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MICROBIOLOGICAL TESTING AND PHYSICAL AND CHEMICAL ANALYSIS OF RECONSTITUTED FRUIT JUICES AND COCONUT WATER

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Author(s): Fernanda Barbosa PILÓ | Natália Oliveira PEREIRA | Larissa Falabella Daher DE FREITAS | Alessandra Nunes Duarte MIRANDA | Luiz Simeão do CARMO | Fátima De Cássia Oliveira GOMES | Regina Maria Drummond NARDI | Carlos Augusto ROSA

Journal: Alimentos e Nutrição
ISSN 0103-4235

Volume: 20;
Issue: 4;
Date: 2010;
Original page

Keywords: Juice powders | coconut water | microbiological quality | physicochemical parameters.

ABSTRACT
The aim of this study was to assess the quality of reconstituted fruit juices and coconut water sold for immediate consumption in bars, restaurants and bakeries, and by street vendors in Belo Horizonte (Minas Gerais, Brazil). Microbial quality was determined by counting coliforms, yeasts, staphylococci and salmonellae. Total titratable acidity, pH and total soluble solids of these beverages were recorded. For coconut water samples, the total reducing sugar content was also determined. The “juices” collected included reconstituted orange, cashew and grape-fl avored juice powders and concentrated cashew juice. Sixty samples of these juices and 45 of coconut water were collected. More than half (55%) of the juice samples did not comply with current Brazilian legislation, which states that there must be a total absence of coliforms in a 50 mL sample. Sixteen percent of the coconut water samples exceeded the bacterial count limits defi ned in Brazilian law, with thermotolerant coliform densities above 102 MPN / mL. The high levels of sugar and low pH found in the coconut water were possibly related to the high yeast counts in most samples. Forty-seven percent of coconut water samples showed staphylococcal counts above 103 CFU/mL. The numbers of thermotolerant coliforms, yeasts and staphylococci found suggest unsatisfactory hygienic practices during the preparation of these beverages. Salmonellae were not detected in any of the samples. The physical and chemical properties of the drinks varied among the samples. Our results suggest that both the reconstituted juices and coconut waters need better hygienic and sanitary control.
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