王牌, 杨少玲, 戚勃, 杨贤庆, 李春生, 王迪, 赵永强, 李来好, 胡晓, 陈胜军. 不同交联剂对琼胶/海藻酸钠复合膜性能的影响[J]. 南方水产科学, 2023, 19(2): 142-149. DOI: 10.12131/20220134
引用本文: 王牌, 杨少玲, 戚勃, 杨贤庆, 李春生, 王迪, 赵永强, 李来好, 胡晓, 陈胜军. 不同交联剂对琼胶/海藻酸钠复合膜性能的影响[J]. 南方水产科学, 2023, 19(2): 142-149. DOI: 10.12131/20220134
WANG Pai, YANG Shaoling, QI Bo, YANG Xianqing, LI Chunsheng, WANG Di, ZHAO Yongqiang, LI Laihao, HU Xiao, CHEN Shengjun. Effects of different crosslinking agents on properties of agar/sodium alginate composite films[J]. South China Fisheries Science, 2023, 19(2): 142-149. DOI: 10.12131/20220134
Citation: WANG Pai, YANG Shaoling, QI Bo, YANG Xianqing, LI Chunsheng, WANG Di, ZHAO Yongqiang, LI Laihao, HU Xiao, CHEN Shengjun. Effects of different crosslinking agents on properties of agar/sodium alginate composite films[J]. South China Fisheries Science, 2023, 19(2): 142-149. DOI: 10.12131/20220134

不同交联剂对琼胶/海藻酸钠复合膜性能的影响

Effects of different crosslinking agents on properties of agar/sodium alginate composite films

  • 摘要: 琼胶和海藻酸钠是从海藻中提取的亲水性胶体,具有良好的成膜性和生物降解性。为提高琼胶/海藻酸钠复合膜的应用性能,以琼胶、海藻酸钠为成膜基料,甘油为增塑剂,阿魏酸、单宁酸、柠檬酸和丁二酸为交联剂,采用溶液浇筑法制备了琼胶/海藻酸钠复合膜,通过测定复合膜的机械性能、耐水性、阻湿性、不透明度、傅里叶变换红外光谱 (FT-IR) 和微观结构,研究了4种交联剂对复合膜性能的影响。结果表明,4种交联剂均显著提高了复合膜的拉伸强度、耐水性和阻湿性 (P<0.05),但显著降低了膜的透明度 (P<0.05),且当阿魏酸和单宁酸添加量为5%、柠檬酸和丁二酸为10%时,交联剂对复合膜的改善作用最好。4种交联剂中,柠檬酸交联膜的性能最好,当添加量为10%时,其拉伸强度为46.98 MPa,断裂伸长率为17.87%,水溶性为24.17%,溶胀率为38%,水蒸气透过率为0.51 g·mm·(m2·h·kPa)−1。FT-IR分析显示,柠檬酸和丁二酸通过与琼胶和海藻酸钠分子中的羟基 (−OH) 发生酯化反应,改善复合膜的性能,阿魏酸和单宁酸通过与琼胶和海藻酸钠形成分子间氢键实现交联。扫描电镜分析结果表明,琼胶和海藻酸钠的相容性良好,交联剂可使复合膜截面更加致密、光滑。因此,适量添加4种交联剂可不同程度地改善琼胶/海藻酸钠复合膜的理化性能,为包装薄膜的制备及应用提供科学参考。

     

    Abstract: Agar and sodium alginate are hydrophilic colloids extracted from algae, with good film-forming and biodegradability. In order to improve the application performance of agar/sodium alginate composite membrane, we used agar and sodium alginate as film-forming base material, glycerol as plasticizer, ferulic acid, tannin acid, citric acid and succinic acid as crosslinking agents to prepare the agar/sodium alginate composite films by solution casting method. Then we studied the effects of four crosslinking agents on the properties of the composite films based on the mechanical properties, water resistance, moisture resistance, opacity, fourier transform infrared spectroscopy (FT-IR) and microstructure of the composite films. The results show that the four crosslinking agents improved the tensile strength, water resistance and moisture resistance of the composite films significantly (P<0.05), but reduced the transparency significantly (P<0.05). The crosslinking agents had the best improvement effect on the composite films with additions of ferulic acid and tannin acid of 5%, citric acid and succinic acid of 10%. Among the four crosslinking agents, citric acid cross-linked film had the best performance, and when the addition of citric acid was 10%, each index reached the optimal value The tensile strength was 46.98 MPa; the elongation at break was 17.87%; the water solubility was 24.17%; the swelling ratio was 38%; the water vapor permeability (WVP) was 0.51 g·mm·(m2·h·kPa)−1. FT-IR analysis shows that citric acid and succinic acid improved the properties of the composite films by esterifying with −OH of agar and sodium alginate, and ferulic acid or tannin acid achieved crosslinking by forming intermolecular hydrogen bonds with agar and sodium alginate. Scanning electron microscopy (SEM) analysis shows that agar and sodium alginate had good compatibility, and the cross section of composite film became denser and smoother with the addition of crosslinking agents. Therefore, moderate addition of crosslinking agent to agar/sodium alginate composite films can improve the physical and chemical properties of composite films at different degrees, which provides scientific references for the preparation and application of packaging films.

     

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