Glutenin-directed gold nanoclusters employed for assaying vitamin B1†
Various nanoclusters have been conceived to sense different targets by virtue of their promising fluorescence signals. Herein, glutenin-directed gold nanoclusters (AuNCs@Glu) with red fluorescence have been synthesized. Meaningfully, the nanoclusters exhibited multiple advantages, including favorable photostability, low toxicity and stability. The –COOH, –NH2, –OH, and –CO groups on the surfaces of AuNCs@Glu facilitate possible applications of the nanoclusters towards sensing. Thus, the abundant carboxyl and hydroxyl groups of AuNCs@Glu enable vitamin B1 to be adsorbed on the surface, leading to obvious fluorescence quenching through emerging aggregation. On the basis of this phenomenon, AuNCs@Glu were applied for detecting Vitamin B1; they achieved a linear range of 8 to 8000 μm with a detection limit of 115 nM, which broadens the avenues of assaying vitamin B1.