What Factors Determine The Caffeine Content Of Cold Brew? Some Answers From Science!
Channel: Daniel Rosehill
Date: 2022-10-31

How much caffeine is in your cold brew?

Having watched just about every cold brew recipe on YouTube (okay, just a lot), I think I've boiled it down (sorry for the pun) to three factors:

1: Water temperature: countertop vs fridge
2: Coffee quantity
3: Infusion time 

Intuitively, one would think that grind size would also determine caffeine extraction efficiency, but science shows that it makes minimal difference.

From what I could find online, caffeine recovery seems to peak at about 10 hours. 

Some coverage of the research undertaken at Jefferson by Profs. Niny Rao and Megan Fuller:

https://nexus.jefferson.edu/science-and-technology/the-chemistry-of-cold-brew-coffee/

== Journal articles: ==

The Effect of Time, Roasting Temperature, and Grind Size on Caffeine and Chlorogenic Acid Concentrations in Cold Brew Coffee (Scientific Reports)

https://www.nature.com/articles/s41598-017-18247-4

Extraction of Caffeine. International Journal of Advanced Research in Chemical Science (IJARCS) Volume 6, Issue 9, 2019, PP 11-19
ISSN No. (Online) 2349-0403

https://www.arcjournals.org/pdfs/ijarcs/v6-i9/2.pdf

Measurement and Correlation of Solubility of Theobromine, Theophylline, and Caffeine in Water and Organic Solvents at Various Temperatures

https://pubs.acs.org/doi/10.1021/acs.jced.7b00065

#caffeine #coldbrew #coldbrewcoffee 

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By: Daniel Rosehill 

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