Liquid Chromatography-Mass Spectrometric Analyses of Potential Antioxidant Constituents from Zanthoxylum zanthoxyloides Leaves: Probing into the Role of Alkaloids

doi.org/10.26538/tjnpr/v4i10.26

Authors

  • Thecla O. Ayoka Department of Science Laboratory Technology (Biochemistry Unit), Faculty of Physical Science, University of Nigeria, Nsukka, Nigeria
  • Ngwu Nwachukwun Department of Biochemistry, School of Biological Sciences, Federal University of Technology, Owerri, Nigeria
  • Aloysius C. Ene Department of Biochemistry, School of Biological Sciences, Federal University of Technology, Owerri, Nigeria
  • Chidi U. Igwe Department of Biochemistry, School of Biological Sciences, Federal University of Technology, Owerri, Nigeria
  • Charles O. Nnadi Department of Pharmaceutical and Medicinal Chemistry, Faculty of Pharmacy, University of Nigeria, Nsukka, Nigeria

Keywords:

Radical scavenging activity, Liquid Chromatography-mass spectrometry, Dereplication, Phytochemical, Antioxidant, Zanthoxylum zanthoxyloides

Abstract

Zanthoxylum zanthoxyloides is a plant used traditionally as food and in medicine, with known antioxidant properties. The study aimed to prepare n-butanol fractions of Z. zanthoxyloides leaves and evaluate their in-vitro antioxidant potential. Vacuum liquid chromatography (VLC) was used to separate the constituents of the n-butanol fraction using gradients of binary mixtures of dichloromethane in methanol (1L) sequentially in the ratios; 9:1 (BF1), 7:3 (BF2), 5:5 (BF3), 3:7 (BF4), and 1:9 (BF5). Three standard antioxidant assay models were adopted for the in-vitro antioxidant activity. Ascorbic acid (53.60%) exhibited superior antioxidant activity relative to the n-butanol sub-fractions; (BF1 14.51%, BF2 24.76%, BF3 10.90%, BF4 6.19% and BF5 23.38%). Meanwhile, BF3 displayed superior reducing potential relative to ascorbic acid using both the TAC and FRAP method (TAC 2.320 ± 0.002; FRAP 2.27 ± 0.002 versus TAC 0.298 ± 0.000; FRAP 0.274 ± 0.002). BF1, BF2, BF4 and BF5 displayed lower reducing potential: TAC 0.202 ± 0.001; FRAP 0.199 ± 0.000, TAC 0.162 ± 0.001; FRAP 0.153 ± 0.001, TAC 0.186 ± 0.002; FRAP 0.174 ± 0.002 and TAC 0.262 ± 0.000; FRAP 0.223 ± 0.003, respectively when compared to ascorbic acid. Several known potential antioxidants were tentatively characterized in the n-butanol sub-fractions by liquid chromatography-mass spectrometry (LC-MS) dereplication. However, a significant number of alkaloids and phenolic compounds unknown for any role in radical scavenging activity (RSA) were detected in n-butanol sub-fractions. Our findings also further probed the possible role of alkaloids in antioxidant cascade.

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Published

2020-10-01

How to Cite

Ayoka, T. O., Nwachukwun, N., Ene, A. C., Igwe, C. U., & Nnadi, C. O. (2020). Liquid Chromatography-Mass Spectrometric Analyses of Potential Antioxidant Constituents from Zanthoxylum zanthoxyloides Leaves: Probing into the Role of Alkaloids: doi.org/10.26538/tjnpr/v4i10.26. Tropical Journal of Natural Product Research (TJNPR), 4(10), 817–823. Retrieved from https://www.tjnpr.org/index.php/home/article/view/1085