1.4 杯裡的三位角色
英文是核對事實的源頭。 用頁頂語言切換列在英文/繁體/簡體之間跳轉。
上標數字是可點擊的腳註(跳到來源,箭嘴跳回;懸停常會彈出摘要)。摺疊的「更多詳情…」方框收着分子式、半衰期表、受體/路徑標籤,以及膠囊 vs 罐子數學,讓打開的頁面保持白話。
按不同時鐘到來的客人
日常談茶化學,多數圍繞三個名字。把它們當成以不同速度到來、在不同時間離開的客人——在植物(1.1)、廠房分叉(1.2)與水壺(1.3)已做完它們的工作之後。
打開的故事你只需要三個白話時鐘:提神(以小時計)、平靜專注(數十分鐘),以及綠茶植物化合物(介乎其間)。分子式、半衰期表、肝酶名與受體細節,住在摺疊裡。
- 提神客人 — 咖啡因;擋住「該睡覺了」的感覺。
- 平靜專注客人 — L-茶胺酸;把嘈雜的閒聊調柔,令注意力感覺不那麼慌。
- 綠茶植物化合物客人 — EGCG;綠茶裡最突出的兒茶素。
- 不是即時禪 — 峰值效應在喝後數十分鐘,不在第一口。
咖啡因——熟悉的提神客人
咖啡因支持清醒。白話說,它擋住腦裡「你開始困了」的訊號,所以你繼續工作。血裡的典型故事:它往往盤桓數小時——不過人與人差很多。1
最後那句很重要。朋友「晚飯還在Buzz」可以是生物化學,不是戲劇。想要分子式、半衰期範圍,以及那份差異背後的肝酶名時,打開下面的摺疊。
L-茶胺酸——平靜專注客人
L-茶胺酸是茶裡一種令人平靜的胺基酸。白話說,它輕輕關掉過量的「衝」閒聊,支持較平靜、較可控的注意力——想像音量旋鈕,不是安眠藥。血裡的典型故事:時鐘比咖啡因短,往往以數十分鐘量到稍多於一小時。23
EGCG——綠茶兒茶素客人
EGCG是主要的綠茶植物化合物(一種兒茶素)。在模組一的日常說法裡,它是 第 1.3 課 裡需要更多熱與時間才離開葉子的那位客人。研究文獻裡,它出現在炎症與細胞訊號的對話中。血裡的典型故事:口服劑量後的多小時尺度——夾在咖啡因的長盤桓與 L-茶胺酸的較短時鐘之間。4
為甚麼「我一小時前喝了茶」是三個故事
日常衣服裡的「半衰期」意思是:血裡量大約減半要多久——不是「完全消失」。這很重要,因為「我一小時前喝了茶」對每種化合物不是同一個故事。咖啡因往往盤桓數小時。L-茶胺酸的血漿時鐘較短。EGCG 介乎其間。人體時程工作顯示,口服峰值大約在數十分鐘到一兩小時,視化合物與劑型而定。56
那麼喝的時候該預期甚麼?來自咖啡因的清醒,以及來自 L-茶胺酸的平靜專注貢獻——但不是第一口的「即時禪」。L-茶胺酸的血峰值往往約在喝後 35–50 分鐘。與 L-茶胺酸相關的清楚腦波變化,通常約在攝入後 30–45 分鐘 報告。7 志願者研究裡,L-茶胺酸加咖啡因的飲品,注意力益處往往約在一小時標記附近。89
最後一點殺死一個流行說法:「茶給你即時禪專注。」L-茶胺酸確實到達腦,但來源報告的是上面的時間——不是第一口。
| 客人 | 分子式 | 約分子量 | 典型血漿半衰期 | 日常角色 |
|---|---|---|---|---|
| 咖啡因 | C₈H₁₀N₄O₂ | 194.19 g/mol | 約 3–7 小時 | 擋住腺苷「困」受體 |
| L-茶胺酸 | C₇H₁₄N₂O₃ | 174.20 g/mol | 約 50–80 分鐘 | 調柔過量興奮閒聊;支持平靜專注 |
| EGCG | C₂₂H₁₈O₁₁ | 458.37 g/mol | 約 2–5 小時 | 主要綠茶兒茶素;炎症/細胞訊號研究 |
半衰期意思是「血水平大約減半要多久」,不是「完全消失」。咖啡因往往盤桓數小時;L-茶胺酸的血漿時鐘較短;EGCG 介乎其間。101112
為甚麼咖啡因範圍很寬。 多數咖啡因清除經由肝酶 CYP1A2,而那項活性人與人差很多。吸煙、荷爾蒙、藥物、肝健康與基因(包括常見 CYP1A2 變體)都會移動一劑量盤桓多久。13 所以「我三小時前喝了茶」對每位飲者不是同一個故事——甚至在你計算杯濃度之前。
受體/路徑標籤(給模組二交叉連結)。 咖啡因的日常作用是腺苷受體拮抗。14 L-茶胺酸可以在某些麩胺酸受體位點(AMPA、kainate、NMDA 相關)弱競爭——遠不如麩胺酸本身有力——符合「調柔嘈雜閒聊」的畫面。1516 EGCG 出現在資料包裡與 NF-κB 相關及其他細胞訊號的談話;模組一只需要時鐘與綠茶身分。17
人體時程工作顯示,口服峰值大約在數十分鐘到一兩小時,視化合物與劑型而定。1819 與 L-茶胺酸相關的清楚 α 波變化,往往約在攝入後 30–45 分鐘 報告;L-茶胺酸加咖啡因的注意力益處往往約在一小時標記。2021
三位客人看完了?模組入口 保留一份短短的飲者田野指南(綠 vs 紅選擇、冷泡迷思、實驗室 vs 杯子劑量),再踏進第 2 章。
一分鐘故事
三位具名客人共享杯子。咖啡因擋住困意訊號,可以盤桓數小時。L-茶胺酸在較短血漿時鐘上支持較平靜的專注。EGCG 是多小時尺度上最突出的綠茶植物化合物。沒有一位在第一口達峰。實驗室膠囊與超市茶包是不同世界。
- 三位客人,三個時鐘:提神(咖啡因)、平靜專注(L-茶胺酸)、綠茶植物化合物(EGCG)。
- 杯子送出數十 mg;許多實驗室試驗用 100–200 mg 膠囊——別搞混。
- 「不是即時禪」:平靜專注往往落後第一口數十分鐘。
三位客人怎樣為模組二鋪路
模組二的雙重故事,只有在你記得誰在血流裡時才成立:
- 咖啡因令困意訊號較難停車——對許多人是數小時。37
- L-茶胺酸以較短時鐘到來,被研究用來談較平靜的注意力與壓力緩衝——不是第一口咒語。3839
- EGCG是綠茶兒茶素頭條化合物;它關乎萃取出了甚麼(第 1.3 課),即使模組二花更多字在咖啡因×茶胺酸。
若你跳過劑量與時間,模組二變成口號。若你留住它們,模組二變成地圖。
脚注
Fredholm, B. B., Bättig, K., Holmén, J., Nehlig, A., & Zvartau, E. E. (1999). Actions of caffeine in the brain with special reference to factors that contribute to its widespread use. Pharmacological Reviews, 51(1), 83–133. https://pharmrev.aspetjournals.org/content/51/1/83↩︎
