Chitosan/tripolyphosphate nanoaggregates enhance the antibrowning effect of ascorbic acid on mushroom slices
Chitosan/tripolyphosphate nanoaggregates enhance the antibrowning effect of ascorbic acid on mushroom slices
复制标题
DOI：
10.1016/j.postharvbio.2019.110934
复制
发表时间：
2019-10-01
影响因子：
7
通讯作者：
Soliva-Fortuny, Robert
中科院分区：
文献类型：
--
作者：
Ojeda, Gonzalo A.;Sgroppo, Sonia C.;Soliva-Fortuny, Robert
酶促布朗宁是影响鲜菇加工品质的主要有害现象。防褐变剂的纳米封装提供了一种新的策略，以防止最小限度地处理商品的变色。在这项研究中，涂层含有AA-加载壳聚糖/三聚磷酸盐纳米聚集体被施加到最低限度的处理蘑菇在5 ℃下储存16天的采后保存评估。以包装顶空成分、布朗宁指数、硬度、酚类和抗坏血酸含量、抗氧化能力和多酚氧化酶活性为质量指标进行评价。结果表明，纳米结构涂层可以有效地减缓布朗宁的发展（布朗宁指数显著降低），并保持硬度。更高水平的酚类化合物，抗坏血酸，以及抗氧化能力的改善，实现了与纳米封装的抗坏血酸的应用。多酚氧化酶的活性被部分抑制，作为一个结果的高AA浓度保持在存储过程中。结果允许得出结论，AA-加载壳聚糖/三聚磷酸盐纳米聚集体是一个有趣的替代品，以防止鲜切蘑菇的布朗宁，并通过冷藏保持高的抗坏血酸浓度。
Enzymatic browning is the main deleterious phenomenon affecting the quality of minimally processed mushrooms. Nano-encapsulation of antibrowning agents provides a new strategy to prevent discoloration in minimally processed commodities. In this study, coatings containing AA-loaded chitosan/tripolyphosphate nanoaggregates were applied to evaluate the postharvest preservation of minimally processed mushrooms during 16 d of storage at 5 degrees C. Package headspace composition, browning index, firmness, phenolic and ascorbic content, antioxidant capacity and polyphenol oxidase activity were evaluated as quality indicators. The results indicate that nanostructured coatings can effectively alleviate browning development (browning index was significantly reduced) and maintain firmness. Higher levels of phenolic compounds, ascorbic acid, as well as improvement in antioxidant capacity were achieved with the application of nano-encapsulated ascorbic acid. Polyphenol oxidase activity was partially inhibited as a consequence of the high AA concentration maintained during storage. The results allow concluding that AA-loaded chitosan/tripolyphosphate nanoaggregates are an interesting alternative to prevent browning of fresh-cut mushrooms and maintain high ascorbic acid concentrations through refrigerated storage.