Preserving Specialty coffee beans: Ensuring pure aroma

Storage is key in keeping Specialty coffee at its best. The main principles include avoiding exposure to air, moisture, heat, and light. Proper storage safeguards the beans’ subtle flavors, freshness, aroma, and unique texture, ensuring they remain flavorful even after long transport and storage periods.

However, due to their sensitivity, maintaining the peak aroma of coffee beans for long periods is challenging. Poor storage conditions can quickly lead to aroma loss and a decline in quality, which can be easily detected. Without optimal storage conditions to protect the beans, environmental factors can compromise their quality, leading to issues like mold and loss of flavor.

In places with poor preservation conditions, the loss of aroma and quality degradation of coffee beans happens quickly and is distinctly noticeable

Moisture: Coffee beans are hygroscopic, meaning they absorb moisture from their surroundings. Excessive moisture can promote mold and bacterial growth, rapidly degrading the quality and flavor of the beans.

Air and Oxygen: Oxygen is one of coffee’s biggest enemies. Exposure to oxygen causes the beans to oxidize, diminishing their flavor and the presence of certain aromatic notes.

Light: Coffee beans are highly sensitive to light, especially ultraviolet (UV) rays. Prolonged exposure to light can degrade the quality of the coffee and diminish its distinctive aroma.

Temperature: Coffee beans are best preserved at cool and stable temperatures. High temperatures can accelerate the aging process and cause the oils in the coffee to spoil.

Specialty coffee beans can be affected by environmental factors like temperature, humidity, and light

To retain the refined and concentrated aromas in each coffee bean, it’s essential to control external factors rigorously.

Moisture Control: Coffee beans can mold if too damp, while overly dry beans may lose flavor and aroma. According to the International Coffee Organization, the ideal moisture content for storing green coffee beans is between 11% and 12.5%. Storage areas, such as roasteries, should maintain humidity levels between 60% and 65% consistently throughout the storage period. This involves controlling humidity in storage facilities and during transportation. Additionally, preventing air circulation inside coffee bags is crucial to minimize oxidation and moisture-related spoilage.

Temperature Management: Temperature affects coffee by influencing the water activity within the beans. Changes in the energy state of water molecules can impact freshness and flavor. Fluctuations in temperature can cause condensation inside coffee bags, leading to spoilage and mold. It’s recommended to store coffee beans at room temperature, ideally between 20-25 degrees Celsius, in a cool location with minimal sudden temperature changes. Maintaining a stable temperature is vital for preserving volatile compounds that contribute to the beans’ aroma.

Light Exposure: UV light exposure can degrade organic compounds within the beans, reducing the volatile compounds that provide aroma, thus diminishing the overall scent. Continuous exposure to light can also create new, potentially unpleasant flavors. To maintain freshness and prevent the evaporation of key aromatic compounds, it is important to shield coffee beans from light.

Managing and limiting environmental conditions within acceptable limits is essential to preserve the delicate aromas encapsulated in each coffee bean

The ideal storage time for Specialty coffee beans generally ranges from 6 to 12 months from the date they are processed or packaged. The exact duration can vary depending on the variety and processing method. After 12 months, most coffee batches are considered past their prime, with diminished quality and value. Over time, coffee can lose its freshness and fail to retain its complex layers of flavor, leading to the development of undesirable tastes that negatively impact the user experience.

Typically, older coffee beans may develop additional flavors perceived as stale or flat due to moisture, condensation, exposure to extreme temperatures, and oxidation processes. These flavors include:

– Cereal or grain-like flavors

– Baggy (similar to the smell of burlap bags)

– Woody

– Cardboard

– Papery

– Musty

– Straw or dried grass

Properly managing these factors can help maintain the quality of coffee beans and extend their usability within the optimal storage period.

The optimal storage period for Specialty coffee beans is typically between 6 and 12 months from processing or packaging

For preserving green Specialty Coffee beans, producers often seek solutions to maintain quality for as long as possible. Experts agree that beyond optimizing storage conditions, investing in high-quality packaging is an effective strategy to minimize changes over time.

