Biodegradable Polymers based on copolymers of polylactic acid (PLA) and polyethylene glycol (PEG) offer scientists new tools for controlled release formulations and delivery platforms.
Polymer structures featuring polyethylene glycol (PEG), with biodegradable or biocompatabile segments offering micelluar, nano and microsphere morphologies which are useful for controlled release formulations. Molecular weights of blocks controlled by GPC. Alternative structures can be synthesized.
A new class of polymeric biomaterials is emerging. The biodegradability of polymers based on lactic acid(LA) and its copolymers with ethylene glycol (EG) opens up new avenues for drug delivery, gene therapy, tissue engineering and determination of cellular pathway mechanisms.
Historically there have been three basic building block monomers for degradable polymers: lactides, glycolides and caprolactone. All are in clinical use and show varying degrees of degradability based on backbone compositions, crystallinity and molecular weights.
Lactic acid is a “chiral” molecule having both (L) and (D) forms with (L) being the common metabolite. The family of lactic acid polymers includes the pure poly-L- lactic acid (L form of PLA), the pure poly-D-lactic acid and the poly-D, L lactic acid (DL-PLA). Many other useful compositions occur when the polymer is organized into diblocks with ethylene glycol and/or glycolic acid comonomers or triblocks with ethylene glycol and/or glycolic acid.
Polymers of this type are insoluble in water but degrade by hydrolytic attack on their ester bonds. This degradation can be mediated by selective choice of comonomers such as ethylene glycol which enhance the penetration of water and rate of hydrolysis.
Additional custom synthesis materials are available upon request. Please contact us for a quotation for your custom synthesis needs.
References:
- (1) D.L. Griffith, Polymeric Biomaterials, Acta Mater. 48, 263-277(2000)
- (2) M. Vert et. al. , Synthesis, Characterization, and Hydrolytic Degradation of PLA/PEO/PLA Triblock Copolymers with Short Poly(L-lactic acid) Chains, Macromolecules, 29, 50-56 (1996)
- (3) D.S. Lee et. al., Poly(D,L-lactic acid-co-glycolic acid)-b-poly(ethylene glycol)-b-poly (D,L-lactic acid-co-glycolic acid) triblock copolymer and thermoreversible phase transition in water, Wiley Periodicals Inc. 2002
- (4) D. Chen et. al. Injectable biodegradable temperature-responsive PLGA—PEG-PLGA copolymers:Synthesis and effect of copolymer composition on the drug release from the copolymer-based hydrogels, International Journal of Pharmaceutics, 294, 103-112 (2005)
- (5) S.W. Kim, Controlled Release of Insulin from Injectable Biodegradable Triblock Copolymer, Pharmaceutical Research, 18, No.. 4, 548-550(2001)
- (6) S.W. Kim, Thermoreversible Gelation of PEG-PLGA-PEG Triblock Copolymer Aqueous Solutions, Macromolecules, 32, 7064-7069 (1999)
