Sensitivity limits for determining 1:1 binding constants from spectrophotometric titrations via global analysis
Sensitivity limits for determining 1:1 binding constants from spectrophotometric titrations via global analysis
复制标题
通过全局分析从分光光度滴定确定 1:1 结合常数的灵敏度极限
DOI:
10.1002/cem.3119
复制
发表时间:
2019
影响因子:
2.4
通讯作者:
Vander Griend, Douglas A.
中科院分区:
文献类型:
--
作者:
Kazmierczak, Nathanael P.;Chew, Joyce A.;Michmerhuizen, Anna R.;Kim, Seong Eun;Drees, Zachary D.;Rylaarsdam, Andrew;Thong, Tasha;Van Laar, Luke;Vander Griend, Douglas A.
The simultaneous nonlinear regression modeling of multiple wavelengths of spectrophotometric data allows binding constants to be determined with much higher precision than in previous single‐wavelength methods; however, this method of global analysis has intrinsic limitations as well. Through Monte Carlo simulations on UV‐vis titration data using various types of experimental errors, we demonstrate how the precision of binding constant calculation deteriorates under very strong binding regimes, as quantified by the productK[H]o. We show that for a 1:1 binding model, global analysis can be reliably performed whenK[H]o< 1000, representing a significant improvement over previous recommendations. The relative impacts of different sources of error as well as the degree of overlap in molar absorptivity curves are quantified. Even under optimal conditions, errors in initial concentrations of the titration solutions are found to have the most impact on error in the calculated binding constant, while instrumental noise is largely weeded out by the global analysis technique. We propose experimental diagnostics indicating when the model has lost sensitivity to the binding constant and derive a novel experimental design formula for maximizing the precision of the binding constant calculation. The results imply the need to develop robust and accessible uncertainty estimation techniques competent to deal with concentration errors and asymmetric confidence intervals.
登录
查看更多内容
影响因子:
--
作者:
J. M. Beechem
通讯作者:
J. M. Beechem
DOI:
--
发表时间:
1985
期刊:
Talanta: The International Journal of Pure and Applied Analytical Chemistry
影响因子:
--
作者:
H. Gampp;Marcel Maeder;Charles J. Meyer;A. Zuberbühler
通讯作者:
A. Zuberbühler
DOI:
--
发表时间:
2006
期刊:
影响因子:
--
作者:
Sarah Norman;M. Maeder
通讯作者:
M. Maeder
影响因子:
4
作者:
Hall, Benjamin R.;Manck, Lauren E.;Ward, Michael D.
通讯作者:
Ward, Michael D.
DOI:
10.1002/9780470661345.smc018
发表时间:
2012
期刊:
Proceedings of the National Academy of Sciences
影响因子:
--
作者:
P. Thordarson
通讯作者:
P. Thordarson