烘焙程度如何改变咖啡的酸度和苦味？

Chocolate, Coffee & Drinks

Research suggests that darker roasting generally reduces coffee’s acidity or sourness, while its effect on bitterness is less firmly established. A study using an electronic tongue found that roast level significantly affected measured bitterness and acidity, but the reported summary does not say whether either one rose or fell. So, in practical terms, darker coffee often tastes less bright and may seem more bitter, but the bitterness change depends on the coffee and roasting conditions.

Roasting changes coffee chemistry. Studies report that chlorogenic acids and titratable acidity tend to decline as roasting becomes darker, although acidity can briefly rise during roasting and depends on the roast profile. Research has clearly linked roast level with bitterness, but the studies described here do not establish one universal bitterness trend. Bean origin, roast temperature and timing, grind size, and brewing method also matter.

What this answer does not cover

• This synthesis uses titles and abstracts, not a full-text systematic review.
• Bibliographic index coverage and metadata can be incomplete or delayed.
• Retraction and publication-status metadata can be incomplete across connected indexes.
• Paper quality and risk of bias were not independently assessed.
• The assessment is based on supplied titles and abstracts rather than full papers.
• The clearest direct evidence for bitterness reports that roast level affects it but does not give the direction of the change.
• Chemical acidity, titratable acidity, perceived sourness, and sensory bitterness are related but not identical measures.
• Results varied with coffee origin, roast profile, and brewing conditions, so they may not apply equally to every coffee.

Papers used (8)

1. Impact of Coffee Roasting and Grind Size on Acidity and Bitterness: Sensory Evaluation Using Electronic Tongue — Chemosensors, 2024
2. The effect of roast profiles on the dynamics of titratable acidity during coffee roasting — Scientific Reports, 2024
3. Online determination of coffee roast degree toward controlling acidity — Journal of Near Infrared Spectroscopy, 2020
4. The Effect of Time, Roasting Temperature, and Grind Size on Caffeine and Chlorogenic Acid Concentrations in Cold Brew Coffee — Scientific Reports, 2017
5. Quantification of Caffeine and Chlorogenic Acid in Green and Roasted Coffee Samples Using HPLC-DAD and Evaluation of the Effect of Degree of Roasting on Their Levels — Molecules, 2021
6. Chlorogenic Acid Content of Local Robusta Coffee at Variations of Roasting Temperature — Jurnal Pendidikan Fisika Indonesia, 2022
7. The Analysis of Chlorogenic Acid and Caffeine Content and Its Correlation with Coffee Bean Color under Different Roasting Degree and Sources of Coffee (Coffea arabica Typica) — Processes, 2021
8. Evidence of different flavour formation dynamics by roasting coffee from different origins: On-line analysis with PTR-ToF-MS — International Journal of Mass Spectrometry, 2014

Answer last checked 2026-10-13T07:41:18.329Z. Answerlog reads titles and abstracts, not full papers, and does not assess study quality or claim consensus.

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