gallic acid

Overview

Gallic acid is a naturally occurring phenolic acid widely distributed in plants and plant-derived foods. Chemically, it is a trihydroxybenzoic acid and is commonly discussed in biomedical research as a bioactive phytochemical with antioxidant, anti-inflammatory, antibacterial, and formulation-relevant properties. In the recent literature provided, gallic acid is treated less as a conventional drug target and more as a functional bioactive compound or delivery cargo whose physicochemical and biological properties can be leveraged in pharmaceutical and biomaterial systems.

Its biomedical interest stems from a combination of intrinsic activity and formulation challenges. Gallic acid is repeatedly associated with redox-modulating and antimicrobial effects, but its hydrophilic nature can limit membrane permeation and localized bioavailability, as noted in skin-delivery research. As a result, recent studies have focused on encapsulation, co-delivery, and surface-functionalized delivery platforms to improve intestinal adhesion, tissue retention, sustained release, and therapeutic performance in contexts such as oral supplementation, wound healing, atopic dermatitis, food preservation, and antibacterial materials.

Focus of Latest Publications

Recent publications on gallic acid have focused on its antioxidant, anti-inflammatory, neuroprotective, and formulation-related properties, as well as its use as an analytical target in complex matrices. In a Parkinson’s disease cell model, gallic acid was evaluated for protection against 1-methyl-4-phenylpyridinium (MPP⁺)-induced neurotoxicity in SH-SY5Y dopaminergic cells, reflecting interest in its ability to counter oxidative stress–related neuronal injury. In another study, gallic acid was identified as a key discriminatory marker during stir-baking processing of Paeoniae Radix Alba, where its content increased markedly with processing intensity and was linked to the degradation of 1,2,3,4,6-O-pentagalloylglucose.

Several studies examined gallic acid as a bioactive constituent within plant extracts. LC-MS/MS profiling of Fagonia cretica and Ficus natalensis fruit identified gallic acid among major phenolic constituents associated with antioxidant and anti-inflammatory activity, respectively. In Chaerophyllum aksekiense, gallic acid showed organ-specific distribution and correlation analysis suggested it contributed importantly to both antioxidant and enzyme-modulatory effects, alongside caffeic acid. These studies collectively place gallic acid among the phenolic compounds associated with broad in vitro bioactivity in medicinal plants.

Gallic acid was also the focus of analytical and delivery-oriented research. A polyethyleneimine-based magnetic molecularly imprinted polymer was developed for selective enrichment and highly sensitive HPLC determination of gallic acid in tea, achieving high adsorption capacity, good selectivity, and low detection limits. In formulation studies, gallic acid-loaded trehalosomes incorporated into an HPMC hydrogel improved dermal retention and sustained release, and in a dinitrochlorobenzene-induced atopic dermatitis mouse model the system reduced disease severity while restoring antioxidant defenses, including superoxide dismutase, and lowering inflammatory cytokines such as interleukin-6 and TNF-α.

Additional work explored gallic acid in combination systems. A bigel microstructure designed for low-fat cream cheese simulation enabled co-delivery of pterostilbene and gallic acid, with the O1/W/O2 architecture improving intestinal release of gallic acid relative to conventional bigels. Gallic acid was also incorporated into cyclodextrin-siderophore conjugates as part of a Trojan horse strategy for bacterial targeting, where the conjugates were investigated as doxycycline carriers against Escherichia coli and Staphylococcus aureus.

Key Publications

NEWJun Neuroprotective effects of gallic acid in an MPP⁺-induced SH-sy5y cell model of parkinson's disease. (Molecular biology reports, 2026, PMID 42319576): "The research evaluated Gallic Acid (GA) as a natural polyphenol with proven antioxidant properties for its ability to protect cells from 1-methyl-4-phenylpyridinium (MPP⁺)-induced neurotoxicity in SH-SY5Y dopaminergic cell models."
NEWJul UPLC Multiwavelength Quantification and PLS-DA Reveal Stir-Baking Degree-Dependent Marker Dynamics in Paeoniae Radix Alba. (Biomedical chromatography : BMC, 2026, PMID 42289366): "Oxypaeoniflorin, catechin, paeoniflorin, and benzoylpaeoniflorin decreased progressively with increasing processing intensity, whereas gallic acid increased markedly from PRA to cPRA."
Jun Liquid Chromatography-Electrospray Ionization-Tandem Mass Spectrometry Profiling, Antioxidant, Antibacterial, and Antidiabetic Properties of Fagonia cretica L.: Insights From In Vitro and In Silico Approaches. (ChemistryOpen, 2026, PMID 42168772): "The phytochemical profile, established by LC-ESI-MS/MS, revealed a predominance of phenolic acids (salicylic, ferulic, sinapic, gallic), flavonoids (quercetin, luteolin, apigenin, catechin, epicatechin), and the stilbene resveratrol."
May Profiling metabolites of Ficus natalensis hochst. fruit by UPLC-MS/MS and evaluation of anti-inflammatory activity. (Scientific reports, 2026, PMID 42129402): "Major bioactive constituents, including ellagic acid, gallic acid, betulinic acid, and quercetin derivatives, were identified and may underline the observed anti-inflammatory effect."
May Organ-Specific Phytochemical Composition and Bioactivity Profiling of Chaerophyllum aksekiense: A Multiassay Antioxidant, Enzyme Inhibition, and Correlation-Based Evaluation. (ChemistryOpen, 2026, PMID 42051056): "LC-ESI-MS/MS analysis revealed distinct distribution patterns of key compounds, including hyperoside, gallic acid, caffeic acid, and hydroxybenzoic acids."
Jun Polyethyleneimine-based magnetic molecularly imprinted polymer for selective enrichment and highly sensitive determination of gallic acid in tea. (Food chemistry, 2026, PMID 41950704): "A polyethyleneimine-functionalized magnetic molecularly imprinted polymer (MHNT-PEI@MIP) was developed for selective enrichment and detection of gallic acid (GA) in complex tea matrices."
Apr Immuno-redox modulator loaded trehalosomal hydrogel for atopic dermatitis: formulation, optimization using D-optimal mixture design, in-vitro and in-vivo evaluation. (International journal of pharmaceutics, 2026, PMID 41864443): "Gallic acid (GA) offers significant potential for managing atopic dermatitis (AD) owing to its potent antioxidant and anti-inflammatory properties; however, its hydrophilic nature (log P 0.7) severely limits skin permeation and localized bioavailability."
May A novel bigel type featured as O1/W/O2 microstructure achieved by whey protein aggregates as dual-interfaces mediator: Enabling dual functions in low-fat cream cheese simulation and co-delivery of pterostilbene/gallic acid. (Food chemistry, 2026, PMID 41833138): "Sequential degradation of each phase during digestion (O2-W-O1) increased the intestinal release of PTS and GA by up to 3.3-fold and 1.8-fold, respectively, over conventional bigels (O/W or bicontinuous)."
Jun Cyclodextrin-siderophore conjugates as a Trojan horse strategy for bacterial targeting. (Journal of inorganic biochemistry, 2026, PMID 41724131): "We synthesized new cyclodextrin conjugates with siderophores, such as deferoxamine and gallic acid, to exploit the cyclodextrin drug inclusion capability within the Trojan horse strategy."