Fig. 6.

The effect of oxygen absorbers, silica gel and P. sativum seeds on the detection of acetic acid (a), acetone (b), ethanol (c), methanol (d), 2-propanol (e) and acetaldehyde (f) in the headspace of 20 mL vials containing 0.6 μmol acetic acid, 90 nmol acetone, 1.25 μmol ethanol, 3 μmol methanol, 0.85 μmol 2-propanol, or 40 nmol acetaldehyde. Vials either contained only the volatile compound (control), or the volatile compound in addition to an O₂ absorbing sachet (O₂ ab.), a silica gel sachet (Si; equilibrated to 60% RH) or 1 g of A. githago, L. perenne or P. sativum seeds that had been equilibrated to 60% RH. All vials were incubated at 50 °C for 10 d. Bars represent the mean volatile emission ± SE. (n = 3). Asterisks denote significant differences (P < 0.05) in volatile abundance between the control vials and those containing O₂ absorbers, silica or P. sativum seeds determined using one-way ANOVA and a post hoc Dunnett’s test