Doctoral Program in Biosciences, Faculty of Engineering, Universidad de La Sabana, Campus Universitario Puente del Común, Km. 7 Autopista Norte, Bogotá 25001, Colombia.
Grupo de Investigación en Procesos Agroindustriales, Universidad de La Sabana, Campus Universitario Puente del Común, Km. 7 Autopista Norte, Bogotá 25001, Colombia.
Food Res Int. 2021 Mar;141:110141. doi: 10.1016/j.foodres.2021.110141. Epub 2021 Jan 18.
This study evaluated the effects of different roasting profiles (time/temperature) and brewing methods on the physicochemical and sensory characteristics of coffee brews. Cold brewing (dripping and immersion) and hot brewing (French press) methods were studied to understand the effects of water temperature and technical brewing method conditions on the chemical compound extraction in coffees roasted at high-temperature short time (HTST) and low-temperature long time (LTLT). The results showed that coffee beverages were clearly differentiated concerning the roasting profile when hot water was used (90 ± 3 °C) in brewing. Separation of beverages according to the water temperature used in brewing was observed. Notably, hot brewing coffees were distinguished from cold brewing (19 ± 2 °C) based on a higher titratable acidity and abundance of some furan compounds. The non-volatile extraction rate increased at higher brewing temperatures. At the same brewing temperature, dripping exhibited a higher extraction rate than immersion brewing, which suggests that the coffee extraction process is affected by the design and operation of the cold brewing system. Coffee beverages brewed with HTST and cold dripping displayed the highest value in total dissolved solids (TDS), extraction yield, as well as the highest caffeine, trigonelline, 4- and 5-caffeoylquinic acids (CQAs) contents. Regardless of the roasting profile, coffees brewed by cold dripping were perceived with more bitter and roasted flavors. In contrast, cold immersion and hot coffee beverages showed remarkable sweetness, nutty, caramel, and malt attributes. In turn, these attributes showed an inverse correlation with caffeine concentration, trigonelline, CQAs, and TDS. The findings of this study demonstrate that volatile and non-volatile compounds present in roasted coffee depend on time-temperature roasting conditions; in turn, their presence in the resulting beverages are related to the extraction of the operational conditions of coffee brewing methods.
本研究评估了不同烘焙曲线(时间/温度)和冲泡方法对咖啡冲泡物理化和感官特性的影响。研究了冷萃(滴滤和浸泡)和热萃(法式压滤壶)方法,以了解在高温短时间(HTST)和低温长时间(LTLT)烘焙条件下,水温及技术冲泡方法条件对咖啡中化学化合物提取的影响。结果表明,当热水(90 ± 3°C)用于冲泡时,咖啡饮料在烘焙方面有明显的差异。观察到根据冲泡用水温度对饮料进行分离。值得注意的是,与冷萃(19 ± 2°C)相比,热萃咖啡的可滴定酸度和一些呋喃化合物的丰度更高。在较高的冲泡温度下,非挥发性提取率增加。在相同的冲泡温度下,滴滤的提取率高于浸泡冲泡,这表明咖啡的提取过程受到冷萃系统设计和操作的影响。用 HTST 和冷滴滤冲泡的咖啡饮料具有最高的总溶解固体(TDS)、提取率以及最高的咖啡因、葫芦巴碱、4-和 5-咖啡酰奎宁酸(CQAs)含量。无论烘焙曲线如何,用冷滴滤冲泡的咖啡都具有更苦和烘焙的味道。相比之下,冷浸泡和热咖啡饮料则具有明显的甜味、坚果味、焦糖味和麦芽味。反过来,这些属性与咖啡因浓度、葫芦巴碱、CQAs 和 TDS 呈负相关。本研究的结果表明,烘焙咖啡中存在的挥发性和非挥发性化合物取决于时间-温度烘焙条件;反过来,它们在所得饮料中的存在与咖啡冲泡方法的操作条件的提取有关。
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