Reduced ascorbic acid (RAA) content, total chlorophyll and green color retention, enzyme activities and texture changes were followed in broccoli spears packaged in polymeric film and nonpackaged during 96 hr storage (10°C). Concentrations within packages monitored by gas chromatography were (CO,) 8% and (02) 10%. RAA retention, moisture content, total chlorophyll and color retention were greater in packaged broccoli. No differences were found between packaged and nonpackaged broccoli for ascorbate oxidase and peroxidase activities, or texture.
Ozone exposure was assessed for storage of thomless blackberries which are prone to fungal decay. Blackberries were harvested and stored for 12 days at 2'C in 0.0, 0.1, and 0.3 ppm ozone. Berries were evaluated for ftmgal decay, anthocyanins, color and peroxidase (POD) activity. Ozone storage suppressed fungal development for 12 days, while 20% of control fruits showed decay. The main mold was Botrytis cinereu.Ozone storage did not cause observable injury or defects. By 12 days, anthocyanin content of juice was similar to initial levels for all treatments. Surface color was better retained in 0.1 and 0.3 ppm-stored berries by 5 days and in 0.3 ppm berries by 12 days, by hue angle values. POD was greater in controls and 0.1 ppm samples, and was lowest in 0.3 ppm fruits by 12 days. Ozone storage resulted in market quality extension.
Botrytis-inoculated fruit were treated with three levels of
naturally occurring volatile compounds
in capped bottles and rated for Botrytis development and
evidence of phytotoxicity during 7 days of
storage at 2 °C followed by 3−6 more days at 22 °C for strawberry
and 7 days at 15 °C for blackberry
and grape. Hexanal, 1-hexanol, (E)-2-hexen-1-ol,
(Z)-6-nonenal, (E)-3-nonen-2-one, methyl
salicylate,
and methyl benzoate exhibited potential as postharvest fumigants for
control of Botrytis on
strawberry at the lowest level tested. Ten compounds were
evaluated on blackberry and grape.
None caused phytotoxic responses as with strawberry, while nearly
all of the compounds inhibited
Botrytis at all three test levels. Strawberry,
blackberry, and grape metabolized (E)-2-hexenal
with
reduction of the aldehyde to an alcohol and saturation of the
carbon−carbon double bond adjacent
to the carbonyl, but strawberry yielded more esters as major
products.
Keywords: Fragaria × ananassa; Rubus; Vitis vinifera; metabolism;
antifungal; (E)-2-hexenal
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