基于PVA-b-PEO-b-PVA和含苯硼酸PEO交联剂形成的葡萄糖响应性动态共价凝胶
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摘要
设计合成了一类含苯硼酸和氨基结构的聚环氧乙烷(PEO)大分子交联剂,利用其与含聚乙烯醇(PVA)的三嵌段共聚物PVA-b-PEO-b-PVA之间的动态共价作用,构筑得到一类在生理pH下稳定,且对葡萄糖有响应的动态共价凝胶;详细研究了交联剂用量、PVA链段长度对凝胶化过程及凝胶稳定性的影响,证明PVA链段越长、交联剂用量越高,凝胶的稳定性越高,同时这类凝胶的屈服力较高,性质上更接近固体.凝胶在pH=7.4,37℃保持其结构稳定性.进一步发现这类动态共价凝胶具有较强的结构修复能力以及对糖的响应能力,凝胶可包载蛋白质FITC-BSA,加入葡萄糖后,其释放显著加快.
Boronic acid can form dynamic covalent boronic ester bonds with 1,2-diol or 1,3-diol moieties. This property has been used to prepare malleable and self-healing covalent polymer networks as well as glucoseresponsive hydrogels. It remains a challenge to fabricate strong hydrogels with fast glucose-responsivity. Glucoseresponsive dynamic covalent hydrogels were prepared by crosslinking poly(vinyl alcohol)(PVA) containing triblock copolymer and poly(ethylene oxide)(PEO) containing phenylboric acid. Specifically, we synthesized a new type of α,ω-phenylboronic acid substituted PEO crosslinker. The feature of the crosslinker is that aminogroups are introduced to the neighboring position of boronic acid, which will accelerate the boronic ester exchange. The gelation of this crosslinker with three PVA-b-PEO-b-PVA triblock copolymers at physiological pH was examined. Time-dependent dynamic storage and loss modulus of the hydrogels were monitored by rheological measurements. Formation of hydrogels turned out be very fast after mixing the crosslinker and triblock copolymer solutions. Stable dynamic covalent hydrogels were obtained after incubating the hydrogels for 12 h.The copolymer composition, PVA chain length, and content of crosslinker were found to greatly affect the hydrogel properties. Higher polymer concentration, longer PVA chains, and more PEO crosslinker endowed hydrogels with higher modulus. Gels with high yield stress were obtained by utilizing block copolymer with longer PVA segments or adding more crosslinker. Both pH and temperature affected the hydrogel properties. The formed hydrogels displayed higher modulus at pH = 7.4 than those at pH = 6.0, and the stability of the hydrogel could still be maintained at 37℃. In addition, the hydrogels exhibited good structural recovery ability due to the covalent dynamic crosslinking. Finally, the hydrogels could load FITC-BSA, and the release profile of FITC-BSA was accelerated in the presence of glucose.
Boronic acid can form dynamic covalent boronic ester bonds with 1,2-diol or 1,3-diol moieties. This property has been used to prepare malleable and self-healing covalent polymer networks as well as glucoseresponsive hydrogels. It remains a challenge to fabricate strong hydrogels with fast glucose-responsivity. Glucoseresponsive dynamic covalent hydrogels were prepared by crosslinking poly(vinyl alcohol)(PVA) containing triblock copolymer and poly(ethylene oxide)(PEO) containing phenylboric acid. Specifically, we synthesized a new type of α,ω-phenylboronic acid substituted PEO crosslinker. The feature of the crosslinker is that aminogroups are introduced to the neighboring position of boronic acid, which will accelerate the boronic ester exchange. The gelation of this crosslinker with three PVA-b-PEO-b-PVA triblock copolymers at physiological pH was examined. Time-dependent dynamic storage and loss modulus of the hydrogels were monitored by rheological measurements. Formation of hydrogels turned out be very fast after mixing the crosslinker and triblock copolymer solutions. Stable dynamic covalent hydrogels were obtained after incubating the hydrogels for 12 h.The copolymer composition, PVA chain length, and content of crosslinker were found to greatly affect the hydrogel properties. Higher polymer concentration, longer PVA chains, and more PEO crosslinker endowed hydrogels with higher modulus. Gels with high yield stress were obtained by utilizing block copolymer with longer PVA segments or adding more crosslinker. Both pH and temperature affected the hydrogel properties. The formed hydrogels displayed higher modulus at pH = 7.4 than those at pH = 6.0, and the stability of the hydrogel could still be maintained at 37℃. In addition, the hydrogels exhibited good structural recovery ability due to the covalent dynamic crosslinking. Finally, the hydrogels could load FITC-BSA, and the release profile of FITC-BSA was accelerated in the presence of glucose.
