Journal
JOURNAL OF PHYSICAL CHEMISTRY B
Volume 114, Issue 44, Pages 14059-14063Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp106532d
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Funding
- National Science Foundation [CHE-0719099]
- China Scholarship Council
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The bell-shaped rate-pH curve coupled to production of base in the urea-urease reaction was utilized to give feedback-driven behavior: an acid-to-base pH clock (a kinetic switch), bistability and hysteresis between an acid/base state when the initial pH was adjusted by a strong acid, and aperiodic pH oscillations when the initial pH was adjusted by a weak acid in an open reactor. A simple model of the reaction reproduced most of the experimental results and provided insight into the role of self-buffering in the dynamics. This reaction suggests new possibilities in the development of biocompatible feedback to couple to pH-sensitive processes for bioinspired applications in medicine, engineering, or materials science.
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