Smartphone-assisted fast detection of Total antioxidant capacity in fruit and vegetable food based on the excellent peroxidase-like property of Fe-MOF.

The total antioxidant capacity (TAC) has received increasing attention for the evaluation of food quality in recent years. In this work, we reported on a novel Fe-MOF material, which exhibited excellent peroxidase-like properties. Based on this property, smartphone-assisted fast detection of TAC in fruit and vegetable food was developed. The TAC determination strategy, which was described by vitamin C (AA), glutathione (GSH) and L-cysteine (L-Cys), manifested a very fast detection efficiency in just 10 s. Notably, the Fe-MOF paper-based sensor exhibited the LOD (lowest detection limit) for AA, GSH and L-Cys of 141.5 μM, 469.4 and 19.8 μM, respectively. Besides, this sensor exhibited a very long service life for about 100 days, and manifested strong anti-interference and selectivity for TAC determination.