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How much time for a Single Shot (7 grams) extraction?
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nkbsbl
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Joined: 11 Oct 2013
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Posted Mon Mar 17, 2014, 1:55pm
Subject: How much time for a Single Shot (7 grams) extraction?
 

I purchased a single shot basket (and single spout portafilter (Elektra)) for my wife, as double shots are too much caffeine for her. The single shot basket holds max 7 grams. For my double shot portafilter I generally fill with ~14 grams, extract in 25-30 seconds, yielding ~2 oz shot. What should I be aiming for with the single shot in terms of extraction time. I know it should yield ~ 1 oz -> should extraction time also be 25-30 seconds, or should it be less? Thanks so much for your help!
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boar_d_laze
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Posted Mon Mar 17, 2014, 4:41pm
Subject: Re: How much time for a Single Shot (7 grams) extraction?
 

About the same time... maybe a little less.  Call 22sec - 27sec ideal for a single.  

That said, let's look at one of the more important rules of Espresso 101:
Rather than looking for a specific volume in a given time range, you'd be better off looking for a specific "blonde point" in that given time range.  

Then you can compute your brew ratio by dividing the weight of the completed shot by the weight of the dose.  Weight and color tell you much more about the shot than volume.  That's because the shot's density varies according to the amount aeration and crema

What's the blonde point?
As the coffee extracts, the stream gets progressively lighter going from brown to tiger-striped brown and tan; to lighter tan (aka "blonde"); to translucent lighter still tan; and so on.  A ristretto is tiger-striped, a normale is just at border of tiger-striping and blonde, while a lungo is well and truly blonde, bordering on translucent.

Counter intuitively, a ristretto -- even though it's a shorter (less weight) pull, should take a  more time to extract than a normale, and a normale should a little more time than a lungo.  That's because a more concentrated extraction benefits from a slower flow rate.  

At the end of the day, taste wins.  Time, weight, dose and grind are not the goal -- just the things you manipulate to reach it.  

Hope this helps,
Rich
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calblacksmith
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calblacksmith
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Posted Tue Mar 18, 2014, 6:34am
Subject: Re: How much time for a Single Shot (7 grams) extraction?
 

There is a myth that espresso has MORE caffeine than regular coffee and that is not true. The extraction of caffeine from the ground coffee is a function of TIME more than anything else. A double shot has LESS caffeine than an 8 oz cup of drip coffee.

Like BDL said, the time will be slightly more but not less than a double. Honestly, singles are a whole different animal and the grinder needs to be adjusted for them differently than for a double. Why not do what nearly EVERY coffee shop does when a customer orders a single shot, simply serve half of the coffee brewed. It is a PITA for them to make a single and as the spouts split the shot anyway, only use one spout for her, then you get an extra shot for you!

 
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RobbW
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RobbW
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Posted Fri Apr 11, 2014, 11:04am
Subject: Re: How much time for a Single Shot (7 grams) extraction?
 

Many people also mistakenly assume that a darker, bolder roast has a higher caffeine content.  Not true.  A lighter roast has more caffeine because the caffeine gets roasted out of the beans as the roast gets darker!  Want a bigger jolt in your morning brew?  Go for a City roast over a French roast.  Heck, roast your own and dump the beans at a cinnamon roast for super caff!  Woo hoo!  Feel the buzz!
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Sashas
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Posted Sat Apr 12, 2014, 1:55pm
Subject: Re: How much time for a Single Shot (7 grams) extraction?
 

RobbW Said:

Many people also mistakenly assume that a darker, bolder roast has a higher caffeine content.  Not true.  A lighter roast has more caffeine because the caffeine gets roasted out of the beans as the roast gets darker!  Want a bigger jolt in your morning brew?  Go for a City roast over a French roast.  Heck, roast your own and dump the beans at a cinnamon roast for super caff!  Woo hoo!  Feel the buzz!

Posted April 11, 2014 link

It really depends on how you measure the caffeine. The caffeine itself doesn't go anywhere (maybe a bit but barely measurable)
If you measure by weight you actually have more caffeine in dark roast because the water loss is faster than the caffeine loss. If you measure by volume you have less caffeine because the beans expand as they roast.
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RobbW
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RobbW
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Posted Sat Apr 12, 2014, 8:32pm
Subject: Re: How much time for a Single Shot (7 grams) extraction?
 

Sashas Said:

If you measure by weight you actually have more caffeine in dark roast because the water loss is faster than the caffeine loss.

Posted April 12, 2014 link

True to a point.  If you weigh the coffee post-roast, a pound of dark roast could potentially have the same caff content as a pound of light roast.  That's because it takes more dark-roasted beans (by volume) to equal a pound due to the greater weight loss from roasting dark.  However, if you start off with two equal batches of green coffee beans each weighing a pound, you will have a much different story.  Roast one batch to a light roast and the second to a dark roast, and the end result will be much more caff in the light roast batch.  The caff is burned off in the roasting process.  So going dark will burn off more caff.
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Frost
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Frost
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Posted Sat Apr 12, 2014, 9:39pm
Subject: Re: How much time for a Single Shot (7 grams) extraction?
 

Better double check your information source on that Robb, as Sasha has it right; Light or dark roasts, only a trace amount of caffeine is lost in the roasting while bean volume increases and weight decreases with darker roasts.
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