Sulfonated carbon-catalyzed deamination of alanine under hydrothermal conditions

Qingxin Zheng, Takuma Kato, Yuko Ito, Masayoshi Wagatsuma, Yuya Hiraga, Masaru Watanabe

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3 Citations (Scopus)


Here, the catalytic effects of sixteen types of solid acid/base additives on the deamination of alanine under hydrothermal conditions at 90–150 °C were examined. As a result, porous sulfonated carbon (FCC-P) showed the highest catalytic activity, which was attributed to the high contents of multiple functional groups like sulfonyl and oxygen functional groups. Using FCC-P as the catalyst, the parameters including the additive amount and alanine solution concentration were optimized to be 0.5 g and ≥ 50 mmol/L, respectively, and the effects of temperature and time were studied detailedly. At 150 °C for 60 min, the deamination yield and alanine conversion achieved to 20.0% and 51.0%, respectively, with the production yield of ammonium at 7.6%. The reusability of two types of sulfonated carbon catalysts was examined. Finally, FCC-P was applied to amino acids including glycine, valine, leucine, and serine, and showed high catalytic activity for each hydrothermal deamination reaction.

Original languageEnglish
Article number105275
JournalJournal of Supercritical Fluids
Publication statusPublished - 2021 Sept


  • Alanine
  • Amino acid
  • Catalyst
  • Deamination
  • Hydrothermal
  • Sulfonated carbon


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