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brewing coffee news

Unlocking Coffee’s Secret Chemistry

Hello, fellow coffee nerds! ☕️🔬

I have always wondered how my coffee brew gets its zing. What makes up that “Golden Cup” of coffee? Why is one cup extraordinarily great and the next good but not quite that good, even though you used the same beans, same grinder, same water, same brew method?

The art of being a good barista is that you’re able to make a great coffee every single time. Turns out it’s not just about coffee beans and water, it’s actually a whole chemistry lab in your cup! 🧪

Five years ago, the Simonelli Group reached out to the Coffee Science Foundation, asking if they could somehow work together on cutting-edge espresso research? That open question in 2019 led to the start of an exciting multi-year research project by Professor Christopher Hendon at the University of Oregon, that wants to measure the chemistry that goes on in your cup of espresso.

That initial conversation led to a truly exciting initiative—a multi-year research project aimed at measuring espresso chemistry, correlating those measurements to sensory attributes, and laying the groundwork for science-based useable tools for the coffee industry.

Long story short: scientists are using electricity to break down what’s in your espresso. How do chemical compounds affect the taste of the cup of coffee and the flavors that you experience? 🤯

We all know coffee can taste amazing, but it can also be a rollercoaster of flavors. Is it the beans, the roast, the water, or your barista skills? 🤔 Turns out, it’s all of these things, plus a bunch of tiny molecules we’re just starting to understand.

Traditionally, we’ve always measured coffee strength using TDS (Total Dissolved Solids) – basically, how much coffee stuff is dissolved in the water. Coffee is still 98-99% water. But here’s the thing: you can have two cups with the same TDS that taste totally different. 🤯 That’s because TDS doesn’t tell us what kind of stuff is dissolved, just how much.

This is where electrochemistry comes in. It’s like using a tiny electric probe to see what molecules are in your coffee and how many of them there are. Different molecules react to electricity in different ways, so we can use this characteristic to create a kind of “fingerprint” of your brew.

This is super cool for a few reasons. First, it can help us understand how things like roast level, brewing time, and even the type of beans affect the flavor. 🔬 Second, it could lead to new tools for baristas to dial in their espresso perfectly every time. 🤩

The research is still ongoing, but the possibilities are endless. Imagine being able to measure the exact chemical makeup of your coffee and adjust your recipe to create the ultimate flavor experience. 🤤

So, next time you’re sipping your latte, remember: there’s a whole world of science behind that deliciousness. And who knows, maybe one day you’ll be using electrochemistry to brew the perfect cup! ☕️😎

Source: Amped Up: Using Electricity to Detect and Quantify Molecules in Brewed Coffee | 25, Issue 18

Categories
brewing competition news

Preliminary rounds of Dutch Brewers Cup 2022

This year I can finally participate in something that’s been a dream of mine since I started working with coffee in 2017 and getting certified by the SCA… Corona has been forcing the competition to be postponed. I was going to first volunteer and help others participate, but I’ve decided to just dive in.

At the preliminary, you have to brew 3 cups of an unknown coffee bean in 15 minutes using your preferred brew method. You receive the beans on the day of your round and you get 30 minutes in advance to determine your best recipe using the beans provided, water present and a grinder to use.

Time lapse of a practice run

The preliminary is held at Alleborgh coffee in Almere, a well known espresso machine dealer, who has a backoffice practice floor where you can setup. They’ve been cooperating with SCA Nederland forever, as far as I know.

Not knowing the water used and using a guest grinder is an extra complication. Baristas know their own equipment in and out and can fine-tune results often instantly to compensate for dinner ad-hoc deviation

I’m going to double check the requirements again before Tuesday Feb 22nd, when I’m scheduled to go on stage, but I believe you get 15 minutes total time and can use 8 minutes to set up and 7 minutes to produce 3 cups of 180 grams of coffee liquid.

I also learned that you’ll get 15 min additional time familiarize yourself with the grinder (a mahlkonig EK43 🥰) and can bring your own coffee to achieve the grind size you’re set on using. There are tools to help with this task, such as a Kruve sieve or a ruler that indicates particle size, but I don’t have those yet. Maybe if I make the finals…

This is not that hard at all but the complexity increases because you kinda have to brew 3 batches of coffee in parallel and start the 2nd while you’re still brewing the first. This is where timing gets tricky and routine is crucial!

The coffees are judged blindly (they do not know who’s coffee they judge) on flavors, taste and consistency by a professional jury who’ve sampled the same coffee for themselves, so they know what’s possible to achieve. In a way, it’s whoever is closest to what they achieved wins.

Categories
brewing coffee news

The math of brewing a better espresso

Scientists have finally answered a burning question of mine: why should an espresso be brewed in 25 +/- 2 seconds and use approx 15-22gr of dry coffee to yield 50ml of (a double) espresso?

Who came up with this rule and why? Not that I have a specific problem with it but it seems so arbitrary. Also, once you start to make espresso’s a day long, you’ll notice that it’s really hard to dial in the equipment a certain way and maintain those rules for every cup. Sometimes it’ll be 21 seconds, sometimes 29. The grinder is pretty accurate. The beans are practically the same. So where does this high variation come from?

Well, it turns out that brewing your espresso differently yields the same great taste and flavors while achieving this with much greater consistency and reducing the cost per cup of espresso!

How did they do it? Well, they started by reducing the process to a proper model with solid mathematics behind it. Brewing an espresso is basically fluid dynamics of a bed of particles. The “puck” being coffee grinds of varying sizes and water is pushed through this bed at a certain pressure.

These mathematics are very well understood and accepted. So the scientists started with this model, created equations for everything and solved the equations using differential equations. That resulted in a few parameters and then they found the optimal solutions.

Sounds easy enough but believe me the math is pretty impressive, yet their logic is sound.

Turns out if you lower the pressure to 6 bars instead of 9, use 7-15gr of dry coffee, ground more coarse then tradition tells you to and aim for an extraction of 8-15 seconds, you will get a beautiful espresso that is much easier to reproduce!

Don’t believe it? Read the articles:

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news

Proud SCA Member

SCA_MT18_With_Logotype_Stone_CMYK-01I decided to become an official SCA member so that I can showcase my expertise and work towards earning the “Coffee Skills Diploma” with all the courses and training that I’ve been doing.

In addition, it gets me market research reports, a sticker and access to some of the industry’s leading conferences. Most beneficial is, however, the discount you get on additional training!