cocoa bean drying
process / process-cocoa-bean-drying
カカオ豆の乾燥
Reducing moisture in cocoa beans after fermentation. Drying conditions and bitterness or astringency in later samples must be read in light of confounding with fermentation conditions.
On this page (7 sections)
Reading the bitterness
Cocoa bean drying reduces moisture in fermented beans to prepare them for storage. It serves a different process role from roasting. Beyond water loss alone, its relationship with bitterness and astringency of later cocoa liquor needs to be checked under stated conditions.
In an experiment comparing beans from 2 sites in Ecuador, liquor from beans dried at 80°C was rated more bitter and astringent than liquor from those dried at 60°C. However, the 60°C group was also fermented about 8–10 hours longer. Higher drying temperature alone cannot be identified as the cause, and this experiment cannot establish the general rule 「高温乾燥は必ず苦くなる」 (in translation: "high-temperature drying always increases bitterness").
In a trial with Ghanaian cocoa beans, a sample fermented for 6 days was divided into 3 lots of about 500 g each and dried by 3 methods: sun-drying, a 60°C convection oven, and a modified oven reproducing the temperature and humidity course of sun-drying. All 3 lots were dried for 8 hours a day, with the beans turned every 2 hours, paused overnight, and continued until moisture reached 7.5%. This study set a common turning interval, overnight pause, and endpoint to compare chemical characteristics by drying method, and did not evaluate human-perceived bitterness or astringency.
In another report that dried mixed Trinitario fermented beans in a cocoa house, a greenhouse, and a 40°C intermittent oven, the liquor's cocoa flavor score on a 0-10 scale was 5.0, 4.3, and 4.0, with the cocoa-house lot significantly higher. Bitterness and astringency were also assessment items, but the report text only states that the differences were small, without giving values or the number of panelists. Bitterness differences by drying method cannot be quantified from this source.
Sources for this overview
Checked for this overview: Supports the purpose of reducing moisture after fermentation to prepare for storage. / Supports treating drying and roasting as separate process steps.
Checked for this overview: Supports the link to sensory comparison of liquor made from dried beans. / Supports the comparison result within the study's sample scope. / Makes explicit the confounding of temperature and fermentation duration.
Effects of Different Drying Techniques on the Post‐Harvest Quality of Fermented Cocoa Beans in Ghana
Checked for this overview: Supports the representative post-fermentation sample split into 3 lots of about 500 g each, the 3 drying methods, the 8-hour daily drying with turning every 2 hours, the overnight pause, the 7.5% moisture endpoint, the comparison by drying method, and the limitation that this is not sensory data.
Checked for this overview: Supports the 3 drying methods, the 0-10 scale, the 3 cocoa-flavor values and their significant difference, and the fact that bitterness and astringency values and the number of panelists are not stated.
Follow the connections
cocoa bean drying →differs from→ cocoa roasting →reduces→ bitterness
Structured claims — open a section to read each claim's confidence, evidence and limits
Sensory (2)
Scope: Nacional samples from 2 sites in Ecuador, compared without pod storage. The 60°C group also had longer fermentation.
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process-cocoa-bean-drying —was_observed_with→ "Liquor made from beans dried at 80°C was rated more bitter and astringent than the 60°C group."Scope: Mujaffar et al. 2017 international symposium report; 3 drying methods, with the liquor evaluated in 3 replicates.
Note: The number of panelists is not stated. Bitterness and astringency were also evaluated on a 0-10 scale, but the text only states that the differences were small and does not give values by attribute. The beans dried to an equilibrium moisture of 4.6-6.3%, below the 7% storage standard given in the report.
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process-cocoa-bean-drying —has_sensory_response→ "In a 0-10 intensity evaluation of liquor from mixed Trinitario fermented beans, cocoa-flavor scores were 5.0 for cocoa-house drying, 4.3 for greenhouse drying, and 4.0 for 40°C intermittent-oven drying, with the cocoa-house lot significantly higher (p≤0.05)."How processing and cooking change it (3)
Scope: ICCO's organization of the process.
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process-cocoa-bean-drying —is_defined_in_context_as→ "A step that reduces moisture in cocoa beans after fermentation to prepare them for storage."Scope: ICCO's process chart lists drying and roasting as separate steps.
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process-cocoa-bean-drying —differs_from→ process-cocoa-roastingScope: Haruna et al. 2025; a representative post-fermentation sample of 1.5 kg was divided into 3 lots of about 500 g each.
Note: Temperature and humidity in the sun-drying and modified-oven lots fluctuated over the course of the day. There was no human sensory evaluation of the 3 lots, so no effect on bitterness or astringency is shown. The correspondence between the 1.5 kg split and the 3 fermentation replicates, and the number of independent drying replicates, are not clear.
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process-cocoa-bean-drying —is_documented_using→ "Ghanaian Hybrid 7 beans fermented for 6 days were divided, spread in 1 layer, into sun-drying, 60°C convection-oven drying, and modified-oven drying reproducing the temperature and humidity course of sun-drying; each lot was turned every 2 hours over 8 hours in 1 day, paused overnight, and dried to 7.5% moisture."