STEM与日常科技·英语30篇（5）
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Why mRNA Lipid Nanoparticles Need Cold Chains
为何mRNA脂质纳米颗粒需冷链运输
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mRNA vaccines rely on fragile genetic molecules that degrade quickly at room temperature.
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Scientists package mRNA inside tiny fat-based carriers called lipid nanoparticles, or LNPs.
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These LNPs protect the mRNA like a bubble wrap during its journey into human cells.
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But heat makes the lipids wobble, causing the particles to leak or clump together.
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Even brief exposure above –20°C can reduce vaccine potency by over 30% in 48 hours.
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That is why ultra-cold freezers and dry ice are essential for global distribution.
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New research focuses on adding sugar-like stabilizers to help LNPs survive warmer conditions.
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Some next-generation formulations now stay stable for weeks at refrigerator temperatures.
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This improvement could expand vaccine access in remote or low-resource regions.
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Understanding LNP stability helps us appreciate both biotech innovation and logistics science.