[EN] METHOD AND KIT FOR ISOTOPE-LABELLING OF A FOLATE-CONTAINING BIOLOGICAL SAMPLE FOR MASS SPECTROMETRY [FR] PROCÉDÉ ET KIT DE MARQUAGE ISOTOPIQUE D'UN ÉCHANTILLON BIOLOGIQUE CONTENANT DU FOLATE POUR SPECTROMÉTRIE DE MASSE
[EN] SUBSTITUTED TRICYCLIC AMIDES, ANALOGUES THEREOF, AND METHODS USING SAME [FR] AMIDES TRICYCLIQUES SUBSTITUÉS, ANALOGUES DE CEUX-CI ET PROCÉDÉS LES METTANT EN OEUVRE
Detection of the Sulfhydryl Groups in Proteins with Slow Hydrogen Exchange Rates and Determination of Their Proton/Deuteron Fractionation Factors Using the Deuterium-Induced Effects on the <sup>13</sup>C<sub>β</sub> NMR Signals
three-bond isotope shifts. By virtue of the well-separated signals, the proton/deuteron fractional factors for both the SH and amide groups of the two Cys residues in EPPIb could be directly determined, as approximately 0.4-0.5 for [SD]/[SH] and 0.9-1.0 for [ND]/[NH], by the relative intensities of the NMR signals for the isotopomers. The proton NOE's of the two slowly exchanging SH's were clearly identified
Synthesis of site-specifically 13 C labeled linoleic acids
作者:Adam R. Offenbacher、Hui Zhu、Judith P. Klinman
DOI:10.1016/j.tetlet.2016.08.071
日期:2016.10
the formation of alkylhydroperoxides. While previous labeling strategies have focused on deuterium labeling to ascertain the primary and secondary kinetic isotope effects for this reaction, there is an emerging interest and need for selectively enriched 13C isotopologues. In this report, we present synthetic strategies for site-specific 13Clabeled linoleic acid substrates. We take advantage of a Corey-Fuchs
and DFT-calculated IR spectra of n-Bu4M (M = Si, Ge, Sn, Pb), (CH3CH2CH213CD2)4Sn, and n-BuAuPPh3-d15 are reported and assigned. The asymmetric CHstretchingvibration of the CH2 group adjacent to the metal atom appears as a distinct shoulder at ∼2934 cm–1, whereas for other CH2 groups it is located at ∼2922 cm–1. The characteristic peak at ∼2899 cm–1 is attributed to an overtone of a symmetric CH2 bend
报告了n -Bu 4 M(M = Si,Ge,Sn,Pb),(CH 3 CH 2 CH 2 13 CD 2)4 Sn和n -BuAuPPh 3 - d 15的观察值和DFT计算的IR谱,并且已分配。与金属原子相邻的CH 2基团的不对称CH拉伸振动在〜2934 cm –1处表现为明显的肩峰,而对于其他CH 2基团,其位于〜2922 cm –1处。在〜2899 cm –1处的特征峰归因于对称CH 2的泛音在〜1445 cm –1处弯曲。在n -BuAuPPh 3 - d 15中,丁基的CH拉伸振动向较低的频率偏移约10 cm –1,并提供了两种可能的合理化方法。