title: Functionalization of platinum nanoparticles for electrochemical detection of nitrite.
abstract: In this work, a novel electrochemical method for nitrite detection by using functionalized platinum nanoparticles (PtNPs) is proposed. Firstly, a gold electrode is immobilized with 4-(2-aminoethyl)benzenamine. Then, PtNPs are modified with 5-[1, 2]dithiolan-3-yl-pentanoic acid [2-(naphthalene-1-ylamino)-ethyl]amide (DPAN). Consequently, in the presence of nitrite ions, Griess reaction occurs between 4-(2-aminoethyl)benzenamine on the electrode and DPAN on PtNPs, thus PtNPs are localized onto the electrode surface. So, PtNPs-electrocatalyzed reduction of H(2)O(2) can be achieved to correlate the electrochemical signal with the concentration of nitrite ions. The linear concentration range can be as wide as 10-1,000 μM, while the detection limit is as low as 5 μM. The proposed method has been also successfully applied to the detection of nitrite with the local lake water, and the result is well consistent with that obtained by UV-visible spectrophotometric method. So, this method has potential use for monitoring nitrite in drinking water supplies in the future.
authors.affiliation: Laboratory of Biosensing Technology, School of Life Science, Shanghai University, China.
authors.forename: Peng
authors.initials: P
authors.lastname: Miao
authors.forename: Min
authors.initials: M
authors.lastname: Shen
authors.forename: Limin
authors.initials: L
authors.lastname: Ning
authors.forename: Guifang
authors.initials: G
authors.lastname: Chen
authors.forename: Yongmei
authors.initials: Y
authors.lastname: Yin
mesh_terms: D055664:Electrochemical Techniques / Q000295:instrumentation*; D004566:Electrodes; D004867:Equipment Design; D006046:Gold / Q000737:chemistry; D057230:Limit of Detection; D053758:Nanoparticles / Q000737:chemistry*; D009573:Nitrites / Q000032:analysis* / Q000737:chemistry; D010984:Platinum / Q000737:chemistry*; D014873:Water Pollutants / Q000032:analysis*
chemical_list: D009573:Nitrites; D014873:Water Pollutants; D010984:Platinum; D006046:Gold