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電場下乙醇對玉米醇溶蛋白膜性質的影響
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國家自然科學基金資助項目(31271974)


Effects of Ethyl Alcohol Concentrations on Properties of Zein Films Produced by Casting under Electric Field Films Produced by Casting under Electric Field
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    摘要:

    在澆鑄法成膜過程中引入電場處理玉米醇溶蛋白溶液,在不同乙醇濃度溶劑下,得到了質地柔軟、形狀完整的玉米醇溶蛋白膜,克服了純玉米醇溶蛋白膜易碎裂、耐水性差的缺點。通過對薄膜性質的測定,研究了乙醇濃度與電場協同作用對玉米醇溶蛋白膜性質的影響。結果表明:電場處理可改善玉米醇溶蛋白膜性質,在電場與乙醇濃度協同作用下,玉米醇溶蛋白分子有序排列形成均勻的網絡狀結構,提高了薄膜的均一性;隨著乙醇濃度的增大,玉米醇溶蛋白膜表面疏水性增強;電場處理后薄膜熱特性改變,變性溫度增大。當乙醇體積分數為90%時,薄膜理化性質最佳,拉伸強度、斷裂伸長率分別為73.41 MPa、9.54%;水蒸氣透過率為2.54×10-8 g〖DK〗?m/(m2?h?Pa);SEM觀察顯示薄膜表面粗糙度明顯降低,斷面無孔隙;靜態(tài)接觸角測試為62.46°,變性溫度為116.52℃,熔融熱為56.61 J/g;Raman結果顯示C〖FY=,1〗O雙鍵斷裂,β-折疊含量增加。通過調節(jié)溶劑濃度可得到具有一定機械強度,同時具有疏水特性的薄膜,為開發(fā)可食性食品包裝材料提供了理論基礎。

    Abstract:

    Coupled with the paralleled uniform electric field, the soft zein films with complete shape were obtained by casting. Effect of the electric field force on mechanical properties of zein film prepared for different alcohol concentrations was studied. As the tertiary structure of zein molecules was destroyed by electric field force, charged polar residues (amino groups and carboxyl groups, etc) exposed and directionally moved along the electric field lines. The stable state of micelle-like structured zein molecules was seesawed until the molecules found some new levels of equilibrium. It was demonstrated that at the initial phase, tensile strength, breaking elongation and contact angle of films were increased with the increase of the concentrations of ethanol solution, and reached the maximum value (73.41 MPa, 9.54% and 62.46°, respectively); water vapour permeability (WVP) reached the minimum value of 2.54×10-8 g?m/(m2?h?Pa). The changes of C〖FY=,1〗O and β-sheet vibrating peaks of Raman analysis indicated denaturation of protein partly. Observations under scanning electron microscope (SEM) of surface and cross section revealed that the presence of uniform electric field helped to improve the properties of zein films. In conclusion, the findings of the synergistic effect of ethanol and the paralleled uniform electric field on zein films may contribute to develop edible food packaging material with ideal surface morphology and hydrophobicity.

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徐慧,陳野.電場下乙醇對玉米醇溶蛋白膜性質的影響[J].農業(yè)機械學報,2015,46(10):298-303. Xu Hui, Chen Ye. Effects of Ethyl Alcohol Concentrations on Properties of Zein Films Produced by Casting under Electric Field Films Produced by Casting under Electric Field[J]. Transactions of the Chinese Society for Agricultural Machinery,2015,46(10):298-303.

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  • 收稿日期:2015-01-21
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  • 在線發(fā)布日期: 2015-10-10
  • 出版日期: 2015-10-10
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