scholarly journals Interaction of LiYF4:Yb3+/Er3+/Ho3+/Tm3+@LiYF4:Yb3+ upconversion nanoparticles, molecularly imprinted polymers, and templates

RSC Advances ◽  
2020 ◽  
Vol 10 (59) ◽  
pp. 35600-35610
Author(s):  
Hsiu-Wen Chien ◽  
Min-Ting Tsai ◽  
Chien-Hsin Yang ◽  
Rong-Ho Lee ◽  
Tzong-Liu Wang

In this work, LiYF4:Yb0.253+/Er0.013+/Tm0.013+/Ho0.013+@LiYF4:Yb0.23+ upconverting nanoparticles (UCNP) were used as luminescent materials for the preparation of molecular imprinting polymer nanocomposites.

2016 ◽  
Vol 4 (44) ◽  
pp. 7138-7145 ◽  
Author(s):  
Hirobumi Sunayama ◽  
Takeo Ohta ◽  
Atsushi Kuwahara ◽  
Toshifumi Takeuchi

An antibiotic-imprinted cavity with two different fluorescent dyes was prepared by molecular imprinting and subsequent post-imprinting modifications (PIMs), for the readout of a specific binding event as a fluorescence signal.


Biomedicines ◽  
2021 ◽  
Vol 9 (12) ◽  
pp. 1923
Author(s):  
Cheng-Chih Lin ◽  
Hung-Yin Lin ◽  
James L. Thomas ◽  
Jia-Xin Yu ◽  
Chien-Yu Lin ◽  
...  

Programmed death-ligand 1 protein (PD-L1) is often expressed in various malignant tumors; thus, it is an appropriate marker for targeted cancer therapies. Photodynamic therapy (PDT) uses light and photosensitizers to create singlet oxygen to kill cells. An important approach to PDT is the use of upconversion nanoparticles (UCNPs) to convert near-infrared (NIR) light, which penetrates tissues well, into visible light, allowing PDT to be effective at greater tissue depths. In this work, high-temperature pyrolysis was used to prepare both the core and shell of lanthanide-doped UCNPs with lithium yttrium tetrafluoride (LiYF4) to enhance the green luminescence. The photosensitizer Merocyanine 540 (MC540) was grafted onto the magnetic nanoparticles, and then one peptide sequence from PD-L1 was used as the template and imprinted onto poly(ethylene-co-vinyl alcohol) particles formed by precipitation in a non-solvent. UCNPs in the non-solvent bath were thus entrapped in the imprinted particles to generate composite nanoparticles for the targeting and photodynamic therapy of PD-L1 in tumor cells. Finally, the in vitro cytotoxicity of the nanoparticles in HepG2 human liver cancer cells was evaluated with the continuous administration of MC540/MNPs@MIPs/UCNPs under irradiation by an NIR laser. To understand the delivery of the UCNP-embedded molecularly imprinted polymers, the intrinsic and extrinsic pathways were also investigated.


2020 ◽  
Vol 16 (3) ◽  
pp. 196-207 ◽  
Author(s):  
Yeşeren Saylan ◽  
Adil Denizli

Introduction: A molecular imprinting is one of the fascinating modification methods that employ molecules as targets to create geometric cavities for recognition of targets in the polymeric matrix. This method provides a broad versatility to imprint target molecules with different size, three-dimensional structure and physicochemical features. In contrast to the complex and timeconsuming laboratory surface modification procedures, this method offers a rapid, sensitive, inexpensive, easy-to-use, and selective approach for the diagnosis, screening and monitoring disorders. Owing to their unique features such as high selectivity, physical and chemical robustness, high stability, low-cost and reusability of this method, molecularly imprinted polymers have become very attractive materials and been applied in various applications from separation to detection. Background: The aims of this review are structured according to the fundamentals of molecularly imprinted polymers involving essential elements, preparation procedures and also the analytical applications platforms. Finally, the future perspectives to increase the development of molecularly imprinted platforms. Methods: A molecular imprinting is one of the commonly used modification methods that apply target as a recognition element itself and provide a wide range of versatility to replica other targets with a different structure, size, and physicochemical features. A rapid, easy, cheap and specific recognition approach has become one of the investigation areas on, especially biochemistry, biomedicine and biotechnology. In recent years, several technologies of molecular imprinting method have gained prompt development according to continuous use and improvement of traditional polymerization techniques. Results: The molecularly imprinted polymers with excellent performances have been prepared and also more exciting and universal applications have been recognized. In contrast to the conventional methods, the imprinted systems have superior advantages including high stability, relative ease and low cost of preparation, resistance to elevated temperature, and pressure and potential application to various target molecules. In view of these considerations, molecularly imprinted systems have found application in various fields of analytical chemistry including separation, purification, detection and spectrophotometric systems. Conclusion: Recent analytical methods are reported to develop the binding kinetics of imprinted systems by using the development of other technologies. The combined platforms are among the most encouraging systems to detect and recognize several molecules. The diversity of molecular imprinting methods was overviewed for different analytical application platforms. There is still a requirement of more knowledge on the molecular features of these polymers. A next step would further be the optimization of different systems with more homogeneous and easily reachable recognition sites to reduce the laborious in the accessibility in the three-dimensional polymeric materials in sufficient recognition features and also better selectivity and sensitivity for a wide range of molecules.


