为改善羧甲基壳聚糖(carboxymethyl chitosan, CMC)膜的耐水性,该文以美拉德反应(maillard reaction, MR)为改性方法,研究MR条件对CMC改性膜耐水性的影响,以及MR程度与CMC改性膜性能和结构之间的关系。结果表明,添加还原糖的MR可以改善CMC膜的耐水性,其中木糖效果最好;随着木糖占比的增加,CMC改性膜耐水性呈先升高后降低的趋势,当CMC/木糖比例为4∶1时CMC改性膜耐水性最好;膜液初始pH值对CMC改性膜的耐水性无显著影响;随着反应温度的升高和反应时间的延长,CMC改性膜的A420升高、耐水性增强,CMC改性膜的耐水性与MR程度相关。随着MR程度的加深,CMC改性膜的颜色加深、亮度下降,拉伸强度、抗氧化和抗菌活性升高,透光率和断裂伸长率降低,结构更为致密、结晶度下降、分子相互作用增强。该研究结果为CMC膜在高水分含量食品中的应用提供技术参考。
To improve the water resistance property of carboxymethyl chitosan (CMC) film, the CMC film was modified by Maillard reaction (MR) in this study.The effects of MR conditions on the water solubility of modified CMC films were studied.The relationship between MR degree and the performance and structure of CMC modified films were analyzed.The results indicated that the MR between CMC and reducing sugar can improve the water resistance property of CMC film, with xylose having the best modification effect.With the increase of xylose content, the water resistance properties of CMC modified films showed a trend of first increasing and then decreasing.The water resistance property of CMC modified film was best when the CMC/xylose ratio was 4∶1.The initial pH value of the film solution has no significant effect on the film water resistance properties.With the increase of reaction temperature and the extension of reaction time, the A420 of the CMC modified films increased and its water resistance properties enhanced.The water resistance of CMC modified films was related to the MR degree.As the MR degree deepens, the color of CMC modified films deepened, the brightness decreased, the tensile strength, antioxidant and antibacterial activities increased, the transmittance and elongation at break decrease, the structure become denser, the crystallinity decreases, and the molecular interactions were enhanced.The results of this study provide a methodological reference for the application of CMC film in high moisture content foods.
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