Characteristics of Pitaya After Radio Frequency Treating: Structure, Phenolic Compounds, Antioxidant, and Antiproliferative Activity

  • Yingbin Shen
  • Luyao Zheng
  • Min Gou
  • Tianyu Xia
  • Wenhao Li
  • Xun Song
  • Hao JiangEmail author


The performances of radio frequency (RF) heating treatment of pitaya fruits, with varying distances between the electrode plates, were investigated. The data indicated that a large gap between the electrode plates would reduce the highest temperature and the temperature rising rates. Contrarily, Smaller gap between the electrode plates always resulted in non-uniform heating. However, the RF heating treatment method was effective for enzyme inactivation. The results of the antiproliferative activity and cellular antioxidant activity (CAA) assay indicated that the RF heat treatment had limited effects on the functional features of the samples. However, the functional features of the pitaya samples obtained from the 100-mm and 120-mm gap RF heat treatments were better than those of the 140-mm and 160-mm gap RF heat-treated pitaya samples. The results suggested that RF heat treatment is an efficient method for enzyme inactivation.


Radio frequency Pitaya Antioxidant activity Polyphenols 



We appreciated the kind assistance from Prof. Shaojin Wang in Northwest A & F University.

Funding Information

This research was supported by the National Key Research and Development Program of China (2017YFD0400900), the National Natural Science Foundation of China (under Grant No. 31601485), and the Fundamental Research Funds for the Central Universities (Z109021620).

Compliance with Ethical Standards

Conflict of Interest

The authors declare that they have no conflict of interest.


  1. Jiang, H., Zhang, M., Mujumdar, A. S. & Lim, R. (2011). Comparison of the effect of microwave freeze drying and microwave vacuum drying upon the process and quality characteristics of potato⁄banana re-structured chips. International Journal of Food Science and Technology, 46, 570–576.Google Scholar
  2. Link, A., Balaguer, F., & Goel, A. (2010). Cancer chemoprevention by dietary polyphenols: promising role for epigenetics. Biochemical Pharmacology, 80(12), 1771–1792.CrossRefGoogle Scholar
  3. Matan, N., Puangjinda, K., Phothisuwan, S., & Nisoa, M. (2015). Combined antibacterial activity of green tea extract with atmospheric radio-frequency plasma against pathogens on fresh-cut dragon fruit. Food Control, 50(2), 291–296.CrossRefGoogle Scholar
  4. Singleton, V. L., & Rossi, J. A. (1965). Colorimetry of total phenolics with phosphomolybdic-phosphotungstic acid reagents. American Journal of Enology & Viticulture, 16(3), 144–158.Google Scholar
  5. Thana, P., Machmudah, S., Goto, M., Sasaki, M., Pavasant, P., & Shotipruk, A. (2008). Response surface methodology to supercritical carbon dioxide extraction of astaxanthin from Haematococcus pluvialis. Bioresource Technology, 99(8), 3110–3115.CrossRefGoogle Scholar
  6. Wang, Y., Wig, T. D., Tang, J., & Hallberg, L. M. (2003). Dielectric properties of foods relevant to RF and microwave pasteurization and sterilization. Journal of Food Engineering, 57(3), 257–268.CrossRefGoogle Scholar
  7. Wolfe, K. L., & Liu, R. H. (2007). Cellular antioxidant activity (CAA) assay for assessing antioxidants, foods, and dietary supplements. Journal of Agricultural and Food Chemistry, 55(22), 8896–8907.CrossRefGoogle Scholar
  8. Zhang, Y., Hui, Z., Li, W., Guo, X., Qi, X., & Qian, H. (2011). Influence 528 of the degree of hydrolysis (dh) on antioxidant properties and radical-scavenging activities of peanut peptides prepared from fermented peanut meal. European Food Research and Technology, 232(6), 941–950.CrossRefGoogle Scholar
  9. Zhang, S., Zhou, L., Ling, B., & Wang, S. (2016). Dielectric properties of peanut kernels associated with microwave and radio frequency drying. Biosystems Engineering, 145, 108–117.CrossRefGoogle Scholar

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

Authors and Affiliations

  1. 1.School of Life SciencesGuangzhou UniversityGuangzhouChina
  2. 2.Department of Food Science and Engineering, School of Science and EngineeringJinan UniversityGuangzhouChina
  3. 3.College of Food Science and EngineeringNorthwest A&F UniversityYanglingChina
  4. 4.School of Pharmaceutical Sciences, Health Science CenterShenzhen UniversityShenzhenChina

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