Quality of Pleurotus ostreatus mushrooms was compared during cold storage under various temperatures and
modified atmospheres with and without moisture absorbers. CO2 production followed a non-climacteric pattern and
was about 0.50, 0.99 and 1.23 mmol CO2 kg1 s1 at 0, 4 and 7 8C, respectively, after 12 h. At the end of 11 days of
storage, the respiration rates were very similar for all the assayed temperatures (9/0.37 mmol CO2 kg1 s1). The best
mushroom appearance was found at 0 8C, although for optimizing modified atmosphere packaging (MAP), 4 8C was
selected to minimize low-temperature damage. When prolonging the storage beyond 7 days, quality characteristics
dropped sharply and the mushrooms were not marketable, except when kept at 0 8C. Therefore, 7 days was the
maximum recommended storage period for Pleurotus mushrooms. MAP at 4 8C for 7 days was created using
microperforated polypropylenes (MPP1 and MPP2), low-density polyethylene (LDPE) and polyvinyl chloride (PVC)
films. Results were compared with macroperforated polypropylene (PP) control packages. In order to avoid
condensation, sorbitol and silica gel were used to modify the in-package relative humidity. Moisture absorbers did
not modify the gas composition of the packages. Sorbitol promoted tissue leakage and cannot be recommended. Lower
relative humidity was observed in packages containing silica gel and this did not affect the quality of the mushrooms.
However, increasing amounts of silica gel increased weight loss in Pleurotus mushrooms, and high weight loss detected
in PP packages made these unacceptable. MAP (15 kPa O2/5 kPa CO2) was found beneficial for maintaining
acceptable quality of Pleurotus for 7 days at 4 8C.
Quality of Pleurotus ostreatus mushrooms was compared during cold storage under various temperatures andmodified atmospheres with and without moisture absorbers. CO2 production followed a non-climacteric pattern andwas about 0.50, 0.99 and 1.23 mmol CO2 kg1 s1 at 0, 4 and 7 8C, respectively, after 12 h. At the end of 11 days ofstorage, the respiration rates were very similar for all the assayed temperatures (9/0.37 mmol CO2 kg1 s1). The bestmushroom appearance was found at 0 8C, although for optimizing modified atmosphere packaging (MAP), 4 8C wasselected to minimize low-temperature damage. When prolonging the storage beyond 7 days, quality characteristicsdropped sharply and the mushrooms were not marketable, except when kept at 0 8C. Therefore, 7 days was themaximum recommended storage period for Pleurotus mushrooms. MAP at 4 8C for 7 days was created usingmicroperforated polypropylenes (MPP1 and MPP2), low-density polyethylene (LDPE) and polyvinyl chloride (PVC)films. Results were compared with macroperforated polypropylene (PP) control packages. In order to avoidcondensation, sorbitol and silica gel were used to modify the in-package relative humidity. Moisture absorbers didnot modify the gas composition of the packages. Sorbitol promoted tissue leakage and cannot be recommended. Lowerrelative humidity was observed in packages containing silica gel and this did not affect the quality of the mushrooms.However, increasing amounts of silica gel increased weight loss in Pleurotus mushrooms, and high weight loss detectedin PP packages made these unacceptable. MAP (15 kPa O2/5 kPa CO2) was found beneficial for maintainingacceptable quality of Pleurotus for 7 days at 4 8C.
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