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Chemistry and Industry of Forest Products ›› 2022, Vol. 42 ›› Issue (2): 25-30.doi: 10.3969/j.issn.0253-2417.2022.02.004

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Cell Morphology and Chemical Composition of Deseeded Sunflower Studied by Fractional Method

Lizhen WANG1,2, Junyue WANG3, Hao REN1, Huamin ZHAI1,*()   

  1. 1. Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forestry Resources, Nanjing Forestry University, Nanjing 210037, China
    2. College of Light Industry and Textile, Inner Mongolia University of Technology, Hohhot 010080, China
    3. College of Mechanical and Electrical Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China
  • Received:2021-02-01 Online:2022-04-28 Published:2022-05-06
  • Contact: Huamin ZHAI E-mail:hzhai@njfu.edu.cn

Abstract:

The cell morphology and chemical composition of deseeded sunflower were studied by fractional method. The deseeded sunflower could be divided into seven fractions, namely, stalk rind, pith, receptacle, bract, bractlet, petiole and leaf blade. The weight percentage of stalk rind and receptacle were 49.4% and 28.1%, and the other fractions ranged from 3.4% to 5.9% respectively. The pith consisted only of parenchyma cells, while the other fractions consisted of epidermal cells, fibers cells, parenchyma cells, and vessel elements. The fiber volume percentage of stalk rind was 68.4% and the aspect ratio of stalk rind was the largest(38.6) and the stalk rind could be used as the raw material for papermaking. The other fractions were mostly parenchyma cells, and the volume percentage of fine fiber was more than 50%.The holocellulose weight percentages in stalk rind and bractlet were 65.7% and 58.6%, the pentosan weight percentages were 22.2% and 22.5%, and the lignin weight percentages were 22.7% and 16.2%, respectively. The stalk rind and bractlet could be used as biomass raw material of lignocellulosic, and the stalk rind could be used as papermaking raw material. The hot water extractive weight percentages ranged from 26.1% to 50.8% and the benzene-alcohol extractive contents ranged from 3.5% to 8.7% in the stalk pith, receptacles, bracts, petioles and leaf blades, which were needed for further research. The biological structure and chemical composition of each fraction were highly heterogeneous, and the deseeded sunflower fraction processing was its high value-added utilization method.

Key words: deseeded sunflower, fractions, cell morphology, chemical composition, heterogeneous

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