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
中科院分区:
文献类型:
--
作者:
Wu,Yang;Lopez,GabrielP;Sklar,LarryA;Buranda,Tione
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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DOI:
--
发表时间:
1986
期刊:
Progress in hematology
影响因子:
--
作者:
G. Brodeur
通讯作者:
G. Brodeur
DOI:
10.1056/nejm198803103181007
发表时间:
1988
期刊:
The New England journal of medicine
影响因子:
--
作者:
Friend,SH;Dryja,TP;Weinberg,RA
通讯作者:
Weinberg,RA
DOI:
10.1016/0027-5107(84)90149-0
发表时间:
1984
期刊:
Mutation research
影响因子:
--
作者:
P. Chen;F. Imray;C. Kidson
通讯作者:
C. Kidson
DOI:
10.1016/0005-2787(81)90065-4
发表时间:
1981
期刊:
Biochimica et biophysica acta
影响因子:
--
作者:
T. Inoue;A. Yokoiyama;T. Kada
通讯作者:
T. Kada
影响因子:
--
作者:
R. Parshad;Katherine K. Sanford;GaryM. Jones;Robert E. Tarone
通讯作者:
Robert E. Tarone