Crosslinkers containing aliphatic hydrocarbon chains of various lengths were introduced into solubilized collagen with lime (SCL) in order to stabilize its structure. The crosslinking resulted in an increase in the denaturation temperature and helix regeneration ratio of the modified SCL. The increase was prominent when a large fraction of the amino groups on the SCL side chains was modified with a crosslinker containing five or more methylene groups that can encompass more than one collagen helix pitch. These results suggest that the length of a crosslinker is important for the stabilization of the triple-helical structure of the SCL.