Yeast Inoculated Green Coffee Beans

Yeast Inoculated Green Coffee Beans

Unroasted yeast-inoculated green coffee for roasters. Instead of relying on whatever wild microbes are present, producers add selected yeast strains to the fermentation to steer flavour and make results more repeatable. Our range includes 72-hour yeast fermentations from Brazil and inoculated lots from Colombia. Buy from 0.5kg with samples on most lots – for the post-fermentation step many of these producers pair it with, see thermal shock. Looking for roasted coffee? These are raw beans you roast yourself – here's how to start.

Your guide to Yeast Inoculated Green Coffee Beans

  • How yeast inoculation works

    Coffee ferments naturally with the yeasts and bacteria already on the fruit and in the environment, which makes results variable. With inoculation, the producer adds a chosen culture – commonly strains of Saccharomyces cerevisiae, some developed for coffee, others borrowed from wine or brewing – so it dominates the fermentation. It can be applied to whole cherry or depulped coffee and is often combined with extended or anaerobic fermentation. Our fermentation guide covers the background.

  • What yeast inoculation does to flavour

    Different strains push different results – more florals, tropical fruit, brighter acidity or extra body – but the bigger benefit is consistency: lots behave more predictably from year to year. Well-made inoculated coffees taste clean and fruit-forward rather than funky.

  • Roasting yeast-inoculated coffee

    Treat them like other controlled-fermentation lots: lighter roasts, controlled development, and cup at two levels to find the balance between fruit and sweetness. The Brazilian lots are grown lower and are usually less dense, so they suit a gentler start than the Colombian washed-base lots.

Your questions, answered

What is yeast inoculation in coffee?

Adding a selected yeast culture to coffee during fermentation, so that yeast dominates and steers flavour development instead of wild microbes.

Does yeast inoculation add flavour to coffee?

It doesn't add an ingredient that tastes of anything itself. The yeast changes how the sugars in the fruit and mucilage are broken down, which shapes the flavour compounds that end up in the bean.

Is yeast-inoculated coffee the same as infused coffee?

No. Yeast is a fermentation tool; infused coffees have other ingredients, such as fruit or flavourings, added. See our infused range.

Which yeasts are used for coffee fermentation?

Mostly strains of Saccharomyces cerevisiae – the species used for bread, beer and wine – including some selected specifically for coffee. Producers rarely disclose the exact strain.

Do you offer samples or trial batches before committing to larger orders?

Yes, we offer samples for most of our coffees. If you need a larger sample than what’s typically available, we recommend trying one of the smaller quantity options listed on our site. That way, you can test the coffee before committing to a larger order.

What sizes or quantities can I order?

We offer coffee starting from as little as 0.5kg (1 lb) all the way up to full sacks. If you’re looking for larger quantities than what’s listed on our site, just get in touch! We’d be happy to help you organise and place a custom order. We're here to make sure you get exactly what you need.