Kakuda, T., Nozawa, A., Sugimoto, A., & Niino, H. (2002). Inhibition by theanine of binding of [³H]AMPA, [³H]kainate, and [³H]MDL 105,519 to glutamate receptors. Bioscience, Biotechnology, and Biochemistry, 66(12), 2683–2686. https://doi.org/10.1271/bbb.66.2683↩︎
Kakuda, T. (2011). Neuroprotective effects of theanine and its preventive effects on cognitive dysfunction. Pharmacological Research, 64(2), 162–168.↩︎
Chow, H. H. S., et al. (2001). Pharmacokinetics and safety of green tea polyphenols after multiple-dose administration of epigallocatechin gallate and Polyphenon E in healthy individuals. Clinical Cancer Research, 7(5), 1204–1212.↩︎
van der Pijl, P. C., et al. (2010). Human pharmacokinetic profile of green tea catechins and L-theanine. British Journal of Nutrition, 104(8), 1157–1164.↩︎
Scheid, L., et al. (2012). Kinetics of L-theanine uptake and metabolism in healthy humans (pack-cited Journal of Nutrition entry).↩︎
Nobre, A. C., Rao, A., & Owen, G. N. (2008). L-theanine, a natural constituent in tea, and its effect on mental state. Asia Pacific Journal of Clinical Nutrition, 17(S1), 167–168. https://pubmed.ncbi.nlm.nih.gov/18296328/↩︎
Owen, G. N., et al. (2008). The combined effects of L-theanine and caffeine on cognitive performance and mood. Nutritional Neuroscience, 11(4), 193–198. https://doi.org/10.1179/147683008X301513↩︎
Haskell, C. F., et al. (2008). The effects of L-theanine, caffeine and their combination on cognition and mood. Biological Psychology, 77(2), 113–122. https://doi.org/10.1016/j.biopsycho.2007.09.008↩︎
Fredholm, B. B., Bättig, K., Holmén, J., Nehlig, A., & Zvartau, E. E. (1999). Actions of caffeine in the brain with special reference to factors that contribute to its widespread use. Pharmacological Reviews, 51(1), 83–133. https://pharmrev.aspetjournals.org/content/51/1/83↩︎
Chow, H. H. S., et al. (2001). Pharmacokinetics and safety of green tea polyphenols after multiple-dose administration of epigallocatechin gallate and Polyphenon E in healthy individuals. Clinical Cancer Research, 7(5), 1204–1212.↩︎
van der Pijl, P. C., et al. (2010). Human pharmacokinetic profile of green tea catechins and L-theanine. British Journal of Nutrition, 104(8), 1157–1164.↩︎
Nehlig, A. (2018). Interindividual differences in caffeine metabolism and factors driving caffeine consumption. Pharmacological Reviews, 70(2), 384–411. https://doi.org/10.1124/pr.117.014407↩︎
Fredholm, B. B., Bättig, K., Holmén, J., Nehlig, A., & Zvartau, E. E. (1999). Actions of caffeine in the brain with special reference to factors that contribute to its widespread use. Pharmacological Reviews, 51(1), 83–133. https://pharmrev.aspetjournals.org/content/51/1/83↩︎
