什麼是單寧酸?

What is tannic acid?

Tannic acid is also called tannic acid .

Quercetic acid is one of two forms of tannins found in oak bark and leaves. Another form, called gallotannin, is found in oak galls.

What is the difference between tannin and tannic acid?

Tannins are polyphenolic biomolecules with a carbohydrate backbone found in a variety of plants. Tannic acid is a special kind of tannin , a type of polyphenol.

Although tannic acid is a specific type of tannin (a plant polyphenol), the two terms are sometimes (incorrectly) used interchangeably. The confusion has been fueled by the long-standing misuse of these terms and their appearance in scholarly articles. This is especially common in green and black teas, both of which contain many different types of tannins, not just tannins.

What are the uses of tannic acid?

Tannins are used topically to treat cold sores, diaper rash, fever blisters, and poison ivy. Tannins are also taken orally and used directly to treat bleeding, chronic diarrhea, dysentery, hematuria, joint pain, persistent coughs, and cancer.

Purpose and efficacy

May not be valid

  • burn. Applying tannins to the skin does not seem to work on minor burns or sunburns.
  • Diaper rash. Applying tannins to the skin does not seem to work for diaper rash.
  • Cold sores (cold sores). Applying tannins to the skin does not seem to work for cold sores.
  • Prickly heat. Applying tannic acid to the skin does not seem to have any effect on prickly heat.

Not enough evidence

  • diarrhea. Early research suggests that taking products containing tannic acid and gelatin (tannin-gelatin) may improve symptoms in children who have diarrhea for 3 days or less. But not all studies agree.
  • Excessive sweating (hyperhidrosis). Early research suggests that applying tannins to the palms may be less effective than iontophoresis, a type of electrical therapy, in reducing palm sweating.
  • diarrhea.
  • Osteoarthritis.
  • cancer.
  • Swollen tonsils.
  • Ingrown toenails.
  • Poison ivy.
  • Thinning of the gums.
  • sore throat.
  • Other conditions.

More evidence is needed to evaluate the effectiveness of tannins for these uses.

Are tannins safe for humans?

When taken orally: Tannins are probably safe in the amounts found in food. There is not enough reliable information to know whether it is safe when used in large doses. Large amounts of tannins can cause stomach irritation, nausea, and vomiting.

What foods contain tannins?

Humans consume many foods that contain large amounts of dietary tannins. Tannins are found in a variety of plants, including legume seeds, cider, cereals, cocoa, peas, some green leafy vegetables, coffee, tea, and nuts

Which tea has the most tannins?

Black tea has the highest tannin concentration, ranging from 11.76% to 15.14%, while green tea has the lowest, averaging 2.65% (with a maximum of 3.11%). The proportion of oolong tea ranks between black tea and green tea, at 8.66%.

What does tannic acid do to the skin?

Tannic acid, a promising anti-photoaging agent: evidence for its antioxidant and anti-wrinkle potential, and its ability to prevent photodamage and MMP-1 expression in L929 fibroblasts exposed to UVB. Free Radical Biomedicine.

Review

All comments are moderated before being published

HealthyPIG Magazine

View all
如何判斷牛肉是否變壞?

如何判斷牛肉是否變壞?

重點摘要 牛肉會變質嗎? 如何判斷牛肉是否變壞? 過期牛肉還能食嗎? 牛肉可存放多久? 如何儲存牛肉? 牛肉可以冷凍嗎? 結論 牛肉會變質嗎? 會。牛肉含高蛋白同水分,若溫度控制或衛生不當,細菌會快速繁殖,導致變壞。 如何判斷牛肉是否變壞? 顏色:鮮紅轉深褐甚至發黑;脂肪變黃。 ...
成年後懷疑自己有注意力不足過動症(ADHD),應該接受診斷嗎?

成年後懷疑自己有注意力不足過動症(ADHD),應該接受診斷嗎?

在過去,注意力不足過動症(Attention-Deficit/Hyperactivity Disorder, ADHD)多被視為「小孩的病」,很多成年人小時候從未被評估或診斷。直到近年社會對心理健康重視度提升,許多成人才開始懷疑,自己長期以來的專注困難、健忘、衝動或時間管理不良,可能與 ADHD 有關。這種「晚發現」的情況相當普遍,也引發了問題:成年後是否值得接受 ADHD 診斷?

