Journal
POLYMER CHEMISTRY
Volume 5, Issue 14, Pages 4251-4258Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4py00120f
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Funding
- National Science Foundation of China [51103046]
- Ministry of Science and Technology
- 973 project [2010CB732204]
- Fundamental Research Funds for the Central Universities, SCUT [2013ZM0053]
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A novel sensing colloidal nanoprobe and indicator paper based on fluorescent carboxymethyl chitosan grafted poly(p-dioxanone) (CMCs-g-PPDO) copolymer nanomicelles which encapsulate hydrophobic conjugated polymer-poly(9,9-dioctylfluorene) (PFO) were developed for the fast and sensitive determination of banned food dye Sudan I. The PFO/CMCs-g-PPDO colloidal solution can selectively detect Sudan I in aqueous media among commonly appearing natural pigments: beta-carotene, Monascorubrin and Lycopene. The sensing constant (K-sv) for the PFO/CMCs-g-PPDO aqueous solution toward Sudan I was 1.74 x 10(7) M-1, which was over 400 times larger than that of single PFO in toluene solution, due to the maximized interaction between the sensing material and the analyte within the chitosan-based nanomicelles. The fluorescent indicator paper functionalized with PFO/CMCs-g-PPDO also showed outstanding selectivity for Sudan I. By using this flexible and portable indicator paper, Sudan I dye could be immediately and visually distinguished from natural pigments. This material could be used for real-time and on-site food safety testing.
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