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首页> 外文期刊>Journal of Agricultural and Food Chemistry >Phenolic Compounds and Antioxidant Activity of Kernels and Shells of Mexican Pecan (Carya illinoinensis)
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Phenolic Compounds and Antioxidant Activity of Kernels and Shells of Mexican Pecan (Carya illinoinensis)

机译：墨西哥山核桃（山核桃）的酚类化合物和仁和壳的抗氧化活性。

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摘要

The phenolic composition and antioxidant activity of pecan kernels and shells cultivated in three regions of the state of Chihuahua, Mexico, were analyzed. High concentrations of total extractable phenolics, flavonoids, and proanthocyanidins were found in kernels, and 5-20-fold higher concentrations were found in shells. Their concentrations were significantly affected by the growing region. Antioxidant activity was evaluated by ORAC, DPPH~·, HO~·, and ABTS scavenging (TAC) methods. Antioxidant activity was strongly correlated with the concentrations of phenolic compounds. A strong correlation existed among the results obtained using these four methods. Five individual phenolic compounds were positively identified and quantified in kernels: ellagic, gallic, protocatechuic, and p-hydroxybenzoic acids and catechin. Only ellagic and gallic acids could be identified in shells. Seven phenolic compounds were tentatively identified in kernels by means of MS and UV spectral comparison, namely, protocatechuic aldehyde, (epi)gallocatechin, one gallic acid-glucose conjugate, three ellagic acid derivatives, and valoneic acid dilactone.
机译：分析了在墨西哥奇瓦瓦州三个地区种植的山核桃仁和壳的酚类成分和抗氧化活性。在果仁中发现高浓度的总可提取酚，类黄酮和原花色素，而在壳中发现高浓度的5-20倍。它们的浓度受生长区域的影响很大。通过ORAC，DPPH〜·，HO〜·和ABTS清除（TAC）方法评估抗氧化活性。抗氧化活性与酚类化合物的浓度密切相关。使用这四种方法获得的结果之间存在很强的相关性。五种单独的酚类化合物在果仁中得到了肯定的鉴定和定量：鞣花酸，没食子酸，原儿茶酸和对羟基苯甲酸和儿茶素。壳中只能鉴定鞣花酸和没食子酸。通过MS和UV光谱比较，初步确定了谷粒中的七个酚类化合物，即原儿茶醛，（epi）gallocatechin，一种没食子酸-葡萄糖结合物，三种鞣花酸衍生物和瓦洛尼酸双内酯。

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