• The column packing gel has pores of different sizes, and when component molecules of different sizes enter the gel with the mobile phase, the smaller the molecules are the deeper they enter the micropores and the longer they are retained in the gel, so they can be eluted in order of molecular size. (antiteck.com)
  • Creams or gels that contain smaller amounts of capsaicin (less than 0.075%) don't seem to work. (medlineplus.gov)