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?1273Please respect copyright.PENANAH8ClO2BRgV
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答案就在於舌頭上的味蕾感測機制之上。1273Please respect copyright.PENANAzP75aoUyDx
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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。1273Please respect copyright.PENANA8mMp3j1yX4
以感測甜味為例,以下為扼要的簡化過程。1273Please respect copyright.PENANAfZsRyTHLIM
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1.甜味物質與味蕾上的T1R2及T1R3合併。1273Please respect copyright.PENANAIc6OVEUCiB
(Type1 Taste Receptor member 2 and 3)1273Please respect copyright.PENANAqP0RAhMXGH
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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)。1273Please respect copyright.PENANAATDwzv1PcT
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3. 鈣離子觸動TRPM5,產生電流。1273Please respect copyright.PENANAfi2tkVch6E
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4. 電流經由神經細胞傳到大腦。1273Please respect copyright.PENANA1vlyDZrrUK
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5. 大腦分析電流訊息,製造甜味的感覺。1273Please respect copyright.PENANA4H5S4tlnzM
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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。1273Please respect copyright.PENANAZj1sJHEW44
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TRPM5除了能夠感測鈣離子後,亦能感測溫度。1273Please respect copyright.PENANApWoTiAA5RX
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。1273Please respect copyright.PENANA5CHMpaacIQ
而電流越強的話,大腦便會轉遞出越甜的感覺。1273Please respect copyright.PENANA3Luek4kvvG
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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。1273Please respect copyright.PENANAUe2pxPCreH
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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。1273Please respect copyright.PENANAwtSpLOoHct
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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/toc1273Please respect copyright.PENANAxJROIggmrE
1273Please respect copyright.PENANAWQ8JX7V60X
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。1273Please respect copyright.PENANAMA7PoFr0KV
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Link:1273Please respect copyright.PENANAHp30eyXNjL
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio1273Please respect copyright.PENANA32mpQqzY8V
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有興趣接收科學資訊的話,歡迎follow IG: potatopigtongue。1273Please respect copyright.PENANABkQzQzUPrO
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薯仔聞茱莉
篇 #34
深入淺出–為何熱紅豆沙食起上來會比凍紅豆沙感覺更甜
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