Conservation of crisp lettuce in different post-harvest storage conditions

ABSTRACT The objective of this work was to evaluate the post-harvest quality and the final storage time of the hydroponic crisp lettuce ‘Brida’, conditioned in different types of plastic packaging and environments. The statistical design was a completely randomized 3x2 factorial design, with 3 types of packages (control (without plastic packaging), perforated plastic packaging and closed plastic packaging) and 2 types of environments refrigerated (± 5 °C) and non-refrigerated (± 23 °C). Fresh leaf weight loss, relative SPAD content, total soluble solids content (TSS), pH, total titratable acidity (TTA), chlorophyll a and b, carotenoids and final storage time were measured. There was a decrease in the parameters of fresh mass, acidity, total soluble solids, and relative content of SPAD chlorophyll in refrigerated lettuce compared to uncooled. The use of packages also influenced post-harvest quality and closed packs resulted in lower values. It is concluded that the post-harvest quality of lettuce is better when they are refrigerated and packed in sealed packages.

摘要 本研究旨在评估经不同塑料包装处理并置于不同贮藏环境下的水培脆叶生菜‘Brida’的采后品质与最终贮藏时长。试验采用完全随机3×2因子设计，设置3种包装处理（对照组：无塑料包装、打孔塑料包装、密闭塑料包装）以及2种贮藏环境（冷藏环境：±5℃、非冷藏环境：±23℃）。测定指标包括鲜叶重量损失率、SPAD相对含量、总可溶性固形物（Total Soluble Solids, TSS）含量、pH值、总可滴定酸度（Total Titratable Acidity, TTA）、叶绿素a、叶绿素b、类胡萝卜素含量及最终贮藏时长。结果显示，与非冷藏组相比，冷藏生菜的鲜重、酸度、总可溶性固形物及SPAD叶绿素相对含量等指标均出现下降；包装方式同样对采后品质产生显著影响，密闭包装组的相关指标更低。综上，当采用冷藏配合密闭包装的贮藏方式时，生菜的采后品质更佳。