Institute of Sciences of Food Production, National Research Council, Traversa La Crucca 3, Regione Baldinca, 07040 Li Punti, Sassari, Italy.
Food Chem. 2012 Dec 1;135(3):1555-62. doi: 10.1016/j.foodchem.2012.05.121. Epub 2012 Jun 9.
The present paper deals with a novel telemetric device combined with a carbon amperometric sensor system to determine postharvest changes of ascorbic acid (AA) in fresh-cut fruits, without displacing products out of the storage rooms. The investigation was performed on kiwi, pineapple and melon, subjected to minimal processing, packaging, cold storage, and simulated shelf life. Results demonstrated that AA content of fresh-cut fruits of all species declines differently during storage. Cold storage notably reduced the degradation rate of AA in comparison with samples stored at 20°C. The cold-chain interruption resulted in a sharp AA content reduction when the optimal storage condition was not rapidly replaced. Unpredicted results showed a high activity of oxidative enzymes, which prevented AA detection in melon samples. Our sensor system allowed us to demonstrate that both ascorbate peroxidase and ascorbate oxidase affected the oxidative stability and the nutritional quality of fresh cut melon fruits.
本文介绍了一种新型遥测设备，结合碳安培传感器系统，用于检测鲜切水果中抗坏血酸（AA）的采后变化，无需将产品移出贮藏室。研究对象为经过最小化处理、包装、冷藏和模拟货架期的猕猴桃、菠萝和甜瓜。结果表明，所有品种的鲜切水果中的 AA 含量在贮藏过程中下降情况不同。与 20°C 下储存的样本相比，冷藏显著降低了 AA 的降解速率。如果不能迅速恢复最佳储存条件，冷链中断会导致 AA 含量急剧下降。出乎意料的结果表明，氧化酶活性很高，导致无法检测甜瓜样本中的 AA。我们的传感器系统使我们能够证明，抗坏血酸过氧化物酶和抗坏血酸氧化酶都影响了鲜切甜瓜果实的氧化稳定性和营养价值。
