Dyes in mouthwash: separation and concentration using fiber optic dip probe and OceanOptics CCD detection.   Adam L. Silbernagel, Jonathan M. Kavanaugh.  2007.

 

Mouthwash was analyzed by completing a solid phase extraction (SPE) of individual dyes from three different brands; Swish, Kroger and Listerine. Yellow #5, Blue #1, and Red #33  were dyes from three different brands; Swich, Kroger and Listerine. Yellow #5, Blue #1 and Red #33 were the dyes present in these mouthwashes. After SPE was performed on all the mouthwashes, concentrations of the dyes were determined. Using these concentrations, the molarity per bottle and grams per rinse were found for each dye which are reported later in this report. However, since correct standards were not available for Blue #1 and Red #33, the concentrations are marginally different than what was determined. Beer’s law and the use of Red #40 were used to estimate their concentrations. In Swish, the concentrations of Blue #1 and Red #33 were 6.21E-09 M and 2.66E-06 M. In Kroger, the concentrations of Blue #1 and Yellow #5 were 3.95E-07 M and 7.37E-07 M.