title: Sensory characterization of the irritant properties of oleocanthal, a natural anti-inflammatory agent in extra virgin olive oils.
abstract: Oleocanthal is an olive oil phenolic possessing anti-inflammatory activity. Anecdotal evidence suggests that oleocanthal elicits a stinging sensation felt only at the back of the throat (oropharynx). Due to this compound possessing potentially health-benefiting properties, investigation into the sensory aspects of oleocanthal is warranted to aid in future research. The important link between the perceptual aspects of oleocanthal and health benefits is the notion that variation in sensitivity to oleocanthal irritation may relate to potential differences in sensitivity to the pharmacologic action of this compound. The current study assessed the unique irritant attributes of oleocanthal including its location of irritation, temporal profile, and individual differences in the perceived irritation. We show that the irritation elicited by oleocanthal was localized to the oropharynx (P < 0.001) with little or no irritation in the anterior oral cavity. Peak irritation was perceived 15 s postexposure and lasted over 180 s. Oleocanthal irritation was more variable among individuals compared with the irritation elicited by CO(2) and the sweetness of sucrose. There was no correlation between intensity ratings of oleocanthal and CO(2) and oleocanthal and sucrose (r = -0.15, n = 50, P = 0.92 and r = 0.17, n = 84, P = 0.12, respectively), suggesting that independent mechanisms underlie the irritation of CO(2) and oleocanthal. The unusual spatial localization and independence of acid (CO(2)) sensations suggest that distinct nociceptors for oleocanthal are located in the oropharyngeal region of the oral cavity.
authors.affiliation: School of Exercise and Nutrition Sciences, Deakin University, 221 Burwood Highway, Burwood, Victoria 3125, Australia.
authors.forename: Sara
authors.initials: S
authors.lastname: Cicerale
authors.forename: Paul A S
authors.initials: PA
authors.lastname: Breslin
authors.forename: Gary K
authors.initials: GK
authors.lastname: Beauchamp
authors.forename: Russell S J
authors.initials: RS
authors.lastname: Keast
mesh_terms: D000328:Adult; D000447:Aldehydes / Q000494:pharmacology*; D000893:Anti-Inflammatory Agents / Q000494:pharmacology*; D002245:Carbon Dioxide / Q000494:pharmacology; D000081004:Cyclopentane Monoterpenes; D005260:Female; D006801:Humans; D008875:Middle Aged; D000069463:Olive Oil; D009960:Oropharynx / Q000502:physiology; D010636:Phenols / Q000494:pharmacology*; D010938:Plant Oils / Q000737:chemistry; D012684:Sensory Thresholds / Q000502:physiology*; D013395:Sucrose / Q000494:pharmacology; D013649:Taste; D013997:Time Factors; D055815:Young Adult
chemical_list: D000447:Aldehydes; D000893:Anti-Inflammatory Agents; D000081004:Cyclopentane Monoterpenes; D000069463:Olive Oil; D010636:Phenols; D010938:Plant Oils; D002245:Carbon Dioxide; D013395:Sucrose; C503534:oleocanthal