{"id":185357,"date":"2025-03-11T09:24:18","date_gmt":"2025-03-11T14:24:18","guid":{"rendered":"https:\/\/dailycoffeenews.com\/?p=185357"},"modified":"2026-03-09T09:53:24","modified_gmt":"2026-03-09T14:53:24","slug":"cold-brew-research-temperature-and-time-less-impactful-than-roast-level","status":"publish","type":"post","link":"https:\/\/dailycoffeenews.com\/2025\/03\/11\/cold-brew-research-temperature-and-time-less-impactful-than-roast-level\/","title":{"rendered":"Cold Brew Research: Temperature and Time Less Impactful than Roast Level"},"content":{"rendered":"<p><a href=\"https:\/\/dailycoffeenews.com\/2025\/03\/11\/cold-brew-research-temperature-and-time-less-impactful-than-roast-level\/cold-brew-8\/\" rel=\"attachment wp-att-185366\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-185366\" src=\"https:\/\/dailycoffeenews.com\/wp-content\/uploads\/2025\/01\/cold-brew.jpg\" alt=\"cold brew\" width=\"1240\" height=\"1550\" srcset=\"https:\/\/dailycoffeenews.com\/wp-content\/uploads\/2025\/01\/cold-brew.jpg 1240w, https:\/\/dailycoffeenews.com\/wp-content\/uploads\/2025\/01\/cold-brew-240x300.jpg 240w, https:\/\/dailycoffeenews.com\/wp-content\/uploads\/2025\/01\/cold-brew-496x620.jpg 496w, https:\/\/dailycoffeenews.com\/wp-content\/uploads\/2025\/01\/cold-brew-120x150.jpg 120w, https:\/\/dailycoffeenews.com\/wp-content\/uploads\/2025\/01\/cold-brew-768x960.jpg 768w, https:\/\/dailycoffeenews.com\/wp-content\/uploads\/2025\/01\/cold-brew-1229x1536.jpg 1229w\" sizes=\"auto, (max-width: 1240px) 100vw, 1240px\" \/><\/a><\/p>\n<p>Traditional full-immersion &#8220;cold&#8221; brewing may not demand as much time as it often receives for optimal sensory results, according to relatively new research from a team at the <a href=\"https:\/\/www.ucdavis.edu\/\" target=\"_blank\" rel=\"noopener\">University of California, Davis<\/a>.<\/p>\n<p>Published last August <a href=\"https:\/\/www.nature.com\/articles\/s41598-024-69867-6#Sec20\" target=\"_blank\" rel=\"noopener\">in the journal&nbsp;<em>Scientific Reports<\/em><\/a>, the study sheds new light on how finished &#8220;cold&#8221; brews \u2014 whether brewed cold, at room temperature or hot and then chilled \u2014 are affected by brew time, brew temperature and roast level of the coffee.<\/p>\n<p>For example, the study suggests that shorter extraction times in cold or room temperature brews \u2014 such as eight hours as opposed to 24 hours \u2014 might offer comparable flavors and other sensory characteristics, while making operations more efficient for brewers of commercial coffee products.<\/p>\n<p>&#8220;Our analyses consistently found that brew time was the least substantial driver of sensory differences among the full immersion brewed coffee samples compared to roast level and temperature,&#8221; the study, led by graduate researcher Jiexin (Jessie) Liang, states.<\/p>\n<p>The most substantial driver of sensory differences was the roast level of the brewed coffee.<\/p>\n<div id=\"attachment_185364\" class=\"wp-caption alignnone\" ><a href=\"https:\/\/dailycoffeenews.com\/2025\/03\/11\/cold-brew-research-temperature-and-time-less-impactful-than-roast-level\/41598_2024_69867_fig5_html\/\" rel=\"attachment wp-att-185364\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-185364\" src=\"https:\/\/dailycoffeenews.com\/wp-content\/uploads\/2025\/01\/41598_2024_69867_Fig5_HTML.webp\" alt=\"41598_2024_69867_Fig5_HTML\" width=\"1972\" height=\"2359\" srcset=\"https:\/\/dailycoffeenews.com\/wp-content\/uploads\/2025\/01\/41598_2024_69867_Fig5_HTML.webp 