化学
纳米片
抗氧化能力
抗氧化剂
基质(水族馆)
DPPH
色谱法
核化学
生物化学
有机化学
生物
生态学
作者
Xianming Li,Fan Wang,Honghu Tang,Dongdong Li,Yuling Xiao,Bo Yang,Yi Zhao,Peng Wu
标识
DOI:10.1016/j.foodchem.2023.138158
摘要
Total antioxidant capacity (TAC) is vital for food quality evaluation. The emergence of various nanozymes with TMB as substrate offered a new avenue for TAC detection due to simple operation and fast response, but a long-standing challenge is its low activity at physiological pH, which may account for the discrepancy between the measured TAC and the actual antioxidant capacity in vivo. Herein, Au doping was explored to break the pH limitation of g-C3N4 nanosheets (CNNS) photozyme. The catalytic activities of Au@CNNS at pH 4.0 and 7.4 were 14.9- and 6.2-fold higher than that of CNNS at pH 4. The neutral pH photozymatic activity (photosensitized oxidation of TMB, oxidase mimic) of Au@CNNS was explored for sensitivity TAC detection (LOD: 1.0 μM TE), which featured more convenient operations and higher sensitivity over the DPPH assay. The proposed Au@CNNS-based photozymatic colorimetric method was explored for accurate detection of TAC in drinks and juices.
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