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<p>For the first time, copper-doped amino acid carbon dots (Cu/Asp-CDs) are reported as a green peroxidase-like nanozyme. Using Cu<sup>2+</sup> as the metal dopant and L-aspartic acid (Asp) as the ligand, Cu/Asp-CDs exhibit high catalytic activity and stability. They efficiently catalyze the oxidation of butylated hydroxyanisole (BHA) in the presence of 4-aminoantipyrine (4-AP) and H<sub>2</sub>O<sub>2</sub>, producing a visible color change for rapid and specific BHA detection. Based on this, a portable, cost-effective colorimetric sensor was developed, showing high sensitivity, selectivity, and linearity from 0.67 to 66.67&#xa0;μM, with a detection limit of 0.27&#xa0;μM. To extract BHA from edible oils, a deep eutectic solvent of choline chloride and thymol (1:2 molar ratio) was used in liquid–liquid microextraction, achieving recoveries of 89.0–109.0%. Combined with the nanozyme, this method enables a practical, rapid (within 20&#xa0;min) assessment of synthetic antioxidants, offering a reliable tool for food quality monitoring.</p>

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Copper-amino acid carbon dots with peroxidase-like activity combined with DLLME for colorimetric detection of butylated hydroxyanisole in edible oils

  • 期刊论文

  • 发表日期：

    2026年1月5日

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  • Fan Yang,
  • Ya Ruan,
  • Yaling Yang

摘要

For the first time, copper-doped amino acid carbon dots (Cu/Asp-CDs) are reported as a green peroxidase-like nanozyme. Using Cu2+ as the metal dopant and L-aspartic acid (Asp) as the ligand, Cu/Asp-CDs exhibit high catalytic activity and stability. They efficiently catalyze the oxidation of butylated hydroxyanisole (BHA) in the presence of 4-aminoantipyrine (4-AP) and H2O2, producing a visible color change for rapid and specific BHA detection. Based on this, a portable, cost-effective colorimetric sensor was developed, showing high sensitivity, selectivity, and linearity from 0.67 to 66.67 μM, with a detection limit of 0.27 μM. To extract BHA from edible oils, a deep eutectic solvent of choline chloride and thymol (1:2 molar ratio) was used in liquid–liquid microextraction, achieving recoveries of 89.0–109.0%. Combined with the nanozyme, this method enables a practical, rapid (within 20 min) assessment of synthetic antioxidants, offering a reliable tool for food quality monitoring.