Variations in Volatile Oil Yield and Composition of “Xin-yi” (<i>Magnolia biondii</i> Pamp. Flower Buds) at Different Growth Stages

Dried flower buds of Magnolia biondii Pamp. are the main ingredient in “Xin-yi” in China, and the volatile oils of M. biondii flower buds are the principal medicinal component. Gas chromatographymass spectrometry (GC–MS) and microscopic techniques were employed to detect the volatile yields of M. biondii flowers at various growth stages. The volatile oil yields of M. biondii flowers differed significantly at different growth stages and were...