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Content of Orotic Acid in Raw milk and Reduction of OA by Lactic Acid Bacteria during Fermentation  

Song, Young-Min (Institute of Dairy Food Research, Seoul Dairy Co-op.)
Kim, Cherl-Hyun (Institute of Dairy Food Research, Seoul Dairy Co-op.)
Baick, Seung-Cun (Institute of Dairy Food Research, Seoul Dairy Co-op.)
Publication Information
Korean Journal of Food Science and Technology / v.36, no.1, 2004 , pp. 86-91 More about this Journal
Abstract
Changes in erotic acid (OA) contents of raw milk and during cultivation and storage at refrigerated temperature were determined. OA contents of raw and 10% reconstituted milk held at $121^{\circ}C$ for up to 15 min decreased by 17.6 and 22.4%, and those fermented at 40 and $37^{\circ}C$ for 72 hr with Lactobacillus helveticus 166 and Lactobacillus casei 955 decreased 37.8-43.2 and 41.8-76%, whereas when fermented at $40^{\circ}C$ for 72 hr with Streptococcus thermophilus ST-37, did not decrease significantly compared with fermentation by other lactobacilli. OA content did not change during storage at refrigeration temperature. OA reduction by Lactobacillus sp. was dramatically increased at the initiation of stationary phase during fermentation. OA reduction varied among different lactobacilli. These results show decrease in cultivation time, rapid cooling of yogurt, and proper selection of Lactobacillus sp. prevent OA content reduction.
Keywords
orotic acid; raw milk; lactic acid bacteria; fermentation;
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