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This is Scientific American 60-Second Science. I'm Christopher Intagliata. Got a minute?

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As many San Franciscans have noticed, sourdough bread stays fresher longer than the regular stuff.

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Sourdough's extended freshness is due to extra fermentation that traps more moisture in the dough.

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But now we know that sourdough's longevity is also because it can ward off mold.

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Because bacteria in some sourdough starters actually produce mold-killing compounds--essentially natural preservatives.

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Most sourdough starters contain strains of Lactobacillus bacteria, like the poster child Lactobacillus sanfranciscensis.

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Eight years ago, researchers isolated another strain called Lactobacillus hammesii from a French sourdough starter.

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They've now discovered that the strain pumps out a potent antifungal as it digests bread flour.

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So they baked bread with the L.hammesii starter, sliced it, and waited.

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The loaf resisted mold for 12 days--a few days more than L.sanfranciscensis sourdough, and twice as long as typical bread.

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Those results are in the journal Applied and Environmental Microbiology.

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L.hammesii isn't the most common sourdough strain.

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But researchers say it could eliminate the need for added preservatives.

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Which would mean store-bought sourdough that's additive-free AND lasts for weeks.

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Assuming you can wait that long to eat it.

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Thanks for the minute, for Scientific American 60-Second Science. I'm Christopher Intagliata.

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