Due to the oxidation of (lipid) fats and oils, the quality of green coffee beans quickly deteriorate in traditional bulk size packaging. With the introduction of fully hermetic, protective packaging with aluminum or EVOH barrier film, and the possibility to create & maintain modified gas conditions inside bulk-size packaging, long-term preservation of green coffee beans in bulk bags is now possible.

“Environmental temperature and RH during storage must be controlled to maintain the quality of the coffee without losing its intrinsic sensory characteristics and physicochemical properties. It has been observed that when green coffee is stored at RH above 60 % and temperatures above 25 °C, there can be cell degradation, leading to oil leakage and a loss in the chemical composition of coffee beans.”

(Sedana and Astawa 2016).

“Moisture migration between green coffee and the atmosphere is one of the leading causes of quality  deterioration, as it causes sucrose molecules to polymerize into glucose, which has been associated with “stale crop” flavor.”

(Williams et al, 2017)

“The use of modified atmospheres (vacuum and nitrogen) and two storage conditions (environmental and 18 ºC) allowed the conservation of green coffee beans’ main physicochemical and biological parameters during one year of storage. Storage of GC in modified atmospheres preserved water activity, which is an important quality indicator of this product, as it is closely related to color change, loss of reducing sugars, fungal growth, and OTA production.”

Quote from study “Effect of modified atmospheres storage on physicochemical and biological parameters of arabica Mexican green coffee”. By C. Trujillo-Carretero et al. (Nov. 2021)