Problem to be solved: to provide an denatured polysaccharide which is preferably used as a component of a composition such as bone cement, which is excellent in adhesive property even in a non dry state (for example, in the presence of water).Solution: denatured polysaccharide introduced into polysaccharide, phosphate group (A1) and radical reactive group (A2).No selection【課題】非乾燥状態(例えば水分存在下)であっても接着性に優れた、骨用セメント等の組成物の含有成分として好ましく用いられる変性多糖を提供する。【解決手段】多糖に、リン酸基(a1)およびラジカル反応性基(a2)が導入された変性多糖。【選択図】なし