Optimal Packaging Solutions

The most effective and commonly used method for preserving coffee involves high-barrier, waterproof packaging. Given that it’s challenging to maintain an ideal environment consistently—free from sunlight, air, and other elements—producers and traders are adopting multi-layer packaging strategies. These typically involve using multi-layer plastic, vacuum-sealed inner bags, and possibly an outer layer of jute or another waterproof material to better shield the beans from external factors.

Professor Borém from the Agricultural Engineering Department at the Federal University of Lavras conducted research that highlights the effectiveness of waterproof packaging layers. Results indicated significant quality differences over time between beans stored in permeable versus waterproof bags. For example, coffee with an initial score of 85 – 86 stored in permeable bags dropped below 80 after nine months and below 75 after 18 months. In contrast, coffee in waterproof bags maintained scores of 83–84 after 12 months and only dropped to 82 after 18 months.

Using highly water-resistant packaging is considered a popular and effective method to preserve coffee

Preservation Approach at XLIII Coffee

Focusing on enhancing customer experience, XLIII Coffee adopts advanced preservation methods to ensure optimal product quality. The beans are stored in GrainPro vacuum-sealed bags, made from highly durable and impermeable polyethylene (PE). This material effectively blocks moisture and air, preserving the coffee’s freshness naturally and safely without chemicals. GrainPro bags also offer the added benefits of being biodegradable and recyclable, aligning with XLIII Coffee’s commitment to environmental sustainability and responsible consumption, reducing plastic waste and promoting community sustainability.

Specialty coffee beans at XLIII Coffee are carefully stored in multi-layered GrainPro and vacuum-sealed packaging

Proper preservation of Specialty Coffee is an essential step in maintaining product quality up until delivery to the customer, safeguarding the sustained efforts of the entire production chain.

Preservation: The key to a delicious cup of coffee

Whether a cup of coffee can captivate discerning consumers and touch the hearts of those eager to discover new experiences largely depends on the freshness of the raw coffee beans. Farms work tirelessly day and night, harvesting carefully to select the finest beans as the foundation for subsequent stages. However, this precious freshness faces the risk of gradual degradation over time due to exposure to oxygen, temperature, humidity, and light. In this context, preservation acts like a strong shield, protecting the vulnerable coffee beans from external factors. This protection ensures that the beans meet the demands of the roasting process, elevating the flavor to new heights.

Coffee packaging can have a negative environmental impact

The role of preservation demonstrated through moisture control

During roasting, the moisture content of green coffee beans impacts the chemical reactions that develop flavor. According to the International Coffee Organization, the ideal moisture content for coffee beans ranges from 8% to 12.5%. If the moisture level falls outside this range, roasters cannot maximize the quality of the coffee.

Preservation enhances sustainable relationships with partners

Different countries have various food safety regulations, but all these rules aim to protect consumer safety. Coffee beans, as a traded commodity, need to be free from contamination and safe for consumers. Preservation is a crucial step in ensuring that green coffee beans remain clean and uncontaminated. Producers must store coffee in a sealed, dry, cool environment with moderate humidity to prevent the intrusion of insects and other pathogens. Through proper preservation, green coffee beans can be certified as pollutant-free before being sent to roasting facilities.

Overall, effective preservation strategies not only enhance the intrinsic quality of coffee beans but also support sustainable business practices by maintaining excellent standards and fostering trust among trade partners.

Preservation is a crucial step in keeping coffee beans clean and maintaining consistent quality

Traditional preservation methods like using sealed packaging and storing coffee on pallets in clean warehouses have proven their value over time. However, as the industry evolves, more modern and convenient technologies have emerged to optimize the quality of Specialty coffee beans, including the innovative technique of freezing green coffee beans. This method effectively halts oxidation processes.

Freezing coffee beans for long-term quality maintenance

At temperatures below 0 degrees Celsius, moisture levels decrease, which helps prevent external environmental contact with the coffee. In this cold environment, microbial activity and chemical reactions slow down, significantly reducing the risk of disease, evaporation of aromatic compounds, and the formation of unwanted flavors. The coffee beans undergo no internal or external changes, thus retaining their freshness and plumpness.

