State-of-the-Art Gas Chromatography: Instrumental Design

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Abstract
Some applications of heart-cutting on a variety of samples are described, employing a heated micro-volume mechanical valve installed in an instrument with independently programmable dual ovens. A polarity test mixture containing a wide range of functional groups indicates that the valve does not contribute catalytic or sorptive activity when used under these conditions. Applications include (A) analysis of a commercial gasoline, demonstrating increased overall separation and the isolation of specific additives; (B) isolation of specific key compounds and low levels of antioxidant chemicals from a commercial lemon oil; and (C) isolation of specific solutes from a urine extract prepared for drug scanning.