Abstract
The antioxidant components of cocoa powder, which is rich in polyphenols, were isolated using column chromatography and high performance liquid chromatography. Polyphenolic compounds were then characterized by high-performance liquid chromatography/Ultraviolet and electronspray ionization—tandem mass spectrometry (HPLC-UV-/ESI-MS-MS). As a result, five phenolic compounds were detected. In this study we also investigated scavenging or the total antioxidant capacity (%) of cocoa polyphenol (CP) fractionated from cocoa powder extract. 114.0 mg/g of gallic acid –equivalent phenolics and 94.3 mg/g catechin- equivalent flavonoids were quantified in this extract. Their free radical-scavenging activity was assessed by 1,1-diphenyl-2-picrylhydrazyl radical (DPPH) assay, β-carotene bleaching test, and xanthine oxidase inhibitory activity (OX). Total antioxidant capacity (TAC) was further assessed against the myoglobin-induced oxidation of 6-hydroxy-2, 5, 7, 8-tetramethylchroman-2-carboxylic acid (ABTS) and expressed as Trolox equivalent. A high correlation between TAC and phenolic contents indicated that phenolic compounds from cocoa were a major contributor of antioxidant activity (0.967 ≤ r ≤ 1.00). CP extract had significantly (P < 0.05) potential antioxidant activities with various concentrations. These results suggest that Polyphenols-rich cocoa extract possess prominent medical properties and can be exploited as natural drug to treat free radical associated diseases.
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Abbreviations
- HPLC-UV-/ESI-MS-MS:
-
High-performance liquid chromatography/Ultraviolet and electronspray ionization—tandem mass spectrometry
- BHT:
-
Butylated hydroxytoluene
- DPPH:
-
2,2-diphenyl-1-picrylhydrazyl
- ABTS:
-
2,2′-azino-di(3-ethylbenzthiazoline-6-sulfonic acid
- ABTS•+:
-
ABTS cation radical
- TAC:
-
Total antioxidant capacity
- Trolox:
-
6-Hydroxy-2,5,7,8-tetramethylchroman-2-carboxylic acid
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Acknowledgments
This work was supported by (Research Grant Number: 9315900). The authors would like to acknowledge Faculty of Medicine and Health sciences for the use of laboratory facilities and financial support. Syed Hasbulla is acknowledged for technical help in HPLC-UV. The technicians in Food science and technology laboratory are acknowledged for their technical assistance in LC-MS-MS. Also, we remain thankful to IBS for libraries information of phenolic compounds.
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The authors have no competing interests to disclose.
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Faisal Ali and Yazan Ranneh contributed equally to this work and therefore, share the first authorship.
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Ali, F., Ranneh, Y., Ismail, A. et al. Identification of phenolic compounds in polyphenols-rich extract of Malaysian cocoa powder using the HPLC-UV-ESI—MS/MS and probing their antioxidant properties. J Food Sci Technol 52, 2103–2111 (2015). https://doi.org/10.1007/s13197-013-1187-4
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DOI: https://doi.org/10.1007/s13197-013-1187-4