Smart film of jackfruit seed starch as a potential indicator of fish freshness

Abstract Smart film from jackfruit seeds containing anthocyanin extract has potential application as a freshness indicator of fish as they deteriorate, changing the color as a function of the product pH. The lower solubility percentage of the films was evidenced by the lower anthocyanin extract volume. The films presented mean water vapour permeability values of 3.034 g.mm/kPa.h.m2. The starch/anthocyanin film (ST4.0:AN5.0) showed higher tensile strength, while ST2.4:AN5.0 and ST3.0:AN5.3 showed lower resistance. A small change in color in the films was evidenced after 48 hours, and fish (FF10) presented a blue color after 146 hours with a reduction in a* values. Shrimp (SF10) presented negative b* values and grayish color. The indicator film provides an alternative for a convenient, non-destructive and easy-to-view method, as well as informing consumers about the quality of the packaged product. The indicator function of the film was positive, suggesting the potential use of industry co-products in developing smart food freshness indicator packaging.

摘要 以菠萝蜜籽为基底、添加花青素提取物的智能薄膜，具备作为鱼类变质新鲜度指示剂的应用潜力：其颜色可随包装内产品的pH值变化而改变。研究证实，花青素提取物添加量越低，薄膜的溶解度百分比亦越低。该类薄膜的平均水蒸气透过率为3.034 g·mm/(kPa·h·m²)。淀粉/花青素薄膜（ST4.0:AN5.0）表现出更高的拉伸强度，而ST2.4:AN5.0与ST3.0:AN5.3的抗张性能更低。48小时后薄膜颜色仅出现微小变化；鱼类样品（FF10）在146小时后呈现蓝色，同时其a*值出现下降。虾类样品（SF10）则表现出负向b*值与灰化色泽。该智能指示薄膜为便捷、无损且易于观察的新鲜度检测方案提供了新思路，同时可帮助消费者直观了解包装内食品的品质状况。本薄膜的指示性能表现优异，表明利用工业副产物开发智能食品新鲜度指示包装具备应用潜力。