บทคัดย่องานวิจัย

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Induction of chilling injury in jicama (Pachyrhizus erosus) roots: changes in texture, color and phenolics.

Cantwell, M. I., Peiser, G. and Mercado-Silva, E.

Postharvest Biology and Technology. Volume 25, Number 3, 2002. Pages 311-320.

2002

บทคัดย่อ

Induction of chilling injury in jicama (Pachyrhizus erosus) roots: changes in texture, color and phenolics.

Storage of jicama roots (collected from Nayarit, Mexico) at 10 deg C resulted in characteristic chill-induced changes in pulp colour (decreased L* values and increased chroma) and texture (increased distance to rupture) after 7-14 days. Discoloration or browning of the pulp occurred first in exterior pulp tissue and then progressed to the interior tissue. Changes in texture during storage were similar in exterior and interior pulp tissues. Chill-induced colour changes generally occurred before changes in texture. After 10 deg C storage, transfer to 20 deg C enhanced chill-induced changes in colour, texture, and phenol concentrations. Roots stored at 13 deg C for 6 weeks began to exhibit changes in pulp colour but not in texture. Roots stored at 20 deg C for 6 weeks had no colour or textural changes although they lost about 40% of their fresh weight. Chill-induced browning was associated with increased concentrations of soluble phenolic compounds and increased phenylalanine ammonia lyase activity. Phenolic compounds in chilled jicama root had UV spectra similar to those of catechins, though (+)-catechin and (-)-epicatechin were not present based on HPLC.