徳島大学 教育・研究者情報データベース(EDB)

1. 徳島大学.大学院ソシオテクノサイエンス研究部.ライフシステム部門.物質機能化学(〜2016年3月31日)

1. 鈴木 良尚([徳島大学.大学院社会産業理工学研究部.理工学域.応用化学系.物質機能化学分野]/[徳島大学.理工学部.理工学科.応用化学システムコース.物質機能化学講座])

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2. (英) Konda Emi / (日) 近田 恵美 / (読) こんだ えみ

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3. (英) Hondoh Hironori / (日) 本同 宏成 / (読) ほんどう ひろのり

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4. 田村 勝弘

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(英) Effects of temperature, pressure, and pH on the solubility of triclinic lysozyme crystals

(英) We measured the temperature dependence of the solubility, Ce, of triclinic lysozyme crystals on temperature at two pressures (0.1 and 100 MPa) and five pHs (4.3, 4.4, 4.5, 4.6, 4.7) by in situ observation of the morphological changes in the crystals. The solubility increased with increasing temperature and pressure. The enthalpies of dissolution (ΔH) decreased with increasing pressure when we used the same 50 mM sodium acetate buffer solution (pH = 4.5 at 0.1 MPa). The effects of pH on solubility were somehow complicated. Although the solubilities at pH 4.7 did not differ from those at pH 4.5, those at pH 4.3 were significantly larger than those at pH 4.5. Since the pH of an acetate buffer is known to decrease from 4.71 to 4.52 at 98.1 MPa and 25 ºC [El'yanov et al. Aust. J. Chem. 28 (1975) 933], the pH of the acetate buffer (pH 4.5 at 0.1 MPa) decreased to pH ~ 4.3 as pressure increased to 100 MPa. Thus, from the viewpoint of ``constant pH'', ΔH increased with increasing pressure, since ΔH at pH 4.3 and 0.1 MPa was smaller than that at 100 MPa. This inconsistency is probably due to the change in the hydration state in the crystal and solution with decreasing pH (from 4.5 to 4.3).

1. 結晶成長(crystal growth)