Evaporation of volatile guest compounds incorporated into solid-state cyclodextrins

The evaporation of volatile naphthalene compounds incorporated into solid-state cyclodextrins (CDs) was quantitatively evaluated using a solid-phase extraction (SPE) device and high-performance liquid chromatography (HPLC). Initially, an aqueous CD solution was spiked on a quartz filter and dried. Then, solution of naphthalene compounds in acetone was spiked on the filter, resulting in the formation of guest-CD complexes on the filter. The filter was fixed in a filter holder, and the SPE device was connected to the filter holder. Subsequently, clean air was collected via the filter holder and the SPE device using a gas sampling pump. During air sampling, naphthalene compounds evaporated from the filter and were collected on the SPE device. Subsequently, naphthalene compounds in the SPE device and the filter were eluted with acetone, followed by quantification with HPLC. The results indicated that the inclusion in solid-state β-CD suppressed the evaporation of naphthalene compounds. In addition, the inclusion effect was stronger for the dry than for the wet CDs. The inclusion effect was also found to increase with temperature.