不同产地紫皮洋葱营养成分的分析比较

为明确不同产地紫皮洋葱营养成分的组成，识别对产地判别具有重要贡献的特征组分，以河北、山东、云南和甘肃4个产地的紫皮洋葱为研究对象，对其质构、色泽、水分含量、化学特性指标（总酚含量、总黄酮含量和还原糖含量）及化学元素组成进行分析。结果表明：不同产地紫皮洋葱的水分含量、pH值、质构特性均无显著差异；可溶性固形物、总酚、总黄酮、还原糖含量及化学元素组成差异显著，其中河北所产紫皮洋葱的色泽较为鲜亮，可溶性固形物含量最高，化学元素含量最丰富，云南紫皮洋葱的总酚、总黄酮含量最高，山东紫皮洋葱的还原糖含量最高。在不同产地紫皮洋葱中确定了25种化学元素为判别河北、山东、云南和甘肃紫皮洋葱的化学元素标记物。河北紫皮洋葱的外观品相好，食用品质高，营养价值丰富，而云南紫皮洋葱的药用价值较高。

from Different Geographical Origins

In order to clarify the nutritional composition of purple skin onions from different geographical origins and identify characteristic components that contribute significantly to the identification of production areas, purple skin onions from four geographical origins of Hebei, Shandong, Yunnan, and Gansu were studied for their texture, color, water content, chemical characteristic indicators (total phenol content, total flavonoid content, and reducing sugar content),and chemical element composition. The results showed that, there were no significant differences in water content, pH value and texture characteristics of purple skin onions from different geographical origins, but significant differences in soluble solids, total phenols, total flavonoids, reducing sugar contents and chemical element composition. Among them,purple skin onions from Hebei have a brighter color, the highest content of soluble solids and the richest content of chemical element. The contents of total phenols and flavonoids in Yunnan purple skin onions were the highest. The content of reducing sugar in Shandong purple skin onions were the highest. 25 chemical elements were identified as markers of purple skin onions from different geographical origins in Hebei, Shandong, Yunnan, and Gansu. Hebei purple skin onions have better appearance, high edible quality and rich nutritional value, while Yunnan purple skin onions have higher medicinal value.