Are you making your coffee wrong? Maybe. E+Δ+T Ep. 5
You might be making your coffee wrong. Long got are the days where coffee had to be a bitter muddy substance on the bottom of your coffee filter, or moka pot coffee comes out in need of a strong hit of sugar, or where espresso is strained to the point of next level acridity, while you sit there, and wince through the experience.
No, the time has come to take that barista mentality of perfectionism, and apply it beyond the espresso. That is where this episode of E+Δ+T comes in. This episode, we'll be looking at how temperature and time affect the end product - your coffee, and how we can look at coffee at home a little differently.
Part of what inspired this was the prevalence of what I consider to be appalling coffee in Britain, (with a few positive examples peppered across a sea of muddy sea of Costa, Nero, Pret and Starbucks).
We treat a range of others in the hot drink field with a lot more care, because its more than just a caffeine hit. So why not coffee?
I'd argue the best means of improving your coffee is to experiment with temperature - find a temperature and a extraction time that suits your taste, but always start from low temperature, and work your way up.
The foundation for the parameters of this experiment were founded upon research into coffee in the following article:
The Effect of Time, Roasting Temperature, and Grind Size on Caffeine and Chlorogenic Acid Concentrations in ColdBrew Coffee
https://www.nature.com/articles/s41598-017-18247-4#Sec2
Here, Megan Fuller & Niny Z. Rao performed a series of experiments on cold extraction coffee, using extractions of different roasts and grinds. They noted that peak concentration in both caffeine and acid compounds was reached just after three hundred minutes of extraction time. This, with the addition of my heating stages, became the foundation of my parameters for extraction.
Interestingly, through my research and cut from the video due to time, I also discovered that there are around 10 acid compounds that are extracted and broken down in coffee across temperature and time called chlorogenic acid (CGA) - the study mentioned above focuses on extraction of 3-CGA - while this article,
https://phys.org/news/2007-08-bitter-coffee-chemists-main.html
talks about the chemistry of bitterness in coffee in a broader sense, assessing the mechanics of coffee extraction at home and in coffee shops:
A quote from the article:
"The type of ... method used can also influence the perception of bitterness. Espresso-type coffee, which is made using high pressure combined with high temperatures, tends to produce the highest levels of bitter compounds. While home-extracted coffee and standard coffee shop [results] are relatively similar in their preparation methods, their perceived bitterness can vary considerably depending on the roasting degree of the beans, the amount of coffee used, and the variety of beans used."
Meanwhile, the article below, from Scientific Reports mentions the mechanics of coffee extraction conducted by Australia baristas and international scientists, results which were ultimately published in Matter.
https://www.sciencedaily.com/releases/2020/01/200122110447.htm
A quote from the article:
"Most people in the coffee industry are using fine-grind settings and lots of coffee beans to get a mix of bitterness and sour acidity that is unpredictable and irreproducible," says co-senior author Christopher Hendon (@chhendon), a computational chemist at the University of Oregon. "It sounds counterintuitive, but experiments and modeling suggest that efficient, reproducible [extractions] can be accessed by simply using less coffee and grinding it more coarsely."
This onslaught of information is interesting enough to tackle coffee at home. It would be interesting to see how much further one could take this.
Further reading:
Consumption of Chlorogenic Acids through Coffee
and Health Implications
- Adriana Farah * and Juliana dePaula Lima
Effect of extraction temperatures on tannin content and antioxidant activity of Quercus infectoria (Manjakani)
- M.Z.Iylia Arinaa, Y.Harisun
https://www.sciencedirect.com/science/article/abs/pii/S1878818118308788#:~:text=At%20minimum%20temperature%20of%2050,approximately%2091.9%25%20of%20antioxidant%20activity.