Synephrine HCl – Powder, 20 grams

The hydrochloride salt confers substantially improved aqueous solubility and dissolution rate compared to the free-base form, making it more practical for preparing reproducible stock solutions for in vitro receptor-binding assays and aqueous-vehicle rodent dosing protocols. Researchers should account for the additional mass contribution of the chloride counter-ion when converting between mass-based and molar-based dosing calculations across studies using different salt forms.

Synephrine HCl is studied as undergoing hepatic metabolism primarily via monoamine oxidase (MAO)-mediated oxidative deamination and phase II sulfation conjugation, with the resulting metabolites cleared predominantly through renal excretion. Pharmacokinetic studies characterising these pathways typically use MAO inhibitor co-administration to isolate the contribution of oxidative versus conjugative metabolism to overall clearance, informing dose-timing and metabolite-monitoring decisions in longer-duration in vivo protocols.

Powder format allows researchers to prepare custom-concentration stock solutions tailored to their specific solvent system and required final concentration range, offering greater flexibility for dose-response curve generation than a single fixed-concentration solution product. This is particularly relevant for in vitro receptor-binding assays requiring a wide concentration range to establish full dose-response curves, or for studies requiring a non-aqueous solvent system not compatible with a pre-formulated aqueous solution.