.gamma. Irradiation of subtropical fruits. 2. Volatile components, lipids and amino acids of mango, papaya, and strawberry pulp

Blakesley, C. Newton; Loots, Johan G.; Plessis, Lourens Du; Bruyn, Gerrit De

doi:10.1021/jf60221a038

Cited by 15 publications

(2 citation statements)

References 5 publications

(7 reference statements)

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“…Much of the studies on ionizing radiation of fruits and vegetables have been done with the use of gamma radiation (Blakesley et al. 1979; Beyers et al.…”

Section: Introductionmentioning

confidence: 99%

OPTIMIZING ELECTRON BEAM IRRADIATION OF “TOMMY ATKINS” MANGOES (MANGIFERA INDICA L.)

Moreno¹,

Castell‐Perez²,

Gomes³

et al. 2007

J Food Process Engineering

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“…Much of the studies on ionizing radiation of fruits and vegetables have been done with the use of gamma radiation (Blakesley et al. 1979; Beyers et al.…”

Section: Introductionmentioning

confidence: 99%

OPTIMIZING ELECTRON BEAM IRRADIATION OF “TOMMY ATKINS” MANGOES (MANGIFERA INDICA L.)

Moreno¹,

Castell‐Perez²,

Gomes³

et al. 2007

J Food Process Engineering

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“…Nonetheless, the effects of irradiation on aroma volatiles have been studied on only a few mango cultivars (Blakesley et al, 1979;Gholap et al, 1990;Laohakunjit et al, 2006). Irradiation of 'Alphonso' mangoes at 0.25 kGy and 'Kent' mango fruit at 0.75 kGy did not affect the aroma volatile profile (Blakesley et al, 1979;Gholap et al, 1990).…”

Section: Introductionmentioning

confidence: 99%

Lenticel discolouration, under-skin browning and resin canal disorder in Australian mango fruit cultivars

San¹

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Lenticel discolouration (LD), under-skin browning (USB), and resin canal disorder (RCD) are three fruit skin disorders of concern to the Australian mango industry. LD is confined to lenticels on the fruit skin. It was suspected that irradiation may differentially induce LD on cvs. 'B74', 'Honey Gold', 'Kensington Pride', and 'R2E2' fruit. Irradiation at 0.5 kGy significantly (P≤0.05) increased LD and delayed the loss of green skin colour of all four cultivars. There was generally no significant differences (P>0.05) between 0.5 ('commercial' dose) and 1.0 kGy ('upper limit' dose).The least pronounced effect was on cv. 'Honey Gold'. Irradiation also diminished aroma volatiles production by cvs. 'Kensington Pride' and 'R2E2'. Examination of the morphology of LD showed it in tissue sections as browning of sub-lenticellular cells around lenticel cavities. No such browning was evident in sub-lenticellular cells around non-coloured lenticel cavities. Coloured polymerised phenolic compounds appeared accumulate in the cell wall and in the cytoplasm of sub-lenticellular cells around the cavities of discoloured lenticels.USB is a physiological disorder evident as spreading grey -brown sub-surface lesions in cv. 'Honey Gold' mango fruit. In contrast, RCD in cv. 'Kensington Pride' mango fruit is evident as ramifying dark brown sub-surface resin canals. These two largely cv. specific browning disorders were compared and contrasted at the cellular level. USB was characterised by dark brown surrounding parenchyma cells around the epithelial cells that line resin ducts. This disorder involves starch retention as well as deposition of phenolic compounds in parenchyma cells surrounding the epithelial cells of resin ducts. In contrast, RCD was distinguished by localised browning inside resin duct lumens. The browning process evidently involved accumulation of polymerised phenolics.Polyphenol oxidase and peroxidase enzymes were determined by tissue printing to be associated with both USB and RCD browning.The effect of harvest time over the diurnal cycle was investigated with regard to the propensity of cv. 'Honey Gold' fruit to develop USB. USB expressed in postharvest is related to the cumulative interaction of physical (viz., vibration) and physiological (viz., chilling) stresses. Fruit harvested during the day were relatively more susceptible to developing USB than were those picked at night.The higher USB incidence in the afternoon harvest was related to temporally variable sap phytoxicity. An important contributory factor to greater afternoon sap phytoxicity was concomit ant increases in the concentrations of volatiles in the sap and, especially, in the non-aqueous sap phase.Changing from day to night and early morning harvesting afforded reduced incidence and severity of USB on cv. 'Honey Gold' fruit. v Li, G.Q., Gupta, M ., San, A.T., Joyce, D.C., Hofman, P.J., M acnish, A.J., M arques, J., 2016.Postharvest treatment effects on 'B74' mango fruit lenticel discolouration after irradiation. Acta Horticulturae (ISHS) 1111...

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Tropical Fruits

Sidhu¹

2006

Handbook of Fruits and Fruit Processing

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.gamma. Irradiation of subtropical fruits. 2. Volatile components, lipids and amino acids of mango, papaya, and strawberry pulp

Cited by 15 publications

References 5 publications

OPTIMIZING ELECTRON BEAM IRRADIATION OF “TOMMY ATKINS” MANGOES (MANGIFERA INDICA L.)

OPTIMIZING ELECTRON BEAM IRRADIATION OF “TOMMY ATKINS” MANGOES (MANGIFERA INDICA L.)

Lenticel discolouration, under-skin browning and resin canal disorder in Australian mango fruit cultivars

Tropical Fruits

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