一碗同等糖份的紅豆沙，如果將熱紅豆沙和凍紅豆沙比較的話，熱紅豆沙感覺起上來總是會比較甜，究竟為何會這樣呢？1567Please respect copyright.ＰＥＮＡＮＡxLMQu2Lqb8
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答案就在於舌頭上的味蕾感測機制之上。1567Please respect copyright.ＰＥＮＡＮＡ9rW43if6BI
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（圖2）我們的舌頭上佈滿味蕾細胞，主要功能是為我們感測食物的味道。1567Please respect copyright.ＰＥＮＡＮＡXrJa0ogj0e
以感測甜味為例，以下為扼要的簡化過程。1567Please respect copyright.ＰＥＮＡＮＡMPTF0ooRRM
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1.甜味物質與味蕾上的T1R2及T1R3合併。1567Please respect copyright.ＰＥＮＡＮＡo0xUCRq72m
(Type1 Taste Receptor member 2 and 3)1567Please respect copyright.ＰＥＮＡＮＡenFa5irnYC
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2.其後觸發一系列的細胞反應，並產生出鈣離子(Ca2+ ion)。1567Please respect copyright.ＰＥＮＡＮＡs5ALNW4Rpj
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3. 鈣離子觸動TRPM5，產生電流。1567Please respect copyright.ＰＥＮＡＮＡObBrsnqYqK
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4. 電流經由神經細胞傳到大腦。1567Please respect copyright.ＰＥＮＡＮＡwGgaieFW1a
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5. 大腦分析電流訊息，製造甜味的感覺。1567Please respect copyright.ＰＥＮＡＮＡAnHE5oEknl
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（圖3）那麼，為何熱紅豆沙會比較甜呢？玄機就在圖中機制的第三步。1567Please respect copyright.ＰＥＮＡＮＡLWDlfoi5vQ
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TRPM5除了能夠感測鈣離子後，亦能感測溫度。1567Please respect copyright.ＰＥＮＡＮＡMqZVGWJR27
若然食物溫度提升的話，TRPM5所發出的電流強度便會有所增長。1567Please respect copyright.ＰＥＮＡＮＡoegpjgIkBb
而電流越強的話，大腦便會轉遞出越甜的感覺。1567Please respect copyright.ＰＥＮＡＮＡmeHUbNu9Kz
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而正正就是因為這個緣故，儘管糖份一樣，熱紅豆沙食起上來會比凍紅豆沙感覺起上來會比較甜。1567Please respect copyright.ＰＥＮＡＮＡlAYtOJ6IFC
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如果想我快啲出文的話，請入去Penana網站科普專欄–薯不揀單俾一個like以及Bookmark，這對我非常之重要。1567Please respect copyright.ＰＥＮＡＮＡ0s0wjkR15h
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Link: https://www.penana.com/story/66244/%E7%A7%91%E6%99%AE%E5%B0%88%E6%AC%84-%E8%96%AF%E4%B8%8D%E6%8F%80%E5%96%AE/toc1567Please respect copyright.ＰＥＮＡＮＡjQesA9lb7U
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https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio1567Please respect copyright.ＰＥＮＡＮＡofEzefcdg1
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