title: [Study on accumulation of polysaccharides and alcohol-soluble extracts contents of Dendrobium officinale leaves].
abstract: This paper revealed the accumulation regularity of polysaccharides and alcohol-soluble extracts contents of Dendrobium officinale leaves, which have provided basis for the development and utilization of the leaves. The polysaccharides and alcohol-soluble extracts contents of three D. officinale strains leaves collected in different growing periods were determined by phenol-sulfric acid method and hot-dip method respectively. The results showed that the content of polysaccharides in leaves was 4.45% -12.17%, and was about a quarter in stems. The alcohol-soluble extracts content in leaves was 7.45% - 29.34%, and was 1.5 times that of stems. The quality variation of polysaccharides in leaves was closely related to the phenophase. The leaves with lower level of metabolism in three stages: winter, early germination stage and deciduous period, which led to lower content of polysaccharides. The leaves at the vigorous growth stage with higher content of polysaccharides. The alcohol-soluble extracts were closely associated to the formation and germination of buds. The content of alcohol-soluble extracts peaked before sprout, and promoted the growth of new shoots.
authors.forename: Zhen-peng
authors.initials: ZP
authors.lastname: Liu
authors.forename: Cui-xia
authors.initials: CX
authors.lastname: Xu
authors.forename: Jing-jing
authors.initials: JJ
authors.lastname: Liu
authors.forename: Jin-ping
authors.initials: JP
authors.lastname: Si
authors.forename: Xin-feng
authors.initials: XF
authors.lastname: Zhang
authors.forename: Ling-shang
authors.initials: LS
authors.lastname: Wu
mesh_terms: D031667:Dendrobium / Q000737:chemistry* / Q000378:metabolism; D004365:Drugs, Chinese Herbal / Q000032:analysis / Q000378:metabolism*; D018515:Plant Leaves / Q000737:chemistry / Q000378:metabolism; D011134:Polysaccharides / Q000032:analysis / Q000378:metabolism*; D012621:Seasons
chemical_list: D004365:Drugs, Chinese Herbal; D011134:Polysaccharides