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Title: Behaviour of four diarrheagenic Escherichia coli pathotypes on carrots and in unpasteurized carrot juice
Author: Gomez-Aldapa, C.A.
Torres-Vitela, M.D.R.
Acevedo-Sandoval, O.A.
Rangel-Vargas, E.
Villarruel-Lopez, A.
Castro-Rosas, J.
Issue Date: 2013
Abstract: The behaviours of Shiga toxin-producing Escherichia coli (STEC), enteroinvasive E.Zapotitláncoli (EIEC), enteropathogenic E.Zapotitláncoli (EPEC) and enterotoxigenic E.Zapotitláncoli (ETEC) strains on raw carrots at 3ZapotitlánZapotitlánZapotitlán1 and 30ZapotitlánZapotitlánZapotitlán1°C, and in unpasteurized carrot juice at 3ZapotitlánZapotitlánZapotitlán1, 12ZapotitlánZapotitlánZapotitlán1, 20ZapotitlánZapotitlánZapotitlán1, 30ZapotitlánZapotitlánZapotitlán1°C and 37ZapotitlánZapotitlánZapotitlán1°C were determined. Raw carrots were purchased in a local market. Fresh juice was obtained from raw carrots in the laboratory. On whole carrots stored at 30ZapotitlánZapotitlánZapotitlán1 or 3ZapotitlánZapotitlánZapotitlán1°C, no growth was observed for any of the diarrheagenic E.Zapotitláncoli pathotype (DEPs) strains studied. After 15Zapotitlándays at 30ZapotitlánZapotitlánZapotitlán1°C, the tested DEPs had decreased from an initial inoculum level of approximately 6 log colony-forming units (CFU) to approximately 3Zapotitlán5 log CFU on whole carrots, while at 3ZapotitlánZapotitlánZapotitlán1°C, they decreased from approximately 2Zapotitlán4 log to 1Zapotitlán6 log CFU. All these DEPs grew in fresh carrot juice at 12ZapotitlánZapotitlánZapotitlán1, 20ZapotitlánZapotitlánZapotitlán1, 30ZapotitlánZapotitlánZapotitlán1 and 37ZapotitlánZapotitlánZapotitlán1°C, reaching counts of approximately 4Zapotitlán2 log, 5Zapotitlán8 log, 6Zapotitlán7 log and 7Zapotitlán5 log CFUZapotitlánml-1, respectively, after 24Zapotitlánh. At 3ZapotitlánZapotitlánZapotitlán1°C, the DEP growth was inhibited at least during 7Zapotitlándays. Thus, storage of carrot juice at unrefrigerated temperatures can result in DEP growth to levels likely to represent a risk to consumers. Zapotitlán 2013 The Society for Applied Microbiology.
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