Citrinin Accumulation Under Stress of Camphore and Blue-Gum Extract

The effect of camphore and the aqueous leaves extract of blue-gum (Eucalyptus globulus L.) on the growth of Aspergillus terreus var. aureus and the formation of citrinin was studied. The low levels 0.05 and 0.5% of camphore and leaves extract, respectively, were found to be the most effective on citrinin synthesis during all periods of incubation. The high level of camphore (0.5%) inhibited the mycelial growth and citrinin production after 5 days of incubation. However, after 10 and 15 days of incubation, citrinin increased, but was still below the control level. In replacement culture, camphore increased citrinin accumulation with rise in respiration. There was no increase in citrinin accumulation at a defined level of stress and this depended on the pre-grown mycelia and condition of their incubation.