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排序方式: 共有161条查询结果,搜索用时 0 毫秒
31.
The development of a new type of microsensors based on chemically sensitive field-effect transistors (CHEMFETs) covered with
polymeric bulk ion-partitioning membranes is presented. For the construction of the microsensor, a PVC plasticized membrane
containing two ionophores, one selective to protons and the other to the analyte cation of interest, is placed on the gate
of a pH sensitive field-effect transistor which acts as the transducer. With the use of thin (5–10 μm) ion-partitioning membranes
onto the pH-sensitive ISFET gate, the proton displacement out of the membrane and to the pH sensitive gate is fast and reversible.
This displacement generates a signal that is directly related to the analyte concentration found in the test solution. Comparing
the performance of CHEMFETs and ISEs selective to the monovalent potassium cation and the divalent calcium ion validates this
novel CHEMFET response mechanism. 相似文献
32.
Carbon nanotube array-based biosensor 总被引:8,自引:0,他引:8
Aligned multi-wall carbon nanotubes (MWNT) grown on platinum substrate are used for the development of an amperometric biosensor. The opening and functionalization by oxidation of the nanotube array allows for the efficient immobilization of the model enzyme, glucose oxidase. The carboxylated open-ends of nanotubes are used for the immobilization of the enzymes, while the platinum substrate provides the direct transduction platform for signal monitoring. It is also shown that carbon nanotubes can play a dual role, both as immobilization matrices and as mediators, allowing for the development of a third generation of biosensor systems, with good overall analytical characteristics. 相似文献
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Andrew J. Smaligo Jason Wu Nikolas R. Burton Allison S. Hacker Aslam C. Shaikh Jason C. Quintana Ruoxi Wang Changmin Xie Ohyun Kwon 《Angewandte Chemie (International ed. in English)》2020,59(3):1211-1215
Reported herein is a one‐pot protocol for the oxodealkenylative introduction of carbonyl functionalities into terpenes and terpene‐derived compounds. This transformation proceeds by Criegee ozonolysis of an alkene, reductive cleavage of the resulting α‐alkoxy hydroperoxide, trapping of the generated alkyl radical with 2,2,6,6‐tetramethylpiperidin‐1‐yl (TEMPO), and subsequent oxidative fragmentation with MMPP. Using readily available starting materials from chiral pool, a variety of carbonyl‐containing products have been accessed rapidly in good yields. 相似文献
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Ioannis Tsagkatakis Nikolas Chaniotakis Reiner Altmann Klaus Jurkschat Rudolph Willem JosC. Martins Yu Qin Eric Bakker 《Helvetica chimica acta》2001,84(7):1952-1961
The selective recognition of the orthophosphate anion by a series of bifunctional Lewis acidic organotin compounds is investigated. The binding affinity of these carriers to anions, as measured by NMR titrations in CH2Cl2 obeyed the potentiometric selectivity order phosphate > sulfate > perchlorate, and provided the corresponding complex‐formation constants. More accurate calculations of these values were obtained by the segmented‐sandwich‐membrane method performed directly inside the liquid polymeric membrane. These carriers were also studied potentiometrically in polymeric liquid membranes. The results indicate that (PhBr2Sn)2CH2 is 2 to 5 orders of magnitude more selective towards phosphate over other oxoanions. These results set the ground for the development of a new series of highly selective anions carriers with a wide range of possible applications. 相似文献
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ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF. 相似文献