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KMID : 0665220210340060604
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Korean Journal of Food and Nutrition
2021 Volume.34 No. 6 p.604 ~ p.611
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Effects of Oat Addition and Various Lactic Acid Bacteria on Quality Characteristics and Antioxidant Activity of Yogurt
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Lee Mi-Ja
Yang Ji-Yeong
Kim Hyun-Young
Song Seung-Yeob
Seo Woo-Duck
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Abstract
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In this study, we investigated the effects of adding oat and lactic acid bacteria on the quality and functionality of yogurt. Yogurt was fermented with various lactic acid bacteria,; Lactobacillus acidophilus (LA), Lactobacillus delbrueckii sub. bulgaricus (LB), and Streptococcus thermophilussei (ST) and quality properties, β-glucan content, antioxidant activity were estimated. The quality of control and oat added yogurt (OY) showed significant differences depending on the type of strain and combination. The addition of oats significantly accelerated the lactic acid bacteria production, decreased the pH, and increased the titratable acidity and count of the viable cells compared to the control. Acid production was highest in ST, with the complex strains containing ST and LALBST showing high quality characteristics. The viscosity of oat yogurt was higher than that of the control group, and LALBST was also significantly higher than that of the control group. The β-glucan content of OY was 0.14-0.2%, and the organic acid content and antioxidant activity were also significantly increased by the addition of oats. As a result, it is thought that the addition of oats and a combination of lactic acid bacteria can be used for improving the quality and functionality of yogurt.
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KEYWORD
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oat, yogurt, lactic acid bacteria, β-glucan, viable cell count
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