p-Hydroxybenzaldehyde

p-Hydroxybenzaldehyde (CAS No.: 123-08-0) is an aromatic hydroxybenzaldehyde compound widely recognized as a naturally occurring constituent of plant-derived materials, including those contributing to vanilla aroma, and is commonly utilized as a biochemical probe in neuropharmacological and enzymatic research. Structurally classified within phenolic aldehydes, it has attracted attention for its modulatory effects on neurotransmission, particularly through antagonistic activity at GABA_A receptor subtypes such as α1β2γ2S at elevated concentrations, as well as its inhibitory action on GABA transaminase, implicating it in the regulation of GABA metabolism and signaling pathways. These properties position p-hydroxybenzaldehyde as a useful small molecule for investigating inhibitory neurotransmission and enzyme-mediated neurotransmitter turnover in central nervous system models. Reported in vitro activities are generally observed in the micromolar concentration range, although experimental conditions and system-specific variables can influence potency and selectivity. In laboratory settings, it is frequently employed in cell-based assays and biochemical studies aimed at characterizing receptor pharmacology, enzyme inhibition, and neuroactive compound screening, with dosing strategies tailored to specific experimental designs and research objectives.