Tuning the packed bed configuration for selective extraction of espresso non-volatiles based on polarity

Guerra, Mauricio Vaca; Harshe, Yogesh M.; Fries, Lennart; Pietsch‐Braune, Swantje; Palzer, Stefan; Heinrich, Stefan

doi:10.1016/j.jfoodeng.2023.111554

Cited by 4 publications

(1 citation statement)

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“…The fastest decrease was observed for trigonelline and Total Dissolved Solids (TDS), followed by 5-caffeoylquinic acid (5-CQA) and caffeine. This behavior was also described in the literature and correlated with the components' polarity for trigonelline, caffeine, and 5-CQA [39,40]. For comparison, Figure 1 shows the extraction kinetic curves normalized with respect to the corresponding initial concentration c 0 for different components obtained by fitting Equation ( 2) to the experimental data of the design of experiment's (DoE) central point.…”

Section: Extraction Kineticssupporting

confidence: 69%

Influence of Flow Rate, Particle Size, and Temperature on Espresso Extraction Kinetics

Schmieder,

Pannusch,

Vannieuwenhuyse

et al. 2023

Foods

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Brewing espresso coffee (EC) is considered a craft and, by some, even an art. Therefore, in this study, we systematically investigated the influence of coffee grinding, water flow rate, and temperature on the extraction kinetics of representative EC components, employing a central composite experimental design. The extraction kinetics of trigonelline, caffeine, 5-caffeoylquinic acid (5-CQA), and Total Dissolved Solids (TDS) were determined by collecting and analyzing ten consecutive fractions during the EC brewing process. From the extraction kinetics, the component masses in the cup were calculated for Ristretto, Espresso, and Espresso Lungo. The analysis of the studied parameters revealed that flow rate had the strongest effect on the component mass in the cup. The intensity of the flow rate influence was more pronounced at finer grindings and higher water temperatures. Overall, the observed influences were minor compared to changes resulting from differences in total extracted EC mass.

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Section: Extraction Kineticssupporting

confidence: 69%