Packaging and Storage Effects on Microbiological Quality of Dried Herbs


  • This study waas supported by the National Research Council for Agriculture and Forestry of Finland and by the Ministry of Agriculture and Forestry of Finland.


Two hundred herb samples were investigated for microbiological quality. Effects of drying method, type package, and storage conditions were determined for dill, basil, marjoram, and wild marjoram. Total aerobic count ranged from 104 to 107/g dried material. Molds and aerobic sporeformers, especially Bacillus cereus, were detected in most samples; fecal indicator organisms were found infrequently. The number of most vegetative microbes was affected by the drying method. Microbes survived air-drying better than freeze-drying. Packaging affected microbial content. The lethal effect of storage time was most clearly shown when the herbs were packed in oxygen-containing packages.