Periódicos
URI permanente desta comunidadehttps://thoth.dti.ufv.br/handle/123456789/3352
Navegar
8 resultados
Resultados da Pesquisa
Item Supplier Selection in a Coffee-Roasting Plant: an Analytic Hierarchy Process Approach(Associação Brasileira de Engenharia Agrícola, 2022-10-02) Pacheco, Daniel L. P. de A.; Malheiros, Fernando C.; Almeida, Luís F. M. de; Castillo, Lucio A. M.; Penteado, Ricardo B.Companies are looking for reliable partners, including suppliers, that offer high-quality services. The decision-making process involves several stakeholders with different objectives that require different types of relevant criteria to be considered. This study used the Analytic Hierarchy Process (AHP), a multiple-criteria decision analysis and decision-making method, to select a new supplier for a coffee-roasting plant. For this, the type of coffee was selected, and the relevant criteria were established: percentage of extrinsic defects, loss in precleaning, price, and taste. Four different potential suppliers were compared in relation to all criteria using the AHP. We achieved our research objective by establishing an order of priority for the criteria and suppliers. As a result, supplier B was the leading supplier with a 35.29% priority, followed by suppliers A and D. Our findings show great potential for using a formal method in the decision-making process in the agro-industry and applying the AHP method in an important problem and in relevant plant culture. Furthermore, other problems in agricultural engineering can benefit from the reasoning steps employed.Item Transmission of Leishmania in coffee plantations of Minas Gerais, Brazil(Instituto Oswaldo Cruz, Ministério da Saúde, 2001-12-06) Alexander, Bruce; Oliveria, Emerson Barbosa de; Haigh, Emily; Almeida, Lourenço Leal deTransmission of Leishmania was studied in 27 coffee plantations in the Brazilian State of Minas Gerais. Eighteen females and six males (11.6% of the people tested), aged between 7-65 gave a positive response to the Montenegro skin test. Awareness of sand flies based on the ability of respondents to identify the insects using up to seven predetermined characteristics was significantly greater among inhabitants of houses occupied by at least one Mn+ve individual. Five species of phlebotomine sand fly, including three suspected Leishmania vectors, were collected within plantations under three different cultivation systems. Four of these species i.e., Lu. fischeri (Pinto 1926), Lu. migonei (França 1920), Lu. misionensis (Castro 1959) and Lutzomyia whitmani (Antunes & Coutinho 1939) were collected in an organic plantation and the last of these was also present in the other two plantation types. The remaining species, Lu. intermedia (Lutz & Neiva 1912), was collected in plantations under both the "adensado" and "convencional" systems. The results of this study indicate that transmission of Leishmania to man in coffee-growing areas of Minas Gerais may involve phlebotomine sand flies that inhabit plantations.Item Café com quimioterapia: uma aplicação do planejamento fatorial fracionário 2|5-1(Sociedade Brasileira de Química, 2023-03-03) Silva, Kaique Carvalho da; Caldeira, Gabriel Rocha Figueira; Nogueira, Kenya Gomes; Canela, Maria Cristina; Filgueiras, Paulo Roberto; Souza, Murilo de OliveiraChemometrics is a subfield of chemistry that emerged from advances in analytical instrumentation and computing. When seeking to solve chemical problems that depend on many concomitants experimental variables, chemometrics can be employed in order to extract as much information as possible in the least possible number of experiments. In addition, it is possible to evaluate the important effects and interactions among the variables to understand the processes being monitored in each system. In this sense, this article aimed to develop a didactic experiment of caffeine extraction using an espresso machine, applying the 25-1 fractional factorial design. The variables studied were temperature (75 and 78 °C), pressure (2 and 15 bar), granulation (bean and ground), type of coffee (special and traditional) and period of the day (morning and afternoon) to obtain maximum extraction of caffeine. The coffee extracts obtained were analyzed using UV-Vis molecular absorption spectrophotometry. The developed experiment showed the potential to spread the application of chemometrics in the academic environment and to facilitate the teaching of fractional factorial design.Item Improving the quality of kombucha cascara with different varieties and fermentation time in diverse arabica coffee (Coffea arabica L) cultivars(Universidade Federal de Lavras, 2023-01-12) Rohaya, Syarifah; Multahadi; Sulaiman, IsmailOne of the innovations of cascara is the kombucha cascara which is made from the fermented coffee fruit skin, which is fermented with a kombucha starter or Symbiotic Culture of Bacteria and Yeast (SCOBY). The cascara used in this study was cascara from the Timtim, Borbor, and Ateng super coffee varieties. This study aims to determine the effect of different varieties of arabica coffee and fermentation time on the quality of kombucha cascara. This study used