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Chemiluminescence behavior of CdTe-hydrogen peroxide enhanced by sodium hypochlorite and sensitized sensing of estrogens.

Ling B, Bi J, Pi Z, Dong H, Dong L - Nanoscale Res Lett (2014)

Bottom Line: It has been found that sodium hypochlorite enhanced the chemiluminescence (CL) of the CdTe nanocrystal (NC)-hydrogen peroxide system and that estrogens inhibited these CL signals in alkaline solution.CL spectra were used to investigate the mechanism of the CL enhancement.On the basis of the inhibition, a flow-injection CL method has been established for determination of three natural estrogens.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Chemical and Chemical Engineering, Hefei Normal University, Hefei 230061, People's Republic of China.

ABSTRACT
It has been found that sodium hypochlorite enhanced the chemiluminescence (CL) of the CdTe nanocrystal (NC)-hydrogen peroxide system and that estrogens inhibited these CL signals in alkaline solution. CL spectra were used to investigate the mechanism of the CL enhancement. On the basis of the inhibition, a flow-injection CL method has been established for determination of three natural estrogens.

No MeSH data available.


Chemiluminescence spectra of the CL system.
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Figure 10: Chemiluminescence spectra of the CL system.

Mentions: In order to investigate the reaction mechanism of CL enhancement and confirm the emission species, the following experiments were performed. Firstly, the H2O2-NaClO-CdTe NCs (2.60 nm) CL spectrum was recorded using a BPCL-2-KIC Ultra-Weak Luminescence. The obtained CL spectrum was shown in Figure 8, which clearly indicated that the maximal peak was at 555 nm. As is known, PL spectra of the stable excited states should be identical to CL spectrum, which was demonstrated in our results comparing PL spectra (Figure 3) with CL spectrum (Figure 10). Then, some coexisting substrates (GSH and CdCl2 solutions) were injected in turn into H2O2-NaClO solutions one by one, but no CL signal was found. Therefore, the excited states of the observed CL must be CdTe NCs that were generated in situ during the chemical reaction in the H2O2-NaClO-CdTe NCs CL system. The states of CdTe NCs, before and after CL reactions, were also examined. It was found that the characteristic peaks of PL emission and UV–Vis absorption for CdTe NCs disappeared after CL reactions. These results demonstrated that the nanocrystal lattice structure of CdTe NCs has been destroyed completely after being oxidized by enough H2O2. Thus, the CL reaction can be described in its simplest form as follows:


Chemiluminescence behavior of CdTe-hydrogen peroxide enhanced by sodium hypochlorite and sensitized sensing of estrogens.

Ling B, Bi J, Pi Z, Dong H, Dong L - Nanoscale Res Lett (2014)

Chemiluminescence spectra of the CL system.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4012748&req=5

Figure 10: Chemiluminescence spectra of the CL system.
Mentions: In order to investigate the reaction mechanism of CL enhancement and confirm the emission species, the following experiments were performed. Firstly, the H2O2-NaClO-CdTe NCs (2.60 nm) CL spectrum was recorded using a BPCL-2-KIC Ultra-Weak Luminescence. The obtained CL spectrum was shown in Figure 8, which clearly indicated that the maximal peak was at 555 nm. As is known, PL spectra of the stable excited states should be identical to CL spectrum, which was demonstrated in our results comparing PL spectra (Figure 3) with CL spectrum (Figure 10). Then, some coexisting substrates (GSH and CdCl2 solutions) were injected in turn into H2O2-NaClO solutions one by one, but no CL signal was found. Therefore, the excited states of the observed CL must be CdTe NCs that were generated in situ during the chemical reaction in the H2O2-NaClO-CdTe NCs CL system. The states of CdTe NCs, before and after CL reactions, were also examined. It was found that the characteristic peaks of PL emission and UV–Vis absorption for CdTe NCs disappeared after CL reactions. These results demonstrated that the nanocrystal lattice structure of CdTe NCs has been destroyed completely after being oxidized by enough H2O2. Thus, the CL reaction can be described in its simplest form as follows:

Bottom Line: It has been found that sodium hypochlorite enhanced the chemiluminescence (CL) of the CdTe nanocrystal (NC)-hydrogen peroxide system and that estrogens inhibited these CL signals in alkaline solution.CL spectra were used to investigate the mechanism of the CL enhancement.On the basis of the inhibition, a flow-injection CL method has been established for determination of three natural estrogens.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Chemical and Chemical Engineering, Hefei Normal University, Hefei 230061, People's Republic of China.

ABSTRACT
It has been found that sodium hypochlorite enhanced the chemiluminescence (CL) of the CdTe nanocrystal (NC)-hydrogen peroxide system and that estrogens inhibited these CL signals in alkaline solution. CL spectra were used to investigate the mechanism of the CL enhancement. On the basis of the inhibition, a flow-injection CL method has been established for determination of three natural estrogens.

No MeSH data available.