The antioxidants in coffee are mostly chlorogenic acids, a family of polyphenols that make up 3.5 to 14 percent of the dry weight of a green coffee bean depending on species. How much of that survives into the cup is decided by four things: species, origin, processing method, and roast level.
This guide gives the numbers for each, plus what to put on a purchase order if antioxidant content is part of your product claim. Indonesia Specialty Coffee grades and exports green beans, so we have written it from the green side of the trade, which is where antioxidant content is set long before a roaster touches it.
Last updated: 23 September 2026
What Are the Antioxidants in Coffee?
The antioxidants in coffee are a mixed group of compounds, not one substance. Four of them account for most of the measured activity, and two of the four do not exist in the bean until you roast it.
- Chlorogenic acids (CGA) are the dominant group in green coffee and the reason coffee registers so high on dietary antioxidant surveys. The most abundant single form is 5-O-caffeoylquinic acid.
- Melanoidins are formed during roasting through the Maillard reaction. Melanoidins carry real antioxidant capacity and contribute colour and body.
- Trigonelline partially degrades during roasting into nicotinic acid and pyridines, which is also where a share of roasted coffee aroma comes from.
- Caffeic acid and the other phenolic acids sit behind chlorogenic acids in volume but add to total capacity.
Our guide to the chemical composition of coffee beans covers where each of these sits alongside the lipids, sugars, and proteins in a green bean.
Here is how coffee compares to other common beverages on total antioxidant capacity, measured per gram of dry material:
| Beverage | Serving size (g) | Total antioxidant capacity (mg/g) |
|---|---|---|
| Coffee | 7 to 10 | 150 to 300 |
| Green tea | 2 | 150 to 300 |
| Black tea | 2 | 110 to 200 |
| Cocoa | 10 | 200 to 250 |
Read that table carefully, because most coffee marketing misreads it. Coffee does not beat green tea per gram. Coffee leads dietary antioxidant intake in most Western diets because the serving is three to five times larger and people drink it more often.
How Much Chlorogenic Acid Is in Green Coffee Beans?
Green coffee beans carry the highest chlorogenic acid content of any form of coffee, and the number drops from the moment heat is applied. Conventional roasting degrades roughly 40 to 90 percent of the chlorogenic acid present in the green bean.
In the cup, a 100 ml serving of brewed coffee contains between 50 and 200 mg of chlorogenic acids depending on brewing method, roast level, and variety, according to a 2019 review in Beverages. Espresso sits at the top of that range because of pressure extraction and a high coffee-to-water ratio. Filtered and drip coffee sit at the bottom.
Chlorogenic acid content in green coffee varies more by genetics than by anything a farm does afterwards. The figures below are per 100 g of green coffee:
| Green coffee sample | Total CGA per 100 g |
|---|---|
| Wild C. canephora (average) | 11.3 |
| C. canephora cv. Conillon (Brazil) | 9.47 |
| C. canephora cv. Robusta | 8.80 |
| C. liberica cv. Dewevrei | 6.97 |
| C. arabica (average) | 6.88 |
| Catimor (Timor hybrid x C. arabica) | 6.31 |
| C. arabica var. Bourbon | 5.67 |
| Wild C. arabica (average) | 4.10 |
Source: Farah, phenolic compounds in coffee, 2006.
Arabica vs Robusta vs Liberica: Antioxidant Content by Species
Species is the single largest variable in the antioxidants in coffee, larger than processing and larger than roast level. Robusta (Coffea canephora) contains 7 to 14 percent chlorogenic acids by dry weight. Arabica (Coffea arabica) contains 3.5 to 7.5 percent. Liberica (Coffea liberica) falls between the two and swings widely by origin.
| Species | CGA (% dry weight) | Typical cup character | Specialty grade viability |
|---|---|---|---|
| Robusta | 7 to 14 | Heavy body, woody, low acidity, high bitterness | Most lots grade below the 80 SCA point specialty threshold |
| Arabica | 3.5 to 7.5 | Cleaner acidity, defined origin character | Routinely 82 to 88 SCA points at Grade 1 |
| Liberica | Variable, origin-dependent | Jackfruit, floral, distinctive and divisive | Specialty lots exist but the market is thin |
The Liberica figure deserves its own note, because it is where the most recent Indonesian data sits. A 2026 study of Indonesian Liberica green beans from Jambi, Kayong, and Meranti found that geographic origin had a significantly larger effect on chlorogenic acid content and antioxidant activity than post-harvest processing did. Meranti recorded the highest of the three. We supply Liberica green beans from Indonesian smallholder plots for buyers working in this category.
That finding cuts against how most high-antioxidant coffee is sold. Brands lead with roast level and processing. The data says start with species, then origin.
Sourcing green coffee for a light-roast or high-CGA product line? See our current wholesale pricelist or contact our team for lot specifications and samples.
How Processing Affects Antioxidant Content in Coffee
Processing changes antioxidant content measurably, but less than species does. Indonesian coffee is processed in two steps, and only the first one meaningfully touches the chemistry that matters here.
Step 1 is the cherry processing method: full-washed, semi-washed, natural process, honey process, or wine process. Step 2 is the hulling method: dry-hulled at roughly 12 to 13 percent moisture, or wet-hulled (Giling Basah) at 35 to 40 percent moisture, which defines Sumatran, Sulawesi, and Flores character. Our guide to coffee processing methods covers each in detail.
A 2022 study in LWT compared natural, washed, honey, anaerobic fermentation, and carbonic maceration across coffees from Nicaragua, Ethiopia, Peru, and Burundi. Chlorogenic acid content differed significantly between the green coffees. Antioxidant capacity differed significantly after roasting too, but not in one consistent direction: Burundian naturals recorded the highest capacity of any sample in the experiment, while in the Peruvian lots carbonic maceration outperformed natural.
