A Cycloalkanol from Derivatization Studies on Vanillin: Evaluation of Antioxidant Activity of Obtained Derivatives’
Olawale Hakeem Oladimeji,
Ekemini Samuel Idiong,
Udeme Akpan Joseph,
Victor Udo Anah,
Moji Taibat Bakare-Odunola,
Stanislaus Ngaitad Njinga,
Saad Toyin Abdullahi
Issue:
Volume 6, Issue 1, June 2022
Pages:
1-7
Received:
6 January 2022
Accepted:
27 January 2022
Published:
29 March 2022
DOI:
10.11648/j.ajqcms.20220601.11
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Abstract: Background of study: Vanillin is a white monoclinic crystalline compound whose chemical nomenclature is p-hydroxy-m-methoxy benzaldehyde. It is a phenolic aldehyde with a pleasant flavor and popularly found in vanilla beans and roasted coffee amongst many other sources. It possesses antitumor and particularly antioxidant activity which formed the essence of this study. Objectives: The insidious presence of free radicals in the human body has become a worrisome concern. These chemical species continue to plague the human cells, tissues and organs resulting in different patho-physiological conditions such as cancers and neurodegenerative disorders like Alzheimer’s disease and Parkinson’s disease amongst many other ailments. The search for novel pharmacological compounds with the aim of checking these radicals led the choice of vanillin in this present study. Methodology: Vanillin was separately subjected to some derivatization reactions namely; acetylation, O-demethylation, reduction and oxidation. The melting points, refractive indices and optical rotations of the lead compound and derivatives were obtained. The antioxidant activities of the five compounds were determined using the DPPH (2, 2-diphenyl-1-picrylhydrazyl hydrate) test. Comparison of the obtained antioxidant activities was done to determine if any improvements could be seen in the derivatives. Results: The identities of the derivatives have been revealed to be vanillyl acetate (E-1), 3, 4-dihydroxy benzaldehyde or protocatechui aldehyde (E-2), o-methoxy-p-methyl cyclohexan-1-ol (J-1) and vanillic acid (J-2) respectively using the IR spectral technique. Vanillin, E-2 and J-2 gave marginal antioxidant activity of IC50 of 0.81, 0.84 and 0.0.85 µg/mL respectively while J-1 and E-1 demonstrated moderately significant IC50 of 0.59 and 0.63 µg/mL which compare favorably with 0.44 µg/mL elicited by Vitamin C (a standard antioxidant drug). It is pertinent to point out that the obtained reduced derivative is a substituted cycloalkanol (a saturated cyclic compound) instead of a substituted phenolic compound as was expected. Conclusion: The results from this study indicate that reduction and acetylation separately enhances the antioxidant activity of vanillin.
Abstract: Background of study: Vanillin is a white monoclinic crystalline compound whose chemical nomenclature is p-hydroxy-m-methoxy benzaldehyde. It is a phenolic aldehyde with a pleasant flavor and popularly found in vanilla beans and roasted coffee amongst many other sources. It possesses antitumor and particularly antioxidant activity which formed the e...
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