A Novel Approach to Internal Standardization in LC/MS/MS Analysis; Sensitive LC/MS/MS Analysis of Gentamicin

Bruce Babson, Noel Henderson and Nicholas Chestara, MicroConstants, Inc., 9050 Camino Santa Fe, San Diego, CA 92121

Date Posted: Friday, May 28, 2010

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A novel approach to internal standardization in LC/MS/MS is demonstrated. Gentamicin, a multi-component aminoglycoside, is derivatized with propyl-d7 chloroformate making the internal standard. Gentamicin components in the samples are derivatized with non-labeled propyl chloroformate making them analogous to the internal standard. Additional benefits of the derivatization are increased hydrophobicity and excellent MS/MS fragmentation allowing for a sensitive LLOQ of 2 ng/mL total Gentamicin using only 50 uL of plasma.

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