保健 - 第89期 - page 26

24
健康話題
乾淨。竹炭的本領真像廣告中宣傳的那樣神奇嗎?
商家拿出的實驗佐證令人生疑,他們的實驗都是把
竹炭置於近乎飽和的甲醛蒸汽中進行的,每克竹炭
高達
68
毫克的甲醛吸附量就是在這個狀態下測得
的,這樣的環境,隨便扔進一塊木頭也能熏成甲醛
味的。關鍵問題是竹炭能不能鎖住這些甲醛,實驗
結果令人失望,一旦把這
些飽吸了甲醛的竹炭放到
沒有甲醛污染的空房間
裏,上面的甲醛會迅速釋
放,
3
個小時內每克竹炭
中的甲醛含量就能下降到
1.6
毫克——吸滿了甲醛
的竹炭一下子變成了污染
源。
所謂的竹炭吸附能力,主
要是因為這種不定型碳
(區別於鑽石那種晶體
碳,雖然化學成分是一樣
的)中有很多大小以微米計算的微孔結構。就像水
能滲在沙子裏一樣。甲醛、水這些成分都可以滲進
竹炭這些孔道裏面。不過,正如實驗所顯示的,除
了將甲醛收容在孔道裏,竹炭並沒有甚麽特殊的機
制來限制它們的自由,正如水可以從沙子裏面蒸發
乾淨一樣,甲醛也可以從竹炭裏揮發出來。
科研人員指出,竹炭吸附甲醛的能力有限,活性炭
對於甲醛的吸附並不穩定,甚至還不如跟水分子結
合得緊密。簡單來說就是,如果室內水蒸氣很多,
還可以把吸附在竹炭上的甲醛給擠出來。當然,如
果在竹炭的孔道里加上一
些可以與甲醛反應的物
質,或許效果會更好一
下,不過目前的技術水平
還無法辦到這點。
很多廣告有意將這些“內
幕”掩蓋起來,籠統宣稱
竹炭等活性炭物質的特殊
“吸附功效”,不過是斷
章取義,忽悠而已。
其實,一些綠色植物如吊
蘭可以吸收甲醛。吊蘭之
類的植物在光合作用下,
可以將吸收的甲醛用作合成有機酸、糖和氨基酸的
原料,儲存在體內,這是實打實的吸收。當然,最
高明的辦法是盡可能避免使用甲醛含量高的裝飾材
料。
Can “Bamboo Charcoal” Reduce Body Weight or Detoxify?
The latest healthcare vogue is putting “bamboo charcoal” into daily food, e.g., bread, biscuits, buns, etc.,
for detoxification, fat absorption and slimming. Although charcoal is known to absorb unpleasant smells,
moisture and harmful gasses; and to have ultra-red radiations that may stimulate circulation, “bamboo
charcoal” is now mixed with TCM herbs. However, the only valid TCM practice involving charcoal is
preparation of herbs, e.g., frying with charcoal to reduce the cooling properties; or to widen the application
spectrum: enhancing effectiveness. Although “bamboo charcoal” originated from Japan, it is not documented
in TCM practice. In fact, herbs for detoxification are mostly laxatives that may induce rebound constipation.
Charcoal is not effective for slimming; nor would it absorb fat in the blood, except for its absorbent and
astringent actions in the gut. Although the basis of slimming is charcoal may absorb nutrients, taking such
large quantities of charcoal risks unknown adverse effects – not safe and contraindicated. As long-term use
would even lead to constipation, you are advised to consult your doctor if slimming is desired!
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