Macura Ryszard, Michalczyk Magdalena, Fiutak Grzegorz, Maciejaszek Ireneusz
University of Agriculture in Krakow, Poland.
Acta Sci Pol Technol Aliment. 2019 Apr-Jun;18(2):135-142. doi: 10.17306/J.AFS.0637.
In stored freeze-dried orange carrots, carotenoids are not stable compounds. The aim of the work was to evaluate the stability of carotenoids in products obtained from polyphenol-rich purple carrots which additionally contain anthocyanins.
This study compares the effect of air-drying and freeze-drying as well as 6-month storage on the content of carotenoids, anthocyanins and total phenolics in dried products obtained from purple carrot.
The phenolic compounds found in the greatest amounts in carrot were ferulic acid cyanidin 3-xylosylglucosylgalactoside, p-coumaric acid cyanidin 3-xylosylglucosylgalactoside, chlorogenic acid, and caffeic-quinic acid. Freeze-drying did not significantly reduce levels of carotenoids and anthocyanin content, while air-drying led to substantial losses of carotenoids, anthocyanins and polyphenols. 6-month storage of freeze-dried products caused losses of carotenoids, anthocyanins and total polyphenols of 42%, 33% and 53% respectively when compared with the raw material. In air-dried products, the losses were 66%, 33% and 36%, respectively.
The results indicate that the combined effect of freeze-drying and 6-month storage was reduced losses of carotenoids compared to traditionally dried products.
在储存的冻干橙色胡萝卜中，类胡萝卜素不是稳定的化合物。这项工作的目的是评估从富含多酚的紫色胡萝卜中获得的产品中类胡萝卜素的稳定性，这种紫色胡萝卜还含有花青素。
本研究比较了风干和冻干以及6个月储存对从紫色胡萝卜获得的干燥产品中类胡萝卜素、花青素和总酚含量的影响。
胡萝卜中含量最高的酚类化合物是阿魏酸矢车菊素3-木糖基葡萄糖基半乳糖苷、对香豆酸矢车菊素3-木糖基葡萄糖基半乳糖苷、绿原酸和咖啡酸奎尼酸。冻干并没有显著降低类胡萝卜素和花青素的含量，而风干导致类胡萝卜素、花青素和多酚大量损失。与原材料相比，冻干产品储存6个月后，类胡萝卜素、花青素和总多酚的损失分别为42%、33%和53%。在风干产品中，损失分别为66%、33%和36%。
结果表明，与传统干燥产品相比，冻干和6个月储存的综合作用减少了类胡萝卜素的损失。
