为开发智能包装用pH指示膜,以天然多糖结冷胶(gellan gum,GG)为成膜基质,甘油为增塑剂,蝶豆花花青素(Clitoria ternatea,CT)为天然pH指示剂,羧甲基纤维素钠(sodium carboxymethyl cellulose,CMC)为锁定剂,采用流延法制备具有pH响应性的生物可降解智能指示膜(GG/CMC/CT,GMC)。对指示膜微观结构表征及分析,结果表明,CT与GG、CMC具有良好的相容性且够被锁定在GMC指示膜中。随着CT的添加,GMC指示膜的热稳定性增强。适量的添加CT,会使指示薄膜表面变得平滑且截面也较为平整致密。随着CT含量的增加,指示膜的抗拉强度及阻隔水蒸气能力呈下降趋势,当CT含量达到20%(质量分数,基于GG和CMC)时, 断裂伸长率和阻隔氧气的能力达到最优,分别为21.76%和1.76 cm3·mm/(m2·d·atm)。pH响应测试结果表明,随CT添加量的增加,色度向红色及蓝色方向变化,GMC20及GMC30指示膜在不同pH下均具有良好的响应效果,但考虑成本因素,选择GMC20作为智能包装pH指示膜。
To develop a pH indicator film for intelligent packaging, the biodegradable intelligent indicating films (GG/CMC/CT, GMC) with pH response were prepared by casting method with natural gellan gum (GG) as the film-forming base, glycerol as plasticizers, Clitoria ternatea (CT) anthocyanin as the natural pH indicating agent, and sodium carboxymethyl cellulose (CMC) as the capping agent. The microstructure characterization and analysis of the indicator films showed that CT could be capped in the GG/CMC/CT indicator film and exhibited favorable compatibility with GG, glycerol, and CMC. With the increase of CT addition, the thermal stability of the GG/CMC/CT indicator film was increased. The appropriate CT addition could make the surface of the indicator films smooth and the cross-section relatively flat and dense. With the increase of CT addition, the tensile strength and barrier ability to water vapor of the indicator films showed a downward trend. With 20% of CT added, the optimal elongation at break and barrier ability to oxygen was obtained, which were 21.76% and 1.76 cm3·mm/(m2·d·atm), respectively. The pH response test results showed that the chromaticity changed to red and blue with the increase of CT addition. The GMC20 and GMC30 indicator films had favorable responses to different pH solutions. The GMC20 can be used as a pH indicator film for intelligent packaging for cost consideration.
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