1972w, https:\/\/dailycoffeenews.com\/wp-content\/uploads\/2025\/01\/41598_2024_69867_Fig5_HTML-251x300.webp 251w, https:\/\/dailycoffeenews.com\/wp-content\/uploads\/2025\/01\/41598_2024_69867_Fig5_HTML-518x620.webp 518w, https:\/\/dailycoffeenews.com\/wp-content\/uploads\/2025\/01\/41598_2024_69867_Fig5_HTML-125x150.webp 125w, https:\/\/dailycoffeenews.com\/wp-content\/uploads\/2025\/01\/41598_2024_69867_Fig5_HTML-768x919.webp 768w, https:\/\/dailycoffeenews.com\/wp-content\/uploads\/2025\/01\/41598_2024_69867_Fig5_HTML-1284x1536.webp 1284w, https:\/\/dailycoffeenews.com\/wp-content\/uploads\/2025\/01\/41598_2024_69867_Fig5_HTML-1712x2048.webp 1712w\" sizes=\"auto, (max-width: 1972px) 100vw, 1972px\" \/><\/a><p class=\"wp-caption-text\">Sensory attributes with significant differences by temperature and roast level across all time points, with different letter codes indicating significant difference.<\/p><\/div>\n<p>For the study, the research team used Salvadoran and Nicaraguan arabica coffees roasted on a Probat drum roaster at the <a href=\"https:\/\/coffeecenter.ucdavis.edu\/\" target=\"_blank\" rel=\"noopener\">UC Davis Coffee Center<\/a>, under the watch of coffee roasting expert Juliet Han. The coffees were used to create a &#8220;light&#8221; roast blend, and a &#8220;medium-dark&#8221; roast blend, with respective Agtron readings of 41.8 and 71.8.<\/p>\n<p>The blends were then brewed at three different temperatures (4 \u00b0C, 22 \u00b0C, and 92 \u00b0C), to five different time points, from what might be practically described as a flash-chilled hot brew to an extended cold brew with total dissolved solids (TDS) reaching equilibrium.<\/p>\n<p>Thirty samples were measured for TDS, titratable acidity and pH, while the sensory properties were evaluated using descriptive analysis by a calibrated panel of 14 coffee tasters. The coffees were served to panelists cold (about 6\u00b0C, warming to about 12\u00b0C during the tasting window).<\/p>\n<div id=\"attachment_185365\" class=\"wp-caption alignnone\" ><a href=\"https:\/\/dailycoffeenews.com\/2025\/03\/11\/cold-brew-research-temperature-and-time-less-impactful-than-roast-level\/41598_2024_69867_fig7_html\/\" rel=\"attachment wp-att-185365\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-185365\" src=\"https:\/\/dailycoffeenews.com\/wp-content\/uploads\/2025\/01\/41598_2024_69867_Fig7_HTML.webp\" alt=\"41598_2024_69867_Fig7_HTML\" width=\"2004\" height=\"1518\" srcset=\"https:\/\/dailycoffeenews.com\/wp-content\/uploads\/2025\/01\/41598_2024_69867_Fig7_HTML.webp 2004w, https:\/\/dailycoffeenews.com\/wp-content\/uploads\/2025\/01\/41598_2024_69867_Fig7_HTML-300x227.webp 300w, https:\/\/dailycoffeenews.com\/wp-content\/uploads\/2025\/01\/41598_2024_69867_Fig7_HTML-620x470.webp 620w, https:\/\/dailycoffeenews.com\/wp-content\/uploads\/2025\/01\/41598_2024_69867_Fig7_HTML-150x114.webp 150w, https:\/\/dailycoffeenews.com\/wp-content\/uploads\/2025\/01\/41598_2024_69867_Fig7_HTML-768x582.webp 768w, https:\/\/dailycoffeenews.com\/wp-content\/uploads\/2025\/01\/41598_2024_69867_Fig7_HTML-1536x1163.webp 1536w\" sizes=\"auto, (max-width: 2004px) 100vw, 2004px\" \/><\/a><p class=\"wp-caption-text\">Sensory attributes with significant differences by roast level, temperature, and time point, with different letter codes indicating significant difference.<\/p><\/div>\n<p>&#8220;A wide range of flavor profiles were achieved from a single source green coffee blend through combination of these factors, with roast level as the biggest driver of flavor, followed by temperature, then the longer brew time points as TDS plateaued,&#8221; the article states.