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?1254Please respect copyright.PENANAejxwyD05zZ
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答案就在於舌頭上的味蕾感測機制之上。1254Please respect copyright.PENANAnhiZlmKCut
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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。1254Please respect copyright.PENANApBUQTZZm31
以感測甜味為例,以下為扼要的簡化過程。1254Please respect copyright.PENANATSSFMCvJUV
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1.甜味物質與味蕾上的T1R2及T1R3合併。1254Please respect copyright.PENANAOWLQUZtRW9
(Type1 Taste Receptor member 2 and 3)1254Please respect copyright.PENANApgAnD9CxCz
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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)。1254Please respect copyright.PENANA9Hn8pjuq2S
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3. 鈣離子觸動TRPM5,產生電流。1254Please respect copyright.PENANAjyejkMrmRC
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4. 電流經由神經細胞傳到大腦。1254Please respect copyright.PENANAAa4B3xalZt
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5. 大腦分析電流訊息,製造甜味的感覺。1254Please respect copyright.PENANAcXacxWQu64
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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。1254Please respect copyright.PENANA12LIfS8VUS
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TRPM5除了能夠感測鈣離子後,亦能感測溫度。1254Please respect copyright.PENANAhoYkiVM0Lj
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。1254Please respect copyright.PENANASxquOxn6OL
而電流越強的話,大腦便會轉遞出越甜的感覺。1254Please respect copyright.PENANAJ9YlwSeshH
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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。1254Please respect copyright.PENANAqR5jTqYYob
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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。1254Please respect copyright.PENANAPokFovNEGI
1254Please respect copyright.PENANAj7eSC1l4z0
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/toc1254Please respect copyright.PENANAoJjKHHga7H
1254Please respect copyright.PENANAezqBbZZ22p
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。1254Please respect copyright.PENANAzdT2b0TN7i
1254Please respect copyright.PENANAPVA8OiQywB
Link:1254Please respect copyright.PENANA4p2COhJcGo
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio1254Please respect copyright.PENANAJqhgvZGtpw
1254Please respect copyright.PENANAmiCdcQGpxc
1254Please respect copyright.PENANA72ore4TbYw
有興趣接收科學資訊的話,歡迎follow IG: potatopigtongue。1254Please respect copyright.PENANAtjGL25nCKV
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科普專欄–薯不揀單
Author:
薯仔聞茱莉
ISSUE #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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