大豆分离蛋白作为完全可降解性的生物聚合物,无抗菌性、机械性能及阻隔性能差限制了其在包装领域中的应用,该研究通过将纳米ZnO和纳米TiO_(2)分别加入大豆分离蛋白(Soy Protein Isolate,SPI)中制备SPI/纳米ZnO复合膜和SPI/纳米TiO_(2)...大豆分离蛋白作为完全可降解性的生物聚合物,无抗菌性、机械性能及阻隔性能差限制了其在包装领域中的应用,该研究通过将纳米ZnO和纳米TiO_(2)分别加入大豆分离蛋白(Soy Protein Isolate,SPI)中制备SPI/纳米ZnO复合膜和SPI/纳米TiO_(2)复合膜,并对复合膜的包装特性进行比较,确定一种更有利于提升大豆分离蛋白基薄膜相关性能的纳米材料。分析结果表明:纳米ZnO在SPI膜液中的分散性优于纳米TiO_(2)在SPI膜液中的分散性,纳米ZnO和大豆蛋白的相容性更好,且成膜后能更好的发挥协同作用,SPI/纳米ZnO复合膜较SPI/纳米TiO_(2)复合膜的机械性能、阻隔性能和抗菌性能更为突出(P<0.05)。纳米ZnO和大豆蛋白以3%的质量比制备复合膜时,SPI/纳米ZnO(SZ3)复合膜相比较于SPI膜,拉伸强度从6.64 MPa升至18.33 MPa,水蒸气透过率从20.63×10^(-2)g·mm/(m^(2)·h·kPa)降至2.94×10^(-2)g·mm/(m^(2)·h·kPa),氧气透过率从3.32×10^(-5)g·m/(m^(2)·d·kPa)降至1.54×10^(-5)g·m/(m^(2)·d·kPa)。此外,复合膜对大肠杆菌和短小芽孢杆菌表现出优异的抗菌性能,抑菌性随着纳米粒子的添加呈上升趋势,在活性包装应用中具有极大潜力。以上研究结果将为大豆蛋白基薄膜的未来应用提供理论参考。展开更多
大豆蛋白膜是以大豆分离蛋白(soybean protein isolate,SPI)为主料,添加适量增塑剂形成具有一定机械性能的包装薄膜,但其在贮藏过程中机械性能的不稳定是制约其在实际中应用的主要因素。因此本实验选取甘油、山梨醇、油酸3种增塑剂制备...大豆蛋白膜是以大豆分离蛋白(soybean protein isolate,SPI)为主料,添加适量增塑剂形成具有一定机械性能的包装薄膜,但其在贮藏过程中机械性能的不稳定是制约其在实际中应用的主要因素。因此本实验选取甘油、山梨醇、油酸3种增塑剂制备SPI膜,以贮藏期间抗拉强度、断裂延伸率、水蒸气透过率、水溶失率的变化为评价指标,探讨添加不同增塑剂的SPI膜在贮藏期间机械性能变化规律。结果表明,以甘油、山梨醇和油酸组合(2∶1∶1,m/m)作为增塑剂制备SPI膜时,SPI膜机械性能稳定性最佳,与空白组(单独由甘油增塑的SPI膜)相比,抗拉强度稳定性提高了64%,断裂延伸率稳定性提高了65%,水蒸气透过率稳定性提高了27%,对水的稳定性提高了20%。本实验可为SPI包装薄膜在实际中更广泛的应用提供一定的理论依据。展开更多
Soy protein isolate/carboxymethyl chitosan (SPI/CMCH) blended films incorporated with glycerol were prepared using solution casting to investigate the effects of the SPI and CMCH ratios (100:0, 88:12, 67:33, 50...Soy protein isolate/carboxymethyl chitosan (SPI/CMCH) blended films incorporated with glycerol were prepared using solution casting to investigate the effects of the SPI and CMCH ratios (100:0, 88:12, 67:33, 50:50, 33:67, 12:88, 0:100) on the water sorption isotherm. The moisture sorption isotherm of the SPI/CMCH blended films was determined using various relative humidity's (16%, 35%, 55% and 76% RH) at 25 ± 1℃. The isotherms showed that the equilibrium moisture content (EMC) of the films increased with increasing CMCH content and the EMC value sharply increased above aw = 0.55. Understanding of sorption isotherms is important for prediction of moisture sorption properties of films via moisture sorption empirical models. The Guggenheim-Oswin, Brunauer-Emmett-Teller (BET), and Anderson-de Boer (GAB) sorption model predictions were tested against the experimental data. The root mean square (RMS) values from the Oswin, BET, and GAB models respectively ranged from 698.54 to 1,557.54, 38.85 to 58.30, and 52.52 to 95.95. Therefore, the BET model was found to be the best-fit model for SPI/CMCH blended films at 25 ± 1 ℃.展开更多
