Corn-derived Dendrimer-like Carbohydrate Phytoglycogen Nanoparticles as Selective Fluorescent Sensor for Silver Ions
2019
Wang, Sen | Farnood, Ramin | Yan, Ning
A dendrimer-like carbohydrate phytoglycogen (PG) extracted from corn was modified as a fluorescent nanocarrier via a simple method. Fluorescein was successfully linked to PG through the bridge APTES by covalent bonds. NMR, XPS, UV spectroscopy, fluorescence spectroscopy, confocal microscopy, etc. validated the high feasibility and efficiency of the preparation of fluorescent phytoglycogen (F-PG). The structure of F-PG was investigated by TEM and XRD which showed amorphous nature and very uniform spherical or cauliflower-like shape with highly branched structures inside. The fluorescent carbohydrate nanoparticles inherited the high stability and excellent dispersibility in water, which was proved by DLS. Furthermore, ratiometric response towards silver ions could be obtained from fluorescence spectroscopy conducted in aqueous media without the need of adding organic solvents, with good linearity (R2 = 0.993) and high selectivity, indicating the great potential of this renewable biopolymer as a sensor for silver ions in aqueous solution.
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