<\/p>\n<p>However, different combinations yielded different, sometimes surprising, results. For example, the effect of time was more pronounced at lower brewing temperature, but it also depended on roast level for specific sensory attributes.<\/p>\n<p>&#8220;For dark roast, the changes in bitter and burnt attributes were significant over time in fridge and room brews, while the changes in hot brews remained relatively stable,&#8221; the study states. &#8220;Conversely, sour and citrus had more pronounced differences for light roast at lower temperature brews.&#8221;<\/p>\n<p>In short, there&#8217;s no one right way to brew cold coffee.<\/p>\n<p>It should be noted that the research \u2014 part of a larger cold brew research project supported by the nonprofit <a href=\"https:\/\/coffeescience.foundation\/\" target=\"_blank\" rel=\"noopener\">Coffee Science Foundation<\/a> \u2014 was underwritten by cold brewing systems maker <a href=\"https:\/\/www.toddycafe.com\/\" target=\"_blank\" rel=\"noopener\">Toddy LLC<\/a>. The authors declared no competing interests.<\/p>\n<hr>\n<p><em>Comments? Questions? News to share? <a href=\"https:\/\/dailycoffeenews.com\/contact\/\" target=\"_blank\" rel=\"noopener\">Contact DCN\u2019s editors here<\/a>. For all the latest coffee industry news,&nbsp;<a href=\"https:\/\/dailycoffeenews.com\/e-news-subscribe\/\" target=\"_blank\" rel=\"noopener\">subscribe to the DCN newsletter<\/a>.&nbsp;<\/em><\/p>\n<div class=\"crp-list-container\"><h3 class=\"crp-list-title\">Related Posts<\/h3><div class=\"crp-list\"><div class=\"crp-list-item crp-list-item-image-none\"><div class=\"crp-list-item-title\"><a href=\"https:\/\/dailycoffeenews.com\/2024\/12\/31\/coffee-research-in-2024-focused-on-climate-change-quality-and-human-health\/\" target=\"_blank\">Coffee Research in 2024 Focused on Climate Change, Quality and Human Health<\/a><\/div><\/div><div class=\"crp-list-item crp-list-item-image-none\"><div class=\"crp-list-item-title\"><a href=\"https:\/\/dailycoffeenews.com\/2025\/02\/25\/coffee-science-foundation-and-ohio-state-to-study-how-consumers-value-coffee\/\" target=\"_blank\">Coffee Science Foundation and Ohio State to Study How Consumers Value Coffee<\/a><\/div><\/div><div class=\"crp-list-item crp-list-item-image-none\"><div class=\"crp-list-item-title\"><a href=\"https:\/\/dailycoffeenews.com\/2025\/02\/10\/coffee-science-foundation-and-zhaw-launch-defects-research-project\/\" target=\"_blank\">Coffee Science Foundation and ZHAW Launch Defects Research Project<\/a><\/div><\/div><div class=\"crp-list-item crp-list-item-image-none\"><div class=\"crp-list-item-title\"><a href=\"https:\/\/dailycoffeenews.com\/2024\/11\/26\/do-light-roasts-or-dark-roasts-have-more-caffeine-study-maybe-medium\/\" target=\"_blank\">Do Light Roasts or Dark Roasts Have More Caffeine? 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of&#8230;<\/p>\n","protected":false},"author":103,"featured_media":185365,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"ngg_post_thumbnail":0,"footnotes":""},"categories":[58320902,35627,9038],"tags":[58321169,58347669,58331891,58320156,58320563,58322995,58321867,58322373],"class_list":["post-185357","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-craftoperations","category-company-news","category-coffee-roasting","tag-cold-brew","tag-jessie-liang","tag-juliet-han","tag-research","tag-science","tag-toddy","tag-uc-davis","tag-uc-davis-coffee-center"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Cold Brew 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