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？1586Please respect copyright.ＰＥＮＡＮＡ6FQuviFcoc
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答案就在於舌頭上的味蕾感測機制之上。1586Please respect copyright.ＰＥＮＡＮＡIAW7kHGwPh
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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。1586Please respect copyright.ＰＥＮＡＮＡ000QuLwJPP
以感測甜味為例，以下為扼要的簡化過程。1586Please respect copyright.ＰＥＮＡＮＡE68p0kNlUK
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1.甜味物質與味蕾上的T1R2及T1R3合併。1586Please respect copyright.ＰＥＮＡＮＡuT6I7klZHc
(Type1 Taste Receptor member 2 and 3)1586Please respect copyright.ＰＥＮＡＮＡAM4eILx8sQ
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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)。1586Please respect copyright.ＰＥＮＡＮＡVk9CdH5f8y
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3. 鈣離子觸動TRPM5，產生電流。1586Please respect copyright.ＰＥＮＡＮＡbRzUiKRpOY
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4. 電流經由神經細胞傳到大腦。1586Please respect copyright.ＰＥＮＡＮＡV3R6lK8XRE
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5. 大腦分析電流訊息，製造甜味的感覺。1586Please respect copyright.ＰＥＮＡＮＡd4G1m3v5H1
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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。1586Please respect copyright.ＰＥＮＡＮＡGkcHDX52bv
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TRPM5除了能夠感測鈣離子後，亦能感測溫度。1586Please respect copyright.ＰＥＮＡＮＡhuc1kr6UHS
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。1586Please respect copyright.ＰＥＮＡＮＡExFxtfTtMR
而電流越強的話，大腦便會轉遞出越甜的感覺。1586Please respect copyright.ＰＥＮＡＮＡhPBvedOEe5
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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。1586Please respect copyright.ＰＥＮＡＮＡSPELIHwWu1
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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。1586Please respect copyright.ＰＥＮＡＮＡySQM3wTtU7
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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/toc1586Please respect copyright.ＰＥＮＡＮＡcYuoubAe0Q
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同時亦可以在Penana網站裡按「買一嚿/半嚿薯仔」，以課金的方式推動我繼續搜羅資料寫文，多謝。1586Please respect copyright.ＰＥＮＡＮＡ4ZUjCcfOb3
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Link:1586Please respect copyright.ＰＥＮＡＮＡsJ9iXQiBX7
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio1586Please respect copyright.ＰＥＮＡＮＡoGqTnUrrx6
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有興趣接收科學資訊的話，歡迎follow IG: potatopigtongue。1586Please respect copyright.ＰＥＮＡＮＡ6M8NHFnW1r
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