Gallotti Francesca, Lavoisier Anaïs, Turchiuli Christelle, Lavelli Vera
DeFENS, University of Milan, 20133 Milan, Italy.
UMR SayFood, Université Paris-Saclay, INRAE, AgroParisTech, 91300 Massy, France.
Antioxidants (Basel). 2020 Dec 3;9(12):1219. doi: 10.3390/antiox9121219.
Polyunsaturated fatty acids and α-tocopherol were encapsulated in powders by spray drying using maltodextrins DE 12 as wall material and different emulsifiers (Tween20, acacia gum or β-glucans-rich extracts from ). The aim was to study the effects of the surfactants on: (a) the oil droplet size distribution and α-tocopherol stability during in vitro digestion, and (b) the oxidative stability during 15 days of accelerated storage. Acacia gum sample had the most stable particle size distribution up to the gastric phase, but showed a significant α-tocopherol degradation prior to the intestinal stage. On the contrary, β-glucan-samples displayed a bimodal distribution in the oral and gastric phases but retained α-tocopherol up to the beginning of the intestinal stage. At the end of intestinal stage, no α-tocopherol was found in the samples. The storage study showed that β-glucans improved the oxidative stability of the powders, which displayed 82% α-tocopherol retention after 5 days under accelerated conditions (60 °C), corresponding to 310 days at 20 °C, while acacia gum and Tween 20 did not delay α-tocopherol degradation. Results highlight the potential antioxidant activity of β-glucans used as emulsifying agents during in vitro digestion and accelerated aging conditions.
使用麦芽糊精DE 12作为壁材和不同的乳化剂（吐温20、阿拉伯胶或富含β-葡聚糖的提取物）通过喷雾干燥将多不饱和脂肪酸和α-生育酚包封在粉末中。目的是研究表面活性剂对以下方面的影响：(a) 体外消化过程中油滴大小分布和α-生育酚稳定性，以及(b) 加速储存15天期间的氧化稳定性。阿拉伯胶样品在胃阶段之前具有最稳定的粒度分布，但在肠道阶段之前显示出显著的α-生育酚降解。相反，β-葡聚糖样品在口腔和胃阶段呈现双峰分布，但在肠道阶段开始时仍保留α-生育酚。在肠道阶段结束时，样品中未发现α-生育酚。储存研究表明，β-葡聚糖提高了粉末的氧化稳定性，在加速条件（60°C）下5天后，粉末中α-生育酚保留率为82%，相当于在20°C下310天，而阿拉伯胶和吐温20没有延迟α-生育酚的降解。结果突出了β-葡聚糖在体外消化和加速老化条件下用作乳化剂时的潜在抗氧化活性。
