Storage and ultraviolet‐induced tissue stress effects on fresh‐cut pineapple

Abstract

The effect of UV-induced stress on the volatile aroma compounds in cut pineapple was compared with that of storage at 4 • C for 24 h. Eighteen volatile compounds were identified by solidphase microextraction (SPME) in fresh-cut pineapple. Methyl-2-methylbutanoate, methyl hexanoate, methyl 5-hexenoate, ethyl hexanoate and ethyl 5-hexenoate were the major aroma compounds. Storage at 4 • C for 24 h, and exposure of cut fruit to UV radiation for 15 min caused a considerable decrease in the concentration of esters and increase in the relative amount of copaene. This sesquiterpene, when added to crushed cantaloupe melon (0.1 mg g −1 ), inhibited microbial growth in the fruit over a period of 24 h at 20 • C. Cis-and trans-ocimene were present in the fruit but their production was not photo-induced by UV irradiation. Ocimene, however, was a potent antimicrobial agent that killed microorganisms when added to the crushed fruit and stored at 20 • C for 24 h. The results indicate that sesquiterpene phytoalexins could contribute to the defense mechanism in wounded pineapple tissue.

UV-B-induced changes of volatile metabolites and phenolic compounds in blueberries (Vaccinium corymbosum L.)

“…Furthermore, Lamikanra and Richard (2004) reported that the UV treatment of fresh cut pineapple caused a considerable decrease in the concentration of esters and an increase in the relative amount of copaene (sesquiterpene). Moreover, the stimulation of terpene biosynthesis by stress e.g.…”

Impact of UV-C light on safety and quality of fresh-cut melon

“…Moreover, such technology has been reported to inactivate oxidative and pectolytic enzymes in fresh-cut apple derivatives . UV-C radiation was also shown to modify the flavour pattern of tropical fruits (Beulieu, 2007;Lamikanra & Richard, 2004) as well as to catalyze the oxidative damage of flavour and pigments (Hashizume, Gordon, & Mottram, 2007;Manzocco, Kravina, Calligaris, & Nicoli, 2008). Thus UV-C treatment potential for commercial use would depend on its ability to sanitize and retard microbial growth without causing undesirable quality changes in the final product (Fonseca & Rushing, 2006).…”

Composition of the Cloacal Gland Secretion of Tuatara, Sphenodon punctatus

“…h) Coinjection of compounds tested in f and g. i) Synthetic methyl (2R,6R)-2,6,10-trimethylundec-9-enoate (51). j) Coinjection of compounds tested in g and i. methyl esters of A and B occur in pineapple [39]. The norterpenoid E has been found in peppermint oil [40], while its unsaturated analog F (with unknown configuration) was found in the skin extracts of the opisthobranch mollusc, Melibe leonina [41], and in the sex-attracting secretion of the dung beetle, Kheper lamarcki [42].…”