Fruits, The International Journal of Tropical and Subtropical Horticulture

Fruits 76 (2) 72-79 | DOI: 10.17660/th2021/76.2.3
ISSN 0248-1294 print and 1625-967X online | © ISHS 2021 | Fruits, The International Journal of Tropical and Subtropical Horticulture | Original article

Electrostatic atomized water particles delay postharvest senescence of 'Namwa' banana (Musa × paradisiaca)

N. Salaemae¹, N. Pongprasert¹, P. Boonyaritthongchai¹, C. Wongs-Aree¹, S. Kaewsuksaeng², M. Shigyo³, N. Yamauchi³ and V. Srilaong^1,a
¹ Postharvest Technology Program, School of Bioresources and Technology, King Mongkut's University of Technology Thonburi, Bangkok 10140, Thailand
² Department of Plant Science, Faculty of Technology and Community Development, Thaksin University, Phatthalung Campus, Phatthalung 93210, Thailand
³ Graduate School of Science and Technology for Innovation, Yamaguchi University, Yoshida, Yamaguchi 753-8515, Japan

SUMMARY
Introduction – ‘Namwa’ is one of Thai native banana cultivars. It showed a rapid ripening which leads to senescence-associated peel blackening during the postharvest period. Thus, the effect of electrostatic atomized water particles (EAWPs) on the postharvest quality and senescence of ‘Namwa’ banana was assessed. Materials and methods – Fruit samples were pretreated with EAWPs for 0 (control), 0.5, 1.0, 1.5 and 3 h. After the treatment, the fruits were kept in polypropylene bags with two 5-mm holes and stored at ambient temperature (25±2 °C) under dark conditions. Results and discussion – The 1-h EAWPs treatment performed best at delaying ripening, reducing weight loss, and retarding peel color change, especially the Hue angle and L* value, in ‘Namwa’ banana during storage. It also efficiently delayed the reduction of Chlorophyll a and b contents. Interestingly, EAWPs treated samples showed higher hydrogen peroxide (H₂O₂) content in peel tissues just after treatment and decreased afterward to a level lower than the control. Moreover, treatment with EAWPs resulted in higher total phenolic content in peel tissues and lower polyphenol oxidase (PPO) and peroxidase (POD) activities associated with lesser peel blackening. Conclusion – The EAWPs treatment maintained postharvest quality of ‘Namwa’ banana through delayed ripening and senescence-associated peel blackening.
Keywords ripening, peel blackening, Nanoe air purifier, reactive oxygen species

Significance of this study
What is already known on this subject?

‘Namwa’ banana is one of the popular native banana cultivars in Thailand, commonly used and consumed locally due to its very high nutrition value. A major postharvest problem of ‘Namwa’ banana is rapid ripening, peel blackening, decay, and short shelf life. This leads to limitations for export.
What are the new findings?

EAWPs treatment delayed ripening and senescence-associated peel blackening of ‘Namwa’ banana. In addition, EAWPs reduced enzymatic browning reaction via reducing of polyphenol oxidase and peroxidase activities in the peel of ‘Namwa’ banana. Additionally, EAWPs treatment maintained total phenolics content during storage.
What is the expected impact on horticulture?

The effectiveness of applying EAWPs will maintain postharvest quality and extend storage life, and will promote the export of ‘Namwa’ banana. EAWPs treatment is classified as physical treatment which can apply with other fresh bananas.

E-mail: varit.sri@mail.kmutt.ac.th

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Received: 20 September 2020 | Accepted: 22 November 2020 | Published: 30 March 2021 | Available online: 30 March 2021