JP5750798B2 - 糖由来の低分子ヒドロゲル化剤、および前記ヒドロゲル化剤を有効成分とするヒドロゲル - Google Patents
糖由来の低分子ヒドロゲル化剤、および前記ヒドロゲル化剤を有効成分とするヒドロゲル Download PDFInfo
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Description
これに対して優れた生分解性、生体適合性を期待できる低分子ヒドロゲル化剤が近年研究されている。また低分子ヒドロゲル化剤は1wt%以下の低濃度でゲル化するものも多い。しかしながら、これまでに報告されている低分子化合物は合成が煩雑であり、実用化に向けてはコスト面で問題があった(特許文献1)。一方、低分子ヒドロゲル化剤の例として、フェニル-β-グルコピラノシド誘導体は、比較的安価な原料から簡便に合成することができる。さらに、この化合物は水−親水性有機溶媒の混合液をゲル化することが報告されている(特許文献2)。
本発明は、このような従来技術の有する課題を鑑みてなされたものであり、フェニル-β-グルコピラノシド誘導体の分子構造を見直し、分子の親水性を向上させることにより、水−親水性有機溶媒の混合液だけでなく、水だけでもゲル化機能を示す安価な新規低分子ヒドロゲル化剤を提供することを目的とするものである。
(1)下記一般式(I)(式中、Aは糖の残基を表し、R1及びR2は独立して水素、メチル、ヒドロキシ、メトキシ、フッ素、クロル、ブロム、またはヨウ素を表し、-C(O)-Rはヒドロキシ脂肪酸から誘導されるアシル基を表す)で表される低分子ヒドロゲル化剤。
(3)Aが、アルドピラノースの6員環に結合するいずれか一つの水酸基を除いた残基を表す前記(1)または(2)に記載の低分子ヒドロゲル化剤。
(4)前記Aが、β-D-グルコピラノース残基である前記(3)に記載の低分子ヒドロゲル化剤。
(5)ヒドロキシ脂肪酸の炭素数が6−20である前記(1)〜(4)のいずれか一項に記載の低分子ヒドロゲル化剤。
(6)前記(1)〜(5)のいずれかに記載のヒドロゲル化剤によって、水または親水性有機溶媒を含む水がゲル化されたことを特徴とするヒドロゲル。
(7)下記一般式(I)
(実施例1)低分子ヒドロゲル化剤化合物の合成
親水部としての単糖がβ-D-グルコピラノース、疎水部としてRが炭素数13のヒドロキシ脂肪酸を有する低分子ヒドロゲル化剤化合物(化合物1)を下記の反応式にしたがって合成した。なお、4-アミノフェニル-β-D-グルコピラノシドは、特開2003−49154号公報に記載の方法で合成した。
アルゴン雰囲気下、4-アミノフェニル-β-D-グルコピラノシド 0.29 g (1.10 mmol), 3-ヒドロキシミリスチン酸 0.26g (1.10 mmol) (東京化成工業(株)製), 1-エチル-3-(3-ジメチルアミノプロピル)カルボジイミド塩酸塩(WSC・HClと略記する) 1.01 g (5.28 mmol) (国産化学(株)製)を無水テトラヒドロフラン 50 mL に溶解させ、室温で8時間攪拌した。有機溶媒を減圧留去後、粗生成物を得た。得られた粗生成物を、シリカゲルクロマトグラフィー(メタノール)で精製し、乾燥させて白色固体の目的物0.29gを得た(収率54%)。
1H NMR (CD3OD) :・0.99 (t, 3H, J = 7.08 Hz) ; 1.38 (m, 18H) ; 1.60 (m, 2H) ; 2.55 (m, 2H) ; 3.40-4.14 (m, 8H) ; 7.15 (d, 2H, J = 9.0 Hz) ; 7.55 (d, 2H, J = 9.0 Hz). +ESI-LC-MS m/z = 497+23(M+Na).
4-アミノフェニル-β-D-グルコピラノシドとミリストイルクロリドから、特開2003−49154号公報の合成と同等の方法を用いて化合物2を合成した(収率66.5%)。
1H NMR (DMSO-d6) :・0.98 (t, 3H) ; 1.48 (m, 20H) ; 1.83 (m, 2H) ; 2.49 (t, 2H, J
= 7.4 Hz,) ; 3.28-3.99 (m, 7H) ; 7.15 (d, 2H, J = 8.6 Hz) ; 7.54 (d, 2H, J = 8.6 Hz). +ESI-LC-MS m/z = 481+23(M+Na).
実施例1で得られた低分子ヒドロゲル化剤化合物のヒドロゲル化能を以下のように評価した。
実施例1で作成した低分子ヒドロゲル化剤の濃度を0.1−1.0wt%となるように、純水あるいは水-アルコールの混合液に混合し、この混合物を固形成分が溶解するまで加熱する。生成した溶液を室温まで冷却後、放置した。ヒドロゲルの形成は、得られたサンプルを倒立させた際に、ゲルが流れ落ちないことを基準とした。
また、化合物1と純水から得られた(1wt%)ヒドロゲルを凍結乾燥して作成したキセロゲルの電界放出型走査電子顕微鏡(FE-SEM)観察を行ったところ、繊維状構造体からなる網目構造が観察された(図2)。すなわち、化合物1が純水中で溶解した後、繊維状に自己集合し、この繊維の網目の中に溶媒分子が取り込まれることで、ヒドロゲルが形成した。
Claims (6)
- 下記一般式(I):
- 前記Aが、アルドピラノースの6員環に結合するいずれか一つの水酸基を除いた残基を表す請求項1に記載の低分子ヒドロゲル化剤。
- 前記Aが、β-D-グルコピラノース残基である請求項2に記載の低分子ヒドロゲル化剤。
- ヒドロキシ脂肪酸が3−ヒドロキシミリスチン酸である請求項1〜3のいずれか一項に記載の低分子ヒドロゲル化剤。
- 請求項1〜4のいずれかに記載のヒドロゲル化剤によって、水又は親水性有機溶媒を含む水がゲル化されていることを特徴とするヒドロゲル。
- 下記一般式(I)
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