CONFLICT OF INTEREST The authors have no potential conflicts of interest to disclose. Supporting Information Filename Description pi70129-sup-0001-TableS1.docxWord 2007 document , 54.6 KB Table S1. The pH of PECs with different ratios of COS and FUC at both 1 and 3 mg mL−1 concentrations. REFERENCES 1, , and , Nat Mater 4: 729–740 (2005). 2, and , Curr Opin Colloid Interface Sci 12: 166–178 (2007). 3, , and , Curr Opin Colloid Interface Sci 10: 52–78 (2005). 4, Anal Sci 27: 695–702 (2011).