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Microbiological quality evaluation of medicinal plants is an important aspect to provide user safety. In Brazil, the legislation mentions microbiological contamination research. The aim of this study was to evaluate the microbial load of medicinal plants in home gardens in one of the city districts of Ponta Grossa, Parana. The study showed the presence of mesophilic aerobic bacteria inall samples with a load ranging from 6.3 to 2.32 x102 x105 CFU / g. In 73% of the plants it was detected the presence of total coliform; and in 27% of the plants the presence of coliform 134 Nhara Soraya Paganela Marcones; Luís Antônio Esmerino Publ. UEPG Biol. Health Sci., Ponta Grossa, v.16, n. 2, p. 133-138, jul./dez. 2010 45°C. Heat treatment simulating the preparation of an infusion or tea signifi cantly reduced (p<0.0001) this contamination with counts ranging from 3.4 to 2.5 X101 x103 CFU / g. However, in 18% of the samples this reduction was not satisfactory and the microbial load was higher than that permitted in the current legislation (1.0 x103) for oral use. However, these samples did not present coliform 45°C. The data demonstrate and reinforce the need for education and guidance in the use of medicinal plants so that microbial contamination can be reduced and not pose a risk for health.

QUALIDADE MICROBIOLÓGICA DE PLANTAS MEDICINAIS CULTIVADAS EM HORTAS DOMÉSTICAS