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電場(chǎng)下乙醇對(duì)玉米醇溶蛋白膜性質(zhì)的影響
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國(guó)家自然科學(xué)基金資助項(xiàng)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(guò)程中引入電場(chǎng)處理玉米醇溶蛋白溶液,,在不同乙醇濃度溶劑下,,得到了質(zhì)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(diǎn)。通過(guò)對(duì)薄膜性質(zhì)的測(cè)定,,研究了乙醇濃度與電場(chǎng)協(xié)同作用對(duì)玉米醇溶蛋白膜性質(zhì)的影響,。結(jié)果表明:電場(chǎng)處理可改善玉米醇溶蛋白膜性質(zhì),,在電場(chǎng)與乙醇濃度協(xié)同作用下,玉米醇溶蛋白分子有序排列形成均勻的網(wǎng)絡(luò)狀結(jié)構(gòu),,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(qiáng),;電場(chǎng)處理后薄膜熱特性改變,,變性溫度增大。當(dāng)乙醇體積分?jǐn)?shù)為90%時(shí),,薄膜理化性質(zhì)最佳,,拉伸強(qiáng)度、斷裂伸長(zhǎng)率分別為73.41 MPa,、9.54%,;水蒸氣透過(guò)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(wú)孔隙,;靜態(tài)接觸角測(cè)試為62.46°,變性溫度為116.52℃,,熔融熱為56.61 J/g,;Raman結(jié)果顯示C〖FY=,1〗O雙鍵斷裂,,β-折疊含量增加,。通過(guò)調(diào)節(jié)溶劑濃度可得到具有一定機(jī)械強(qiáng)度,同時(shí)具有疏水特性的薄膜,,為開(kāi)發(fā)可食性食品包裝材料提供了理論基礎(chǔ),。

    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(chǎng)下乙醇對(duì)玉米醇溶蛋白膜性質(zhì)的影響[J].農(nóng)業(yè)機(jī)械學(xué)報(bào),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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