溶剂交换法制备多孔淀粉并用埃洛石纳米管增强的研究
Preparation and characterization of porous starch reinforced with halloysite nanotube by solvent exchange method.
机构信息
Department of Food Science and Technology, School of Agriculture, Shiraz University, Shiraz, Iran; Seafood Processing Research Group, School of Agriculture, Shiraz University, Shiraz, Iran.
Department of Food Science and Technology, School of Agriculture, Shiraz University, Shiraz, Iran; Seafood Processing Research Group, School of Agriculture, Shiraz University, Shiraz, Iran.
出版信息
Int J Biol Macromol. 2019 Feb 15;123:682-690. doi: 10.1016/j.ijbiomac.2018.11.095. Epub 2018 Nov 14.
The aim of this study was to improvement of adsorption capacity of porous starch (PS) by incorporation of halloysite nanotube (HNT). PS/HNT carrier was synthesized through the solvent exchange method. Various fabrication approaches for PS were introduced and different ethanol ratio (40, 60, 80, 100%), HNT concentration (0, 0.1, 0.2, 0.3, 0.4 and 0.5 mg/mL) and drying method (oven, freeze dryer and microwave) were applied. The results indicated that high ratio of ethanol created larger pores and also the best results were obtained from freeze-dried samples (p < 0.05). Incorporation of HNT could further improve the adsorption capacity. However, the best oil and water adsorption capacity were related to PS alone. The nitrogen adsorption-desorption measurement and scanning electron microscopy elucidated the porous structure of samples. The experimental data were fitted successfully by the Langmuir model rather than Freundlich isotherm. Also PS/HNT had higher apparent density and more negative zeta potential rather than PS. However, the DSC results showed the similar thermal patterns for PS and PS/HNT.
本研究旨在通过掺入埃洛石纳米管（HNT）来提高多孔淀粉（PS）的吸附能力。通过溶剂交换法合成 PS/HNT 载体。介绍了 PS 的各种制备方法，并应用了不同的乙醇比例（40、60、80、100%）、HNT 浓度（0、0.1、0.2、0.3、0.4 和 0.5mg/mL）和干燥方法（烘箱、冷冻干燥和微波）。结果表明，高乙醇比例会产生更大的孔，并且冷冻干燥样品的效果最佳（p<0.05）。掺入 HNT 可以进一步提高吸附能力。然而，最佳的油和水吸附能力与 PS 本身有关。氮吸附-解吸测量和扫描电子显微镜阐明了样品的多孔结构。实验数据通过 Langmuir 模型拟合成功，而不是 Freundlich 等温线。此外，PS/HNT 具有更高的表观密度和更负的 ζ 电位，而不是 PS。然而，DSC 结果表明 PS 和 PS/HNT 具有相似的热模式。
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