Cinnamic acids gentisic acid from

The boll weevil antifeedants, anthranilic acid, gentisic acid, senecioic acid, trans-cinnamic acid, trans-cinnamaldehyde and camphor have been Isolated from the Peruvian plant Alchornea triplinervia (Euphorbiaceae). Anthranilic acid and camphor also showed significant Inhibition of growth of the tobacco budworm. 

The results of the boll weevil antifeedant bioassays with anthrani-lic acid, gentisic acid, senecioic acid, cinnamaldehyde and cinnamic acid are presented in Table II. Camphor was not bio-assayed due to its extreme volatility. However camphor is a known moth repellent (8) and is probably a boll weevil antifeedant since the fraction from which it was isolated was active. 

From the cinnamic acids or phenyl propanoids described above, / -oxidation and truncation of side chains yields a variety of benzoic or simple phenolic acids [28], Rao et al., [22] identified gallic acid (18), gentisic acid (19), protocatechuic acid (20), />-hydroxybenzoic acid (21), oc-resorcyclic acid (22), vanillic acid (23) and salicylic acid (24) in C. arietinum and showed that overall, leaf content of all phenolic compounds was much greater than in roots and stem. They postulated that the production of these compounds may enhance the activity of indole acetic acid oxidase or may express antimicrobial properties when leached into the soil. However, Singh et al. [24] showed that the production of both 18 and 24 by C. arietinum was induced when treated by the culture filtrate of Sclerotium rolfsii along with the phenyl propanoids 14, 15 and 17 mentioned above. 

Phenolic acids and coumarins Two families of phenolic acids are widely distributed in plants - a range of substituted benzoic (Cg-Ci) acid derivatives and those derived from cinnamic (C -C ) acid. Both types of phenolic acids usually occur in conjugated or esterified form. The simpler types of benzoic acid derivatives include p-hydroxybenzoic, protocatechuic, vannilic, gallic and syringic acids, and the o-hydroxy salicylic and gentisic acids (Fig. 1). The cinnamic acids p-coumaric, caffeic, ferulic, and sinapic, are found in most oilseeds and occur frequently in the form of esters with quinic acid or sugars (Fig. 1). Chlorogenic... 

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