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葡萄、李子上的白霜是果粉,白斑點才是農藥!

常常以為葡萄、李子、藍莓表面上的那層白白的是農藥嗎?
洗不掉!!別糾結了!!
這層白霜的其實叫做果霜或果粉,它是生物天然形成的,對人體無害,

常常以為葡萄、李子、藍莓表面上的那層白白的是農藥嗎?
洗不掉!!別糾結了!!
這層白霜的其實叫做果霜或果粉,它是生物天然形成的,對人體無害,

一般高品質的葡萄種植時會包一層袋子在外面,避免蟲害與農藥過量,
如果使用了較多的農藥或著直接噴灑與葡萄上,就會破壞果粉,在表面上造成斑點狀。

葡萄果皮上的果粉是一層角質層,像人身體最外層的皮膚一樣,具有保護果實作用。

在角質層外表面還有一些蠟質,叫做表面蠟質(epicticular wax)。
在電子顯微鏡下呈現柱狀或管狀不等,在不同生長階段呈現不同狀態,
另外環境因素也會造成蠟質成份和含量發生變化。

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葡萄表面蠟質的成份
透過質譜氣相色譜聯用技術測定了多種植物的表面蠟質成份,其中最常見的是長鏈的脂肪族化合物,包含長鏈脂肪酸、醛、醇等。這些化合物都不溶於水,而溶於氯仿等有機溶劑,但氯仿對人體有害,(可以參考這篇:認識化學NG成份,拆穿化學清潔劑的假面),更不建議使用。

所以你不管怎麼用水泡、洗、搓、都不能把這層白霜從葡萄上除掉。

常聽見人說用麵粉、太白粉、蕃薯粉可以清洗掉葡萄上的果粉,其實並不是真的把果粉洗掉了,而是改變了果粉的結構或是把果粉結晶之間的縫隙給填滿了,讓我們的所眼睛的視覺上看不到果粉,但用顯微鏡下看,還是看得到。

左圖為含有蠟質的藍莓皮,右圖為用氯仿去除蠟質的圖片

所以不要再追求把那層白白的果粉洗乾淨了!!

果粒上佈滿濃厚均勻之果粉,是有益身體健康,吃前只將整串清洗乾淨即可,不必一定要洗去果粉。而果園管理作業稍為疏忽,套袋時間過慢、果實未完全成熟,其果粉的數量也是判定品質優良否的指標之一唷!

如果果皮外的白漬為不均勻的點狀分佈,類似洗玻璃窗卻沒擦乾後的殘漬,那就是施藥所殘留的藥斑,藥斑多集中在果粒的下緣,因為施藥後會順著外皮滴落,風乾後的痕漬就成為藥斑,一旦葡萄皮上存有藥斑,就必須將表皮清洗乾淨後,再作食用。

 

 

資料來源:
植物的角質 李正理《生命世界》1978年第04期
植物角質膜的结构、组成和生物學功能研究進展 于海寧等 《生命科學》 2010年Vol. 22, No. 8
葡萄,你搽粉搽多了么?/食品科学硕士 月月

 

作者: 淨毒五郎

以【生活】為出發點,希望提供每個人更多關於環境、健康、居家的知識,幫助大家有更良好的生活品質,創造並享受自己的生活風格,喜愛並認同天然、健康、無毒、環保、行善的事情。

在〈葡萄、李子上的白霜是果粉,白斑點才是農藥!〉中有 34 則留言

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