Citation: De An Song, Rong Ning Liang, Rui Ming Zhang, Jia Wang Ding, Jun Zhang, Wei Qin. Potentiometric detection of polyions based on functionalized magnetic nanoparticles[J]. Chinese Chemical Letters, ;2010, 21(11): 1378-1381. doi: 10.1016/j.cclet.2010.06.003 shu

Potentiometric detection of polyions based on functionalized magnetic nanoparticles

De An Song ^a,b,c, ,
Rong Ning Liang ^a,c ,
Rui Ming Zhang ^a,c ,
Jia Wang Ding ^a,c ,
Jun Zhang ^a,b,c ,
Wei Qin ^a

a Key Laboratory of Coastal Environmental Processes, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China;
b Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;
c Graduate University of Chinese Academy of Sciences, Beijing 100049, China

Received Date: 8 April 2010

Fund Project: This work was financially supported by the Chinese Academy of Sciences (No.KZCX2-YW-410), the National Natural Science Foundation of China (Nos.40776058 and 20977073), the National 863 High Technology Project of the Ministry of Science and Technology of China (No.2007AA09Z103), the Outstanding Youth Natural Science Foundation of Shandong Province (No.JQ200814) and the Taishan Scholar Program of Shandong Province.

A novel potentiometric detection strategy based on functionalized magnetic nanoparticles has been developed for rapid and sensitive sensing of polyions. Highly dispersed magnetic nanoparticles coated with ion exchanger and plasticizer could promote an in situ cooperative ion-pairing interaction between the ion exchanger and the polyion analyte in sample solution by dramatically reducing the mass-transfer distance. With applying a magnetic field, the nanoparticles can be attached to the surface of ion exchanger free polymeric membrane. The observed potential signals are related to the polyion concentrations. The proposed polymeric membrane electrode exhibits a linear relationship between the greatest potential response slope (dE/dt) and the logarithm of protamine concentration in the range of 0.05-5 μg/mL with a lower detection limit of 0.033 μg/mL.
- Potentiometry,
- Funetionalized magnetic nanoparticles,
- Polyions,
- Ion-selective electrodes
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