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  3. Why does cream go bad faster than butter? Some researchers think they found the answer, and it comes down to the structure of th

Why does cream go bad faster than butter? Some researchers think they found the answer, and it comes down to the structure of th

admin2011-01-05  46
问题     Why does cream go bad faster than butter? Some researchers think they found the answer, and it comes down to the structure of the food,not its chemical composition--a finding that could help rid some processed foods of chemical preservatives.
    Cream and butter contain pretty much the same substances, so why cream should sour much faster has been a mystery. Both are emulsions--tiny globules (小球) of one liquid evenly distributed throughout another. The difference lies in what’s in the globules and what’s in the surrounding liquid, says Brocklehurst, who led the investigation.
    In cream, fatty globules drift about in a sea of water. In butter, globules of a watery solution are locked away in a sea of fat. The bacteria which make the food go bad prefer to live in the watery colonies of the mixture. "This means that in cream, the bacteria are free to grow throughout the mixture," he says. When the situation is reversed, the bacteria are locked away in compartments (密封仓) buried deep in the sea of fat. Trapped in this way, individual colonies cannot spread and rapidly run out of nutrients. They also slowly poison themselves with their waste products. "In butter, you get a self-limiting system which stops the bacteria growing," says Brocklehurst. The researchers are already working with food companies keen to see if their products can be made resistant to bacterial attack through alterations to the food’s structure. Brocklehurst believes it will be possible to make the emulsions used in salad cream,for instance,more like that in butter. The key will be to do this while keeping the salad cream liquid and not turning it into a solid lump.
The significance of Brocklehurst’s research is that ______.
选项 A、it suggested a way to keep some foods fresh without preservatives
B、it discovered tiny globules in both cream and butter
C、it revealed the secret of how bacteria multiply in cream and butter
D、it found that cream and butter share the same chemical composition
答案A
解析 文章中提到“a finding that could help rid some processed foods of chemical preservatives”，preservative是“防腐剂”的意思。因此，该研究的意义就在于掌握天然的防腐方法，从而淘汰化学防腐剂。
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