W. M. Keck FT-ICR Mass Spectrometry Laboratory, Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695, USA.
J Am Soc Mass Spectrom. 2009 Nov;20(11):2006-12. doi: 10.1016/j.jasms.2009.07.019. Epub 2009 Aug 7.
PC-IDMS experiments for two peptides, laminin nonapeptide and the N-terminal tryptic peptide of prostate specific antigen, were performed utilizing a variety of alkylating reagents. These experiments were conducted to investigate how hydrophobicity influences the limits-of-detection (LOD) by altering their electrospray ionization response. Nonpolar surface areas were calculated for both peptides and all alkylating reagents to provide an estimate of the hydrophobicity of the differently alkylated peptides. Decreases in LOD by 2-fold were observed for both peptides between the best and worst performing combination of alkylating reagent. However, while an increase in hydrophobicity was found to aid in decreasing LOD to an extent, beyond a certain hydrophobicity, we observed a decrease.
针对两种肽(层粘连蛋白九肽和前列腺特异性抗原的 N 端胰蛋白酶肽)进行了 PC-IDMS 实验,使用了多种烷化试剂。这些实验旨在通过改变它们的电喷雾电离响应来研究疏水性如何影响检测限(LOD)。为两种肽和所有烷化试剂计算了非极性表面积,以提供对不同烷化肽疏水性的估计。在最佳和最差烷化试剂组合之间,两种肽的 LOD 均降低了 2 倍。然而,虽然发现疏水性的增加有助于在一定程度上降低 LOD,但超过一定的疏水性后,我们观察到 LOD 降低。