Food Chemistry: X (Dec 2022)

Quinone-mediated non-enzymatic browning in model systems during long-term storage

  • Jingjing Su,
  • Yaqian Geng,
  • Jinbo Yao,
  • Yuan Huang,
  • Junfu Ji,
  • Fang Chen,
  • Xiaosong Hu,
  • Lingjun Ma

Journal volume & issue
Vol. 16
p. 100512

Abstract

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Non-enzymatic browning induced by polyphenol oxidation is an essential problem during the processing and storage of fruit and vegetable products. Here, the non-enzymatic browning mechanism between catechin (CAT), chlorogenic acid (CQA) and their corresponding quinones was investigated in model systems during the 32-d long-term storage. The results showed that CAT and catechin quinone (CATQ), which contains both A ring with a resorcinol structure and an o-diphenol B ring, are important precursors for browning, while chlorogenic acid (CQA) has a minor effect on browning. Chlorogenic acid quinone (CQAQ)-mediated CAT oxidation (kCAT-degradation = 0.0458 mol·L−1·d−1) was faster than CAT autoxidation (kCAT-degradation = 0.0006 mol·L−1·d−1), and there was no significant difference between CQAQ-mediated CAT oxidation and CATQ-mediated CQA oxidation. These indicate that CQAQ oxidizes CAT to CATQ quickly, and CATQ reacts with CAT subsequently through complex reactions to produce brown pigments in model systems during long-term storage.

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