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Photoprotection of folic acid upon encapsulation in food-grade amaranth (Amaranthus hypochondriacus L.) protein isolate – Pullulan electrospun fibers

机译:叶酸在食品级a菜(Amaranthus hypochondriacus L.)蛋白质分离物中的光保护作用–支链淀粉电纺纤维

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摘要

In this work, the ability of amaranth protein isolate (API):pullulan structures obtained through electrospinning for the photoprotection of bioactive compounds was studied. The model bioactive compound encapsulated was folic acid, due to its great sensitivity to UV light exposure. Addition of 100 mg of folic acid per g of biopolymer to the biopolymeric solution used for electrospinning resulted in increased apparent viscosity and, thus, in thicker electrospun fibers. Very high encapsulation efficiency was obtained (>95%) using this encapsulation technology and no specific chemical interactions were established between the vitamin and the matrix materials as inferred from FTIR analysis. Encapsulation within the API:pullulan structures increased thermal stability of folic acid, which may be useful for food processing applications. Furthermore, no degradation of the encapsulated compound was observed after 2 h of UV exposure, while the characteristic UV–Vis spectrum from the photodegradation compounds of folic acid was observed after UV irradiation of the unprotected vitamin.
机译:在这项工作中,研究了通过静电纺丝获得的a菜蛋白分离物(API):pullulan结构对生物活性化合物进行光保护的能力。封装的模型生物活性化合物是叶酸,因为它对紫外线的敏感性很高。向用于电纺丝的生物聚合物溶液中每克生物聚合物添加100 mg叶酸会导致表观粘度增加,从而使电纺纤维变粗。使用这种封装技术可获得非常高的封装效率(> 95%),并且从FTIR分析推断,维生素与基质材料之间没有建立特定的化学相互作用。 API:pullulan结构内的封装提高了叶酸的热稳定性,这可能对食品加工应用有用。此外,在紫外线照射2小时后,未观察到封装化合物的降解,而在紫外线照射未保护的维生素后,观察到叶酸的光降解化合物的特征UV-Vis光谱。

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