Coffee Science
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Item Sensory evaluation and color of Coffea arabica coffee from the Central Mexican Highlands(Editora UFLA, 2024-11-12) Flores, Omar Roberto Vargas; Arriaga, Martín Rubí; Berasain, María Dolores Mariezcurrena; Elías, Guillermo Asdrúb al Vargas; Dávila, José Francisco RamírezCoffee is cultivate d worldwide at an average altitude of 1,500 m worldwide, but in Mexico is typically cultivated around 1,200 m. However, in Temas caltepec, Mexico State, coffee is grownat 2,100 m, resulting in a slower development process that yields a “differentiated quality.” This quality has been nationally recognized atthe “Cup of Excellence” competition, where coffees scoring above ninety points out of a hundred have received the “presidential award.” Thisrecognition has enabled these coffees to be sold as “specialty” coffeeat auction to Europe and Asia, fetching higher prices per pound and thus improving economic returns. In this study, wescientifically validate these claims by evaluating sensory quality in the cup and color ofthe bean. , for which two toasting sta rt temperatures were used. The color in roasted coffee is derived from caramelization due to the high temperatures to which it is subject ed during this process. This characteristic has an intrinsic influence for the taster even though it is not objectively measured during the cupping process. For this reason, it was decided to carry out the measurement in this research. In 2022, Arabica coffee beans of the Caturra variety were harvested from Temascaltepec using a natural process. The coffee was roasted according to the Specialty Coffee Association (SCA) protocol at five time intervals (8, 9, 10, 11, and 12 min) starting fromtwo initial roasting temperatures (210 and 215 °C). The roasted coffee was evaluated using thesensory analysis protocol of the SCA, which assessed fragrance/aroma; flavor, aftertaste, acidity, body, and balance; sweetness, uniformity, and cleanliness. In addition, we quantified the color of the coffee bean using a colorimeter. Sensory evaluation indicated that the best treatment was 215 °C/10min, with a predominant vanilla aroma (balsamic-sweet aromatic family) and an L* value of 13, suggesting a medium roast that may retain its functional properties. All treatments yielded values within proposed standards for a medium roast.Item Tasters’ performance in a coffee quality contest in Brazil(Editora UFLA, 2021) Pinheiro, Aracy Camilla Tardin; Fabri Júnior, Marcos Antônio; Cruz, Cosme Damião; Rufino, José Luis dos Santos; Sakiyama, Ney SussumuThe objective of this work was to evaluate the performance of coffee tasters in five annual editions of Minas Gerais Coffee Quality Contest. The repeat ability coefficients of the tasters’ scores for sensory attributes were estimated, as well as the minimum numbers of tasters required for consistent sensory results, and the groups of tasters by (dis)similarity of sensory scores. For the repeatability analysis, the treatments (coffees) were tested with the repeti tions, constituted by the tasters. The repeatability coefficients were estimated using the analysis of variance, principal component and structural analysis methods. The minimum number of tasters was obtained based on pre-established determination coefficients. Euclidean distance matrices between tasters were determined, which were used as a measure of dissimilarity for cluster analysis by the Tocher optimization method. The tasters’ performance in five annual editions of Minas Gerais Coffee Quality Contest is reliable using COE or SCA sensory analysis protocols. Although not fully calibrated, most tasters are grouped with similar cupping results. Unless efficient calibration prior to the contest is adopted, the number of tasters to be used in the next contest editions can not be drastically and randomly reduced, since the estimated minimum number varied over the years. Calibration activities are sug gested to improve two main aspects of the Minas Gerais Coffee Quality Contest: distinguishing the best coffees and trainning tasters.Item Sensory analysis and mid-infrared spectroscopy for discriminating roasted specialty coffees(Editora UFLA, 2021) Debona, Danieli Grancieri; Oliveira, Emanuele Catarina da Silva; Caten, Carla Schwengber ten; Guarçoni, Rogério Carvalho; Moreira, Taís Rizzo; Pereira, Lucas Louzada; Moreli, Aldemar PoloniniIn general, the process of roasting coffee uses a rotated fix drum or fluidized bed. Theoretically, the fluidized bed can provide more homogenous roastings throughout the process. Thus, in this study, we analyzed the sensorial and chemical attributes for two different coffees submitted to three roasting profiles using fluidized bed roaster. The coffees were roasted for a high temperature for a short time (HTST), medium temperature for a medium time (MTMT), and low temperature for a long time (LTLT). Sensory analysis was performed on the roasted coffees according to the SCA methodology and chemical analy sis through mid-infrared spectroscopy. The results of sensory analysis indicated a preference for MTMT roasting for coffee grown at high altitude and HTST roasting for coffee grown at low altitude. Chemically, coffees show that LTLT and MTMT roasts are most distant from each other in their chemical com position when roasting low altitude coffee, whereas the HTST and MTMT roasts are the most distant from each other when roasting high altitude coffee.