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?1268Please respect copyright.PENANAHMAZmCnoAh
1268Please respect copyright.PENANAn2znICFGlw
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答案就在於舌頭上的味蕾感測機制之上。1268Please respect copyright.PENANA36X9UrLvKZ
1268Please respect copyright.PENANAFi0Gicqb9b
(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。1268Please respect copyright.PENANAZIfocLM0Hx
以感測甜味為例,以下為扼要的簡化過程。1268Please respect copyright.PENANA16aEnyr7uG
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1268Please respect copyright.PENANAwp3BvF2yWD
1.甜味物質與味蕾上的T1R2及T1R3合併。1268Please respect copyright.PENANADqH9SjOk7H
(Type1 Taste Receptor member 2 and 3)1268Please respect copyright.PENANAthQqje7NUb
1268Please respect copyright.PENANAMSxpdSSGWk
2.其後觸發一系列的細胞反應,並產生出鈣離子(Ca2+ ion)。1268Please respect copyright.PENANAYQ27R4McUJ
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3. 鈣離子觸動TRPM5,產生電流。1268Please respect copyright.PENANAyR20whYihq
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4. 電流經由神經細胞傳到大腦。1268Please respect copyright.PENANA1GKQc4ta7i
1268Please respect copyright.PENANAk1AHAMxYYk
5. 大腦分析電流訊息,製造甜味的感覺。1268Please respect copyright.PENANASrsDGUCFK0
1268Please respect copyright.PENANAdbsIt1Z5Qt
(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。1268Please respect copyright.PENANATwerttsDyF
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1268Please respect copyright.PENANAVTV5Hv0imR
TRPM5除了能夠感測鈣離子後,亦能感測溫度。1268Please respect copyright.PENANAO6FyLDKPeW
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。1268Please respect copyright.PENANAiL2UKFwguo
而電流越強的話,大腦便會轉遞出越甜的感覺。1268Please respect copyright.PENANAKJApWULltm
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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。1268Please respect copyright.PENANAH8t1cc79uz
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1268Please respect copyright.PENANA2ls9ugqESr
1268Please respect copyright.PENANAs4xruEDDN2
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。1268Please respect copyright.PENANAEJrkMip1pz
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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/toc1268Please respect copyright.PENANAX0kqQwtPUy
1268Please respect copyright.PENANAf3pKtTCRDS
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。1268Please respect copyright.PENANAi6LSdkbZpB
1268Please respect copyright.PENANAbhVYMMEocr
Link:1268Please respect copyright.PENANAVTuUXisWBk
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio1268Please respect copyright.PENANAD1XLE0AYwu
1268Please respect copyright.PENANA8mHtP18sTs
1268Please respect copyright.PENANAI2ubAblpe5
有興趣接收科學資訊的話,歡迎follow IG: potatopigtongue。1268Please respect copyright.PENANAej1St0xfFJ
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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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