College of Grain Science and Technology, Shenyang Normal University, Shenyang 110034, China.
Department of Food Science, Rutgers, The State University of New Jersey, 65 Dudley Road, New Brunswick, NJ 08901, USA.
Int J Biol Macromol. 2020 Jan 15;143:401-412. doi: 10.1016/j.ijbiomac.2019.10.261. Epub 2019 Nov 21.
Copolymer nanoparticles with pH-responsive properties were prepared by grafting different amounts of 2-(dimethylamine) ethyl methacrylate (DMAEMA) on carboxymethyl maize starch (CMS). The formation of CMS-g-DMAEMA was verified by different techniques and was then used for stabilization of Pickering emulsion at different pH values. The CMS-g-DMAEMA nanoparticles showed pH-responsive properties in Pickering emulsion and the pH-responsivity increased as the amount of DMAEMA increased in the CMS-g-DMAEMA copolymer. The prepared Pickering emulsion underwent emulsion/demulsification transitions at different pH values. The microscopy analysis verified the attachment of CMS-g-DMAEMA on oil-water interface of Pickering emulsion. Pickering emulsion showed different droplets size, contact angle, and Zeta-potential depend on pH value and CMS/DMAEMA ratio in the CMS-g-DMAEMA copolymer. The obtained results revealed that CMS-g-DMAEMA copolymer can be successfully used for preparing and stabilizing of Pickering emulsion at pH 10.
具有 pH 响应特性的共聚物纳米粒子通过在羧甲基玉米淀粉（CMS）上接枝不同量的 2-（二甲氨基）乙基甲基丙烯酸酯（DMAEMA）来制备。通过不同的技术验证了 CMS-g-DMAEMA 的形成，然后将其用于在不同 pH 值下稳定 Pickering 乳液。CMS-g-DMAEMA 纳米粒子在 Pickering 乳液中表现出 pH 响应特性，并且随着 CMS-g-DMAEMA 共聚物中 DMAEMA 量的增加，pH 响应性增加。制备的 Pickering 乳液在不同 pH 值下经历乳液/破乳转变。显微镜分析证实了 CMS-g-DMAEMA 在 Pickering 乳液油水界面上的附着。Pickering 乳液的液滴大小、接触角和 Zeta 电位取决于 pH 值和 CMS/DMAEMA 共聚物中的比例。所得结果表明，CMS-g-DMAEMA 共聚物可成功用于在 pH 10 下制备和稳定 Pickering 乳液。
