Abstract
Ice cream is not considered to be a serious source of bacterial infection since it is a frozen food product, the greatest risk of contamination occurring during the processing stage. The aim of this study was to determine and evaluate the microbiological characteristics of diet strawberry ice cream formulations with the addition of whey protein concentrate (WPC), whole milk powder (MP) and sweeteners. The formulations were prepared in two stages: in the first stage ice cream samples were prepared with WPC and either stevia (F1), sucralose/acesulfame-K (F2), saccharin/cyclamate (F3) or fructose (F4) and with MP but without sweeteners (F5);and in the second stage ice cream with the addition of MP (F1-MP) or WPC (F2-WPC) with sucralose/acesulfame-K were prepared. The pasteurized milk, cream and ice cream were submitted to analysis to determine the counts for viable aerobic mesophylls, coliforms at 35 ºC and45ºC, psychrotrophic bacteria, coagulase-positive Staphylococcus aureus and molds and yeasts. A study on the presence of Salmonella spp. was also carried out. All of the analysis was carried out in triplicate. The pasteurized milk, cream and ice cream had good microbiological quality, indicating strict control during all processing stages, leading to a high quality product.
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