While maintaining a certain strength, swelling property is low, the optical building a bridge polysaccharide which is new in vivo disassembly characteristic is high is offered. It is obtained with the building a bridge reaction of the optical reactivity polysaccharide which introduces the optical reactivity basis into the polysaccharide is low to (i) and (ii) below swelling quality and the blue dextran of statement low the polysaccharide pseudo sponge which possesses dyeing quality.weight % Of (i) solvent content ratio 96 specimen (thickness: 1mm and length: 10mm and side: 10mm) it produces, the particular specimen in the injection service water, at room temperature after 1 hours soaking, below measuring, the swelling ratio which is displayed with formula is 125% or less.(As for S1 the area before the soaking, as for S2 the area after the soaking is displayed. Furthermore, the area is calculated from length of length and side of the specimen.)weight % Of (ii) solvent content ratio 96 specimen (thickness: 1mm and length: 20mm and side: The absorbency in the wave length 620nm where 10mm) it produced, after soaking in the 0.5g/mL aqueous solution of the blue dextran of weight average molecular weight 2 million, it washed the particular specimen, adding water disassembled the specimen, 0.67 weight % manufactured the aqueous solution as a polysaccharide density, it measured concerning the particular aqueous solution is 0.15 or less.ある程度の強度を保ちつつ、膨潤性が低く、生体内分解性が高い新規な光架橋多糖を提供する。多糖に光反応性基を導入した光反応性多糖の架橋反応で得られ、以下の(I)及び(II)に記載の低膨潤特性およびブルーデキストラン低染色特性を有する多糖擬スポンジ。(I)溶媒含有率96重量%の試験片(厚さ:1mm,縦:10mm,横:10mm)を作製し、当該試験片を注射用水に、室温にて1時間浸漬した後に測定した以下の式で表される膨潤率が125%以下である。(S1は浸漬前の面積、S2は浸漬後の面積を表す。なお、面積は試験片の縦と横の長さより算出される。)(II)溶媒含有率96重量%の試験片(厚さ:1mm,縦:20mm,横:10mm)を作製し、当該試験片を重量平均分子量200万のブルーデキストランの0.5g/mL水溶液に浸漬した後、水洗し、試験片を加水分解し、多糖濃度として0.67重量%の水溶液を調製し、当該水溶液について測定した波長620nmにおける吸光度が0.15以下である。