引文
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23Carretti E,Grassi S,Cossalter M,Natali I,Caminati G,Weiss R G,Baglioni P,Dei L G.Langmuir,2009,25:8656-8662
24Robb I,Smeulders J T.Polymer,1997,38:2165-2169
25Kitano S,Kataoka K,Koyama Y,Okano T,Sakurai Y.Makromol Chem,Rapid Commun,1991,12:227-233
26Hisamitsu I,Kataoka K,Okano T,Sakurai Y.Pharm Res,1997,14:289-293
27Ivanov A E,Larsson H,Galaev I Y,Mattiasson B.Polymer,2004,45:2495-2505
28Duncan T T,Weiss R G.Colloid Polym Sci,2018,296:1047-1056
29Nurpeissova Z A,Alimkhanova S G,Mangazbayeva R A,Shaikhutdinov Y M,Mun G A,Khutoryanskiy V V.Eur Polym J,2015,69:132-139
30Peters G M,Chi X D,Brockman C,Sessler J L.Chem Commun,2018,54:5407-5409
31Lee J,Ko J H,Mansfield K M,Nauka P C,Bat E,Maynard H D.Macromol Biosci,2018,18:1700372
32Yang T,Ji R,Deng X X,Du F S,Li Z C.Soft Matter,2014,10:2671-2678
33Yang Ting(杨挺),Deng Xinxing(邓鑫星),Du Fusheng(杜福胜),Li Zichen(李子臣).Acta Polymerica Sinica(高分子学报),2014:1553-1560
34Tong Y Y,Dong Y Q,Du F S,Li Z C.J Polym Sci,Part A:Polym Chem,2009,47:1901-1910
35Li J,Loh S.Adv Drug Delivery Rev,2008,60:1000-1017
36Liu F Y,Li F Y,Deng G H,Chen Y M,Zhang B Q,Zhang J,Liu C Y.Macromolecules,2010,45:1636-1645
37Roberts M C,Hanson M C,Massey A P,Karren E A,Kiser P F.Adv Mater,2007,19:2503-2507
2Ferreira N N,Ferreira L M B,Cardoso V M O,Boni F I,Souza A L R,Gremiao M P D.Eur Polym J,2018,99:117-133
3Li J Y,Mooney D J.Nat Rev Mater,2016,1:16701
4Amaral A J R,Pasparakis G.Polym Chem,2017,8:6464-6484
5Wang H Y,Heilshorn S C.Adv Mater,2015,27:3717-3736
6Brooks W L A,Sumerlin B S.Chem Rev,2016,116:1375-1397
7Elshaarani T,Yu H J,Wang L,Zain A,Ullah R S,Haroon M,Khan R U,Fahad S,Khan A,Nazir A,Usman M,Naveed K U R.J Mater Chem B,2018,6:3831-3854
8Yesilyurt V,Webber M J,Appel E A,Godwin C,Langer R,Anderson D G.Adv Mater,2016,28:86-91
9Guo R W,Su Q,Zhang J W,Dong A J,Lin C G,Zhang J H.Biomacromolecules,2017,18:1356-1364
10Bao C Y,Jiang Y J,Zhang HY,Lu X Y,Sun J Q.Adv Funct Mater,2018,28:1800560
11Zhang M,Song C C,Du F S,Li Z C.ACS Appl Mater Interfaces,2017,9:25905-25914
12Tang S C,Ma H,Tu H C,Wang H R,Lin P C,Anseth K S.Adv Sci,2018,5:1800638
13Huang Z J,Delparastan P,Burch P,Cheng J,Cao Y,Messersmith P B.Biomater Sci,2018,6:2487-2495
14Mukherjee S,Hill M R,Sumerlin B S.Soft Matter,2015,11:6152-6161
15Kataoka K,Miyazaki H,Bunya M,Okano T,Sakurai,Y.J Am Chem Soc,1998,120:12694-12695
16Zhang Y,Guan Y,Zhou S.Biomacromolecules,2007,8:3842-3847
17Lapeyre V,Gosse I,Chevreux S,Ravaine V.Biomacromolecules,2006,7:3356-3363
18Hoare T,Pelton R.Biomacromolecules,2008,9:733-740
19Wu W,Mitra N,Yan E C Y,Zhou S.ACS Nano,2010,4:4831-4839
20Hassan C,Peppas N.Adv Polym Sci,2000,153:37-65
21Lorand J P,Edwards J O.J Org Chem,1959,24:769-774
22Brooks W L A,Deng C C,Sumerlin B S.ACS Omega,2018,3:17863-17870
23Carretti E,Grassi S,Cossalter M,Natali I,Caminati G,Weiss R G,Baglioni P,Dei L G.Langmuir,2009,25:8656-8662
24Robb I,Smeulders J T.Polymer,1997,38:2165-2169
25Kitano S,Kataoka K,Koyama Y,Okano T,Sakurai Y.Makromol Chem,Rapid Commun,1991,12:227-233
26Hisamitsu I,Kataoka K,Okano T,Sakurai Y.Pharm Res,1997,14:289-293
27Ivanov A E,Larsson H,Galaev I Y,Mattiasson B.Polymer,2004,45:2495-2505
28Duncan T T,Weiss R G.Colloid Polym Sci,2018,296:1047-1056
29Nurpeissova Z A,Alimkhanova S G,Mangazbayeva R A,Shaikhutdinov Y M,Mun G A,Khutoryanskiy V V.Eur Polym J,2015,69:132-139
30Peters G M,Chi X D,Brockman C,Sessler J L.Chem Commun,2018,54:5407-5409
31Lee J,Ko J H,Mansfield K M,Nauka P C,Bat E,Maynard H D.Macromol Biosci,2018,18:1700372
32Yang T,Ji R,Deng X X,Du F S,Li Z C.Soft Matter,2014,10:2671-2678
33Yang Ting(杨挺),Deng Xinxing(邓鑫星),Du Fusheng(杜福胜),Li Zichen(李子臣).Acta Polymerica Sinica(高分子学报),2014:1553-1560
34Tong Y Y,Dong Y Q,Du F S,Li Z C.J Polym Sci,Part A:Polym Chem,2009,47:1901-1910
35Li J,Loh S.Adv Drug Delivery Rev,2008,60:1000-1017
36Liu F Y,Li F Y,Deng G H,Chen Y M,Zhang B Q,Zhang J,Liu C Y.Macromolecules,2010,45:1636-1645
37Roberts M C,Hanson M C,Massey A P,Karren E A,Kiser P F.Adv Mater,2007,19:2503-2507
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