Impact of AB-8 Macroporous Adsorption Resin on the Recovery and Antioxidant Activity of Phenolic Compounds Derived From Lignin
Corressponding author's email:
tiennv@hcmute.edu.vnDOI:
https://doi.org/10.54644/jte.2025.1982Keywords:
Lignin valoriaztion, Lignin oxidation, Phenolic enrichment, Macroporous AB-8 resin, AntioxidationAbstract
Lignin, a polyphenol-rich byproduct of the wood industry, represents a potential source of natural antioxidants but is limited by its complex structure and inactive impurities. For the first time, AB-8 macroporous adsorption resin was employed as a selective adsorbent to enhance the recovery efficiency and antioxidant activity of phenolic compounds after lignin oxidation with the H2O2/Cu2+ system. Experiments on model compounds (vanillin, syringaldehyde, and p-hydroxybenzaldehyde) demonstrated that AB-8 resin significantly improved recovery yields, particularly for p-hydroxybenzaldehyde, which has not been reported in previous studies. This highlights the pivotal role of AB-8 in the purification and enrichment of phenolics. In practical application to oxidized lignin, AB-8-treated extracts exhibited an 8.9% increase in total polyphenol content and superior antioxidant capacity compared with the non-adsorbed sample, with IC50 reduced from 18.89 to 13.59 µg/mL and the antioxidant activity index (AAI) rising from 1.32 to 1.84, approaching that of Butylated Hydroxytoluene (AAI = 2.51). These results confirm AB-8 as an efficient and scalable adsorbent for the production of natural antioxidants.
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