Abstract

Olive oil-in-bitter orange juice (O/W) nano-emulsions were prepared by Phase Inversion Composition method. Binary combinations of Tween80, Span20, sucrose monopalmitate and sunflower lecithin were used as surfactants. Influence of type (locust bean gum, xanthan gum, iota-carrageenan) and concentration (0–0.40%) of added hydrocolloid upon physical (visual appearance, transparency (T), microstructure, particle size (D₄₃)) and rheological properties (consistency index (K), flow index (n), apparent viscosity (Ƞ_a) of nano-emulsions were investigated. The lowest D₄₃ (0.143 µm–0.569 µm) and Ƞ_a (2.46–2.51 cp) accompanied with the highest T (47.50–70.65%) were observed in nano-emulsions prepared without hydrocolloid. Significant negative correlation was found between D₄₃, Ƞ_a and T, i.e., hydrocolloid addition increased the Ƞ_a and D₄₃, as well as T loss. The Power Law model was well-suited to the experimental data (R²>0.9534). The n values of Tween80/Span20, Tween80/SL and Tween80/SMP nano-emulsions in the absence of hydrocolloid were 1.00, 0.98 and 0.99, respectively, which presents a Newtonian behavior. The n values of Tween80/Span20, Tween80/SL and Tween80/SMP nano-emulsions in the presence of LBG, XA and i-CARR at varying concentrations were in the range of 0.16–0.99, 0.13–0.98 and 0.15–0.97, respectively, which presents Non-Newtonian shear-thinning behavior. Same type of hydrocolloid showed similar trend in all nano-emulsions regardless of emulsion composition. There has been significant positive correlation between D₄₃, K and Ƞ_a, while there has been significant negative correlation between T, n and Ƞ_a.

摘要

采用转相合成法制备苦橙汁橄榄油(O/W)纳米乳。Tween80、Span20、蔗糖单棕榈酸酯和向日葵卵磷脂的二元组合用作表面活性剂。添加水胶体的类型（刺槐豆胶、黄原胶、iota-卡拉胶）和浓度（0-0.40%）对物理（外观、透明度（T）、微观结构、粒度（D ₄₃））和流变性能（考察_了纳米乳液的稠度指数（K）、流动指数（n）、表观粘度（σa ），D ₄₃（0.143 µm–0.569 µm）和σa （ 2.46–2.51 cp）最低_，最高在没有水胶体制备的纳米乳液中观察到T (47.50–70.65%)。_{D 43}、σ _a和T之间存在显着的负相关，即水胶体的加入增加了σ _a和D ₄₃，同时也增加了T损失。幂律模型非常适合实验数据（R ² >0.9534）。Tween80/Span20、Tween80/SL 和 Tween80/SMP 纳米乳液在无水胶体条件下的n值分别为 1.00、0.98 和 0.99，呈现牛顿行为。n _在不同浓度的 LBG、XA 和i- CARR存在下，Tween80/Span20、Tween80/SL 和 Tween80/SMP 纳米乳液的值分别在 0.16-0.99、0.13-0.98 和 0.15-0.97 的范围内，其中呈现非牛顿剪切稀化行为。无论乳液成分如何，相同类型的水胶体在所有纳米乳液中都表现出相似的趋势。D ₄₃、K和Ƞ _a之间存在显着的正相关，而T、n和Ƞ _a之间存在显着的负相关。