resumo
In this work, the extraction of a model enzyme alpha-chymotrypsin in its active conformation from an aqueous solution by using new biocompatible and self-buffering Good's buffer ionic liquids (GBILs)-based aqueous biphasic systems (ABSs) is demonstrated. The experimental liquid-liquid phase boundary data for these new GBIL-based ABSs were measured at 298.2 K. These new ionic liquids are derived from biological Good's buffers as anions and tetra-alkylammonium as cations. The buffering potential of these GBILs was confirmed by measuring their pH profiles and protonation constants (pK(a)) in aqueous solution by a potentiometric method at various temperatures. Moreover, these GBILs provide a greater stabilizing effect on the activity of alpha-chymotrypsin, as compared with the corresponding Good's buffers. Therefore, the new self-buffering GBILs may not only serve as a biocompatible medium for enzymatic research, but also avoid the use of an external buffering agent, which is often needed for pH control in the case of using a conventional ILs-based medium. Therefore, these new biocompatible GBILs are more advantageous over the conventional ILs-based media for enzymatic research.
palavras-chave
AQUEOUS BIPHASIC SYSTEMS; ALPHA-CHYMOTRYPSIN; BIOLOGICAL BUFFERS; DIRECT ELECTROCHEMISTRY; CARBON NANOTUBES; PH BUFFERS; SOLVENTS; CATALYSIS; AGGREGATION; EQUILIBRIA
categoria
Chemistry
autores
Gupta, BS; Taha, M; Lee, MJ
nossos autores
Grupos
agradecimentos
The authors gratefully acknowledge the financial support from Ministry of Science & Technology, Taiwan, through NSC102-2811-E011-014 and NSC 102-2221-E011-137-MY3.