Determinación microbiológica y de metales pesados en berro (Nasturtium officinale R. Br.) expendido en los diferentes mercados del Distrito Metropolitano de Quito.
Watercress is a vegetable whose consumption has been increasing over time in the Ecuadorian highlands, because of its high nutritional value. According to studies from other countries, watercress is highly susceptible to bacteria, parasites and heavy metals accumulate. In this investigation it...
| Autor Principal: | Cabascango Cabezas, Sandy Andrea |
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| Formato: | bachelorThesis |
| Idioma: | spa |
| Publicado: |
2016
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| Materias: | |
| Acceso en línea: |
http://dspace.ups.edu.ec/handle/123456789/12149 |
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| Sumario: |
Watercress is a vegetable whose consumption has been increasing over time in the
Ecuadorian highlands, because of its high nutritional value. According to studies from
other countries, watercress is highly susceptible to bacteria, parasites and heavy metals
accumulate. In this investigation it carried out microbiological and heavy metal
determination in watercress Nasturtium officinale R. Br. sold in 30 markets of the
Metropolitan District of Quito. Fresh samples were analyzed according to the color,
odor, size and weight of leaves (length: 9.51-18.62 cm, width: 3.02-7.61 cm and weight:
0.33-1.90 g). Then, it was performed the physicochemical characterization, where the
average value of all samples was: 92.78% moisture, 1.28% ash, 3.78 °Brix (soluble
solids), pH 6.78 and 0.07% titratable acidity (oxalic acid). Heavy metals analyzed were
lead and cadmium; these were within the maximum level of concentration in leafy
vegetables established by CODEX, while CFU/g (Colony-Forming Units per gram) of
aerobic mesophilic bacteria in all samples exceeded the microbiological limits
established in the regulations proposed by Moragas and De Pablo, except for one
market. Aerobic mesophilic bacteria were not correlated directly with the parameters
pH, moisture and ºBrix. In parasitology, all samples had at least a cyst and concluded
that watercress sold in Quito markets lacks health and it may be dangerous to human
health. |
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