Ring-opening metathesis catalysis has received little attention as a means to functionalize or crosslink biopolymers in water since the required catalysts are not usually stable under these conditions. However, biopolymer solubility suggests such a procedure. We show that Grubbs 1 and 2 generation catalysts (in emulsion) as well as a water-soluble Hoveyda-Grubbs catalyst can be applied to cross...