polysciences是一家化学品制造公司，产品广泛应用于各个科研领域。公司成立于1961年，起初为电子显微镜提供纳米级样本制备方案，帮助科学家揭示未知领域。随后，开拓了在病理（组织研究）应用产品，使组织除了石蜡包埋外，还能够包埋在塑料块中；开发染料和染色剂，以实现更好的样品观测方式。与政府机构合作，开发了用于诊断试剂盒应的聚合物微球。与美国国家癌症中心合作，开发天然产物分离和纯化产品，并用于紫杉醇的初步临床试验。继而开发出超顺磁珠，用于DNA、蛋白质和肽的研究。Polysciences的高纯度单体和聚合物产品在医疗器械中有许多应用，并不断开发和增强其性能。近期业务扩展到电子产品，Polysciences的精密微粒子产品拓展了纳米技术应用中测量精度。公司秉承为应用而研发，目前已拥有超过3000种产品。PolysciencesInc.致力于提供先进的技术、制造能力和技术支持，帮助客户实现他们的目标。
Polysciences, Inc. 成立于1961年，总部位于宾夕法尼亚州沃灵顿，是一家生产研发化学产品的公司。该公司的产品种类已经累计超过3000种，其产品的特点是体积小，附加值高。 Polysciences产品主要包含： 1、 单体和聚合物 2、 微球和粒子（有机、无机、可生物降解、磁珠、荧光素、染料、特异性抗体和蛋白包被颗粒，直径从40nm到10mm）用于核酸提取、蛋白分离和纯化等。 3、 高性能粘合剂、涂料和密封剂 国际上推出了一些阳离子聚合物基因转染技术，以其适用宿主范围广，操作简便，对细胞毒性小，转染效率高受到研究者们的青睐。其中树枝状聚合物（Dendrimers）和Polysciences聚乙烯亚胺（Polyethylenimine，PEI）的转染性能最佳，但树枝状聚合物的结构不易于进一步改性，且其合成工艺复杂。Polysciences聚乙烯亚胺是一种具有较高的阳离子电荷密度的有机大分子，每相隔二个碳个原子，即每“第三个原子都是质子化的氨基氮原子，使得聚合物网络在任何pH下都能充当有效的“质子海绵”(protonsponge)体。这种聚阳离子能将各种报告基因转入各种种属细胞，其效果好于脂质聚酰胺，经进一步的改性后，其转染性能好于树枝状聚合物，而且它的细胞毒性低。大量实验证明，PEI是非常有希望的基因治疗载体。目前在设计更复杂的基因载体时，PEI经常做为核心组成成分。 转染技术新宠-Polysciences阳离子聚合物基因转染技术 其优点：适用宿主广泛，操作简便，细胞毒性小，转染率高。其中聚乙烯亚胺（PEI）的转染性能最好。聚乙烯亚胺是一种具有较高的阳离子电荷密度的有机大分子，每相隔两个碳原子，就是第三个原子都是质子化的氨基氮原子，使得聚合物网络在任何PH下都能充当有效的“质子海绵”体。这种聚阳离子能将各种报告基因转入各种种属细胞，其效果好于脂质聚酰胺，而且细胞毒性低。大量实验证明，PEI是非常有希望的基因治疗载体。目前在设计更复杂的基因载体时，PEI经常做为核心组成成分。 Polysciences线性聚乙烯亚胺（LinePEI）转染复合物的细胞毒性低，有利于细胞定位，而且转染率极高。 Polysciences公司的两款明星产品线性聚乙烯亚胺（23966-1和24765-1）近年来越来越多的受到研究者们的青睐。其产品被运用到大量的转染实验中，也出现在大量的文献中。
美国POLYSCIENCES公司成立于1961年，主要生产和经营LIFESCIENCES生命科学（胶体金,不含甲醛的甲醇等），病理学和显镜学微球和粒子和磁珠各种单体和聚体等产品。polysciences公司是世界上zui大zui全的多聚化合物供应商,同时是世界*的免疫学,组织化学试剂耗材供应商.
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Author：AndrewJ.Hall,MilenaQuaglia,PanagiotisManesiotis,ErsiliaDeLorenzi,andBörjeSellergren
Resource:AnalyticalChemistry,2006,78(24):8362-8367.
Abstract：
Arangeof2-acrylamidopyridines,showingsubtledifferencesinsolutionbindingtowardcarboxylicacids,hasbeeninvestigatedasfunctionalmonomersinmolecularimprinting.ImprintingofN-Z-L-glutamicacidwithonesuchmonomerisshowntobeeffectiveinthecreationofamolecularlyimprintedpolymer(MIP)withrecognitionpropertiesforitstemplateandalsoforlargermoleculescontainingglutamicacidresidues.IncomparisontoaMIPpreparedviaamore"trADItional"approach,thenewpolymericreceptorsexhibitreducednonspecificbinding.Thenewreceptorsarecomparedwithpreviouslyreportedurea-basedreceptorstargetingtheglutamicacidresidueandreceptorstargetingthepteridinesubstructureoffolicacid.
PMID:17165828
免疫组化多聚物法
immunohistochemistry
英[ɪmjʊnəʊhɪstəʊ'kemɪstrɪ]
美[ɪmjʊnoʊhɪstoʊ'kemɪstrɪ]
[词典]免疫组织化学;
[例句]Methods Transmission electron microscope and immunohistochemistry were used.
方法采用透射电镜和免疫组化法。
苏州高分子科学先进材料有限公司
polymer英[ˈpɒlɪmə(r)]美[ˈpɑ:lɪmə(r)]
n.多聚物; [高分子] 聚合物;
[例句]The nature of the polymer is currently a trade secret.
这一聚合物的性质目前是个商业机密。
[其他]复数：polymers