文摘大豆分离蛋白作为完全可降解性的生物聚合物,无抗菌性、机械性能及阻隔性能差限制了其在包装领域中的应用,该研究通过将纳米ZnO和纳米TiO_(2)分别加入大豆分离蛋白(Soy Protein Isolate,SPI)中制备SPI/纳米ZnO复合膜和SPI/纳米TiO_(2)复合膜,并对复合膜的包装特性进行比较,确定一种更有利于提升大豆分离蛋白基薄膜相关性能的纳米材料。分析结果表明:纳米ZnO在SPI膜液中的分散性优于纳米TiO_(2)在SPI膜液中的分散性,纳米ZnO和大豆蛋白的相容性更好,且成膜后能更好的发挥协同作用,SPI/纳米ZnO复合膜较SPI/纳米TiO_(2)复合膜的机械性能、阻隔性能和抗菌性能更为突出(P<0.05)。纳米ZnO和大豆蛋白以3%的质量比制备复合膜时,SPI/纳米ZnO(SZ3)复合膜相比较于SPI膜,拉伸强度从6.64 MPa升至18.33 MPa,水蒸气透过率从20.63×10^(-2)g·mm/(m^(2)·h·kPa)降至2.94×10^(-2)g·mm/(m^(2)·h·kPa),氧气透过率从3.32×10^(-5)g·m/(m^(2)·d·kPa)降至1.54×10^(-5)g·m/(m^(2)·d·kPa)。此外,复合膜对大肠杆菌和短小芽孢杆菌表现出优异的抗菌性能,抑菌性随着纳米粒子的添加呈上升趋势,在活性包装应用中具有极大潜力。以上研究结果将为大豆蛋白基薄膜的未来应用提供理论参考。
文摘大豆蛋白膜是以大豆分离蛋白(soybean protein isolate,SPI)为主料,添加适量增塑剂形成具有一定机械性能的包装薄膜,但其在贮藏过程中机械性能的不稳定是制约其在实际中应用的主要因素。因此本实验选取甘油、山梨醇、油酸3种增塑剂制备SPI膜,以贮藏期间抗拉强度、断裂延伸率、水蒸气透过率、水溶失率的变化为评价指标,探讨添加不同增塑剂的SPI膜在贮藏期间机械性能变化规律。结果表明,以甘油、山梨醇和油酸组合(2∶1∶1,m/m)作为增塑剂制备SPI膜时,SPI膜机械性能稳定性最佳,与空白组(单独由甘油增塑的SPI膜)相比,抗拉强度稳定性提高了64%,断裂延伸率稳定性提高了65%,水蒸气透过率稳定性提高了27%,对水的稳定性提高了20%。本实验可为SPI包装薄膜在实际中更广泛的应用提供一定的理论依据。
文摘Soy protein isolate/carboxymethyl chitosan (SPI/CMCH) blended films incorporated with glycerol were prepared using solution casting to investigate the effects of the SPI and CMCH ratios (100:0, 88:12, 67:33, 50:50, 33:67, 12:88, 0:100) on the water sorption isotherm. The moisture sorption isotherm of the SPI/CMCH blended films was determined using various relative humidity's (16%, 35%, 55% and 76% RH) at 25 ± 1℃. The isotherms showed that the equilibrium moisture content (EMC) of the films increased with increasing CMCH content and the EMC value sharply increased above aw = 0.55. Understanding of sorption isotherms is important for prediction of moisture sorption properties of films via moisture sorption empirical models. The Guggenheim-Oswin, Brunauer-Emmett-Teller (BET), and Anderson-de Boer (GAB) sorption model predictions were tested against the experimental data. The root mean square (RMS) values from the Oswin, BET, and GAB models respectively ranged from 698.54 to 1,557.54, 38.85 to 58.30, and 52.52 to 95.95. Therefore, the BET model was found to be the best-fit model for SPI/CMCH blended films at 25 ± 1 ℃.