An easy-to-use food packaging label with pH and ammonia sensitivity was developed by adding betacyanin (5, 10 and 15 mg per g of starch) from flowers of paperflower (Bougainvillea glabra) to potato starch film made using the solvent casting method. The betacyanin was well dispersed into the starch matrix and formed new interactions with it as revealed by FTIR. The film containing 15 mg/g of betacyanin showed a color change from light pink to yellow as a response to pH adjustment of between 2 to 13. It was also able to detect the presence of ammonia in a range of 0.1 and 0.01 mg of ammonia per ml of water. Surface hydrophobicity and water vapor barrier capacity of the starch film increased by addition of the betacyanin, yet their mechanical strength decreased in the presence of the betacyanin. The ability of the film in the real-time indication of fish quality as a label was also evaluated during the storage of Caspian sprat at 4 °C. A visual change in the color of the packaging label from pink to yellow in parallel with the increase in the total volatile basic nitrogen (TVB-N), microbial count of the fish samples was detected. The starch/betacyanin film could be a novel intelligent label for application in food packaging.

通过添加来自纸花 ( Bougainvillea glabra) 使用溶剂浇铸法制成的马铃薯淀粉薄膜。正如 FTIR 所揭示的那样，甜菜红苷很好地分散到淀粉基质中并与其形成新的相互作用。含有 15 mg/g 甜菜花青素的薄膜显示颜色从浅粉色变为黄色，作为对 2 至 13 之间的 pH 调节的响应。它还能够检测到 0.1 至 0.01 毫克氨的存在每毫升水。淀粉膜的表面疏水性和水蒸气阻隔能力通过添加甜菜花苷而增加，但在甜菜花苷存在下它们的机械强度降低。在里海鲱鱼在 4°C 下储存期间，还评估了薄膜作为标签实时指示鱼质量的能力。随着总挥发性碱性氮 (TVB-N) 的增加，包装标签的颜色从粉红色变为黄色的视觉变化，检测到鱼样品的微生物计数。淀粉/β花青素薄膜可能是一种应用于食品包装的新型智能标签。