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Effect of multi-frequency multi-mode ultrasound washing treatments on physicochemical, antioxidant potential and microbial quality of tomato

  • Evans Adingba Alenyorege
  • Haile MaEmail author
  • Ishmael Ayim
  • Joshua Harrington Aheto
  • Chen Hong
  • Cunshan Zhou
Original Paper
  • 91 Downloads

Abstract

The study investigated the effect of multi-frequency ultrasound treatments including mono-frequency ultrasound (MFU), dual-frequency ultrasound (DFU), and tri-frequency ultrasound (TFU) on the physicochemical, antioxidant potential and microbial quality of tomatoes. The results revealed that various frequencies and modes presented significant (P < 0.05) differences in measured parameters including total soluble solids, colour, texture, lycopene content, total phenolic content, 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging activity, microstructure, pigment reflectance and microbial inactivation. However, ultrasound treatments did not significantly affect the pH and titratable acidity of the tomato. The TFU treatment led to a higher retention of total soluble solids, tomato colour indices, total phenolic content and 2,2-diphenyl-1-picrylhydrazyl radical scavenging activity of the sample, with a significant reduction in natural microbiota. The best treatment for natural microbiota reduction and enhancement of microbial safety was TFU, which in general reduced in decimal terms > 1.5 log CFU/g of bacteria, yeast and molds. In general, lycopene content, total colour difference, pigment reflectance, texture, microstructural integrity, and microbial load of tomato decreased in the order of MFU > DFU > TFU due to the increasing cavitation and possible additive effect of multi-frequency ultrasound. Results of the investigation recommend that multi-frequency multi-mode ultrasound washing could retain the quality of tomato. It could effectively be employed for postharvest processing of tomato leading to improvement in physicochemical, antioxidant potential and microbial safety.

Keywords

Multi-frequency ultrasound Physicochemical Microbial safety Antioxidants Tomato 

Notes

Acknowledgements

This study was supported by the National Key Research and Development Programme [2018YFD0700101] and Jiangsu Provincial Special Fund for the Transformation of Scientific and Technological Achievements [BA2016169].

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • Evans Adingba Alenyorege
    • 1
    • 2
  • Haile Ma
    • 1
    • 3
    Email author
  • Ishmael Ayim
    • 1
    • 4
  • Joshua Harrington Aheto
    • 1
  • Chen Hong
    • 1
  • Cunshan Zhou
    • 1
  1. 1.School of Food and Biological EngineeringJiangsu UniversityZhenjiangPeople’s Republic of China
  2. 2.Faculty of AgricultureUniversity for Development StudiesTamaleGhana
  3. 3.Technology Integration Base for Vegetable Dehydration Processing, Ministry of AgricultureJiangsu UniversityZhenjiangPeople’s Republic of China
  4. 4.Faculty of Applied ScienceKumasi Technical UniversityKumasiGhana

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