FIG 1.

Electrokinetic potential analysis of wool and nylon via SurPASS titration. One gram of each fiber, wool and nylon, was packed into a cylindrical cell to estimate the electrokinetic potential of each fiber. Hydrochloric acid (□) titrations for nylon were followed by a NaOH (◇) titration. Similarly, HCl (△) titrations for wool were followed by a NaOH (×) titration. Parameters were set to assess electrokinetic potential between pH 2 and 9. Error bars represent the indicated standard deviations among 12 replicates from three independent experiments. FM, Fairbrother-Mastin.