Environmentally friendly pretreatment of plant biomass by planetary and attrition milling

Hyeon Jeong Kim, Siseon Lee, Jungbae Kim, Robert J. Mitchell, Jin Hyung Lee

Research output: Contribution to journalArticlepeer-review

48 Citations (Scopus)


This study evaluated the use of planetary and attrition milling as pretreatment processes for lignocellulosic biomass using rice straw. Planetary milling reduced the rice straw crystallinity from 0.48 to 0.11. Since the samples could be milled and enzymatically treated using the same media, loss of the biomass due to washing was effectively eliminated. In contrast, conventional sodium hydroxide and soaking in aqueous ammonia (SAA) processes showed a loss of 34.2% and 14.8%, respectively. Furthermore, milling produced significantly lower concentrations of soluble phenolics than the alkali treatments. Using a bioluminescent bioreporter strain that is sensitive to these phenolics, neither of the milled samples elicited a response while the sodium hydroxide and SAA samples led to a 25.8 and 4.7 -fold induction, respectively. Although planetary milling produced more reducing sugars than attrition milling before saccharification, both had similar monosaccharide yields, i.e., 0.38 and 0.34. g/g-biomass, respectively, when 40. g/l rice straw was treated.

Original languageEnglish
Pages (from-to)50-56
Number of pages7
JournalBioresource technology
Publication statusPublished - 2013 Sept

Bibliographical note

Funding Information:
This work was supported by a grant from the Small & Medium Business Adminstration (Grant # SV122713 ), Republic of Korea. The authors gratefully acknowledge the financial support.


  • Attrition milling
  • Lignocellulosic biomass
  • Planetary milling
  • Pretreatment
  • Rice straw

ASJC Scopus subject areas

  • Bioengineering
  • Environmental Engineering
  • Renewable Energy, Sustainability and the Environment
  • Waste Management and Disposal


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