Research by Dedan Kimathi University on freezing coffee revealed that coffee beans lose only a small amount of moisture in the first three weeks. Beyond that period, the beans undergo little change. After the experiment, coffee beans were removed from the freezer, roasted at a medium level, and surprisingly, the beans were still very aromatic. Experts described the experience with frozen coffee as unique and memorable, with a full body and rich flavor, lively acidity, and a sweetness that remained as vivid as when it was first harvested

How to achieve optimal results with coffee bean freezing?

1. Clean and controlled freezing environment: When implementing freezing technology for coffee preservation, it’s crucial to clean the freezer thoroughly and maintain humidity levels between 11% and 12.5%. This prevents frost from affecting the quality of the beans.
2. Isolated storage: Coffee is highly sensitive to odors and can absorb smells from other foods. To preserve its original aromatic notes, ensure that green coffee beans are stored in a dedicated freezer.
3. Thawing the coffee: The water inside the beans directly influences the development of aromas, especially since water activity post-thawing can be unpredictable under normal conditions. This can complicate the roasting process. Therefore, producers should allow the beans to thaw naturally to preserve the water and aromatic compounds within the beans.

When using freezing technology for coffee preservation, it is crucial to clean the freezer thoroughly and maintain humidity levels between 11% and 12.5%

Conclusion

Optimizing the storage of Specialty coffee beans involves meticulous attention to every small detail—from packaging selection to specific storage conditions. These beans are more than just commodities; they represent the culmination of careful cultivation and commitment to sustainability. Proper preservation practices not only enhance the enjoyment of each cup but also uphold and celebrate the intrinsic value of these exceptional beans. Let each sip reflect the pristine and nuanced flavors of perfectly preserved Specialty coffee.

Image source provided and collected by partner farm XLIII Coffee

Q1: What environmental factors affect the quality of green coffee beans?

A1: Environmental factors constantly pressuring green coffee beans include moisture, air, light, and temperature. Excessive moisture can facilitate mold and bacteria growth, reducing the coffee’s quality and flavor. Air and oxygen can lead to oxidation, diminishing the beans’ aromatic notes. Prolonged exposure to light degrades the quality and scent of coffee, while high temperatures can accelerate the aging process and spoil the coffee oils.

Q2: What are the optimal environmental conditions for storing green Specialty coffee beans?

A2: The ideal conditions for storing green Specialty coffee beans are:

– Humidity: The International Coffee Organization recommends maintaining a humidity level of 11% – 12.5% for green coffee beans. The storage area’s humidity should be kept between 60% and 65%.

– Temperature: It’s best to store the beans at room temperature, specifically between 20 – 25 degrees Celsius, in a cool place with minimal sudden temperature fluctuations.

– Light: Beans should be shielded from light to preserve freshness and prevent the evaporation of key aromatic compounds.

Q3: How can contamination of green coffee be avoided?

A3: To minimize the risk of contaminating green coffee, it’s important to:

– Keep storage areas dry and clean.

– Use pallets for storing and transporting coffee.

– Avoid storing coffee near fertilizers, pesticides, or other chemicals.

– Regularly inspect the coffee’s condition in storage.

– Store coffee away from heat sources like stoves, ovens, or direct sunlight.

Q4: What is the most effective and common method for preserving green coffee beans?

A4: Producers and suppliers of Specialty Coffee often opt for high-barrier, waterproof packaging as the most effective method to preserve coffee, especially during transportation. This method involves using multi-layer plastic packaging, vacuum sealing the interior, and sometimes adding an additional outer layer of jute or another waterproof material to better protect the beans from external factors.

Q5: Why do producers strive to find preservation solutions for Specialty Coffee?

A5: Preserving Specialty Coffee is crucial for maintaining product quality up to the point of delivery, protecting the enduring efforts of previous activities in the production chain. This step ensures that the coffee beans remain clean and meet the requirements needed for the roasting process, enhancing the flavor. Moreover, finding and implementing better preservation methods demonstrates the producers’ responsibility, ethics, and credibility in the industry. This not only helps maintain sustainable relationships with partners and clients but also ensures that their coffee fetches a good price.