JP7360670B2 - キトサン及びセルロースナノファイバーを含む水性ゲル複合体 - Google Patents
キトサン及びセルロースナノファイバーを含む水性ゲル複合体 Download PDFInfo
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Classifications
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- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Medicinal Chemistry (AREA)
- Veterinary Medicine (AREA)
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- Dermatology (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Transplantation (AREA)
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- Life Sciences & Earth Sciences (AREA)
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- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Polymers & Plastics (AREA)
- Materials For Medical Uses (AREA)
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- Polysaccharides And Polysaccharide Derivatives (AREA)
Description
(1) 水性ゲル複合体の形成に適用できる懸濁液であって、溶媒としての水(水性懸濁液)または水とアルコールの混合物(水性アルコール懸濁液)、該溶媒に分散されたセルロースナノファイバー、キトサン及び酸を含む、懸濁液。
(2) 該分散されたセルロースナノファイバーの含量は、該懸濁液の総重量に対して5 重量%以下、好ましくは0.01~2 重量%、より好ましくは0.02~0.6 重量%であり;該キトサンの濃度は、該懸濁液の総重量に対して15 重量%以下、好ましくは1~5 重量%、より好ましくは2~4 重量%である、(1)項に記載の懸濁液。
(3) 該キトサンの分子量(Mw)は400~800 kg/molである、(1)項または(2)項に記載の懸濁液。
(4) pHは6.5未満、好ましくは3~5である、(1)項~(3)項のいずれかに記載の懸濁液。
(5) 該懸濁液は、溶媒として水/プロパンジオール混合物を含む水性アルコール懸濁液である、(1)項~(4)項のいずれかに記載の懸濁液。
(6) 組織を再生する方法に用いるための(1)項~(5)項のいずれかに記載の懸濁液。
(7) 該組織は、天然な軟骨、半月板、または腱、真皮、線維輪組織から選択される他の結合組織である、(6)項に記載の使用のための懸濁液。
(8) 該懸濁液が、骨軟骨の欠損部、半月板/軟骨の病変部、または他の結合組織の病変部に注入され、組織の再生を促進する、(6)項または(7)項に記載の使用のための懸濁液。
(9) (1)項~(5)項のいずれかに記載の懸濁液のゲル化により得られる水性ゲル複合体。
(10) 該懸濁液を中和してゲル化を行う、(9)項に記載の水性ゲル複合体。
(11) 該懸濁液にNaOHまたはNH3を加えてゲル化を行う、(9)または(10)項に記載の水性ゲル複合体。
(12) 該水性ゲル複合体の平衡貯蔵係数G'は2600 Pa以上である、(9)項~(11)項のいずれかに記載の水性ゲル複合体。
(13) 該水性ゲル複合体の基準極限縫合力(水性ゲルパッチの厚さに基づいた基準極限縫合力)は0.03 N.mm-1以上である、(9)項~(12)項のいずれかに記載の水性ゲル複合体。
(14) 生体吸収性及び生体適合性のある移植片の製造における、(9)項~(13)項のいずれかに記載の水性ゲル複合体の使用。
(15) 該生体吸収性及び生体適合性のある移植片は、編み織物の移植片である、(14)項に記載の使用。
A) 水性経路から得られた懸濁液及び水性ゲル:
参考(Fumagali, M, Ouhab, D., Molina Boisseau S., Heux L, Versatile gas-phase reactions for surface to bulk esterification of cellulose microfibrils aerogels, Biomacromolecules 14, 21013, pp3246-3255)に従い、水性スラリー形のセルロースナノファイバー市販品(濃度0.4 重量%)を、2 重量%の濃度で水に分散されたキトサン粉末(Mw =約600 kg/mol、DA=3%)と混合した。該混合物を超音波処理(超音波ホモジナイザーSonoPlus HD200-Bandelin、ドイツ、45%振幅で5分間)した。次に、該混合物を1時間機械攪拌した。そして、キトサンのアミン基に対する化学量論的濃度で酢酸を加え(n(酢酸)/n(-NH2)=1 mol/mol;ここで、n(酢酸)は酢酸のモル数であり、n(-NH2)はグルコサミン単位のモル数である)、pHを約4.5にした。該混合物を密閉の反応器の中で5時間機械攪拌し、キトサンを完全に溶解させた。
