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?1495Please respect copyright.PENANAJ2mcIOmEWp1495Please respect copyright.PENANADuWrL5m3aq
1495Please respect copyright.PENANAjYND5ZBkLT
答案就在於舌頭上的味蕾感測機制之上。1495Please respect copyright.PENANAF8xUzrwrLX
1495Please respect copyright.PENANAViwaVyt8ij
(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。1495Please respect copyright.PENANAkYvjn9y4XZ
以感測甜味為例,以下為扼要的簡化過程。1495Please respect copyright.PENANAHKzDDy9SFj1495Please respect copyright.PENANAmFXU3OKLEc
1495Please respect copyright.PENANAJkODNNZ6YS
1.甜味物質與味蕾上的T1R2及T1R3合併。1495Please respect copyright.PENANA6YGmT6Z3QR
(Type1 Taste Receptor member 2 and 3)1495Please respect copyright.PENANAHS751ZgJpm
1495Please respect copyright.PENANA6mYcdwGfGk
2.其後觸發一系列的細胞反應,並產生出鈣離子(Ca2+ ion)。1495Please respect copyright.PENANA1FkQalmpCI
1495Please respect copyright.PENANAd4AtRjnVZ3
3. 鈣離子觸動TRPM5,產生電流。1495Please respect copyright.PENANA18sBgQlLCW
1495Please respect copyright.PENANArMXpMSHS7G
4. 電流經由神經細胞傳到大腦。1495Please respect copyright.PENANAO7nspxeIp8
1495Please respect copyright.PENANAeFkyqQs1tS
5. 大腦分析電流訊息,製造甜味的感覺。1495Please respect copyright.PENANADI8QRucn4o
1495Please respect copyright.PENANANN5egUSxoh
(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。1495Please respect copyright.PENANA53PidLf5u01495Please respect copyright.PENANAZyYP19d8b3
1495Please respect copyright.PENANATaQFXW1KZp
TRPM5除了能夠感測鈣離子後,亦能感測溫度。1495Please respect copyright.PENANAH2b6QTWBIn
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。1495Please respect copyright.PENANAe1h6T67IXW
而電流越強的話,大腦便會轉遞出越甜的感覺。1495Please respect copyright.PENANApW5SM2kW08
1495Please respect copyright.PENANARjSmTEx9yM
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。1495Please respect copyright.PENANAtyxJwW8Zlt
1495Please respect copyright.PENANAtxxyjtvzrS
1495Please respect copyright.PENANAXMewS7qbBL
1495Please respect copyright.PENANACMFEs0yAmV
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。1495Please respect copyright.PENANADLVvMn7DYK
1495Please respect copyright.PENANAkLsScan8qA
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/toc1495Please respect copyright.PENANAU9YSof3HjV
1495Please respect copyright.PENANAXZTs9T24l8
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。1495Please respect copyright.PENANA8LYCBGdD14
1495Please respect copyright.PENANAlMEbHu1mA8
Link:1495Please respect copyright.PENANAhtjF5FGpbC
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio1495Please respect copyright.PENANAszOpSa8NB2
1495Please respect copyright.PENANAY3pfOpqEi0
1495Please respect copyright.PENANAn4ONKa02pj
有興趣接收科學資訊的話,歡迎follow IG: potatopigtongue。1495Please respect copyright.PENANAppA1uBtSX0