Abstract
CASHEW nut (Anacardium occidentale Linn.) shell liquid obtained from unroasted shells was found by Stadeler1 to consist chiefly of anacardic acid (A) (on heating, this is decarboxylated to cardanol (B)), a salicylic acid derivative with a long unsaturated side-chain in the position ortho to the carboxyl group, and cardol (C), a resorcinol derivative with a similar side-chain. Smith2 showed that the unbranched side-chain consisted of 15 carbon atoms and 2 double bonds ; other workers3 have shown that the oily liquid is really a mixture of saturated and mono-, di-, and tri-olefinic compounds in proportions that give, on average, about two double bonds per molecule. Although the surface-active properties of the sulphonated shell liquid have already been studied4, no thorough investigation has yet been carried out on anacardic acid, which, being an arylalkyl surfactant and a promising bactericidal agent, needs special attention5. Results of a preliminary study on sodium anacardate as a surfactant and bactericidal agent are reported here. .
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References
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Symes, W. F., and Dawson, C. R., J. Amer. Chem. Soc., 75, 4952 (1953). Paul, V. J., and Yeddanapalli, L. M., ibid., 78, 5675 (1956).
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BISWAS, A., ROY, A. Surface-active Characteristics of Sodium Anacardate isolated from Cashew Nut Shell Oil. Nature 182, 1299–1300 (1958). https://doi.org/10.1038/1821299b0
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DOI: https://doi.org/10.1038/1821299b0
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