Major fungal species that attacked trimmed
sweet corn cobs during storage and shelf life, were
Alternaria alternata (Fr.) Keissler, Fusarium
moniliforme Sheldon, and Mucor hiemalis Wehmer,
in agreement with previous report of Barkai-
Golan (1981). In addition to fungal pathogens,
bacterial and yeast species were also present on
spoiled cobs.
The most severe microbial spoilage was on cobs
sealed in perforated Cryovac SM60M film, either
within nested packages or alone (Fig. 3). Condensed
water accumulated in retail trays packaged
in this perforated polyolefin. The lowest fungal
growth was observed within retail packs made of
the Xtend film. This film treatment also resulted
in the highest CO2 level in the in-package atmosphere
shown in Fig. 2. However, after transfer to
higher temperatures during the shelf life period
the corn in these retail packages developed a
distinct off-odor, reflected in high concentrations
of ethanol and acetaldehyde vapors in the
headspace (Fig. 3). Similar levels of fermentation
volatiles, but more severe decay, were detected in
regular PVC-wrapped trays. It should be noted
that accumulation of ethanol in retail PVCwrapped
trays varied by experiments and, for
example, in the experiment associated with Fig. 1,
was less than half that shown in Fig. 3.
Storage in PVCXtend nested packages allowed
a combination of reduced microbial
spoilage with low accumulation of fermentation
products. The levels of ethanol and acetaldehyde
were significantly lower in nested packages as
compared to the same kinds of retail packages
(PVC or SM60M) used alone (Fig. 3), provided
the liners were open during the shelf life period.
Major fungal species that attacked trimmedsweet corn cobs during storage and shelf life, wereAlternaria alternata (Fr.) Keissler, Fusariummoniliforme Sheldon, and Mucor hiemalis Wehmer,in agreement with previous report of Barkai-Golan (1981). In addition to fungal pathogens,bacterial and yeast species were also present onspoiled cobs.The most severe microbial spoilage was on cobssealed in perforated Cryovac SM60M film, eitherwithin nested packages or alone (Fig. 3). Condensedwater accumulated in retail trays packagedin this perforated polyolefin. The lowest fungalgrowth was observed within retail packs made ofthe Xtend film. This film treatment also resultedin the highest CO2 level in the in-package atmosphereshown in Fig. 2. However, after transfer tohigher temperatures during the shelf life periodthe corn in these retail packages developed adistinct off-odor, reflected in high concentrationsof ethanol and acetaldehyde vapors in theheadspace (Fig. 3). Similar levels of fermentationvolatiles, but more severe decay, were detected inregular PVC-wrapped trays. It should be notedthat accumulation of ethanol in retail PVCwrappedtrays varied by experiments and, forexample, in the experiment associated with Fig. 1,was less than half that shown in Fig. 3.Storage in PVCXtend nested packages alloweda combination of reduced microbialspoilage with low accumulation of fermentationproducts. The levels of ethanol and acetaldehydewere significantly lower in nested packages as
compared to the same kinds of retail packages
(PVC or SM60M) used alone (Fig. 3), provided
the liners were open during the shelf life period.
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