4.7 Article

Bio-inspired Nanoenzyme Synthesis and Its Application in A Portable Immunoassay for Food Allergy Proteins

期刊

JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
卷 69, 期 49, 页码 14751-14760

出版社

AMER CHEMICAL SOC
DOI: 10.1021/acs.jafc.1c04309

关键词

nanozymes; surface-enhanced Raman scattering; immunoassay; food allergy proteins; biosensing

资金

  1. National Natural Science Foundation of China [32022069, 22076115]

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A novel nanozyme-enhanced SERS immunoassay platform was successfully developed, utilizing a peroxidase-mimicking nanozyme to replace natural enzymes for the detection of allergy proteins. This platform showed improved accuracy, high sensitivity, and good selectivity in detecting alpha-lactalbumin, with a low detection limit of 0.01 ng/mL, and demonstrated satisfactory results in food samples, providing insights into the use of nanozymes in analytical methods and food safety assays.
Nanozymes as a cost-effective and robust enzyme mimic have attracted widespread attention in the development of novel analytical methods. Herein, a new nanozyme-enhanced surface-enhanced Raman scattering (SERS) immunoassay platform was successfully developed using a peroxidase-mimicking nanozyme to replace the natural enzymes as a catalytic label of the enzyme-linked immunosorbent assay for the detection of allergy proteins. In this platform, the peroxidase-mimicking nanozymes as a catalytic label could catalyze the oxidation of the Raman-inactive reporter [i.e., leucomalachite green (LMG)] to generate Raman-active malachite green (MG) with H2O2. Moreover, the produced MG Raman signal was further enhanced by the formed Raman hot spot through MG-induced gold nanoparticle aggregation, which could be recorded by a portable Raman spectrometer. On this basis, the established nanozyme-enhanced SERS immunoassay showed improved accuracy, high sensitivity, and good selectivity and was used for accurate quantification of alpha-lactalbumin (alpha-LA). With this method, alpha-LA could be detected with a limit of detection as low as 0.01 ng/mL. Moreover, the method was also verified by performing in food samples and showed satisfactory recoveries and high reliability. This study not only provides insight into the use of a nanozyme to establish new analytical methods but also broadens the applications of nanozymes in a food safety assay.

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