Journal
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
Volume 390, Issue 7, Pages 1843-1852Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00216-008-1889-z
Keywords
bioanalytical methods; biological samples; mass spectrometry
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The insulin-like-growth factor (IGF-I) peptide is considered to be the main indirect marker for growth hormone administration (GH) in a horse. Further to a previous investigation on measurement of IGF-I in plasma samples by mass spectrometry, this study focuses on quantitative and qualitative analysis of intact IGF-I in horse plasma. First, protein-transposing software has been developed for IGF-I to facilitate its quantification by HPLC-electrospray-ion-trap mass spectrometry. Second, product-ion scan experiments on IGF-I have been conducted on standard samples, non-fortified equine plasma samples, fortified plasma samples, and equine GH post-administration samples. This top-down approach method enables characterisation of fragment ions corresponding to the carboxy terminal end, which can be useful for the confirmation of the presence of IGF-I in plasma samples.
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