白內障是糖尿病引發出的一種常見徵狀,而箇中的因由,事實上是與我們日常生活息息相關的。229Please respect copyright.PENANASD24R9X1YU229Please respect copyright.PENANAkWDjyuv0Pp
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(圖2)我們眼睛的Lens部位之所以呈透明,主要是因為裡頭一種名為Crystallin的蛋白質所致。229Please respect copyright.PENANARaLuy4IB6u229Please respect copyright.PENANA15KBN5xNwW
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氨基酸組合成一起的話,我們會稱之為蛋白質。229Please respect copyright.PENANAo840RTvMIO
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而糖尿病所引起的白內障,就是糖份與Crystallin蛋白質的氨基酸產生反應,形成淡黃色的物質所致。229Please respect copyright.PENANAqkzJaBPQB5
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(圖3)氨基酸與某類別的糖份在高溫處理下,便會產生啡色物質及帶有香味等等的化學物,這個過程又稱之為梅納反應 (Maillard reaction);229Please respect copyright.PENANAw74nQYyuzH
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雖然梅納本人發佈梅納反應結果的時候,隻字沒有提及過會在食物上產生。229Please respect copyright.PENANA8vlL1v7hME229Please respect copyright.PENANAm3mUZqWcmD
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而糖尿病白內障的形成,原理跟梅納反應非常接近,同樣是血糖與Crystallin氨基酸產生啡黃色物質所致。229Please respect copyright.PENANAsXJsDwzHUk
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不同的是,白內障整個過程是長期在37度裡頭發生,而我們日常煮食/焗麵包/燒烤的溫度大多情況下會比37度為高,故此眼睛產生啡黃色物質的速度亦比較緩慢。229Please respect copyright.PENANAhkaET3SrAT
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有科學家亦曾嘗試將牛及人類的眼睛晶片放在陰暗位置的糖水裡10個月,其分離出的淡黃色物質,跟患有白內障的眼睛晶片所分離出的是一模一樣。229Please respect copyright.PENANAhDZaEEPFmc
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蛋白質產生出來後,細胞會有機制會將其毀滅,然後再產生新的蛋白質;229Please respect copyright.PENANAIZPcvbE8p4
尤其是蛋白質出現不正常的改變或損毀的時候,這過程尤為重要。229Please respect copyright.PENANAGJ94JSGRtC
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而眼睛晶片的Crystallin蛋白質,因為天生屬於「毀滅然後再生」極為緩慢的一群,因此就算遭受到糖份改造,細胞亦沒能作出處理及更正。229Please respect copyright.PENANAkfRFdTSxJC
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除眼睛晶片外,紅血球亦是遭受糖份梅納反應影響的一群。因此很多時候,某類別被糖份改造的紅血球含量會成為探測糖尿病的指標。229Please respect copyright.PENANAt4M9qgjEoR
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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。229Please respect copyright.PENANAhIzetsxb95
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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/toc229Please respect copyright.PENANAdVDlMiQ0iK
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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。229Please respect copyright.PENANAK6GS9QtbtF
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Link:229Please respect copyright.PENANAxSuqZHAE14
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio229Please respect copyright.PENANAlOuY9PlfWk
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除非Facebook及IG重開侵侵的account,否則我的IG將不會再作更新,只會寄居本土LIHKG及Penana。229Please respect copyright.PENANAhYGL6vH2BM
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Ref1:https://onlinelibrary.wiley.com/doi/full/10.1002/anie.201308808229Please respect copyright.PENANAfcWs9l7qab
Ref2:https://science.sciencemag.org/content/211/4481/491/tab-pdf229Please respect copyright.PENANAMXlEFXrCyb
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篇 #195
三十秒科學–何解糖尿病會引致白內障?
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