哪些職業對健康影響最大?科學與現實的分析

哪些職業對健康影響最大?科學與現實的分析

在現代社會中,工作佔據了人們生命中相當大的一部分。然而,不同職業對健康的風險並不相同。一些工作性質或環境,會顯著增加慢性病、心理壓力、甚至縮短壽命的風險。以下從科學研究與醫學角度,探討幾類對健康損害較大的職業,並附上相關統計數據。

電擊槍的機制與對人體健康影響

電擊槍的機制與對人體健康影響

在現代執法中,警察常使用所謂「非致命性武器」(less-lethal weapons),其中最廣為人知的便是 電擊槍(Taser)。電擊槍的設計初衷是提供一種介於徒手制服與槍械之間的選擇,藉由暫時性電擊使嫌疑人失去行動能力,以降低致命暴力發生的風險。然而,電擊槍並非完全無害,背後涉及的電流機制與人體生理反應值得深入探討。

PD-(L)1/VEGF「三抗」:腫瘤免疫治療新方向

PD-(L)1/VEGF「三抗」:腫瘤免疫治療新方向

腫瘤治療的新挑戰 近十年來,免疫檢查點抑制劑(Immune Checkpoint Inhibitors, ICIs)改變咗癌症治療格局。當中 PD-1/PD-L1 抑制劑 已經成為多種腫瘤的一線或二線療法,而 VEGF 抑制劑 亦係抗血管生成治療嘅核心藥物。然而,臨床數據顯示,雖然 PD-(L...
疲勞駕駛的健康風險與新科技防護:REMONY 裝置的認證分析

疲勞駕駛的健康風險與新科技防護:REMONY 裝置的認證分析

疲勞駕駛一直是全球道路安全的重要議題。許多人將疲勞視為「只是累了」,但科學研究表明,當人處於極度疲倦時,大腦功能下降的程度可與酒精中毒相當。不僅如此,長時間駕駛還會對身體健康造成慢性負擔。隨著科技發展,越來越多可穿戴裝置被設計用來協助監測疲勞狀態,其中,日本 Medirom 公司開發的 REMONY 裝置近日獲得國土交通省(MLIT)認證,成為市場矚目的焦點。本文將先探討疲勞駕駛的健康風險,然後客觀分析 REMONY 裝置的技術特點與潛力。

腳跟為何會變黃乾裂?成因與護理全攻略

腳跟為何會變黃乾裂?成因與護理全攻略

腳跟皮膚為何容易出現問題? 腳跟係身體承受最大壓力嘅部位之一。每日行走、站立,腳跟長期摩擦同受壓,如果缺乏適當護理,就會導致角質層過度增厚、乾燥同龜裂。當角質層愈厚,皮膚顏色會慢慢變得偏黃,甚至暗啡。 造成腳跟黃、裂、脫皮的常見原因 角質層增厚長期行走或穿硬底鞋,令腳跟角質層積聚過多,顏色...
Wi-Fi 會唔會對人體有害?科學研究同日常生活影響全解析

Wi-Fi 會唔會對人體有害?科學研究同日常生活影響全解析

Wi-Fi 幾乎已經變成日常生活不可或缺嘅一部分。無論係屋企、公司、學校,甚至咖啡店同巴士,都有無線網絡覆蓋。但好多讀者都會擔心:「成日浸喺 Wi-Fi 入面,會唔會慢慢影響身體健康?會唔會致癌?會唔會令我失眠或者精神差?」 今篇文章會由淺入深,帶大家了解 Wi-Fi 嘅電磁波特性、科學研究結...
長時間保持一個姿勢,點解會痛、僵硬、麻痺?|久坐對身體嘅危害

長時間保持一個姿勢,點解會痛、僵硬、麻痺?|久坐對身體嘅危害

好多人每日要長時間坐喺辦公室、電腦前面,或者瞓覺時維持同一個姿勢。結果往往出現腰酸背痛、手腳麻痺,甚至覺得關節「鎖住」郁唔到。久坐傷身腳麻痺點解長時間坐姿影響健康,都係大家經常搜尋嘅問題。今次我哋就一齊睇下背後原因。