title: Quantitative, equal carbon response HSQC experiment, QEC-HSQC.
abstract: Quantitative NMR has become increasingly useful and popular in recent years, with many new and emerging applications in metabolomics, quality control, reaction monitoring and other types of mixture analysis. While sensitive and simple to acquire, the low resolving power of 1D (1)H NMR spectra can be a limiting factor when analyzing complex mixtures. This drawback can be solved by observing a different type of nuclei offering improved resolution or with multidimensional experiments, such as HSQC. In this paper, we present a novel Quantitative, Equal Carbon HSQC (QEC-HSQC) experiment providing an equal response across different type of carbons regardless of the number of attached protons, in addition to an uniform response over a wide range of (1)JCH couplings. This enables rapid quantification and integration over multiple signals without the need for complete resonance assignments and simplifies the integration of overlapping signals.
authors.affiliation: Laboratory of Organic Chemistry, Department of Chemistry, University of Helsinki, P.O. Box 55, FI-00014 University of Helsinki, Finland.
authors.forename: Valtteri
authors.initials: V
authors.lastname: Mäkelä
authors.affiliation: Laboratory of Organic Chemistry, Department of Chemistry, University of Helsinki, P.O. Box 55, FI-00014 University of Helsinki, Finland.
authors.forename: Jussi
authors.initials: J
authors.lastname: Helminen
authors.affiliation: Laboratory of Organic Chemistry, Department of Chemistry, University of Helsinki, P.O. Box 55, FI-00014 University of Helsinki, Finland.
authors.forename: Ilkka
authors.initials: I
authors.lastname: Kilpeläinen
authors.affiliation: Laboratory of Organic Chemistry, Department of Chemistry, University of Helsinki, P.O. Box 55, FI-00014 University of Helsinki, Finland. Electronic address: sami.heikkinen@helsinki.fi.
authors.forename: Sami
authors.initials: S
authors.lastname: Heikkinen
keywords: HSQC; Q-HSQC; QEC-HSQC; Quantitative NMR; qNMR