如今，生物感測器隨著醫療、病原體檢測、環境監測、食品安全檢測等廣泛應用而變得越來越重要。然而，這些樣品的成分相當複雜，會產生嚴重的背景信號導致，生物感測器受到影響。同時，在“非特異性吸附”造成降低靈敏度和特異性造成嚴重的問題。因此，通過低聚物氮矽三環(Oligomeric silatrans)對生物感測器進行表面修飾是改善這些問題的常用方法。巰基氮矽三環 (MPS) 是一種包含三環籠狀結構和跨環 N→Si 配鍵的化合物，提供可被控制的矽烷化並得到更均勻的薄膜。在本研究中，2-甲基丙烯醯氧基乙基磷醯膽鹼（MPC）或羧化聚乙二醇甲基丙烯酸酯（Carboxylated-PEGMA）將通過硫醇-烯加成反應與MPS進行化學鍵結，形成兩種低聚物氮矽三環MPS-MPCn和MPS-Carboxylated PEGMAm其具有各自獨立的功能。除此之外，MPC為雙離子材料，具有優異的抗汙性和良好的生物相容性。因此，在MPS-MPC2.5修飾後進行抗汙測試表現出優異的細菌粘附和蛋白質吸附的抵抗力。此外，低聚物 MPS-Carboxylated PEGMA2.5 作為大分子包含大量的羧基，通過共價鍵轉化為可功能化的中間體使其具有生物選擇性的表面。在生物檢測研究中，通過將 70% MPS-Carboxylated PEGMA2.5 和 30% MPS-MPC2.5 按濃度比例混合進行表面修飾，可以顯著減少非特異性吸附，並通過酵素結合免疫吸附試驗(ELISA)形成傳感表面。在大範圍的濃度測試中，混合的自組裝塗層表面在 25 ?g/mL 至 1000 ?g/mL 的多種抗原濃度範圍內展現出牛血清白蛋白(BSA)濃度與檢測信號之間的非線性關係，同時表現出與表面活性位點相連的生物受體從 5.5 ?g/mL 到 27.5 ?g/mL 的 HRP 偶聯二級抗體檢測的線性關係。因此，混合低聚物氮矽三環單一塗層是一種潛在的生物感測器表面改質 方法，因其優秀的抗汙性能，可通過稀釋表面分子密度來提高目標檢測能力;Nowadays, biosensor becomes more and more important along with a wide range of applications, including medical, pathogen discovery, environmental monitoring, food quality testing, etc. However, the components of these samples are quite complex and generate a serious background signal at the interface of biosensors. In addition, reducing sensitivity and specificity through non-specific adsorption of the biosensor are also a serious issue. Therefore, surface modification for biosensors via oligomeric silatranes has been developed to address these problems. Mercaptopropylsilatrane (MPS) is one type of silatranes containing the tricyclic caged structure and transannular N→Si dative bond that enables control silanization and provides thin homogeneous films. In this study, 2-methacryloyloxyethyl phosphorylcholine (MPC) and carboxylated poly(ethylene glycol) methacrylate (Carboxylated-PEGMA) can chemically linked with MPS through thiol-ene polymerization to form two kinds of copolymer MPS-MPCn and MPS-Carboxylated PEGMAm with independent functions. MPC is known as zwitterionic materials with excellent antifouling and good biocompatibility properties. Oligomeric MPS-MPC2.5 shows the excellent resistance of both bacterial adhesion and protein adsorption after modification. Moreover, oligomeric MPS-Carboxylated PEGMA2.5 as a bulky structure contains large carboxyl groups transforming into a functional intermediated product for bio-recognition elements by amine coupling chemistry. In the target detection study, surface modification by mixing 70% MPS-Carboxylated PEGMA2.5 and 30% MPS-MPC2.5 in the molar ratio could reduce significantly non-specific adsorption and develop a sensing surface in the enzyme-linked immunosorbent assay (ELISA). In a wide range of concentration tests, mixed oligomeric coatings demonstrated a non-linear response between bovine serum albumin concentration and detection signal in the multiple antigen concentrations from 25 ?g/mL to 1000 ?g/mL. In addition, it provided a linear response from 5.5 ?g/mL to 27.5 ?g/mL of HRP conjugated secondary antibody detection through a bioreceptor connected with an active site on the surface. Therefore, mixed oligomeric silatranes coatings are a potential approach to establish the interfacial system for biosensors because of the antifouling properties, improving target detection capability by increasing carboxyl group molecule surface’s density.
