纤维素纳米晶/明胶双层乳液的制备及其稳定性能研究
Study on the fabrication and stability of cellulose nanocrystal/gelatin bilayer emulsions
利用硫酸水解法制备硫酸酯基改性的纤维素纳米晶(CNC),通过静电层层自组装法将质子化明胶(带正电)组装到带负电CNC稳定的乳液液滴表面,形成CNC/明胶(CNC-Gel)双层乳液。研究结果表明:随着明胶浓度的增加,CNC-Gel乳液的粒径呈先降低后增加的趋势,乳液稳定性呈先增强后降低的趋势;当明胶浓度为0.75%时,CNC-Gel-0.75乳液具有最小的粒径和最佳的稳定性。储藏30 d后,CNC-Gel-0.75保持稳定,具有良好的储藏稳定性。此外,CNC-Gel-0.75展现出优异的温度、离子强度和pH稳定性,适用于食品复杂的加工场景。本研究为提升CNC乳液的稳定性提供了新的研究思路,拓展了CNC乳液的应用范围。
In this study,sulfate ester-modified cellulose nanocrystals (CNC) were prepared via sulfuric acid hydrolysis.Protonated gelatin (positively charged) was then assembled onto the surfaces of negatively charged CNC-stabilized emulsion droplets using the electrostatic layer-by-layer self-assembly method,forming CNC/gelatin (CNC-Gel) bilayer emulsions.The results demonstrated that the droplet size of CNC-Gel emulsions first decreased and then increased with increasing gelatin concentration,while the emulsion stability initially increased followed by a decrease.At a gelatin concentration of 0.75%,the CNC-Gel-0.75 emulsion exhibited the smallest droplet size and the optimal stability.In addition,the CNC-Gel-0.75 emulsion remained stable after 30 days of storage,indicating excellent storage stability.Furthermore,CNC-Gel-0.75 exhibited robust stability against temperature variations,ionic strength changes,and pH fluctuations,demonstrating its viability for complex food processing operations.This study proposes a novel strategy to enhance the stability of CNC-based emulsions while broadening their application scope.
cellulose nanocrystals / stability / bilayer emulsion / gelatin
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湖北省教育厅科学技术研究计划中青年人才项目(Q20248405)
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