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啤酒瓶的颜色是如何影响啤酒的口感? – 译学馆
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啤酒瓶的颜色是如何影响啤酒的口感?

How Does the Color of a Glass Bottle Affect the Beer Inside?

啤酒瓶通常只有三种颜色
Beer bottles are typically just three colors.
但酒瓶颜色重要吗?
But does the color matter?
瓶子的颜色决定了
A bottle’s color determines just how much light gets
多少光进入啤酒瓶内
through to the beer inside.
光的影响似乎不大
Light may not seem like a big deal,
但它会引起啤酒的化学反应
but it can cause chemical reactions in beer that
进而影响啤酒的口感
affect the taste.
啤酒商们称这些啤酒“漏光”
Brewers call these beers “lightstruck.”
酒花里使啤酒变苦的分子名为异-α-酸
Molecules from hops known as iso-alpha-acids are what make beer bitter,
同时也使啤酒易受光线影响
but they also make beer vulnerable to light.
可见光在大麦麦芽中的核黄素(也称为维生素B2)的帮助下
Visible light breaks apart these iso-alpha-acids with the help of riboflavin, also known as
分解这些异-α-酸
vitamin B2, from barley malt.
氧自由基作为生成的分子之一
One of the resulting molecules, known as an oxyl radical,
失去氧碳原子
loses oxygen and carbon atoms
变成羰基自由基
and becomes a carbonyl radical.
这些分子渴望与新的伴侣结合
That molecule is eager for a new partner to bond with,
它们发现了大麦麦芽中
and it finds one in sulfhydryl molecules
可见光分解氨基酸时形成的巯基分子
that form when visible light breaks apart amino acids found in barley malt.
当它们配对成功时
When they pair up,
会形成叫3-甲基-2-丁烯-1-硫醇的新化合物
they form a new compound called 3-methyl-but-2-ene-1-thiol, which is
这个名字有点拗口
a bit of a mouthful,
所以它通常称之为3MBT
so it’s often referred to as 3MBT.
3MBT恰好在结构和化学组成上
3MBT happens to be very similar in structure and chemical makeup
与臭鼬独特气味的化合物非常相似
to the compounds responsible for a skunk’s distinctive odor,
品尝到它的概率只有十亿分之几
and we can taste it at just a few parts per billion.
一些啤酒商用经过特殊处理的酒花提取物
Some brewers use specially treated hop extracts
这样异-α-酸就不会分解形成3MBT
so iso-alpha-acids won’t break apart and form 3MBT.
但这些啤酒也可能会有怪怪的味道
But even these beers may not be safe from funky flavors.
光还可以引起一种反应
Light can still cause a reaction
形成一种叫做2-磺酰-3-甲基丁醇的分子
that forms a molecule called 2-sulphanyl-3-methylbutanol,
味道类似洋葱
which tastes like onion.
不同酒瓶颜色能阻挡不同程度的光线
Different bottle colors block different amounts of light.
很明显 透明的瓶子并不能抵御光线
Unsurprisingly, clear bottles offer no protection from light,
绿色的瓶子也差不多
and green bottles aren’t much better.
但一些啤酒商仍然使用它们
But some brewers still use them
顾客也会期待带有一片柑橘的臭味啤酒
and customers have come to expect skunky beer that might require a slice of citrus.
棕色瓶子最常见是有原因的
Amber bottles are most common for a reason.
棕瓶能挡住大量光线而不让啤酒产生臭味
They block the most light, almost completely stopping skunking.
但如果你想避免这些刺激性分子
But if you want to avoid these pungent molecules,
最好的办法是坚持喝罐装啤酒
your best bet is to stick to sipping beer from cans.
我是凯尔西·肯尼迪来自《科学美国人》杂志
For Scientific American, I’m Kelsey Kennedy

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使用啤酒瓶是有一定的讲究,不同颜色的啤酒瓶还能影响啤酒的口感。想知道具体是如何影响的吗?看来看看吧!

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