- In coffee, fermentation is a biological process carried out by micro-organisms mainly yeasts and bacteria. During the coffee maceration, the LALCAFÉ™ yeasts help firstly to degrade the mucilage from the coffee (demucilagination) due to their specific enzymatic activities and secondly, at the onset of fermentation, the yeasts, due to their specific metabolism, they reveal and enhance the sensory potential of the coffee.
- Fermentation and extended maceration have considerable impact on the final coffee quality, because they contribute directly to the sensory profile of the coffee. LALCAFÉ™ yeasts control the fermentation, yielding a higher quality and more predictable product due to their efficiency and metabolic profile.
- During the maceration (the step after demucilagination, which should be roughly half of your standard fermentation time when using LALCAFÉ™ yeasts) , the LALCAFÉ™ yeasts help to protect the coffee from the growth of undesirable indigenous microflora that can produce spoilage characteristics, defects or simply unwanted flavors.
- With a maceration step in processing, LALCAFÉ™ yeasts will help reveal the unique varietal aromatic character of your coffee.
- Each yeast is unique and has its own metabolism which will impact the demucilagination and the final sensory quality.
- LALCAFÉ™ yeasts have been characterized and selected for their capabilities to maintain and improve coffee fermentation and quality during coffee processing. Many studies carried out by several research and technical centers recognized by the coffee sector (CIRAD, WASI…) have confirmed the positive impact of selected yeasts on coffee quality.
- Better control the fermentation (avoid over fermentation, and spoilage indigenous flora contamination),
- Accelerate coffee demucilagination,
- Facilitate washing (reduction in water used),
- Depending on the LALCAFÉ™ yeasts used and the duration of the maceration, they will more or less impact the aroma expression of your coffee. These impacts have been shown on wine, beer and other fermented beverages.
- We recommend fermentation duration of 18 to 48h; the optimum will vary depending on desired flavor profile, the size of the fermentation mass, and environmental conditions at the wet mill.
- Even though demucilagination is complete, continued contact may benefit flavor development, LALCAFÉ™ yeasts need more time to reveal the coffee aromas.
- Yeasts are produced in dry form (active dry yeast) to make their transportation and storage easier. They need to be rehydrated before use.
- First, they must be rehydrated in 10 time the volume of water (10 liters for 1kg).
- The rehydration water must be clean (no smell, no chemicals inside), and between 15 and 37°C except for LALCAFÉ INTENSO™ (25-37°C).
- Stir in gently the yeast into the water to avoid lumps.
- Leave for 20 minutes.
- Inoculation (adding the yeast for the coffee fermentation) is done as soon as possible after receiving fruit at the mill. For whole fruit we recommend utilizing a tank as one would with depulped processing to facilitate inoculation. . How the yeast is added to the fermentation tank is determined by the style of processing and the quantity of coffee to ferment:
- Up to 1,000 kg: put coffee in the tank then add the yeast at once then stir. The tank must be free of any chemicals or other compounds which could contaminate the coffee.
- From 1,000 kg to 5,000 kg, split the yeast addition. Add half of the yeast dosage when the tank is half-filled and then add the rest of the yeast addition once the tank is filled.
- “Dry” processing (depulped or whole fruit with no additional water except for the rehydration liquid)
- Introduce 25% of the rehydrated yeast as soon as the tank is 25% filled and stir to ensure even distribution. Continue with 25% increments until tank is full. If processing whole fruit, it may be wise to utilize a sprayer to ensure coverage and prevent unnecessarily damaging the coffee skin if the vessel is larger than 30L.
- Once yeast is rehydrated never leave it at ambient temperature for more than 30 minutes. You should prepare the yeast in function of the filling of the fermentation tank. If a tank takes 4h to be filled and you would like to make 3 inoculations, it will be better to do the yeast rehydration just before each inoculation.
- Overdosing will have no impact on end coffee quality.
- It will not reduce fermentation time.
- On the other hand, using too low of a yeast dosage will show no difference compared to your normal process or your coffee quality.
- You must keep yeast in a cold and dry place (the best condition is at 4°C). Shelf-life is 2 years for LALCAFÉ CIMA™, 3 years for LALCAFÉ INTENSO™, 4 years for LALCAFÉ ORO™ and LALCAFÉ BSC™.
- Avoid storage in hot place (up to 30°C) for more than 6 months.
- Once the bag is opened, use as rapidly as possible (during the following 15 days and it is best to close it and keep it at 4°C away from humidity).
Note: For any further questions, do not hesitate to reach out to our team who are here to support you in the processing of your coffee.