A gelatinizer is provided having a component which promises to have
biological compatibility, which can easily be mass-produced by a simple
method, and which can solidify a large amount of water or aqueous
solution when only a very small weight of it is used.This invention is a
hydrogelatinizer represented by the general formula: R-A.sub.n where A,
which may be identical or different, are respectively nucleotides, n is 2
or 3, and R is a hydrocarbon chain (when n is 2, R is bivalent, and when
n is 3, R is trivalent), said hydrocarbon being bonded to a phosphoric
acid part of said nucleotides.