咖啡为什么会苦?

       经常会有人问小窝,为什么咖啡喝起来,会是苦的?那究竟是什么东西让咖啡显苦味?让小窝带大家一起来揭开咖啡苦味的根源。

nipic_12443929_20140928100416932000-1

       咖啡的苦,一直被众人所争议。有人说:不苦怎么叫咖啡?有人说:好的咖啡有一种愉快的苦。还有很多人说:好咖啡不应该有苦味!苦是不好的!
       而咖啡究竟为什么会苦呢?什么又叫愉快的苦呢?
       提到咖啡的苦味成分,或许大多数人的第一反应就是——咖啡因!那咖啡因真的是当了个冤大头了!事实证明,咖啡因的苦味成分源自于生豆,是有余韵的苦味,它的影响力最多也只有10%左右。那究竟咖啡带来苦味的主要成分是什么呢?

%e5%92%96%e5%95%a1%e5%9b%a0%e7%bb%93%e6%9e%84
       为了解开这个困扰多年的谜,德国「Technical University of Munich」的科学家「Thomas Hofmann」决定对咖啡的苦味加以研究。他将煮好的咖啡进行过滤,发现一些分子量最小的分子味道最苦。于是他用质谱分析法,进行了一连串的实验,确定了其中名叫——绿原酸内酯「chlorogenic acid lactone」的分子,是罪魁祸首(为了方便下文我们把它称为小绿吧~)。那这个小绿是从生豆开始就有的吗?

2525
       要说小绿的话,我们就要先说说绿原酸。简单来说,绿原酸存在于大多数的植物中,它是植物体在有氧呼吸过程中产生的。而小绿就是咖啡豆在烘焙过程中,从绿原酸中分解出来的。那烘焙程度对小绿有影响吗?
       为此,研究人员对一系列不同烘焙程度的咖啡,进行了小绿含量的测定。研究表明,咖啡豆在烘焙过程中,小绿会随着烘焙程度的加深而增加。在轻度和中度烘焙时,小绿只会产生温和的苦味,也就是我们所说的具有咖啡特色的,愉快的苦味。而随着烘焙时间的加长,小绿会被再次分解,取而代之的是乙烯儿茶酚聚合物,这也就是产生浓烈苦味物质的源头。

coffeetree
       这样我们就不难理解,为什么咖界有句话是——浅烘酸,深烘苦了。而我们所谓的愉快的苦味就是绿原酸,不愉快的苦味就是乙烯儿茶酚聚合物了。那是不是绿原酸越多就能制造出具有咖啡特色苦味的好咖啡呢?
       答案当然也是否定的,一般咖啡生豆中的绿原酸含量越多,杯测时品质越差。很多瑕疵豆的绿原酸也很多,因此并不是绿原酸越多越好。再好比,罗布斯塔咖啡豆中含有的绿原酸含量就有7%—11%,而阿拉比卡咖啡豆绿原酸含量就只有5%-8%。

fod-365325

       那深烘焙的咖啡豆是不是不好呢?一杯咖啡是由30多种化学物质构成的复杂饮料,而正是这些“化合物”决定着咖啡的味道、香气和酸性。并不是深烘焙产生的苦不好,而是每一款咖啡豆都有适合它的烘焙程度。烘焙师会根据每一款咖啡豆的特性,多次的杯测,选择一个最适合的烘焙度,完美的展现每款咖啡豆特有的风味。

7,967 thoughts on “咖啡为什么会苦?

  1. cosplay costumes Reply

    Fantastic beat ! I wish to apprentice while you amend
    your website, how could i subscribe for a blog website?

    The account helped me a acceptable deal. I have been tiny bit acquainted of this your broadcast offered vibrant transparent
    idea

  2. Trade Bitcoin Reply

    It’s a pity you don’t have a donate button! I’d
    without a doubt donate to this excellent blog! I suppose for now i’ll settle for book-marking and adding your RSS feed to my Google account.
    I look forward to brand new updates and will share this site with my Facebook group.
    Chat soon!

  3. Angelia Boring Reply

    I actually wanted to construct a simple message so as to appreciate you for the remarkable tactics you are placing at this site. My extensive internet lookup has finally been recognized with sensible facts and strategies to share with my family and friends. I would state that that most of us readers actually are undoubtedly endowed to exist in a magnificent network with very many special individuals with helpful opinions. I feel very happy to have discovered the website page and look forward to many more enjoyable minutes reading here. Thanks a lot again for everything.

  4. golf Reply

    I precisely wanted to appreciate you once more. I am not sure the things that I might have implemented without those information provided by you on this industry. It was a very distressing circumstance for me, but witnessing a new professional mode you handled it took me to leap over delight. Extremely happier for this advice as well as believe you recognize what a great job that you are accomplishing instructing many people with the aid of your webblog. More than likely you have never encountered all of us.

发表评论

电子邮件地址不会被公开。