J. du Plessis

Stable isotope dilution analysis of salicylic acid and hydroquinone in human skin samples by gas chromatography with mass spectrometric detection.

A. Judefeind, P. V. van Rensburg, S. Langelaar, 2007, Journal of chromatography. B, Analytical technologies in the biomedical and life sciences.

Quantitative determination of octadecenedioic acid in human skin and transdermal perfusates by gas chromatography-mass spectrometry.

P. J. Jansen van Rensburg, J. Wiechers, A. Judefeind, 2008, Journal of chromatographic science.

A fast and simple method for the determination of clavulanic acid in human plasma using derivatisation reaction kinetics.

H. Hundt, K. Swart, A. Hundt, 2000, Journal of pharmaceutical and biomedical analysis.

A new scanning electron microscope (SEM) method for the determination of particle size in parenteral fat emulsions.

J. du Plessis, V. Hamilton-Attwell, C. J. van Wyk, 1987, Journal of microscopy.