参考(Fumagali, M, Ouhab, D., Molina Boisseau S., Heux L, Versatile gas-phase reactions for surface to bulk esterification of cellulose microfibrils aerogels, Biomacromolecules 14, 21013, pp3246-3255)に従い、水性スラリー形のセルロースナノファイバー市販品(濃度0.8 重量%)を、4 重量%の濃度で水に分散されたキトサン粉末(Mw =約600 kg/mol、DA=3%)と混合した。該混合物を超音波処理(超音波ホモジナイザーSonoPlus HD200-Bandelin、ドイツ、45%振幅で5分間)した。次に、該混合物を1時間機械攪拌した。そして、キトサンのアミン基に対する化学量論的濃度で酢酸を加え(n(酢酸)/n(-NH2)=1 mol/mol;ここで、n(酢酸)は酢酸のモル数であり、n(-NH2)はグルコサミン単位のモル数である)、pHを約4.5にした。該混合物を密閉の反応器の中で5時間機械攪拌し、キトサンを完全に溶解させた。その後、該水性懸濁液の重量に等しい重量の1,2-プロパンジオールを加えた。従って、キトサンの最終濃度は3 重量%であり、セルロースナノファイバーの含量は0.45 重量%であった。
本実施例において、異なる含量で分散されたセルロースファイバー(CNF)及びキトサン(CHI)を含む水性または水性アルコール懸濁液をゲル化して得られた水性ゲル複合体について、50 Nのロードセルを備えた自家製のマイクロ引張試験機を用いて引張機械試験を行った。クロスヘッド速度は1 μm/秒(図1a)、1b))または8 μm/秒(図1c)であった。該実験は、湿度制御が可能なチャンバーの中で行われた(相対湿度(RH):23~95%)。その結果を図1a)、1b)及び1c)に示す。
プレート-プレート幾何学(直径25 mm)に基づくARESレオメーター(TA Instruments社)を用いて動的機械的な流体力学測定を室温で行った。該測定が線形粘弾性の領域内(負荷された最大ひずみの値は5×10-3)で行われるよう、ひずみ振幅を観測し、ひずみ振幅とは無関係に、貯蔵係数(G')及び損失係数(G")を得た。該2つのプレート間のギャップ距離は約1.0 mmであった。次に、角周波数掃引測定を100~0.05 rad s-1範囲で行った。各水性ゲルについて該分析を3回繰り返して行った。貯蔵係数と損失係数を研究するため、分散されたセルロースファイバー(CNF)及びキトサン(CHI)を異なる含量で含む水性または水性アルコール懸濁液のゲル化から得られたCHI/CNF水性ゲル複合体の特性評価を行った。
Flamingoらの方法(Biomacromolecules 2016, 17, 1662-1672)に従って縫合糸の引き裂きにおける抵抗試験により、実施例1に概説されたように調製され、分散されたセルロースファイバー(CNF)及びキトサン(CHI)を異なる含量で含み、水性または水性アルコール性懸濁液のゲル化から得られた水性ゲル複合体の縫合性を評価した。該方法では、縫合糸(Ethicon PDS II 4-0(1,5 Ph.Eur.))を用いて該水性ゲルの中で緩い縫合を行い、該水性ゲルが破損するまでに該縫合に加える力を徐々に増やしていく。水/1,2-プロパンジオール(水性アルコール経路)または水のみ(水性経路)を用いて、また、異なる含量のセルロースナノファイバー(CNF)を用いる2つの異なる処理方法で得られた水性ゲル複合体の極限縫合荷重への影響を調べた。
椎間板の生体力を再構築するために、3 重量%のキトサン及び0.4 重量%のセルロースナノファイバーを含み、水性アルコール経路で得られた懸濁液に由来の水性ゲルを線維輪に欠損のある椎間板の中に移植した。
Claims (17)
- 水性ゲル複合体を形成するための懸濁液であって、溶媒としての水(水性懸濁液)または水とアルコールの混合物(水性アルコール懸濁液)、該溶媒に分散されたセルロースナノファイバー、キトサン及び酸を含み、ここで、該セルロースナノファイバーがTEMPOにより酸化されたセルロースナノファイバーではない、懸濁液。
- 該分散されたセルロースナノファイバーの含量は、該懸濁液の総重量に対して5重量%以下であり;該キトサンの濃度は、該懸濁液の総重量に対して15重量%以下である、請求項1に記載の懸濁液。
- 該分散されたセルロースナノファイバーの含量は、該懸濁液の総重量に対して0.01~2重量%であり;該キトサンの濃度は、該懸濁液の総重量に対して1~5重量%である、請求項1に記載の懸濁液。
- 該分散されたセルロースナノファイバーの含量は、該懸濁液の総重量に対して0.02~0.6重量%であり;該キトサンの濃度は、該懸濁液の総重量に対して2~4重量%である、請求項1に記載の懸濁液。
- 該キトサンの分子量(Mw)は400~800 kg/molである、請求項1~4のいずれか1項に記載の懸濁液。
- pHは6.5未満である、請求項1~5のいずれか1項に記載の懸濁液。
- pHは3~5である、請求項1~5のいずれか1項に記載の懸濁液。
- 該懸濁液は、溶媒として水/プロパンジオール混合物または水/グリセロール混合物を含む水性アルコール懸濁液である、請求項1~7のいずれか1項に記載の懸濁液。
- 組織再生方法に使用するための請求項1~8のいずれか1項に記載の懸濁液であって、該組織は、天然な軟骨、半月板、または、腱、真皮、および線維輪組織から選択される結合組織である、懸濁液。
- 該懸濁液が、骨軟骨の欠損部、半月板/軟骨の病変部、または、腱、真皮、および線維輪組織から選択される結合組織の病変部に注入され、組織の再生を促進する、請求項9に記載の懸濁液。
- 請求項1~8のいずれか1項に記載の懸濁液のゲル化により得られる水性ゲル複合体。
- 該懸濁液を中和してゲル化を行う、請求項11に記載の水性ゲル複合体。
- 該懸濁液にNaOHまたはNH3を加えてゲル化を行う、請求項11または12に記載の水性ゲル複合体。
- 該水性ゲル複合体の平衡貯蔵係数G'は2600 Pa以上である、請求項11~13のいずれか1項に記載の水性ゲル複合体。
- 該水性ゲル複合体の基準極限縫合力(水性ゲルパッチの厚さに基づいた基準極限縫合力)は0.03 N.mm-1以上である、請求項11~14のいずれか1項に記載の水性ゲル複合体。
- 生体吸収性及び生体適合性のある移植片の製造における、請求項11~15のいずれか1項に記載の水性ゲル複合体の使用。
- 該生体吸収性及び生体適合性のある移植片は、編み織物の移植片である、請求項16に記載の使用。
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