College of Food Science and Engineering, Jilin University, Changchun 130062, China; Electron Microscopy Center, Jilin University, Changchun 130012, China.
College of Food Science and Engineering, Jilin University, Changchun 130062, China.
Int J Biol Macromol. 2021 Jul 31;183:2121-2130. doi: 10.1016/j.ijbiomac.2021.05.196. Epub 2021 Jun 1.
Compounding is a safe method to avoid limitations of a singular gel. Here, composite gels were prepared with konjac glucomannan (KGM) and gum arabic (GA) and evaluated by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), water solubility index (WSI), water absorption index (WAI), texture profile analysis (TPA) and rheological analysis. The gel stratified when GA concentration ≥ 2.5%. FTIR indicated that the interactions of KGM and GA were mainly related to hydrogen bonds and acetyl groups, and the solution separated from gels only included GA and water molecules. The microstructures became denser and contained smaller holes at high GA concentrations as seen by SEM. WSI and WAI both increased with GA increasing. Hardness and springiness dropped when GA concentration increased from 0 to 2.0%, but they increased when GA increased from 2.0% to 4.0%. Rheological analysis showed the gels were non-Newtonian pseudoplastic fluids, with anti-thixotropy (GA ≤ 3.5%) and thixotropy (GA ≥ 4.0%). Furthermore, the gels could be classified as non-covalent gels, with higher gel strength at high GA concentrations. The non-covalent linkages included hydrogen bonding and hydrophobic interaction, and hydrogen bonding held the dominated status. Therefore, KGM and GA have antagonistic and synergistic effects.
复配是一种避免单一凝胶局限性的安全方法。在这里，通过傅里叶变换红外光谱（FTIR）、扫描电子显微镜（SEM）、水溶性指数（WSI）、吸水率指数（WAI）、质构分析（TPA）和流变分析，制备了魔芋葡甘聚糖（KGM）和阿拉伯胶（GA）的复合凝胶。当 GA 浓度≥2.5%时，凝胶分层。FTIR 表明 KGM 和 GA 的相互作用主要与氢键和乙酰基有关，从凝胶中分离出来的溶液仅包含 GA 和水分子。SEM 显示，随着 GA 浓度的增加，微观结构变得更加致密，小孔更小。WSI 和 WAI 都随着 GA 的增加而增加。当 GA 浓度从 0 增加到 2.0%时，硬度和弹性下降，但当 GA 从 2.0%增加到 4.0%时，它们又增加。流变分析表明，凝胶是非牛顿假塑性流体，具有抗触变性（GA≤3.5%）和触变性（GA≥4.0%）。此外，这些凝胶可以被归类为非共价凝胶，在高 GA 浓度下具有更高的凝胶强度。非共价键合包括氢键和疏水相互作用，氢键起主导作用。因此，KGM 和 GA 具有拮抗和协同作用。
