pH titrations. Polymers were freshly dissolved in 5 mL of PicoPure water prior to titration. Polymer solutions were first titrated to pH~11.5 using 1 M NaOH. Five microliter aliquots of 1 M HCl were added to polymer solutions and the pH was recorded.
Waite et al. BMC Biotechnology 2009 9:38 doi:10.1186/1472-6750-9-38