Acid Hydrolysis of Protein in a Microcapillary Tube for the Recovery of Tryptophan

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  • ADEBIYI Abayomi Peter
    Department of Biomolecular Science, Graduate School of Life Sciences, Tohoku University
  • JIN Dong-Hao
    Department of Biomolecular Science, Graduate School of Life Sciences, Tohoku University
  • OGAWA Tomohisa
    Department of Biomolecular Science, Graduate School of Life Sciences, Tohoku University
  • MURAMOTO Koji
    Department of Biomolecular Science, Graduate School of Life Sciences, Tohoku University

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説明

The acid hydrolysis of proteins was miniaturized and simplified by employing microcapillary tubes (100 μl in volume) with 6 M HCl containing 1% 2-mercaptoethanol and 3% phenol for an amino acid compositional analysis. The method not only eliminated the laborious evacuation step for the hydrolysis tube but also decreased the destruction of tryptophan during hydrolysis. The recovery of tryptophan was 79% by acid hydrolysis at 145 °C for 4 h. Since the acid mixture could be removed under vacuum, the hydrolysate was subjected to an amino acid analysis without neutralization or dilution.

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