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Cellulose

, Volume 26, Issue 5, pp 3513–3528 | Cite as

Visual degumming process of ramie fiber using a microbial consortium RAMCD407

  • Kewei Mao
  • Honggao ChenEmail author
  • Hanghang Qi
  • Zidong Qiu
  • Li Zhang
  • Jiangang Zhou
Original Research
  • 193 Downloads

Abstract

Morphological changes and biochemical process of ramie retting by RAMCD407 was investigated using microscopy techniques, including OM, PLM, FLSM and SEM coupled with enzyme activity analysis. Results showed that retting was completed within 56 h followed by 0.2% NaOH treatment. Residual gum content and breaking strength of the final fiber was 2.84% and 5.2 cN/dtex, respectively. This fulfills the requirement for ramie spinning. Retting included four main processes: water absorption and CCCO formation; cortex removal; removal of gum in the middle lamella; and removal of gum on the surface of fiber. The first two processes were completed under low enzyme activity condition, while the third process was related to higher pectinase enzyme activity and the last process was related to higher enzyme activities of pectinase and xylanase. In fact, only a small fraction of hemicellulose and pectin is required to be hydrolyzed to ensure fiber separation. In this process, pectinase played a key role supported by xylanase. Valuable retting residues, such as pectinase crystals, pectin blocks, xylan chips and microcrystalline cellulose was recovered from residual liquor by filtration and/or centrifugation. Reuse of these waste residues can help increase the overall economic benefit for ramie industries. The occurrence of spherical balls with double shell structure was found in retting process, and FLSM showed that the outer shell was composed of xylan-rich material. Compared to traditional chemical degumming methods, ramie retting by RAMCD407 is an eco-friendly degumming technique.

Graphical abstract

Keywords

Ramie fiber Bio-degumming Morphological change Biochemical process Retting waste Recovery and reuse 

Abbreviations

OM

Ordinary light microscope

PLM

Polarized light microscope

FLSM

Fluorescence microscope

SEM

Scanning electron microscope

CCCO

Cluster crystals of calcium oxalate

FT-IR

Fourier transform infrared

Notes

Acknowledgments

This work was financially supported by National Key Technology Research and Development Program of the Ministry of Science and Technology of China (Grant Nos. 2010BAD02B04, 2012BAD36B03-04). The authors wish to express their gratitude to “Collaborative Innovation Plan of Hubei Province for Key Technology of Eco-Ramie Industry”.

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Copyright information

© Springer Nature B.V. 2019

Authors and Affiliations

  • Kewei Mao
    • 1
  • Honggao Chen
    • 1
    • 2
    Email author
  • Hanghang Qi
    • 1
  • Zidong Qiu
    • 1
  • Li Zhang
    • 3
  • Jiangang Zhou
    • 1
    • 2
  1. 1.Environmental Engineering CollegeWuhan Textile UniversityWuhanChina
  2. 2.Engineering Research Centre for Clean Production of Textile Dyeing and Printing, Ministry of EducationWuhan Textile UniversityWuhanChina
  3. 3.Library of Wuhan Textile UniversityWuhan Textile UniversityWuhanChina

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