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Gallic acid ester activity changes with alkyl chain length and hydroxyl groups

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Research area:chemistry-materialsnatural-products

What the study found

The study found that the antioxidant behavior of gallic acid ester derivatives changes with their chemical structure. In particular, longer alkyl chains were linked to lower DPPH radical scavenging activity, while some hydroxyl-substituted esters kept high activity.

Why the authors say this matters

The authors conclude that understanding how gallic acid ester structure affects antioxidant behavior may help guide the design of antioxidants for specific systems. They also note that modifying the carboxyl group may improve applicability.

What the researchers tested

The researchers designed and evaluated 14 gallic acid ester derivatives, grouped into alkyl esters and hydroxyl-substituted alkyl esters. They assessed antioxidant activity using DPPH radical scavenging and tested oxidation induction time in an oil system.

What worked and what didn't

DPPH radical scavenging activity declined as alkyl chain length increased, from 91.9% for GA-C3 to 55.6% for GA-C30. GA-EG, GA-GL, and GA-PT maintained more than 90% antioxidant activity. In the oil system, all derivatives prolonged oxidation induction time, with GA-C3 showing the largest increase at 2.15 h, while GA-EG, GA-GL, and GA-PT increased it by 1.92 to 2.03 h.

What to keep in mind

The abstract does not describe study limitations or experimental constraints beyond the tested compounds and systems. The findings are limited to the 14 gallic acid ester derivatives and the antioxidant measures reported here.

Key points

  • Gallic acid ester antioxidant activity decreased as alkyl chain length increased.
  • GA-C3 had 91.9% DPPH radical scavenging activity, while GA-C30 had 55.6%.
  • Hydroxyl-functionalized esters GA-EG, GA-GL, and GA-PT kept more than 90% antioxidant activity.
  • All tested derivatives prolonged oxidation induction time in an oil system.
  • GA-C3 produced the largest oil-system effect, extending induction time by 2.15 h.

Disclosure

Research title:
Gallic acid ester activity changes with alkyl chain length and hydroxyl groups
Authors:
Qi Chen, Shuaiwei Cui, Wenwen Zhang, Gang Dong, Baoshan Tang, Jinju Ma, Juan Xu, J. Zhang, Lanxiang Liu
Institutions:
Chinese Academy of Forestry, Chinese Academy of Forestry, Chinese Academy of Forestry, Chinese Academy of Forestry, Chinese Academy of Forestry, Chinese Academy of Forestry, Chinese Academy of Forestry, Hebei Chemical and Pharmaceutical College, Research Institute of Resource Insects, Research Institute of Resource Insects, Research Institute of Resource Insects, Research Institute of Resource Insects, Research Institute of Resource Insects, Research Institute of Resource Insects, Research Institute of Resource Insects, Southwest Forestry University, Southwest Forestry University, State Forestry and Grassland Administration, State Forestry and Grassland Administration, State Forestry and Grassland Administration, State Forestry and Grassland Administration, State Forestry and Grassland Administration, State Forestry and Grassland Administration, State Forestry and Grassland Administration, State Forestry and Grassland Administration, Xinyang Agriculture and Forestry University
Publication date:
2026-01-07
DOI:
10.3390/molecules31020210
OpenAlex record:
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AI provenance: This post was generated by gpt-5.4-mini (OpenAI). The original authors did not write or review this post.

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