AcetoinAcetoin is a neutral, four-carbon, chiral molecule used as an external energy store by a number of fermentive bacteria. It is a colorless or pale yellow to green yellow liquid with a pleasant, buttery odor, giving butter its characteristic flavor. Acetoin is used as a food flavoring in baked goods and is also found in apples, yogurt, asparagus, black currants, blackberries, wheat, broccoli, brussels sprouts, cantaloupes, and maple syrup.
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