The honest reading is that processing moves the number, and the direction depends on the coffee. If you need a specific antioxidant figure for a product claim, you cannot infer it from the processing label on the bag.
How Roasting Changes Coffee Antioxidants
Roasting runs two opposite reactions at once. Roasting destroys chlorogenic acids and it builds melanoidins. Which one wins depends on how much chlorogenic acid the green bean started with, which brings the species question back around.
Total antioxidant capacity measured before and after roasting, by origin:
| Species | Origin | TAC green (mg/g) | TAC roasted (mg/g) | Direction |
|---|---|---|---|---|
| Arabica | Tanzania | 34 | 43 | Increase |
| Arabica | Ethiopia (Yirgacheffe) | 32 | 40 | Increase |
| Arabica | Brazil | 30 | 41 | Increase |
| Robusta | Bali | 65 | 63 | Decrease |
| Robusta | Uganda | 67 | 55 | Decrease |
The pattern is consistent, and it is the opposite of what most articles on this topic claim. Arabica starts low in chlorogenic acid, so melanoidin formation adds more than roasting takes away and total capacity rises. Robusta starts high, so roasting destroys more than it creates and total capacity falls. Roasting does not universally increase antioxidants. Roasting increases them in Arabica and reduces them in Robusta.
Across roast levels, light roasts retain the most chlorogenic acid and dark roasts the least, with some studies placing peak total antioxidant activity at medium rather than light.
Here is the mistake we see most often. A roaster asks us for our highest-antioxidant lot and then specifies a dark roast for the flavour profile. Those two requests cancel each other out.
What Antioxidant Content Means When You Buy Green Coffee
Antioxidant content is not a line item on any Indonesian green coffee spec sheet, including ours. What you get on a contract is species, varietal, altitude, processing, moisture content, defect value, and cupping score. Everything in this article has to be read through those.
Specify these on your purchase order:
- Species and varietal, not a marketing label. This is the largest lever you have.
- Altitude and origin, because the Liberica data shows origin outweighing processing.
- Moisture content, capped at 12.5 percent under SNI 01-2907-2008 Grade 1. Green coffee is not chemically stable in a warehouse, and wetter lots degrade faster.
- Defect value at 11 or below for Grade 1 Specialty, assessed against the SCA cupping protocol alongside the score.
One thing worth saying plainly: if chlorogenic acid content is the basis of a label claim or a health positioning, do not take any exporter’s word for it, ours included. Pull a 1 kg sample and have it assayed. No Indonesian exporter we know of runs CGA analysis on every lot as standard.
This article covers coffee chemistry, not medical advice. Associations between coffee consumption and health outcomes reported in observational research are not treatment claims. Consult a clinician for personal health questions.
Frequently Asked Questions
Which coffee has the most antioxidants?
Unroasted green coffee beans hold the most, with chlorogenic acid reaching up to 14 percent of dry weight in Robusta. Among roasted coffee, light roasts retain more chlorogenic acid than dark roasts. Robusta outranks Arabica, and Liberica sits between them depending on origin.
Do green coffee beans have more antioxidants than roasted coffee?
Green coffee beans hold more chlorogenic acid, losing roughly 40 to 90 percent during conventional roasting. Total antioxidant capacity is a separate question, because roasting forms melanoidins that carry activity of their own. For chlorogenic acid specifically, green wins. For total capacity, it depends on species.
Does dark roast have fewer antioxidants than light roast?
Dark roast holds less chlorogenic acid than light roast, because roasting degrades it progressively. Dark roast gains melanoidins in exchange. Studies measuring total antioxidant capacity generally place light roasts highest, though some report medium roast peaking. Specify roast level if antioxidant retention drives your product.
Does Robusta have more antioxidants than Arabica?
Robusta contains 7 to 14 percent chlorogenic acid by dry weight against 3.5 to 7.5 percent for Arabica, so Robusta leads on the dominant antioxidant group. The trade-off is cup quality. Most Robusta grades below the 80 SCA point specialty threshold.
Does processing method affect coffee antioxidants?
Processing changes antioxidant activity measurably, though less than species or origin. Research comparing natural, washed, honey, anaerobic fermentation, and carbonic maceration found significant differences between them. In Indonesian Liberica, geographic origin had a larger effect on chlorogenic acid than processing method did.
Where can I buy green coffee beans with high chlorogenic acid wholesale?
Indonesia Specialty Coffee supplies Arabica, Robusta, and Liberica green beans from Medan, shipping FOB Belawan. Order tiers start at 1 kg for cupping samples, then 60 kg microlot, 350 kg wholesale, and container loads from 9 MT. Contact us for a quote.
Buy High-Antioxidant Green Coffee Beans from Indonesia Specialty Coffee
Indonesia Specialty Coffee exports Indonesian green coffee across the range this article covers: Arabica from Gayo, Bali Kintamani, Toraja, Flores, Java, Mandheling, and Lintong, Robusta from Lampung, and Liberica. We ship Grade 1 Specialty only, graded against SNI 01-2907-2008 at 82 to 88 SCA points, maximum 12.5 percent moisture, FOB Belawan from Medan, North Sumatra. All lots are Halal certified, with Organic and Rainforest Alliance available on request.
Order tiers run 1 kg for a cupping sample, 60 kg microlot, 350 kg standard wholesale, and container loads from 9 MT quoted per metric tonne. Current pricing sits at [confirm current price with ISC pricelist].
Building a light-roast or high-CGA line and want the numbers on a specific lot? Start with a 1 kg sample, cup it, and send it for assay before you commit. See our green coffee beans or contact our team for a wholesale quote.
