十万个为什么·科学启蒙30篇（4）
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Why Honey Resists Spoilage Almost Indefinitely
为什么蜂蜜几乎不变质
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Honey has very low water content, usually below 18%, which prevents most microbes from growing.
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Its high sugar concentration creates osmotic pressure that pulls water out of bacterial cells.
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Bees add an enzyme called glucose oxidase to nectar, which produces hydrogen peroxide slowly.
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This mild antiseptic compound inhibits microbial growth without harming humans.
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Honey is also naturally acidic, with a pH between 3.2 and 4.5, too low for many pathogens.
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Even ancient honey found in Egyptian tombs remained edible after thousands of years.
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Crystallization doesn’t mean spoilage—it’s just glucose forming solid particles over time.
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Storing honey in airtight containers keeps moisture out and preserves its stability.
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Unlike fruit juices or milk, honey lacks nutrients that fast-growing bacteria need.
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Modern food scientists use honey’s preservation traits to develop natural food preservatives.