The effects of prestorage short-term Anoxia treatment combined with modified atmosphere packaging(MAP) on quality changes during the storage of green asparagus (Asparagus officinalis L.) spears wereinvestigated. Two sets of asparagus were used in this study. Thefirst set underwent short-term Anoxiatreatment via the administration of gaseous N2 for 8 h at room temperature, while the second set waskept in ambient air at the same temperature. Consequently, treated and untreated spears were storedeither freely or packaged in plastic bags with low density polyethylene, in which a passive modification ofthe atmosphere was allowed to develop. All samples were stored at 4 C for 8 days, followed by 8 days at10 C. Samples treated with neither Anoxia nor MAP were used as a control. Our results show that treatingthe asparagus samples with Anoxia and MAP (Anoxia + PE) caused lower respiration, slowing thedecrease in headspace O2. In the Anoxia + PE treated samples, spears lost <12% fresh weight after 8 daysat 10 C. All treatments showed less increase in shear force while exposed at 4 C for 8 days, as comparedwith the significant increase found when transferred to 10 C. This increase in shear force wasaccompanied by the accumulation offiber and lignin content. There was a positive relationship betweentoughening andfiber (R2 = 0.958) and toughening and lignin (R2 = 0.915). Moreover, the degradation ofchlorophyll, sugar and ascorbic acid content under the Anoxia and MAP treatments were significantly
reduced. The results of the present work indicate that Anoxia treatment, a non-chemical and simple
postharvest technology, feasible for use in developing countries where food storage technologies are
lacking.
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