COLD BREW COFFEES – SOME SCIENTIFIC CONSIDERATIONS

COLD BREW COFFEES – SOME SCIENTIFIC CONSIDERATIONS

Cold brew isn’t just iced coffee. The chemistry, the sensory science, and the microbiology all prove it. 🧪

3 angles. many peer-reviewed studies. 1 beverage most people still underestimate.

SENSORY In a blind triangle test (n=25), 20 out of 25 assessors correctly identified cold brew as distinct from hot brew — statistically significant at α=0.001. 17 preferred cold brew. The reasons consumers give? Smooth, less sour, less bitter. That’s not marketing copy. That’s measured sensory science. Notably, when different coffee varieties were compared as nitro cold brews, untrained consumers couldn’t reliably distinguish them — suggesting preparation method matters more than bean origin at this level.

CHEMICAL GC-MS analysis identified 94 volatile compounds. 9 key aroma compounds with OAV ≥1 — including pyrazines (nutty, roasted, potato notes), methylbutanals (cocoa, malty), and methyl furfuryl disulfide, the sulfury-roasted coffee note that disappears completely by day 45 of storage. NMR kinetics show most compounds plateau between 20 and 140 min. Caffeine: ~140 min. Trigonelline: ~40 min. Lactic acid: ~20 min. The 16-hour brew most producers use? Chemically, often longer than necessary.

MICROBIOLOGY No heat kill step = a real, documented risk. A survey of 23 commercial cold brew samples found 9% with elevated microbial contamination. One contained Bacillus cereus — stored 5 days. Cold brew pH 4.9–6.0 feels smooth on the palate but does NOT inhibit yeast, mould, or lactic acid bacteria growth.

Rule: prepare fresh. Consume same day. Discard after 24h unless O2-controlled.

Wang et al. (2024) LWT, 197, 115919 · Claassen et al. (2021) Foods, 10, 865

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