Postharvest and Refrigeration Group, Department of Food Engineering, Technical University of Cartagena, P. Alfonso XIII 48, 30203 Cartagena, Murcia, Spain.
J Sci Food Agric. 2010 Apr 30;90(6):1089-97. doi: 10.1002/jsfa.3926.
Alternative techniques for cultivation of leafy vegetables such as a floating tray system and unconventional gas mixtures for post-harvest active modified atmosphere packaging (MAP) could be of interest in the minimally processed vegetable industry.
The combined effect of three pre-harvest fertilisation doses (8, 12 or 16 mmol N L(-1)) and three post-harvest MAP conditions (passive, super-atmospheric or N2O-enriched) on the main quality attributes of fresh-cut baby spinach leaves throughout 10 days at 5 degrees C was studied. After 8 days of shelf life, spinach leaves fertilised with 8 and 16 mmol N L(-1) and stored under N2O-enriched MAP showed the lowest microbial growth, with good sensory quality. Such combined treatments also preserved the total antioxidant capacity sampled at harvest (8 g ascorbic acid equivalent antioxidant capacity kg(-1) f.w.). A decrease of 10-20% in total vitamin C content regardless of N fertilisation and packaging treatment was found during shelf life. Total phenolics content at harvest was 2 g gallic acid equivalents kg(-1) f.w., which was slightly decreased or preserved during shelf life while total chlorophylls were preserved for all treatments assayed around 550 mg kg(-1) f.w.
No clear effect of fertilisation doses was observed during post-harvest storage on overall quality of fresh-cut baby spinach leaves, while N2O-enriched atmospheres seems to be a promising alternative to passive MAP for extending shelf life.
对于叶菜类蔬菜的种植，例如漂浮托盘系统和非传统气体混合物，用于收获后的主动改良气氛包装（MAP），可能在最小加工蔬菜行业中具有吸引力。
研究了三种收获前施肥量（8、12 或 16 mmol N L（-1））和三种收获后 MAP 条件（被动、超大气或 N2O 富集）对新鲜切割婴儿菠菜叶的主要质量属性的综合影响在 5°C 下持续 10 天。在货架寿命 8 天后，用 8 和 16 mmol N L（-1）施肥并在 N2O 富集 MAP 下储存的菠菜叶显示出最低的微生物生长，具有良好的感官质量。这种组合处理还保留了收获时的总抗氧化能力（8 g 抗坏血酸当量抗氧化能力 kg（-1）f.w.）。在货架寿命期间，无论氮施肥和包装处理如何，总维生素 C 含量均下降了 10-20%。收获时的总酚含量为 2 g 没食子酸当量 kg（-1）f.w.，在货架寿命期间略有下降或保留，而总叶绿素在所有处理中均保持在约 550 mg kg（-1）f.w.左右。
在收获后储存期间，施肥量对新鲜切割婴儿菠菜叶的整体质量没有明显影响，而 N2O 富集气氛似乎是被动 MAP 的有前途的替代品，可延长货架寿命。
