Application of a Novel “Turn-on” Fluorescent Material to the Detection of Aluminum Ion in Blood Serum

A novel “turn-on” fluorescent bioprobe, 1,2,3,4,5-penta­(4-carboxyphenyl)­pyrrole sodium salt (PPPNa), with aggregation-enhanced emission characteristics was synthesized for the in situ quantitative detection of Al3+ in serum. It exhibited a high selectivity to Al3+ in both simulated serum and fetal...

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Bibliographic Details
Published in:ACS applied materials & interfaces 2018-07, Vol.10 (28), p.23667-23673
Main Authors: Liu, Pai, Li, Wangyang, Guo, Shuai, Xu, Dongrui, Wang, Mengni, Shi, Jianbing, Cai, Zhengxu, Tong, Bin, Dong, Yuping
Format: Article
Language:English
Subjects:
Aluminum - blood
Animals
Cell Line
Fluorescent Dyes
Humans
Mice
Spectrometry, Fluorescence
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Summary:A novel “turn-on” fluorescent bioprobe, 1,2,3,4,5-penta­(4-carboxyphenyl)­pyrrole sodium salt (PPPNa), with aggregation-enhanced emission characteristics was synthesized for the in situ quantitative detection of Al3+ in serum. It exhibited a high selectivity to Al3+ in both simulated serum and fetal calf serum with no interferences from other metal ions or serum components observed and no isolation required. A weak interaction between PPPNa and serum albumin was found, which caused no interference, but enhanced fluorescence response of PPPNa to Al3+ and improved detection sensitivity. The limit of detection was determined to be 1.50 μmol/L Al3+ in phosphate-buffered saline solution containing 33 μg/mL bovine serum albumin (BSA) and decreased to 0.98 μmol/L as BSA concentration increased to 100 μg/mL. The fluorescence “turn-on” mechanism of the PPPNa probe to detect Al3+ was proposed. A bidentate complex is formed between the carboxy group of PPPNa and Al3+, causing the photoluminescence (PL) emission enhancement by aggregation. BSA chains further strengthen the stacking compactness of the aggregates of PPPNa and Al3+ and consequently enhance the PL emission of PPPNa by further promoting the restriction of intramolecular rotation of the phenyl ring. Its application to the in situ Al3+ was successfully demonstrated with HeLa cells and NIH 3T3 cells. The low cytotoxicity and highly selective response of PPPNa to Al3+ endow its great potentials to in vivo detecting and imaging of Al3+ as well as an absorbent of Al3+.
ISSN:1944-8244
1944-8252
DOI:10.1021/acsami.8b07658