Suitability of Bifidobacterium spp. and Lactobacillus plantarum as probiotics intended for fruit juices containing citrus extracts.
A strain of Lactobacillus plantarum and 4 strains of bifidobacteria were inoculated in apple juice and in a commercial beverage labeled as "red-fruit juice," containing citrus extracts as natural preservatives; the suitability of the probiotics was evaluated in relation to their resistance to 2 kinds of citrus extracts (biocitro and lemon extract), survival in juices at 4 and 37 °C, and inhibition of Zygosaccharomyces bailii. Cell count of L. plantarum and bifidobacteria over time was fitted through the Weibull equation, for the evaluation of the first reduction time (δ), death time, and microbiological shelf life (the break-point was set to 7 log cfu/mL). Bifidobacterium animalis subsp. lactis experienced the highest δ-value (23.21 d) and death time (96.59 d) in the red-fruit juice at 4 °C, whereas L. plantarum was the most promising strain in apple juice at 37 °C. Biocitro and lemon extract did not exert a biocidal effect toward probiotics; moreover, the probiotics controlled the growth of Z. bailii and the combination of L. plantarum with 40 ppm of biocitro reduced the level of the yeast after 18 d by 2 log cfu/mL.
Dept. of the Science of Agriculture, Food and Environment, Univ. of Foggia, Foggia, Italy.
Antonio
A
Bevilacqua
Daniela
D
Campaniello
Maria Rosaria
MR
Corbo
Lucia
L
Maddalena
Milena
M
Sinigaglia
D001628:Beverages / Q000032:analysis* / Q000382:microbiology; D001644:Bifidobacterium / Q000254:growth & development*; D002957:Citrus / Q000737:chemistry*; D005506:Food Contamination / Q000517:prevention & control; D005516:Food Microbiology; D005519:Food Preservation / Q000379:methods; D005638:Fruit / Q000382:microbiology; D048191:Lactiplantibacillus plantarum / Q000254:growth & development*; D050296:Microbial Viability; D010936:Plant Extracts / Q000032:analysis*; D019936:Probiotics; D013696:Temperature; D020068:Zygosaccharomyces / Q000187:drug effects / Q000254:growth & development
D010936:Plant Extracts
Bifidobacterium spp; Lactobacillus plantarum; fruit juice; probiotics