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?1560Please respect copyright.PENANAboPYC0Y0hq1560Please respect copyright.PENANAOAjfVLlD2v
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答案就在於舌頭上的味蕾感測機制之上。1560Please respect copyright.PENANAf7YkmdHojf
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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。1560Please respect copyright.PENANAlzQUkM1Lag
以感測甜味為例,以下為扼要的簡化過程。1560Please respect copyright.PENANA6RVSLRoS8T1560Please respect copyright.PENANADB8d2hv3jP
1560Please respect copyright.PENANA27KyJtLPE9
1.甜味物質與味蕾上的T1R2及T1R3合併。1560Please respect copyright.PENANAi6traDwmui
(Type1 Taste Receptor member 2 and 3)1560Please respect copyright.PENANAuBdGxoOYqJ
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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)。1560Please respect copyright.PENANAbzRVWx3oQX
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3. 鈣離子觸動TRPM5,產生電流。1560Please respect copyright.PENANAC0TDmcUsRB
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4. 電流經由神經細胞傳到大腦。1560Please respect copyright.PENANAbVwMQIvVoQ
1560Please respect copyright.PENANAycQBERPy8R
5. 大腦分析電流訊息,製造甜味的感覺。1560Please respect copyright.PENANAZjpVCKPYLs
1560Please respect copyright.PENANAFeMEFqcHfQ
(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。1560Please respect copyright.PENANApEB8faHWid1560Please respect copyright.PENANA0NW5FGd0Qh
1560Please respect copyright.PENANAzsNvIK1urI
TRPM5除了能夠感測鈣離子後,亦能感測溫度。1560Please respect copyright.PENANA1i8TqrD3sT
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。1560Please respect copyright.PENANApAtiCSJBFa
而電流越強的話,大腦便會轉遞出越甜的感覺。1560Please respect copyright.PENANAOjJ9uT0CiZ
1560Please respect copyright.PENANA9CqPssCYC3
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。1560Please respect copyright.PENANA9EKtCVbWhE
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1560Please respect copyright.PENANASvjVSCEXr2
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。1560Please respect copyright.PENANAD4QPJHP8aA
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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/toc1560Please respect copyright.PENANA3xlcypjhig
1560Please respect copyright.PENANA7OuQotvrcU
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。1560Please respect copyright.PENANAfXsBEmmMTU
1560Please respect copyright.PENANAKAPahhlDyT
Link:1560Please respect copyright.PENANA8NjBOulGW5
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio1560Please respect copyright.PENANAUQKtDMoRo2
1560Please respect copyright.PENANAz1adVEOf7p
1560Please respect copyright.PENANAN1wx7DTMjz
有興趣接收科學資訊的話,歡迎follow IG: potatopigtongue。1560Please respect copyright.PENANA5G0gvGOGQD
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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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