Assessment of three green papaya (Carica papaya Linn.) cultivars ('Krang', 'Kaek Noul', and 'Kaek Dum') for use as shredded fruit
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Author list: Chareekhot K., Techavuthiporn C., Wongs-Aree C., Boonyaritthongchai P., Kanlayanarat S.
Publisher: Taylor and Francis Group
Publication year: 2014
Journal: The Journal of Horticultural Science and Biotechnology (1462-0316)
Volume number: 89
Issue number: 3
Start page: 321
End page: 328
Number of pages: 8
ISSN: 1462-0316
eISSN: 2380-4084
Languages: English-Great Britain (EN-GB)
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Abstract
Immature Carica papaya fruit of three cultivars ('Krang', 'Kaek Noul', and 'Kaek Dum') known to be suitable for processing as papaya shreds were harvested 60 - 70 d after anthesis. 'Krang' had the largest fruit among the three cultivars. The mean fruit firmness values for intact 'Krang', 'Kaek Noul', and 'Kaek Dum' papaya fruit were 95.2 N, 99.4 N, and 109.7 N, respectively. The mean rates of respiration and ethylene production in intact fruit were not significantly different among the three cultivars.The flesh of 'Krang' fruit had the highest L* and hue angle (hฐ) values (68.1 and 112.8, respectively), and the flesh of 'Kaek Dum' was more yellow in colour than the flesh of the other two cultivars, expressed as a b* value of 8.9. During storage at 10ฐC and 85 - 90% relative humidity, shreds of 'Kaek Dum' fruit flesh retained the highest average shear force values, followed by 'Kaek Noul' and 'Krang'. Shreds of 'Krang' fruit showed a relatively higher loss of fresh weight than 'Kaek Dum' or 'Kaek Noul' (3.7 - 5.8%, 2.4 - 3.2%, and 1.1 - 2.2%, respectively), and this loss appeared to correlate with the microstructure of the parenchyma cells. The cellular morphology of shredded fruit was observed using a scanning electron microscope (SEM). The SEM revealed that parenchyma cells in 'Krang' were larger than those in 'Kaek Noul' and 'Kaek Dum'. On day-6, fruit flesh shreds of 'Kaek Noul' and 'Kaek Dum' scored higher than those of 'Krang' in a trained, ten-person panel test on a nine-point hedonic scale for overall acceptance, with values of 5.0, 4.3, and 3.6, respectively. 'Kaek Noul' and 'Kaek Dum' papaya fruit were therefore better suited for processing into shreds and had a longer storage-life of 6 d. Although, initially, 'Krang' fruit had the best appearance and a high L* value after peeling, these features were lost during storage at 10ฐC and reduced the storage-life to only 4 d.
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