More research work on the durability of the
coating under severe washing and abrasion conditions,
and further quantitative analysis (e.g. high-performance
liquid chromatography with mass spectrometry
(HPLC-MS), high-performance liquid chromatography/
electrospray ionization tandem mass spectrometry
(HPLC-ESI/MS)28,29) on the capsaicin content should
be carried out in the future.