科普專欄–薯不揀單 - 深入淺出–腋下異味的來源

如果測量一個人的細胞數量，事實上只有25%是屬於人體細胞，其餘的75%均由細菌及真菌所據。1951Please respect copyright.ＰＥＮＡＮＡdAWqRNjOha
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細菌及真菌可以說是「無處不在」，它們不但寄宿於我們的皮膚外層，亦同時駐紮在我們身體內的腸道及各器官部位，與我們成呈共生關係。1951Please respect copyright.ＰＥＮＡＮＡBUCMdX9asV
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最近有科學家發表學術文章（Ref1)，講述位於汗腺附近的細菌就是腋下異味的其中一個元兇。1951Please respect copyright.ＰＥＮＡＮＡHneyf54px1
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（圖1）我們身體的肝腺大致分為兩種，外分泌汗腺(Eccrine Sweat Glands)及大汗腺1951Please respect copyright.ＰＥＮＡＮＡmZ8FDQisa6
(Apocrine Sweat Glands)1951Please respect copyright.ＰＥＮＡＮＡZXScakVJHB
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前者接近遍佈全身，不與毛髮連接。後者主要位於腋下、乳頭及私處部位，與毛髮連接。1951Please respect copyright.ＰＥＮＡＮＡL5Sqz35jAU
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外分泌汗腺的主要功能就是散發汗水幫助散熱，調節體溫。1951Please respect copyright.ＰＥＮＡＮＡ1GpE3k4uAD
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而大汗腺的主要功能，到目前為止仍未能搞得清楚。1951Please respect copyright.ＰＥＮＡＮＡ20VRuyfDnH
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（圖2）下列三點為文中所找出的異味散發機制。1951Please respect copyright.ＰＥＮＡＮＡTr9C4F4icP
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1.大汗腺釋出無味物質Cys-Gly-3M3SH。1951Please respect copyright.ＰＥＮＡＮＡ3yIxyaqrtd
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2.腋下某品種的葡萄球菌消化Cys-Gly-3M3SH。1951Please respect copyright.ＰＥＮＡＮＡajqIuhLdqf
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3. 葡萄球菌消化過後，吐出帶有異味的3M3SH。1951Please respect copyright.ＰＥＮＡＮＡydXOMNHuPt
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換句話說，腋下的異味就是由這些細菌引致而成的。1951Please respect copyright.ＰＥＮＡＮＡtIWOdnAVCj
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（圖3）為作進一步的證實，科學家利用黃金葡萄球菌作對照實驗。1951Please respect copyright.ＰＥＮＡＮＡ0DgeqcqOrF
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他們發現人葡萄球菌的近親黃金葡萄球菌並沒能夠將無味的Cys-Gly-3M3SH消化成為帶有異味的3M3SH。1951Please respect copyright.ＰＥＮＡＮＡBWZiwsm2Qw
但是，當把人葡萄球菌其中一隻酵素轉移到黃金葡萄球菌後，無味的Cys-Gly-3M3SH便能夠被消化成為帶有異味的3M3SH，證實異味是由那隻酵素所致。1951Please respect copyright.ＰＥＮＡＮＡ15Jb09SY6q
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這隻酵素一直以來並沒有被前人發現，亦即是說，只要能夠研發出抑制那隻酵素的止汗劑的話，腋下的大部份異味亦能得以除去；1951Please respect copyright.ＰＥＮＡＮＡgt5XQtw8QD
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異味的產生，基本上是由硫醇（Thioalcohol)及脂肪酸(Fatty acid)而成。此文章所談及的機制純屬與硫醇的產生有關，沒有觸及脂肪酸那一方面。1951Please respect copyright.ＰＥＮＡＮＡBBjlGFIpMM
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而臭狐是否由這細菌引起或有份參與，文中並沒有提及。1951Please respect copyright.ＰＥＮＡＮＡeE08YBcMIq
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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。1951Please respect copyright.ＰＥＮＡＮＡ05UdzPHfMV
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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/toc1951Please respect copyright.ＰＥＮＡＮＡaE8kL9tWCm
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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。1951Please respect copyright.ＰＥＮＡＮＡPeN4hbYvaP
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Link:1951Please respect copyright.ＰＥＮＡＮＡiyF0EtlmCL
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio1951Please respect copyright.ＰＥＮＡＮＡeTd3xvB1Pv
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有興趣接收科普資訊的話，歡迎follow IG: potatopigtongue。1951Please respect copyright.ＰＥＮＡＮＡCPmEczZxWL
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Ref1:https://www.nature.com/articles/s41598-020-68860-z1951Please respect copyright.ＰＥＮＡＮＡ4CIboeJax4

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