Pinhão coat extract is rich in phenolic compounds. Thus, the present study aimed to encapsulate pinhão (Araucaria angustifolia) coat extract (PCE) in electrospun starch fibers, and evaluate its antioxidant activity and in vitro release. The PCE’ total and individual phenolic compounds were evaluated. Fiber-forming polymer solutions were prepared within 50% of soluble potato starch in 75% of formic acid containing PCE in various concentrations [0%, 0.5%, 1.0% or 1.5% (w/v)] and measured by its rheological parameters and electrical conductivity. The fibers were electrospun and evaluated by efficiency of encapsulation, morphology, size distribution, thermal stability, infrared spectrum, antioxidant activity and in vitro release. The PCE presented high amount of total phenolic compounds (225.32 ± 0.89 μg·g⁻¹) and high concentrations of catechin/epicatechin dimer and catechin. The electrospun starch fibers had encapsulation efficiency values of 62–100% and improved fiber morphology. Encapsulated PCE presented higher thermal stability than its free form and FT-IR spectra showed interactions between fibers constituents. Starch fibers loaded with different PCE concentrations showed antioxidant activity of 28% inhibition, with no statistical difference between the concentrations (p ˃ 0.05). The fibers showed rapid and in low quantities in vitro release, with fibers loaded with 0.5% PCE presenting higher encapsulation efficiency and lower % release. Throughout this study outcome, we can suggest that this biodegradable nanomaterial is applicable as an antioxidant agent in the food industry.

中文翻译：

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富含酚类化合物的Pinhão（Araucaria angustifolia）涂层提取物负载的电纺淀粉纤维

Pinhão外套提取物富含酚类化合物。因此，本研究的目的是在电纺淀粉纤维中包封pinhão（Araucaria angustifolia）大衣提取物（PCE），并评估其抗氧化活性和体外释放。评估了PCE'总量和单个酚类化合物。在各种浓度[0％，0.5％，1.0％或1.5％（w / v）]，并通过其流变参数和电导率进行测量。对纤维进行电纺丝，并通过包封效率，形态，尺寸分布，热稳定性，红外光谱，抗氧化剂活性和体外释放进行评估。PCE的酚类化合物总量很高（225.32±0.89μg·g ^-1）和高浓度的儿茶素/表儿茶素二聚体和儿茶素。电纺淀粉纤维的包封效率值为62-100％，纤维形态得到改善。封装的PCE比其自由形式具有更高的热稳定性，FT-IR光谱显示纤维成分之间存在相互作用。负载了不同PCE浓度的淀粉纤维表现出28％的抗氧化活性，浓度之间无统计学差异（p˃0.05）。纤维显示出快速且少量的体外释放，其中负载有0.5％PCE的纤维表现出更高的包封效率和更低的释放％。在整个研究结果中，我们可以建议这种可生物降解的纳米材料可用作食品工业中的抗氧化剂。