A New Chapter for Indonesian Robusta: Exploring Fermentation with Gambir Catechins

An exploration of Indonesian coffee, gambir catechins, and the possibilities of fermentation.

A tea drinker might describe a cup through its texture, its balance, or the impression it leaves behind. Coffee invites the same attention. Beyond the first aroma lies a quieter question: what makes you want another sip?

At Salimbado Coffee in West Sumatra, that question has led us to explore robusta fermentation with catechins derived from gambir (Uncaria gambir).

Catechins—儿茶素 (ér chá sù)—are familiar from the world of tea. Finding them in a coffee-processing story creates an unexpected connection between two drinks, without adding tea to the coffee.

A Familiar Compound in Unfamiliar Territory

Gambir extracts have already appeared in coffee research. A 2023 study examined instant robusta formulations incorporating crude gambir catechin extract, using coffee from natural anaerobic, honey, and fully washed processing methods. The formulations affected total phenolic content, laboratory antioxidant activity, and several physical properties.

That gives the idea a scientific starting point. It also leaves an interesting question open: what happens when catechins become part of fermentation itself?

The distinction matters. Adding extract to a coffee formulation and introducing catechins during fermentation are different treatments. Results from one cannot simply be claimed for the other.

For us, this is where product development becomes worth pursuing: an ingredient with published research behind it, a process to investigate, and a finished cup to evaluate.

The Surprising Part: Catechins Can Taste Bitter

Catechins are often discussed for their antioxidant properties, but their contribution to taste deserves equal attention. Research on tea catechins shows that they can produce both bitterness and astringency, with different catechins creating different sensory intensities.

Bitterness is a taste. Astringency is the drying or puckering sensation in the mouth.

This makes the challenge more interesting than simply adding a promising ingredient. More catechin does not automatically mean better coffee, and fermentation does not automatically mean a smoother cup. The real work lies in finding a pleasing balance—and showing that it can be reproduced.

What Fermentation Brings to the Story

Research on robusta fermentation has reported improvements in cupping scores under the conditions studied. Separate work using Lactobacillus plantarum found changes in chlorogenic acid and laboratory antioxidant activity at particular fermentation stages.

These findings suggest room to develop robusta through processing. They do not establish one ideal method for every coffee.

With added gambir catechins, the questions become more specific: how does the treatment affect the cup? Does it change mouthfeel or finish? Can tasters consistently distinguish it from coffee processed without the addition?

Those answers must come from comparisons and testing of the finished product.

Three Moments Worth Tasting

You do not need a technical vocabulary to explore this coffee. Start with three moments:

入口 — The first sip
Notice what arrives first. Is the impression gentle, intense, bright, or bitter?

口感 — The mouthfeel
Pay attention to texture. Does the coffee feel light, full, smooth, or drying?

余韵 — The lingering finish
After swallowing, pause. What remains—and does it make you want another sip?

These are questions to explore, rather than flavours we ask you to expect. They offer tea and coffee drinkers a shared way to discuss what is in the cup.

A Better Conversation About Benefits

The published coffee-and-gambir studies support further investigation into phenolic content and antioxidant activity. They do not prove that our coffee delivers a particular health benefit.

For consumers, the most useful benefits must be tangible: an enjoyable drinking experience, clear information about the process, and quality that remains consistent from one batch to another.

For cafés and roasteries in China, this approach offers an opportunity for joint tasting and recipe development. A black coffee can reveal its basic character; a milk-based drink offers another test of balance. The best application should be discovered through tasting.

An Invitation from West Sumatra

Salimbado Coffee is exploring robusta with gambir-derived catechins added during fermentation, bringing two Indonesian raw materials into one development story.

We invite coffee drinkers and prospective partners in China to explore that story through samples, questions, and shared tasting notes.

Begin with curiosity. Take a sip. Tell us what you find.
带着好奇，品尝一口，分享你的发现。

Address

KH. Ahmad Dahlan Street
Payonibung, North Payakumbuh
Payakumbuh City, West Sumatra 26251
Indonesia

Contacts

Sepdi Tito E P

Phone / WhatsApp : +62 812-1314-3540
WeChat ID : sepditito
Email : info.salimbadogroup@gmail.com

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