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Journal of Food Measurement and Characterization

, Volume 13, Issue 4, pp 3221–3229 | Cite as

Antimicrobial and antioxidant activities of different extracts of the peel of kumquat (Citrus japonica Thunb)

  • Mahmoud A. Al-Saman
  • Asmaa AbdellaEmail author
  • Khaled E. Mazrou
  • Ahmed A. Tayel
  • Sibel Irmak
Original Paper
  • 118 Downloads

Abstract

The objective of this work was to study the bioactive properties of kumquat fruit (Citrus japonica thumb)peel. The mineral composition (ICP-MS), phenolic and flavonoid contents (HPLC), volatiles (GC–MS), antioxidant activity (DPPH) and antimicrobial activity of kumquat peel were determined. Kumquat peel was found to be a good supplement of K, Mg, Ca and Na. The major phenolic acids found were p-hydroxybenzoic acid that followed by vanillic, protocatechuic, chlorogenic and sinapic acids, respectively. The extract contained also apigenin 7-glucosideflavonoid. The volatiles oil analysis showed that kumquat peel essential oil was rich in monoterpenoid limonene (96.33%). The oil was also composed of considerable amount of d-germacrene, α-myrecene, and α-pinene and minor amount of bicyclogermacrene and sabinene. The highest antioxidant activity was obtained using 70% ethanol extract (55.47%), while the least one was observed with n-hexane (27.05%). The antioxidant activity of kumquat extract increased from (21.31%) when the extract concentration was (63 µg/100 µl) to (64.98%) with concentration of (1000 µg/100 µl). Regarding the antimicrobial activity, the highest zone of inhibition (16.58 mm) was recorded with 70% ethanol extract, while the least zone of inhibition (8.98 mm) was found with acetone extract. Staphylococcus aureus was the most sensitive organism with the highest zone of inhibition (16.70 mm) and Escherichia coli was the most resistant organism with the least zone of inhibition (11.30 mm). The present study reviewed antioxidant and antimicrobial activity of different extracts of kumquat peel and concluded that kumquat peel might be used as a natural bioactive source, mainly in the food and pharmaceutical industries.

Keywords

Kumquat Peel Volatiles Flavonoids Antioxidant Antimicrobial Mineral Phenolics 

Notes

Funding

The author(s) received no financial support for the research, authorship, and/or publication of this article.

Compliance with ethical standards

Conflict of interest

The authors declared that they have no conflict of interest.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of Industrial Biotechnology, Genetic Engineering and Biotechnology Research InstituteUniversity of Sadat CitySadat CityEgypt
  2. 2.Department of Plant Biotechnology, Genetic Engineering and Biotechnology Research InstituteUniversity of Sadat CitySadat CityEgypt
  3. 3.Faculty of Aquatic and Fisheries SciencesKafrelsheikh UniversityKafr El-ShaikhEgypt
  4. 4.Department of Biological Systems Engineering, College of Engineering, Industrial Agricultural Products CenterUniversity of Nebraska–LincolnLincolnUSA

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