Articles

Postharvest treatments to improve quality and safety of locally-grown vegetables stored at non-optimum temperatures

Article number
1194_190
Pages
1353 – 1360
Language
English
Abstract
Access to cold storage is limited for vegetable growers in Kansas and recent survey data indicate that 32% have access to cooling facilities with 6% having access to refrigerated trucks.
This is a significant barrier for vegetable growers that wish to reach wholesale markets.
Modified atmosphere packaging (MAP) is a technique that could supplement refrigeration.
The objective of this project was to investigate the effects of passive MAP, and of washing with ozonated water on the quality, safety and storage life of vegetables stored at non-optimum temperatures.
Spinach, asparagus, and broccoli were purchased from local farms and six treatments were evaluated from combining unwashed, washed with cold water (4°C) and washed with ozonated water, with the two package types: produce bags, normally found in the supermarket, and passive MAP bags.
Samples were stored at 13°C and 85% RH. CO2 and O2 concentrations were monitored daily.
Every three days, samples were evaluated for visual quality and decay as well microbiological growth.
MAP bags equilibrated at an atmosphere of 7% CO2 and 4-6% O2; 3.5% CO2 and 8% O2 and 12% CO2 and 3% O2 for spinach, asparagus and broccoli, respectively.
Treatments had no effect on the microbiological growth.
The utilization of passive MAP allowed to increase in five and six days the shelf life of spinach and broccoli stored at 13°C, respectively, regardless the type of washing.
MAP did not affect the shelf life of asparagus.
Passive MAP can be an alternative to extend the shelf of spinach and broccoli life when it is not possible to use the refrigeration.

Publication
Authors
H.P. Chiebao, J.R. Jenott, D.A. Unruh, S.E. Gragg, C.L. Rivard, E.D. Pliakoni
Keywords
asparagus, broccoli, spinach, modified atmosphere packaging, ozonated water
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