Part 4: Quality Testing—Microbial Testing

Microbial testing involves analyzing a batch of essential oils for the presence of bio-hazardous microorganisms such as fungi, bacteria, viruses, and mold. The process involves drawing a sample from a batch of essential oils and then adding that sample to a sterile growth medium in an enclosed dish or plate. The sample is incubated for a designated period of time and then observed for any microbial growth. This test is performed upon entering the manufacturing facility and also on the finished product before distribution to customers to ensure that the product has not been contaminated during the filling or labeling process.