Gentamycin in plasma is extracted with a cation exchange solid-phase extraction column (carboxy-

propyl-bonded silica column). Gentamycin is eluted with a 1 : 1 mixture of acetonitrile-0.2 mol L_1 borate buffer (pH 10.5) and is derivatized with 9-fluorenylmethyl chloroformate. Derivatized gen-tamycin is analysed on an ODS column with a mobile phase consisting of acetonitrile-water (9 : 1). The derivatives are detected fluorometrically at 260 nm excitation, 315 nm emission, with a detection limit of less than 50ngmL~\ Gentamycins C1; C1a and C2 are resolved (Figure 1, structures 2, 3 and 4, respectively).

o-Phthaldialdehyde, dansyl chloride, fluorescamine, 1-fluoro-2,4-dinitrobenzene or 2,4,6-trinitroben-zenesulfonic acid may also be used as derivatizing reagents.

Solar Panel Basics

Solar Panel Basics

Global warming is a huge problem which will significantly affect every country in the world. Many people all over the world are trying to do whatever they can to help combat the effects of global warming. One of the ways that people can fight global warming is to reduce their dependence on non-renewable energy sources like oil and petroleum based products.

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