Articles

Impact of water rinsing and packaging of leafy green vegetables on the development of off-odour and shift in volatile profile

Article number
1194_40
Pages
275 – 282
Language
English
Abstract
Postharvest challenges associated with packaged leafy green vegetables include tissue softening (loss of turgor), accelerated browning of cut edges, and the development of strong off-odours.
This study investigated the effect of water rinsing prior to packaging on the change in volatile distribution and degreening of leafy green vegetables.
Perforation-mediated modified atmosphere packaging (MAP) system was applied using a flow wrap design format (polypropylene film 30 μm thickness) with total package volume of 1.9 L. Number of perforations were MAP-0: without perforation; MAP-2: 2 micro-perforations; and control: 21 macro-perforations industry practice as control.
Packaged samples (125 g) were stored at 4°C, 80% RH for 4 days and thereafter moved to 20°C, 65% RH for 3 days (to mimic the supply chain and retail conditions). Changes in headspace gas composition, sensory attributes and volatile composition were evaluated at regular intervals during the storage period.
Headspace gas composition was significantly influenced by the different packaging systems.
Degreening of samples was delayed under MAP-2; however, this process was enhanced after the break in cold chain.
A total of 35 volatile organic compounds (VOCs) were tentatively identified via gas chromatography-mass spectrometry, consisting of 19 primary (detected on fresh samples prior to storage) and 15 secondary (detected on samples during storage) VOCs.
Volatile profiles obtained were significantly influenced by water rinsing and the packaging system.
Accumulation of secondary VOCs and development of strong off-odour was higher for washed samples in comparison to dry samples.
Perceived development off-odour based on sensory evaluation was observed to be consistent with the accumulation of ethyl esters, benzaldehyde, benzene acetaldehyde, and benzyl alcohol volatile organic compounds.

Publication
Authors
O. Caleb, G. Rux, M. Geyer, W. Herppich, P. Mahajan
Keywords
rucola, volatile sulphur compounds, off-odour, storage quality
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