Study on mechanism of antioxidant activity change of flavonoids in simulated frying system

  • DONG Zhijie ,
  • LIU Junxin ,
  • LI Jun ,
  • DANG Liankui ,
  • FAN Zhenyu
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  • 1(Jiangsu College of Tourism, Yangzhou 225000, China)
    2(College of Smart Services, Shanghai Technology and Innovation Vocational College, Shanghai 201600, China)
    3(Qingdao Vocational and Technical College of Hotel Management, Qingdao 266000, China)
    4(Henan Anrui Biotechnology Co.Ltd., Zhengzhou 450000, China)

Received date: 2025-12-30

  Revised date: 2026-01-15

  Online published: 2026-06-15

Abstract

In this study, a simulated frying system at 180 ℃ was established to investigate the mechanisms underlying the changes in the antioxidant activity of five flavonoids in high-temperature oil.The results showed that all five flavonoids exhibited thermal instability;both their content and the overall antioxidant activity of the system decreased with prolonged heating time, yet no cytotoxic substances were generated.Fourier transform infrared spectroscopy (FTIR) analysis revealed that the addition of quercetin and EGCG to linoleic acid effectively inhibited the cleavage of linoleic acid double bonds at 180 ℃.Furthermore, these flavonoids may suppress the generation of aldehydes and ketones by forming stable products containing C—O—C bonds through reactions with fatty acids or carbonyl compounds.Analysis of quercetin degradation products using UPLC-Q-TOF-MS/MS indicated that quercetin underwent a Michael addition reaction with an oxidation intermediate of linoleic acid (a C4 short-chain aldehyde/ketone with a molecular weight of 88) to form a carbonyl-phenol adduct with a molecular weight of approximately 390 (m/z 389 [M-H]-).In conclusion, flavonoids can serve as safe antioxidants for oils.The high-temperature-induced chemical loss and the formation of carbonyl-phenol adducts with low antioxidant activity are the primary mechanisms responsible for the attenuation of their antioxidant activity in frying systems.

Cite this article

DONG Zhijie , LIU Junxin , LI Jun , DANG Liankui , FAN Zhenyu . Study on mechanism of antioxidant activity change of flavonoids in simulated frying system[J]. Food and Fermentation Industries, 2026 , 52(10) : 249 -257 . DOI: 10.13995/j.cnki.11-1802/ts.045694

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