Cannabis resin in the region of Madrid: Adulteration and contamination
2019
Pérez-Moreno, M. | Pérez-Lloret, P. | González-Soriano, J. | Santos-Álvarez, I.
The aim of this study is to analyze the adulteration and contamination of cannabis resin obtained on the streets of Madrid, in order to establish whether it is suitable for human consumption. A total of 90 samples obtained through street vending in the Region of Madrid (CAM) were analyzed. Our results showed a direct relationship between the shape of the samples (acorn or ingot) and the presence of foreign elements, adulterants and microbiological contamination. Foreign elements were found in 64.7% of the ingot-shaped samples and in 30.2% of the acorn-shaped samples (p < 0.01); 25% of the samples were deliberately adulterated, 66.7% of which had an ingot shape. With regard to microbiological contamination, 93% of acorns were contaminated by E. coli, compared to 29.4% of ingots (p < 0.0001). In addition, all samples with fecal odor were acorns and were contaminated by E. coli. Ten per cent of the samples were contaminated by Aspergillus; of these, 66.7% had the shape of an acorn. Overall, our results showed that most (88.3%) of the hashish samples were not suitable for consumption. This percentage was significantly higher (p < 0.0001) in acorn than in ingot samples (100% vs. 58.8%). Hence, illegal street vending of hashish constitutes a public health issue.
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