Effect of ethylene concentrations on the quality and enzyme activity of Dragon Fruit (Hylocereus Undatus)

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Publication Details

Author list: Nguyen T.D., Mongkolchaiyaphruek A., Srilaong V., Tongchitpakdee S.

Publisher: Codon Publications

Publication year: 2018

Volume number: 30

Issue number: 5

Start page: 77

End page: 81

Number of pages: 5

ISSN: 1120-1770

eISSN: 1120-1770

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85049314382&partnerID=40&md5=4fdd3be2f2840a3c68431f5087988234

Languages: English-Great Britain (EN-GB)

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Abstract

Dragon fruit (Hylocereus undatus) is one of the important tropical fruits in many countries such as Vietnam, Thailand, and Malaysia. Postharvest life of dragon fruits is usually limited by yellowing and bract wilting. Exposure to ethylene during mix load transportation may hasten senescence of dragon fruits. The objective of this research was to study the effect of ethylene on the quality and enzyme activity of dragon fruit. Dragon fruits harvested at 30-34 days after anthesis were dipped in ethephon at concentrations of 0, 100, 200, 400 and 800 ppm for 2 min, and stored at room temperature (27±2°C) for 8 days. Color (L∗, a∗, and b∗), texture (compression test), total soluble solids (refractometer), respiration rate and ethylene production (gas chromatograph TCD and FID, respectively), peroxidase (POD), and phenylalanine ammonia-lyase (PAL) activities, phenolic content, and reducing sugar content (spectrophotometer) of samples were determined during storage. On day 4 and day 6 of storage, total color difference (rE) of fruit peel increased as ethylene concentration. The results showed that firmness of fruit pulp significantly decreased as the concentration of ethylene increased. Generally, respiration rate of dragon fruits increased with storage time and decreased after 6 days of storage. The results also showed that ethylene treatment had no significant effect on ethylene production of dragon fruits (p≥0.05). POD and PAL activities of dragon fruits in all treatments were significantly increased after storage. Ethylene treatment (100-800 ppm) had significant effect on color, firmness, respiration rate, and enzyme activity when compared to control. © 2018 Chiriotti Editori. All rights reserved.

Keywords

Postharvest life