Kakuda, T., Nozawa, A., Sugimoto, A., & Niino, H. (2002). Inhibition by theanine of binding of [³H]AMPA, [³H]kainate, and [³H]MDL 105,519 to glutamate receptors. Bioscience, Biotechnology, and Biochemistry, 66(12), 2683–2686. https://doi.org/10.1271/bbb.66.2683↩︎
Kakuda, T. (2011). Neuroprotective effects of theanine and its preventive effects on cognitive dysfunction. Pharmacological Research, 64(2), 162–168.↩︎
Chow, H. H. S., et al. (2001). Pharmacokinetics and safety of green tea polyphenols after multiple-dose administration of epigallocatechin gallate and Polyphenon E in healthy individuals. Clinical Cancer Research, 7(5), 1204–1212.↩︎
van der Pijl, P. C., et al. (2010). Human pharmacokinetic profile of green tea catechins and L-theanine. British Journal of Nutrition, 104(8), 1157–1164.↩︎
Scheid, L., et al. (2012). Kinetics of L-theanine uptake and metabolism in healthy humans (pack-cited Journal of Nutrition entry).↩︎
Nobre, A. C., Rao, A., & Owen, G. N. (2008). L-theanine, a natural constituent in tea, and its effect on mental state. Asia Pacific Journal of Clinical Nutrition, 17(S1), 167–168. https://pubmed.ncbi.nlm.nih.gov/18296328/↩︎
Owen, G. N., et al. (2008). The combined effects of L-theanine and caffeine on cognitive performance and mood. Nutritional Neuroscience, 11(4), 193–198. https://doi.org/10.1179/147683008X301513↩︎
Owen, G. N., et al. (2008). The combined effects of L-theanine and caffeine on cognitive performance and mood. Nutritional Neuroscience, 11(4), 193–198. https://doi.org/10.1179/147683008X301513↩︎
Haskell, C. F., et al. (2008). The effects of L-theanine, caffeine and their combination on cognition and mood. Biological Psychology, 77(2), 113–122. https://doi.org/10.1016/j.biopsycho.2007.09.008↩︎
Keenan, E. K., et al. (2011). How much theanine in a cup of tea? Effects of tea type and method of preparation. Food Chemistry, 125(2), 588–594. https://doi.org/10.1016/j.foodchem.2010.08.071↩︎
Nobre, A. C., Rao, A., & Owen, G. N. (2008). L-theanine, a natural constituent in tea, and its effect on mental state. Asia Pacific Journal of Clinical Nutrition, 17(S1), 167–168. https://pubmed.ncbi.nlm.nih.gov/18296328/↩︎
Owen, G. N., et al. (2008). The combined effects of L-theanine and caffeine on cognitive performance and mood. Nutritional Neuroscience, 11(4), 193–198. https://doi.org/10.1179/147683008X301513↩︎
Nehlig, A. (2018). Interindividual differences in caffeine metabolism and factors driving caffeine consumption. Pharmacological Reviews, 70(2), 384–411. https://doi.org/10.1124/pr.117.014407↩︎
Nobre, A. C., Rao, A., & Owen, G. N. (2008). L-theanine, a natural constituent in tea, and its effect on mental state. Asia Pacific Journal of Clinical Nutrition, 17(S1), 167–168. https://pubmed.ncbi.nlm.nih.gov/18296328/↩︎
