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Oleanolic aldehyde is an antimicrobial compound used to inhibit oral bacteria. Oleanolic aldehyde inhibits Streptococcus mutans and Porphyromonas gingivalis, which are associated with dental caries and periodontal disease, with minimum inhibitory concentrations (MICs) of 488 μg/mL and 250 μg/mL, respectively[1].

ChEBI: A pentacyclic triterpenoid and hydroxyaldehyde that is erythrodiol in which the primary hydroxy group at position 28 has been oxidised to the corresponding aldehyde. It is found in grapes and olives.

[1] Rivero-Cruz J F, et al. Antimicrobial constituents of Thompson seedless raisins (Vitis vinifera) against selected oral pathogens[J]. Phytochemistry letters, 2008, 1(3): 151-154.