Abstract The aim of this work was to prepare an intelligent Artemisia sphaerocephala Krasch. gum (ASKG)-based film capable of anchoring the natural dye extracted from red cabbage (RCA). For this purpose, carboxymethyl cellulose sodium (CMC·Na) was selected as a host complex. Zeta-potential, Fourier-transform infrared spectroscopy, X-ray diffraction, rheology, and release results revealed that RCA interacted with CMC·Na through electrostatic interactions and altered the complicated spatial structure and crystal structure between ASKG and CMC·Na. The tensile strength, light-transmission and transparency of the films decreased after adding RCA, while elongation at break and water-vapor permeability increased. The RCA solution exhibited a color change from pink to green along with pH variations ranging from 3.0 to 10.0. Additionally, the RCA-containing ASKG/CMC·Na-blended films responded to buffer solutions (from rose-bengal to aquamarine) and NH3 (from yellow-green to yellow). The films containing RCA content >5% were more suitable for practical applications, because they are detectable by the human eye over a wide pH range. These results indicated that RCA-containing ASKG/CMC·Na-blended films exhibited potential as intelligent packaging and gas-sensing labels.

中文翻译：

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基于青蒿的 pH 和 NH3 传感智能薄膜。添加作为宿主复合物的羧甲基纤维素钠锚定的树胶和红甘蓝花青素

摘要 这项工作的目的是制备一种智能的蒿属植物（Artemisia sphaerocephala Krasch）。基于树胶 (ASKG) 的薄膜能够固定从红甘蓝 (RCA) 中提取的天然染料。为此，选择羧甲基纤维素钠（CMC·Na）作为主体复合物。Zeta电位、傅里叶变换红外光谱、X射线衍射、流变学和释放结果表明，RCA通过静电相互作用与CMC·Na相互作用，改变了ASKG和CMC·Na之间复杂的空间结构和晶体结构。添加RCA后薄膜的拉伸强度、透光率和透明度降低，而断裂伸长率和水蒸气渗透率增加。RCA 溶液表现出从粉红色到绿色的颜色变化以及 3.0 到 10.0 的 pH 值变化。此外，含 RCA 的 ASKG/CMC·Na 混合薄膜对缓冲溶液（从玫瑰红到海蓝宝石）和 NH3（从黄绿色到黄色）有反应。RCA 含量 >5% 的薄膜更适合实际应用，因为它们在很宽的 pH 范围内可以被人眼检测到。这些结果表明，含 RCA 的 ASKG/CMC·Na 混合薄膜具有作为智能包装和气敏标签的潜力。