sulfonated

/S AH0 L F Y AH0 N EY0 T IH0 D/
verb
  1. 1

    To treat or react with a sulfonic acid, or to introduce such a group into a compound.

adjective
  1. 1

    Treated or reacted with a sulfonic acid

  2. 2

    Modified by the addition of a sulfonate group

Source: https://en.wiktionary.org/wiki/sulfonate, https://en.wiktionary.org/wiki/sulfonated