Adding 0.1 M metal ions in the ribose/alanine model, except for
zinc sulphate, decreased furan concentration to 59.13 ± 1.83 ng/ml
with iron sulphate, 99.69 ± 1.92 ng/ml with magnesium sulphate,
and 91.64 ± 3.84 ng/ml with calcium sulphate, respectively. In contrast,
furan increased to 239.6 ± 7.02 ng/ml with zinc sulphate.