Dual-frequency oscillations induced by acidity in Belousov-Zhabotinskii reactions with aldosugars as substrates

Article abstract of DOI:10.1016/S0009-2614(97)00662-3

Depending on the initial concentration of H₂SO₄, two types of dual-frequency oscillations have been observed in Belousov-Zhabotinskii type reactions catalyzed by Mn²⁺ with acetone and aldosugars (arabinose, glucose, galactose, lactose or maltose) as coupled substrates in a batch reactor. No such dual-frequency oscillations have been found when a ketosugar like fructose was used instead of an aldosugar as the substrate; or acetone was replaced by N₂ flow. No oscillations were observed when Ce³⁺ was used instead of Mn²⁺. The reaction products of aldosugars in different oscillating regimes have been analyzed. The dual-frequency oscillatory patterns have been discussed according to the roles of the substrates and their derivatives formed at different acidity.