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E-sensing, calibrated PSL, and improved ESR techniques discriminate irradiated fresh grapefruits and lemons

  • Yunhee Jo
  • Kashif Ameer
  • Namhyeok Chung
  • Yoon-Han Kang
  • Dong U. Ahn
  • Joong-Ho KwonEmail author
Original Article
  • 8 Downloads

Abstract

Grapefruit and lemon were exposed to phytosanitary irradiation doses of 0, 0.4, and 1 kGy, and then electronic-sensing screening of irradiation status and identification of radiation-induced ESR markers were conducted during 20 days storage. Codex standard photostimulated luminescence measurement (PSL1) was not a reliable indicator of irradiation status. Electronic tongue and electronic nose, however, showed potential as screening tools for discriminating irradiated fruits from non-irradiated counterparts based on principal component analysis of taste attributes and flavor patterns. Calibrated PSL approach clearly distinguished irradiated from non-irradiated samples based on the PSL ratio (PSL2/PSL1). Verification of irradiation status by electron spin resonance spectroscopy revealed clear paramagnetic centers from both irradiated fruits samples and ethanol-vacuum drying pretreatment improved radiation-induced ESR signal detection; not prominent enough in 0.4 kGy-irradiated commodities during 20 days of storage. Peel parts of both fruits showed high limonene which proportionally increased with irradiation doses (p < 0.05 kGy).

Keywords

Citrus Phytosanitary irradiation Detection Electronic sensing Volatiles 

Notes

Acknowledgements

This research was supported by Kyungpook National University Research Fund, 2016.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Association of Food Scientists & Technologists (India) 2019

Authors and Affiliations

  1. 1.School of Food Science and BiotechnologyKyungpook National UniversityDaeguSouth Korea
  2. 2.Health Research DepartmentHealth and Environment Institute of DaeguDaeguSouth Korea
  3. 3.Institute of Food and Nutritional SciencesPMAS-Arid Agriculture UniversityRawalpindiPakistan
  4. 4.Department of Food Processing and DistributionGangneung-Wonju National UniversityWonju-siSouth Korea
  5. 5.Department of Animal ScienceIowa State UniversityAmesUSA

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