Owen, G. N., et al. (2008). The combined effects of L-theanine and caffeine on cognitive performance and mood. Nutritional Neuroscience, 11(4), 193–198. https://doi.org/10.1179/147683008X301513↩︎
Haskell, C. F., et al. (2008). The effects of L-theanine, caffeine and their combination on cognition and mood. Biological Psychology, 77(2), 113–122. https://doi.org/10.1016/j.biopsycho.2007.09.008↩︎
Fredholm, B. B., Bättig, K., Holmén, J., Nehlig, A., & Zvartau, E. E. (1999). Actions of caffeine in the brain with special reference to factors that contribute to its widespread use. Pharmacological Reviews, 51(1), 83–133. https://pharmrev.aspetjournals.org/content/51/1/83↩︎
Fredholm, B. B., Bättig, K., Holmén, J., Nehlig, A., & Zvartau, E. E. (1999). Actions of caffeine in the brain with special reference to factors that contribute to its widespread use. Pharmacological Reviews, 51(1), 83–133. https://pharmrev.aspetjournals.org/content/51/1/83↩︎
Kakuda, T., Nozawa, A., Sugimoto, A., & Niino, H. (2002). Inhibition by theanine of binding of [³H]AMPA, [³H]kainate, and [³H]MDL 105,519 to glutamate receptors. Bioscience, Biotechnology, and Biochemistry, 66(12), 2683–2686. https://doi.org/10.1271/bbb.66.2683↩︎
Kakuda, T. (2011). Neuroprotective effects of theanine and its preventive effects on cognitive dysfunction. Pharmacological Research, 64(2), 162–168.↩︎
Chow, H. H. S., et al. (2001). Pharmacokinetics and safety of green tea polyphenols after multiple-dose administration of epigallocatechin gallate and Polyphenon E in healthy individuals. Clinical Cancer Research, 7(5), 1204–1212.↩︎
Nehlig, A. (2018). Interindividual differences in caffeine metabolism and factors driving caffeine consumption. Pharmacological Reviews, 70(2), 384–411. https://doi.org/10.1124/pr.117.014407↩︎
Fredholm, B. B., Bättig, K., Holmén, J., Nehlig, A., & Zvartau, E. E. (1999). Actions of caffeine in the brain with special reference to factors that contribute to its widespread use. Pharmacological Reviews, 51(1), 83–133. https://pharmrev.aspetjournals.org/content/51/1/83↩︎
Nobre, A. C., Rao, A., & Owen, G. N. (2008). L-theanine, a natural constituent in tea, and its effect on mental state. Asia Pacific Journal of Clinical Nutrition, 17(S1), 167–168. https://pubmed.ncbi.nlm.nih.gov/18296328/↩︎
Owen, G. N., et al. (2008). The combined effects of L-theanine and caffeine on cognitive performance and mood. Nutritional Neuroscience, 11(4), 193–198. https://doi.org/10.1179/147683008X301513↩︎
Keenan, E. K., et al. (2011). How much theanine in a cup of tea? Effects of tea type and method of preparation. Food Chemistry, 125(2), 588–594. https://doi.org/10.1016/j.foodchem.2010.08.071↩︎