A fluorescence turn-off-on chemosensor based on carbon nanocages for detection of ascorbic acid. Issue 48 (12th June 2017)

• Record Type: Journal Article
• Authors: Bi, Jingran; Wang, Haitao; Kamal, Tariq; Zhu, Bei-Wei; Tan, Mingqian
• Is Part Of: RSC advances. Volume 7:Issue 48(2017)
• Page Start: 30481
• Page End: 30487
• Publication Date: 2017-06-12
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c7ra04394e
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : A type of carbon nanocages has been constructed through grilling of turbot by a facile method, and applied successfully as a fluorescent probe for rapid, selective as well as sensitive detection of ascorbic acid. Abstract : A new type of carbon nanocages (CNCs) has been constructed through grilling of turbot ( Scophthalmus maximus L.) by a facile method, and applied successfully as a fluorescent probe for rapid, selective as well as sensitive detection of ascorbic acid (AA). The one-step fabricated CNCs were thoroughly characterized by transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR) and UV-vis spectroscopy. The CNCs showed very selective and sensitive quenching in the presence of Fe 3+ . The quenching efficiency of the CNCs was significantly correlated with the concentration of Fe 3+ in the range 20–110 μM. The linear regression equation is y = 0.00868 x − 0.0981 ( R 2 = 0.993) with the detection limit of the CNCs for Fe 3+ at 3.96 μM. Furthermore, the fluorescence of CNCs–Fe 3+ displayed a turn-on behavior upon adding AA due to the reduction of Fe 3+ to Fe 2+ . A good linear relationship between the AA concentration and fluorescence intensity was obtained in the range of 2 to 12 μM ( R 2 = 0.998) with a detection limit of 97.2 nM of AA. The selectivity of the CNCs–Fe 3+ for the detection of AA was explored in the presence of other possible reducing agents. Only AA induced a significant fluorescence restoration of CNCs–Fe 3+, the signal being approximately 5-fold greater than with other reducing agents (uric acid, dopamine, human serum albumin, d -glucose and hemoglobin). Notably, the developed probe was successfully applied for the quantitative detection of AA in vitamin tablets with recoveries from 99.77% to 104.76%.