Validation of the Soleris®Enterobacteriaceae Method for Detection of Enterobacteriaceae in Dried Cannabis Flower: AOAC Performance Tested MethodSM 121901.

BACKGROUND

The Soleris®Enterobacteriaceae vial is a growth-based, automated method for detection of bacteria of the family Enterobacteriaceae in foods and other sample types including nutraceuticals and cosmetics. The Soleris method is used in a "dilute-to-specification" or threshold manner, in which a result is scored as positive or negative around a predetermined cutoff (in CFU/g) established by the dilution and volume of sample homogenate tested. The Soleris method was granted AOAC Performance Tested MethodSM (PTM) status for select foods after successful completion of a validation study (PTM 121901).

OBJECTIVE

The objective of this study was to validate the method for the detection of Enterobacteriaceae in dried cannabis flower [>0.3% delta-9-tetrahydrocannabinol (THC)].

METHODS

The matrix study included comparison of Soleris method presumptive results to confirmation from the Soleris vials, and comparison of the Soleris confirmed results to those of the ISO 21528-2:2017 colony count method. Test materials at four different levels of contamination ranging from 7.8 to 3500 CFU/g were tested at three dilutions, corresponding to test thresholds.

RESULTS

Probability of detection analysis at P < 0.05 showed there were no significant differences between Soleris presumptive and confirmed results, and no significant differences between Soleris confirmed and ISO 21528-2:2017 results.

CONCLUSION

The results provided evidence that the Soleris Enterobacteriaceae test is an accurate method for detection of Enterobacteriaceae in dried cannabis flower.

HIGHLIGHTS: The Soleris Enterobacteriaceae method provides cannabis industry QC personnel with an effective method for analysis of dried cannabis flower and produces results in 20-24 h.