Several types of oscillations in Belousov–Zhabotinskii reactions with amino acids as organic substrates

✍ Scribed by Hexing Li; Yeping Xu; Minghui Wang

• Publisher: John Wiley and Sons
• Year: 2002
• Tongue: English
• Weight: 142 KB
• Volume: 34
• Category: Article
• ISSN: 0538-8066
• DOI: 10.1002/kin.10064

✦ Synopsis

Abstract

Under batch‐reactor conditions, 7 amino acids were employed as organic substrates in Belousov–Zhabotinskii (BZ) oscillations. These amino acids displayed different types of oscillations. Aspartic acid exhibited the classical BZ oscillations owing to the formation of oxalacetic acid (an intermediate of Aspartic acid oxidation) which is easily brominated. Tyrosine exhibited the uncatalyzed BZ oscillations where the metal ion catalyst is not necessary. Cystine, alanine, glycine, and glutamic acid could give rise to sustained oscillations only in the presence of acetone as a coupled organic substrate to remove bromine via bromination, known as the mixed‐substrate BZ oscillations. Serine showed oscillations even in the absence of acetone though serine is not subjected to bromination. Obviously, this is a new kind of BZ type oscillations since no bromination occurred at all. The excess bromine is possibly removed through the reduction by serine and/or its intermediates. Addition of acetone induces the dual‐frequency oscillations. © 2002 Wiley Periodicals, Inc. Int J Chem Kinet 34: 405–410, 2002