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W/O乳液凝固劑對SPI冷凝膠流變特性與微觀結構的影響
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國家自然科學基金資助項目(31171648)和“十二五”國家科技支撐計劃資助項目(2012BAD34B03)


Effect of W/O Emulsion Coagulants on Rheological Properties and Microstructure of Cold-set SPI Gels
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    摘要:

    采用掃描電鏡(SEM)、質地剖面分析(TPA)及動態(tài)流變技術研究鹵水及不同油包水(W/O)乳液凝固劑對大豆分離蛋白(SPI)冷凝膠微觀結構及流變特性的影響。流變結果表明,彈性模量(G′)的變化高度依賴W/O乳液中的鎂鹽釋放速度。隨著反應時間的延長,G′值不斷增大,與傳統(tǒng)鹵水相比,新型W/O乳液凝固劑延長了冷凝膠的凝固時間,在凝膠形成過程中,W/O乳液對鎂鹽起到了緩釋作用。對比不同W/O乳液凝固劑發(fā)現(xiàn),含有乳清分離蛋白(WPI)的乳液形成SPI冷凝膠的時間更長,而且彈性模量值更小。此外,電鏡結果表明W/O乳液凝固劑能顯著降低冷凝膠的硬度并改善蛋白凝膠的網絡結構,使SPI冷凝膠具有更小的網孔孔隙和更加均勻的網狀結構。

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    Scanning electron microscopy (SEM), texture profile analysis (TPA) and dynamic rheology technique were applied to investigate the effect of traditional bittern and different water in oil (W/O) emulsion coagulants on the rheological properties and microstructure of cold-set SPI gels. Rheological tests suggested that the development of the mechanical moduli (G′) of these SPI gels was highly dependent on the release rate of magnesium salts from W/O emulsions. The values of G′in all cold-set SPI gels gradually increased with the extension of time and W/O emulsion coagulants prolonged the solidification time of cold-set SPI gels in comparison with traditional bittern coagulant. This could be attributed to the controlled-release properties of W/O emulsion coagulants. In addition, cold-set SPI gel prepared with W/O emulsion coagulant containing WPI exhibited a longer solidification time and a lower value of G′than W/O emulsions without WPI. Cold-set SPI gels induced by W/O emulsion coagulants had better microstructure than that of traditional bittern coagulant as shown by SEM results, which elucidated that W/O emulsion coagulants could obviously decrease the strength of cold-set SPI gels and produce protein gels with smaller pores and more homogeneous network structure.

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朱巧梅,酈金龍,范鑫,殷麗君. W/O乳液凝固劑對SPI冷凝膠流變特性與微觀結構的影響[J].農業(yè)機械學報,2015,46(2):240-246. Zhu Qiaomei, Li Jinlong, Fan Xin, Yin Lijun. Effect of W/O Emulsion Coagulants on Rheological Properties and Microstructure of Cold-set SPI Gels[J]. Transactions of the Chinese Society for Agricultural Machinery,2015,46(2):240-246.

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  • 收稿日期:2014-03-12
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  • 在線發(fā)布日期: 2015-02-10
  • 出版日期: 2015-02-10
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