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http://dx.doi.org/10.5187/JAST.2004.46.4.687

Fermentation Properties and Functionality of Yogurt added with Lycium chinence Miller  

Bae, H,C. (Division of Animal Science & Resources, College of Agriculture & Life Sciences, Chungnam National University)
Cho, I.S. (Chungnam Agri. Res. & Ext. Services)
Nam, M.S. (Division of Animal Science & Resources, College of Agriculture & Life Sciences, Chungnam National University)
Publication Information
Journal of Animal Science and Technology / v.46, no.4, 2004 , pp. 687-700 More about this Journal
Abstract
This experiment was carried out to examine the fennentation properties of yogurts with or without Lyeii fructus, Lyeii folium and Lyeii cortex extract as additives at concentrations of 1.0%. The effects on promoting the fermentation by Lycii fructus, Lycii folium and Lycii cortex additives were higher and pH was below 4.06 when Streptococcus salivarius ssp. thermophilus and Lactobacillus delbrueckii ssp. bulgaricus, Lactobacillus cosei, and Lactobacillus acidophilus, Bifidobacterium longum and Streptococcus salivarius ssp. thermophilus were used. The acid production was higher when S. salivarius ssp. thermophilus and L. delbrueckii ssp. bulgaricw were used. The average lactic acid bacteria counts was 2.62 ${\times}$ $10^9$ cfu/ml in the yogurt added with Lycii fructus extract and fermentation with S. salivarius ssp. thermophilus and L. delbrueckii ssp. bulgaricw. The lactose hydrolysis ratio was higher in the milk added with Lycii fructus extract(36.11%), Lycii folium extract(37.76%) and Lycii cortex extract(32.70%) when S. salivarius ssp. thermophilus and L. delbrueckii ssp. bulgaricus were used. The isobutylic acid concentration was(34.39 to 37.72 mM) with S. salivarius ssp. thermophilus and L. delbrueckii ssp. bulgaricus. The viscosity of yogurt was 1,615 to 2,030 cP in yogurts added with skim milk and L. acidophilus; B. longum and S. salivarius ssp. thermophilus were used. The sensory scores of colors, tastes and overall acceptability of yogurt with Lycii cortex extract were shown 3.34 to 3.77 when fermented by L. cosei, L. acidophilus, B. longum and S. salivarius ssp. thermophilus. The cholesterol reducing effects were 17.38${\sim}$32.08% in all the yogurts and especially, greater effect(25.75 to 32.08%) for yogurts fermented with L. acidophilus KCTC3150 and L. salivarius subsp. salivarius CNU27. The inhibitory effects on the pathogenic bacteria by lactic acid bacteria added with Lycii fructus, Lycii folium and Lyeii cortex lower on S. typhimurium M-15, but higher on E. coli KCTC1021 and L. monocytogenes.
Keywords
Yogurt; Lyeii fructus; Lyeii folium; Lyeii cortex;
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