Abstract
Abstract Hansen solubility parameters (HSP) are useful for understanding the solubility and dispersibility of substances in liquids. This study aims at utilizing HSP to describe the affinity between solutes and solid surfaces in solutions. For this purpose, we designed the index “H” based on the HSP theory for predicting the adsorption behavior. In this study, the adsorption index H was used to estimate the desirable solvent compositions for preparing samples for laser desorption/ionization mass spectrometry (LDI-MS). The compositions for obtaining a high-intensity signal of analytes were estimated by selecting an appropriate H value from the relationship between the H and the solubility of the analytes predicted from the HSP. Four different pesticides (analytes) adsorbed on an organosilica film (LDI-MS substrate) were detected with high-intensity signals using the estimated solvent compositions. This study shows that the H is a useful parameter in the design of sample solutions for obtaining high-intensity signals in LDI-MS. Moreover, it is potentially useful for other applications that utilize molecular adsorption on solid surfaces.
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