2017 ◽  
Vol 9 (47) ◽  
pp. 6682-6688 ◽  
Author(s):  
Jing Wang ◽  
Yaxin Sang ◽  
Weihua Liu ◽  
Na Liang ◽  
Xianghong Wang

In this study, a direct competitive biomimetic enzyme-linked immunosorbent assay (BELISA) method using molecularly imprinted polymers (MIPs) as artificial antibodies was developed to detect enrofloxacin (ENRO) in animal-based food.


2002 ◽  
Vol 723 ◽  
Author(s):  
David A. Spivak ◽  
Martha Sibrian-Vazquez

AbstractMolecular imprinting involves the self-assembled complexation of a substrate to functional monomers to form a pre-polymer complex which is “locked-in” to place by copolymerization with an excess of crosslinking monomer. Removal of the template leaves binding or catalytic sites that are complementary in size, shape, and functionality to the template. Most of the research in molecularly imprinted materials has focused on choice of substrate or functional monomer of the pre-polymer complex. The cross-linking monomers have primarily been EGDMA or DVB, which are commercially available. Redirecting focus on the design of crosslinking monomers for molecular imprinting, we have developed new classes of crosslinked polymers to optimize the performance of molecularly imprinted polymers. The design of the new crosslinking monomers has followed two strategies: (1) development of new crosslinked materials for formation of the supporting matrix, and (2) development of crosslinking monomers that simultaneously serve as the functional monomer. The details of the design, synthesis, polymerization and performance of these new crosslinking monomers for molecularly imprinted polymers will be reported.


2020 ◽  
Vol 8 (35) ◽  
pp. 7987-7993
Author(s):  
Tetsuro Saeki ◽  
Eri Takano ◽  
Hirobumi Sunayama ◽  
Yuri Kamon ◽  
Ryo Horikawa ◽  
...  

Novel sequential post-imprinting modifications were demonstrated on the development of multi-functionalized molecularly imprinted polymers for a biomarker glycoprotein.


RSC Advances ◽  
2015 ◽  
Vol 5 (103) ◽  
pp. 84601-84609 ◽  
Author(s):  
Li Ma ◽  
Lei Tang ◽  
Rong-Shan Li ◽  
Yan-Ping Huang ◽  
Zhao-Sheng Liu

A novel water-compatible approach suitable for molecular imprinting was described by using metal–organic gel (MOG) as the porogenic solvent.


2015 ◽  
Vol 51 (17) ◽  
pp. 3541-3544 ◽  
Author(s):  
Wei Wan ◽  
Qiang Han ◽  
Xiaoqiong Zhang ◽  
Yuming Xie ◽  
Jieping Sun ◽  
...  

Molecularly imprinted polymers were applied for selective enrichment of proteins in MALDI-TOF MS analysis for the first time.


2014 ◽  
Vol 6 (9) ◽  
pp. 3079-3085 ◽  
Author(s):  
Dong Ren ◽  
Jiang He ◽  
Haixia Zhang

A novel strategy was developed to prepare hollow molecularly imprinted polymers (HMIPs) with thin solid shells, in which a soft polystyrene core and a hard inner shell of SiO2 were introduced; this strategy combined surface molecular imprinting of Sudan I and in situ polymerization.


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