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？1568Please respect copyright.ＰＥＮＡＮＡwwQxS1PxAr
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答案就在於舌頭上的味蕾感測機制之上。1568Please respect copyright.ＰＥＮＡＮＡ9zs8ZKdt2K
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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。1568Please respect copyright.ＰＥＮＡＮＡQNXLtaLMpF
以感測甜味為例，以下為扼要的簡化過程。1568Please respect copyright.ＰＥＮＡＮＡi9NIcWg0K5
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1.甜味物質與味蕾上的T1R2及T1R3合併。1568Please respect copyright.ＰＥＮＡＮＡKHMiG8iIyk
(Type1 Taste Receptor member 2 and 3)1568Please respect copyright.ＰＥＮＡＮＡRuAD165qe2
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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)。1568Please respect copyright.ＰＥＮＡＮＡphRtRlazHT
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3. 鈣離子觸動TRPM5，產生電流。1568Please respect copyright.ＰＥＮＡＮＡbJ15j7JSIH
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4. 電流經由神經細胞傳到大腦。1568Please respect copyright.ＰＥＮＡＮＡW0VvPwVMzc
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5. 大腦分析電流訊息，製造甜味的感覺。1568Please respect copyright.ＰＥＮＡＮＡPYUZE0BTcL
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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。1568Please respect copyright.ＰＥＮＡＮＡIY2YImrtG8
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TRPM5除了能夠感測鈣離子後，亦能感測溫度。1568Please respect copyright.ＰＥＮＡＮＡJ8tnherZZI
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。1568Please respect copyright.ＰＥＮＡＮＡUIM2nxr5rS
而電流越強的話，大腦便會轉遞出越甜的感覺。1568Please respect copyright.ＰＥＮＡＮＡbekUVAGrR3
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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。1568Please respect copyright.ＰＥＮＡＮＡyhyovhRqgt
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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。1568Please respect copyright.ＰＥＮＡＮＡ4EL7xOsoAm
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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/toc1568Please respect copyright.ＰＥＮＡＮＡBQAO68Q5ha
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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/portfolio1568Please respect copyright.ＰＥＮＡＮＡLDP0SrbsRg
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