Abstract
The free radical scavenging activity and reducing power of 16 phenolic compounds including four hydroxycinnamic acid derivatives namely ferulic acid, caffeic acid, sinapic acid and p-coumaric acid, benzoic acid and its derivatives namely protocatechuic acid, gallic acid and vanillic acid, benzene derivatives namely vanillin, vanillyl alcohol, veratryl alcohol, veratraldehyde, pyrogallol, guaiacol and two synthetic antioxidants, butylated hydroxy anisole (BHA) and propyl gallate were evaluated using 1,1-Diphenyl-2-picrylhydrazyl radical (DPPH•), 2,2′-Azinobis-3- ethylbenzothiazoline-6-sulfonic acid radical (ABTS+•), Hydroxyl radical (•OH) and Superoxide radical (O2 •-) scavenging assays and reduction potential assay. By virtue of their hydrogen donating ability, phenolic compounds with multiple hydroxyl groups such as protocatechuic acid, pyrogallol, caffeic acid, gallic acid and propyl gallate exhibited higher free radical scavenging activity especially against DPPH• and O2 •-. The hydroxylated cinnamates such as ferulic acid and caffeic acid were in general better scavengers than their benzoic acid counter parts such as vanillic acid and protocatechuic acid. All the phenolic compounds tested exhibited more than 85 % scavenging due to the high reactivity of the hydroxyl radical. Phenolic compounds with multiple hydroxyl groups also exhibited high redox potential. Exploring the radical scavenging and reducing properties of antioxidants especially those which are found naturally in plant sources are of great interest due to their protective roles in biological systems.
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Abbreviations
- Prot:
-
Protocatechuic acid
- Guai:
-
Guaiacol
- Caff:
-
Caffeic acid
- Feru:
-
Ferulic acid
- Coum:
-
p-Coumaric acid
- Gall:
-
Gallic acid
- Vaci:
-
Vanillic acid
- Sina:
-
Sinapinic acid
- Prop:
-
Propyl gallate
- Veald:
-
Veratraldehyde
- BHA:
-
Butylated hydroxy anisole
- Veal:
-
Veratryl alcohol
- Valc:
-
Vanillyl Alcohol
- Pyro:
-
Pyrogallol
- Benz:
-
Benzoic acid
- Vani:
-
Vanillin
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Acknowledgments
The authors are thankful to the Director, NIIST (CSIR), India for providing the facilities for carrying out this research work. The first author acknowledges CSIR, India for the Research Fellowship and Universiti Teknologi Malaysia (UTM) for the Postdoctoral Fellowship.
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Mathew, S., Abraham, T.E. & Zakaria, Z.A. Reactivity of phenolic compounds towards free radicals under in vitro conditions. J Food Sci Technol 52, 5790–5798 (2015). https://doi.org/10.1007/s13197-014-1704-0
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DOI: https://doi.org/10.1007/s13197-014-1704-0