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Article| Volume 83, ISSUE 4, P666-673, April 2000

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Probiotic Culture Survival and Implications in Fermented Frozen Yogurt Characteristics

Open ArchiveDOI:https://doi.org/10.3168/jds.S0022-0302(00)74927-7
Probiotic Culture Survival and Implications in Fermented Frozen Yogurt Characteristics
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      Abstract

      Low-fat ice cream mix was fermented with probiotic-supplemented and traditional starter culture systems and evaluated for culture survival, composition, and sensory characteristics of frozen product. Fermentations were stopped when the titratable acidity reached 0.15% greater than the initial titratable acidity (end point 1) or when the pH reached 5.6 (end point 2). Mix was frozen and stored for 11 wk at –20°C. The traditional yogurt culture system contained the strains Streptococcus salivarius ssp. thermophilus and Lactobacillus delbrueckii ssp. bulgaricus. The probiotic-supplemented system contained the traditional cultures as well as Bifidobacterium longum and Lactobacillus acidophilus. We compared recovery of Bifodobacterium by three methods, a repair-detection system with roll-tubes and plates on modified bifid glucose medium and plates with maltose + galactose reinforced clostridial medium.
      Culture bacteria in both systems did not decrease in the yogurt during frozen storage. The roll-tube method with modified bifid glucose agar and repair detection system provided at least one-half log10 cfu/ml higher recovery of B. longum compared with recoveries using modified bifid glucose agar or maltose + galactose reinforced clostridial agar on petri plates. No change in concentrations of lactose or protein for products fermented with either culture system occurred during storage. Acid flavor was more intense when product was fermented to pH 5.6, but yogurt flavor was not intensified. The presence of probiotic bacteria in the supplemented system seemed to cause no differences in protein and lactose concentration and sensory characteristics.

      Key words

      Abbreviation Key:

      MBGA (modified bifid glucose agar), MGRCA (maltose + glucose reinforced clostridial medium)

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      Article info

      Publication history

      Accepted: October 26, 1999
      Received: July 12, 1999

      Identification

      DOI: https://doi.org/10.3168/jds.S0022-0302(00)74927-7

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      © 2000 American Dairy Science Association. Published by Elsevier Inc.

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