我们表征了商业链霉亲和素功能化量子点(来自 Invitrogen 的 QD525,批号 1005-0045 和 QD585,批号 0905-0031)的几种光谱特性。这是开发校准珠的第一步,该校准珠用于流式细胞术或显微镜应用中多个荧光标签的通用量化方案。我们使用光吸收、光激发和发射光谱以及激发态寿命测量来表征它们的光谱行为,重点关注在生物应用中重要的 400 至 500 nm 波长范围。我们的数据显示发射光谱、寿命和量子产率 (QY) 对激发波长的异常依赖性,这在 QD525 中尤其明显。对于 QD525,QY 值范围从 480nm 激发时的 0.2 到 450nm 时的 0.4,再到 350nm 时的 0.15。对于 QD585,QY 值在 500 至 400 nm 之间恒定为 0.2,但在 350 nm 处降至 0.1。我们将波长依赖性归因于 QD525 中尺寸和表面缺陷的异质性,这与之前化学文献中描述的特征一致。讨论结果的背景是弥合目前已知的量子点物理化学文献与生物应用中检测开发的定量需求之间的差距。
The spectroscopic properties of quantum dots can be strongly influenced by the conditions of their synthesis. In this work, we have characterized several spectroscopic properties of commercial, streptavidin functionalized quantum dots (QD525, lot 1005-0045, and QD585, lot 0905-0031, from Invitrogen). This is the first step in the development of calibration beads to be used in a generalizable quantification scheme of multiple fluorescent tags in flow cytometry or microscopy applications. We used light absorption, photoexcitation, and emission spectra, together with excited state lifetime measurements, to characterize their spectroscopic behavior, concentrating on the 400- to 500-nm wavelength ranges that are important in biological applications. Our data show an anomalous dependence of emission spectrum, lifetimes, and quantum yield (QY) on excitation wavelength that is particularly pronounced in the QD525. For QD525, QY values ranged from 0.2 at 480nm excitation up to 0.4 at 450nm and down again to 0.15 at 350nm. For QD585, QY values were constant at 0.2 between 500 and 400nm, but they dropped to 0.1 at 350nm. We attribute the wavelength dependencies to heterogeneity in size and surface defects in the QD525, consistent with characteristics described previously in the chemistry literature. The results are discussed in the context of bridging the gap between what is currently known in the physical chemistry literature of quantum dots and the quantitative needs of assay development in biological applications.
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