Antioxidant, antimicrobial, and antiproliferative activitybased comparative study of peel and flesh polyphenols from Actinidia chinensis

  • Aamina Alim
  • Ting LI
  • Tanzeela Nisar
  • Daoyuan Ren
  • Xichuan Zhai
  • Yaxing Pang
  • Xingbin Yang
Keywords: Kiwifruit peel, Kiwifruit flesh, Polyphenols, Antioxidant, Antimicrobial, Antiproliferative activity.

Abstract

Background: Kiwifruit (Actinidia chinensis) peel has been always considered as useless because of the harsh taste. To promote the full utilization of kiwifruit resources it is essential to explore the nutritional benefits of kiwifruit peel.

Objective: Our studies explored the difference in polyphenolic composition and biological activity including antioxidant, antimicrobial, and antiproliferative activity of the flesh and peel of kiwifruit.

Design: Antioxidant activity of the extracted polyphenols of the peel and flesh of A. chinensis was checked by 2,2-diphenyl-1-picrylhydrazyl, 2,2’-azino-bis3-ethylbenzothiazoline-6-sulphonic acid (ABTS), hydroxyl ion reduction, and ion chelating ability. Antibacterial activity against Escherichia coli, Listeria monocytogenes, and Staphylococcus aureus and antiproliferative activity against HepG2 was tested in a dose- and time-dependent manner. Liquid chromatography/mass spectrometry (LC/MS) chromatogram of the peel and flesh further differentiated the phenolic acid profile.

Results: The pericarp of kiwifruit was found to be more abundant in polyphenols and flavonoids than the flesh, with contents of 12.8 mg/g and 2.7 mg/g, respectively. LC/MS analysis revealed that the catachin, quercetin and epigallocatechin content (the main polyphenols in kiwifruit) in the peel was significantly higher than in the flesh (P < 0.05). The antioxidant and antibacterial activity of the peel was significantly higher when compared to the flesh. Moreover, the proliferation of HepG2 cells was time- and dose-dependently inhibited by kiwifruit polyphenols, with IC50 values of 170 μg/mL and 291 μg/mL for peel and flesh polyphenols after 72 h of treatment time, respectively.

Conclusion: Kiwifruit peel, with higher content of phenolics and flavonoids, exerts more potent antioxidant, antibacterial, and anticancer activity than the flesh. Our study provides scientific evidence for the development of kiwifruit, especially peel-based, novel natural products with excellent bioactivity.

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Published
2019-04-26
How to Cite
Alim A., LI T., Nisar T., Ren D., Zhai X., Pang Y., & Yang X. (2019). Antioxidant, antimicrobial, and antiproliferative activitybased comparative study of peel and flesh polyphenols from <em>Actinidia chinensis</em&gt;. Food & Nutrition Research, 63. https://doi.org/10.29219/fnr.v63.1577
Section
Original Articles