Shen Danyu, Wu Shutian, Zheng Yuewen, Han Yongxiang, Ni Zhanglin, Li Shiliang, Tang Fubin, Mo Runhong, Liu Yihua
Research Institute of Subtropical Forestry, Chinese Academy of Forestry, Fuyang, 311400 People's Republic of China.
Nanjing Forestry University, Nanjing, 210037 People's Republic of China.
J Food Sci Technol. 2021 Apr;58(4):1358-1367. doi: 10.1007/s13197-020-04647-4. Epub 2020 Jul 16.
Little is known about the phytochemical composition of iron walnuts. Differences in the geographical origin of iron walnuts associated with economic benefits should also be examined. In this study, the phytochemical composition (fatty acids, Vitamin E, total polyphenols and flavonoids, amino acids, and minerals) of iron walnuts in China was investigated. The results showed that there were significant differences ( < 0.05) in the phytochemical composition of iron walnut oils and flours from different regions. Positive (r > 0.5, < 0.05) and negative (r < - 0.5, < 0.05) correlations were found between amino acids/minerals and amino acids/oleic acid, with the highest correlation coefficient (r = 0.742, < 0.05) between Cu and tyrosine. In addition, based on the 12 phytochemical fingerprints selected by random forest, a geographical-origin identification model for iron walnuts was established, with a corresponding correct classification rate of 96.6%. The top three phytochemical fingerprints for the geographical-origin identification of iron walnut were microelements, macroelements, and antioxidant composition, with contribution rates of 61.7%, 18.1%, and 9.9%, respectively.
关于铁核桃的植物化学成分知之甚少。还应研究与经济效益相关的铁核桃地理来源差异。在本研究中，对中国铁核桃的植物化学成分（脂肪酸、维生素E、总多酚和黄酮类化合物、氨基酸和矿物质）进行了研究。结果表明，不同地区铁核桃油和面粉的植物化学成分存在显著差异（<0.05）。氨基酸/矿物质与氨基酸/油酸之间存在正相关（r>0.5，<0.05）和负相关（r<-0.5，<0.05），其中铜与酪氨酸之间的相关系数最高（r=0.742，<0.05）。此外，基于随机森林选择的12个植物化学指纹图谱，建立了铁核桃地理来源识别模型，相应的正确分类率为96.6%。用于铁核桃地理来源识别的前三个植物化学指纹图谱是微量元素、常量元素和抗氧化成分，贡献率分别为61.7%、18.1%和9.9%。
