BACKGROUND Baizhi (Angelica dahurica) has been widely used as a traditional Chinese herbal medicine, functional food and cosmetic product ingredient, mostly because of the high furanocoumarin compounds in roots. The cropping system of Baizhi with its unique summer dormancy feature, is easily affected by the transition of its growth stages. The aim of this study was to analyze the quantity (size, form and dry weight [DW]) and quality (antioxidant and furanocoumarin content) of taproot and lateral root from three growth stages of Baizhi; vegetative (V-stage), summer dormancy (S-stage) and bolting stage (B-stage). RESULTS Root length and diameter were lower at V-stage than the other two stages, and S-stage had higher lateral root to total root ratio. However, the highest root DW was observed at S-stage. Antioxidant activity was revealed by 2,2-diphenyl-L-picrylhydrazyl and Fe2+ chelating assay, and the content of six furanocoumarin compounds, including xanthotoxin, bergapten, oxypeucedanin, imperatorin, phellopterin and isoimperatorin, was analyzed by liquid chromatography. Although the antioxidant activity was less at S-stage than the other stages, furanocoumarin contents showed little variation. CONCLUSION Considering the high DW and stable furanocoumarin composition, S-stage is the best harvest stage than the other stages because of its richer total pharmacological content.

中文翻译：

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收获期对当归药理作用的影响。

背景技术百芝（Angelica dahurica）已被广泛用作中草药，功能性食品和化妆品成分，主要是因为其根中的呋喃香豆素含量很高。百芝具有独特的夏季休眠特征的农作物系统很容易受到其生长期过渡的影响。这项研究的目的是分析百芝三个生长阶段的主根和侧根的数量（大小，形式和干重[DW]）和质量（抗氧化剂和呋喃香豆素含量）。营养期（V期），夏季休眠期（S期）和抽ing期（B期）。结果V期的根长和直径均低于其他两个阶段，而S期的侧根与总根之比更高。然而，在S期观察到最高的根DW。2显示出抗氧化活性 用液相色谱法分析了2-二苯基-L-甲基水合肼和Fe2 +的螯合分析，以及黄嘌呤毒素，佛手柑，氧皮丹宁，欧前胡素，蝶呤和异欧前胡素等六种呋喃香豆素化合物的含量。尽管在S阶段抗氧化剂活性比其他阶段低，但呋喃香豆素含量几乎没有变化。结论考虑到高DW和稳定的呋喃香豆素组成，S期是最理想的收获期，因为它具有更丰富的总药理含量。呋喃香豆素含量几乎没有变化。结论考虑到高DW和稳定的呋喃香豆素成分，S期是最佳收获期，因为它的总药理含量更高。呋喃香豆素含量几乎没有变化。结论考虑到高DW和稳定的呋喃香豆素组成，S期是最理想的收获期，因为它具有更丰富的总药理含量。