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A new NADH oxidase, useful for the regeneration of NAD+, was isolated and characterized from Lactobacillus brevis. In crude extracts the activity was from 10–15 U mg−1. After purification by four chromatographic steps, an activity of 116 U mg−1 was obtained with 14% yield. Highest activity was from pH 5.5–7 and at 40 °C. The enzyme requires dithiothreitol to prevent oxidative deactivation. The Km...
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