基于共晶混合物增塑壳聚糖的优化 pH 响应膜。
Optimized pH-responsive film based on a eutectic mixture-plasticized chitosan.
机构信息
Programa de Pós-Graduação em Ciência de Alimentos, Instituto de Química, Universidade Federal do Rio de Janeiro, Avenida Athos da Silveira Ramos 149, 21941-909 Rio de Janeiro, RJ, Brazil.
Programa de Pós-Graduação em Ciência de Alimentos, Instituto de Química, Universidade Federal do Rio de Janeiro, Avenida Athos da Silveira Ramos 149, 21941-909 Rio de Janeiro, RJ, Brazil; Instituto de Macromoléculas Professora Eloisa Mano, Universidade Federal do Rio de Janeiro, Avenida Horácio Macedo 2030, 21941-598 Rio de Janeiro, RJ, Brazil.
出版信息
Carbohydr Polym. 2017 Jun 1;165:238-246. doi: 10.1016/j.carbpol.2017.02.047. Epub 2017 Feb 16.
Chitosan (CS, 2g/100mL)/curcumin 1g/100mL in acetic acid aqueous solution were used to prepare films to be used as food indicator. Microcrystalline cellulose (MCC) and a eutectic mixture (DES) were incorporated as reinforcing and plasticizing agents, respectively. The MCC content (133 mas%) and DES composition (7.93 mass%), based on CS dry mass, were optimized. The properties of the DES-plasticized film were compared to those for the unplasticized and glycerol (G)-plasticized CS films. The DES-plasticized film presented initial temperature of thermal decomposition at 267.7°C, dynamic glass transition at 149.3°C, water vapor permeability of 7.21×10gsmPa, water solubility of 3.07% and stress at break of 20.1MPa. The incorporation of MCC contributed to increase the crystallinity of the composite films. Colorimetric tests, carried out in aqueous environments for the DES-plasticized film, revealed accentuated color changes, mainly at pHs higher than pH 8.
壳聚糖（CS，2g/100mL）/姜黄素 1g/100mL 在乙酸水溶液中被用来制备用作食品指示剂的薄膜。微晶纤维素（MCC）和共晶混合物（DES）分别被用作增强剂和增塑剂。基于 CS 干重，优化了 MCC 含量（133mas%）和 DES 组成（7.93 质量%）。将 DES 增塑的薄膜的性能与未增塑和甘油（G）增塑的 CS 薄膜的性能进行了比较。DES 增塑的薄膜的初始热分解温度为 267.7°C，动态玻璃化转变温度为 149.3°C，水蒸气渗透率为 7.21×10gsmPa，水溶性为 3.07%，断裂应力为 20.1MPa。MCC 的加入有助于提高复合膜的结晶度。在水性环境中对 DES 增塑薄膜进行的比色测试显示出明显的颜色变化，主要在 pH 值高于 pH 8 时。
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