QR Science Journey · Scan 02
C₁₆H₁₈O₉
A family of coffee compounds shaped by the green seed, processing, roasting and brewing.
Molecular structure
Architecture
The name “chlorogenic acids” covers a family of related esters, commonly linking caffeic acid and quinic acid. Their linked rings and oxygen-rich functional groups influence solubility, chemical reactivity and sensory development. Their contribution to a finished cup varies with species, origin, processing, roast and brewing.
Mechanism
The hydroxyl groups can participate in antioxidant reactions in laboratory systems, including hydrogen and electron transfer. That chemical property does not automatically become a health outcome in a person; absorption, metabolism, dose and the whole diet all matter. TÉMΔK therefore presents the molecule as coffee chemistry—not as a treatment claim.
Roasting fate
Chlorogenic acids are an important family of polyphenols in green coffee. Roasting changes their concentration and structure while also creating new compounds that contribute to colour, aroma and bitterness. The final cup depends on the bean, process, roast and brew; one number cannot honestly describe every coffee.
Design translation
The TÉMΔK molecular pattern study translates chlorogenic-acid architecture into a branching lattice rendered in the approved navy, copper and green system. Unlike caffeine’s compact fused-ring form, chlorogenic acids offer a more open visual language: linked structures with hydroxyl groups extending outward.
The translation principle follows the hydroxyl groups. Each OH group in the molecule becomes a branching arm in the pattern — a radiating motif that echoes the hydrogen-bond network chlorogenic acid forms in aqueous solution. The catechol pair on the caffeic ring generates the tightest cluster of branches; the quinic ring's three OH groups produce a wider, more distributed spread across the surface.
The result is a pattern that reads differently at different scales: close up, a dense branching lattice; from a distance, an organic, almost botanical geometry. TÉMΔK green references plant origin, while copper marks the linking architecture without implying a health effect.
Translation notes
From leaf to cup
Biosynthesis · Shikimate Pathway
Coffee plants form chlorogenic acids through phenylpropanoid metabolism. Enzymes link hydroxycinnamic-acid units with quinic acid, producing related isomers including 5-caffeoylquinic acid. Their abundance changes across tissues, development and growing conditions.
Green bean · a variable molecular family
Green coffee contains several chlorogenic-acid isomers in amounts that vary by species, variety, environment and processing. A farm, altitude or cultivar should never be assigned a precise value without a measured lot result.
The Roast Gradient · 180–230°C
Roasting transforms chlorogenic acids through isomerisation, lactone formation and degradation while many other reactions create aroma, colour and body. Darker roasting generally leaves less of the original family, but the result depends on the starting coffee and roast profile; TÉMΔK will not assign a percentage without a measured sample.
Extraction · Polarity & Solubility
Chlorogenic acid is highly water-soluble due to its multiple hydroxyl groups and ionisable carboxylic acid. In hot water extraction at 92–96°C, it dissolves readily in the early phase of the pull. A light-roast espresso or filter brew retains a meaningful fraction of the surviving chlorogenic acid from the bean; longer contact times and lower temperatures — cold brew, 12–24 hours — extract even more of the residual content without further thermal degradation during brewing.
In the Body · Absorption & Metabolism
Chlorogenic acids are transformed during digestion, with both human enzymes and gut microbes contributing to smaller metabolites. People differ in exposure and response, so this journey does not convert coffee chemistry into a personal medical promise.