< Topic >Can form the gel at the quite small quantity from acidity in the alkaline liquid Characteristic range offer of the gel which possesses the gelatinizer and high environmental living body compatibility and biodegradation Characteristic.SolutionsFormula (1):< Conversion 1 >(In formula,1 R the carbon atom several displays the aliphatic basis of 9 or 23,2 R the hydrogen atom or the carbon atom several the carbon atom which can possess the branching chain of 1 or 2 several displays the alkyl group of 1 or 4,3 R - (CH2)n displays the X basis, n displays the quantity of 1 or 4, X the amino group, the guanidino basis,2 the CONH basis, or the nitrogen atom displays the fused heterocycle which is formed from the five-membered ring or 6 membered-rings or the five-membered ring and 6 membered-rings which 1 or 3 characteristics it can do.)So the gelatinizer which features that it consists of lipid peptide or that pharmacy active salt which is displayed.< Choice figure >Drawing 2【課題】酸性からアルカリ性の液性範囲において極めて少量でゲルを形成できるゲル化剤並びに高い環境・生体適合性及び生分解性を有するゲルの提供。【解決手段】式(1):【化1】(式中、R1は炭素原子数9乃至23の脂肪族基を表し、R2は水素原子、又は炭素原子数1若しくは2の分枝鎖を有し得る炭素原子数1乃至4のアルキル基を表し、R3は-(CH2)n-X基を表し、nは1乃至4の数を表し、Xはアミノ基、グアニジノ基、-CONH2基、又は窒素原子を1乃至3個有し得る5員環若しくは6員環又は5員環と6員環から構成される縮合複素環を表す。)で表される脂質ペプチド又はその薬学的に使用可能な塩からなることを特徴とするゲル化剤。【選択図】図2
