Nur Aini(1*), Bambang Purwono(2), Iqmal Tahir(3)

(1) Laboratory of Organic Chemistry, Chemistry Department, Faculty of Mathematics and Natural Sciences Gadjah Mada University, Yogyakarta, Indonesia 55281
(2) Laboratory of Organic Chemistry, Chemistry Department, Faculty of Mathematics and Natural Sciences Gadjah Mada University, Yogyakarta, Indonesia 55281
(3) Austrian-Indonesian Centre for Computational Chemistry (AIC) Gadjah Mada University, Yogyakarta, Indonesia 55281
(*) Corresponding Author


Structure Activity Relationship (SAR) technique between the theoretical parameters and antioxidant activities of isoeugenol, eugenol, vanillin and their derivatives as Mannich reaction products, have been analyzed. Antioxidant activities were examined by oxidation reaction of oleic acid at 60 °C with b-carotene methods, whereas theoretical parameters of the activities were determined by calculating Bonding Dissociation Enthalpy (BDE) and net charge of oxygen atom(-OH) using AM1 semi empiric methods. The result from both test showed in the following orders: BHT > Mannich product of isoeugenol > isoeugenol > Mannich product of eugenol > eugenol > Mannich product of vanillin > vanillin. The antioxidant activities increase with small the BDE value and high the net charge. Electron donating groups will increase the antioxidants activity with lowering the BDE value and increasing the net charge, while electron-withdrawing groups will decrease antioxidants activity.


SAR; antioxidants; Bonding Dissociation Entalphy; eugenol

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Indonesian Journal of Chemistry (ISSN 1411-9420 / 2460-1578) - Chemistry Department, Universitas Gadjah Mada, Indonesia.

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