a factorial randomized block design method consisting of two factors. The first factor is cascara from coffee varieties consisting of three levels (Timtim, Borbor, Ateng super). The second factor is the length of fermentation, consisting of three levels (4, 8, and 12 days). Parameters analyzed were antioxidant activity, total phenol, tannin content, pH, and total microbe. The results showed that cascara from coffee varieties significantly affected antioxidant activity, and pH. Fermentation time significantly affects antioxidant activity, total phenol, tannin content, pH, and total microbial. The best treatment was obtained in the cascara treatment of the Ateng super coffee variety and the fermentation time was 12 days with the following characteristics; antioxidant activity 45.74%, total phenol 132,59 mg/L, tannin content 0.46%, pH value 2.69, and total microbes 4.99x104 CFU/ml.Item Ocorrência de Meloidogyne paranaensis em cafeeiros na região do Alto Paranaíba em Minas Gerais(Sociedade Brasileira de Fitopatologia (SBF), 2003-03-24) Castro, José M. C.; Campos, Vicente P.; Naves, Rosemeire L.Coffee (Coffea arabica) plantations showing symptoms of decline, with peeled and rough roots and fewer side rootlets were observed in the State of Minas Gerais, Brazil. Meloidogyne spp. females were obtained from the thicker roots and processed for perineal patterns and α-esterase electrophoresis analysis. Meloidogyne paranaensis was determined to be the main cause of the decline. The incidende and field symptom patterns found were similar to those observed on coffee plantations in the State of São Paulo and Paraná, where most damage caused by M. paranaensis has been reported.Item Exploring the diversity of microorganisms and potential pectinase activity isolated from wet fermentation of coffee in northeastern Peru(Sociedade Brasileira de Ciência e Tecnologia de Alimentos, 2023-01-09) Fernandez-Güimac, Samia Littly Jahavely; Perez, Jhordy; Mendoza, Jani Elisabet; Bustamante, Danilo Edson; Calderon, Martha SteffanyIn this study, the microbiota associated with coffee fermentation from two regions from northern Peru was evaluated. Bacteria and fungi were isolated from coffee farms in the Amazonas and Cajamarca regions and identified using molecular markers 16S rRNA and ITS. The potential pectinase activity was registered by the formation of a transparent halo around colonies. As a result, 29 and 09 species belonging to bacteria and fungi, respectively, were found. The bacterial genera Lysinibacillus and Stenotrophomonas and the fungal genus Aspergillus accounted for the highest number of species isolated from coffee ferments. Forty-one out of 71 isolates showed some type of pectinase enzyme activity, and they included 23 isolates from Cajamarca and 18 from Amazonas. Nevertheless, only three bacterial species registered the formation of transparent halos and showed relevant potential pectinase enzyme activity, namely, Lysinibacillus xylanilyticus, Stenotrophomonas maltophilia, and Stenotrophomonas pavanii, which were all from the Cajamarca region. These species could be further investigated by quantifying enzymes activity and performing other biochemical properties to prototype starter cultures. Accordingly, the study of indigenous microorganisms with biological potential will be essential to increase the coffee value chain and improve the incomes of farmers.Item Impact assessment of the Coffee Social Network (Rede Social do Café)(Universidade Federal de Lavras, 2022-06-09) Pereira, Sérgio Parreiras; Bezerra, Luiza Maria Capanema; Fredo, Carlos Eduardo; Vegro, Celso Luis Rodrigues; Pereira, Cibele Maria Garcia de AguiarThe aim of the present study was to assess the impacts of the Coffee Social Network (Rede Social do Café, in portuguese) among different categories of users through the proposal of a method based on multidimensional indicators. The CSN shares information about coffee and promotes collaboration and exchange of experiences in the coffee ecosystem. In an online study conducted in 2019 with 366 respondents, we observed an overall measured impact of the CSN of 29.1%, ranging from 25% to 37%, among eight categories of users: Agroindustry, Technical Assistance and Rural Extension (TARE), Commer-cialization, Communication, Education, Research, Agricultural Production, and Other. The most expressive results were found in the Quality, Evolution in Knowledge, and Adoption of Technologies indicators, at 44.4%, 39.4%, and 38.4%, respectively. Such indicators refer to an established pattern in each one of the categories of users and are aligned with the objectives of the CSN and with its most frequent themes. The results found are relevant for the man-agement of the platform, whether as informative content or in relationship with users. Finally, the model of impact assessment proved to be appropriate for the CSN and can be applied in other social networks linked to agribusiness.Item A comparison between enzyme immunoassay and HPLC for ochratoxin A detection in green, roasted and instant coffee(Instituto de Tecnologia do Paraná - Tecpar, 2007-03) Fujii, Simone; Ono, Elisabete Yurie Sataque; Ribeiro, Ricardo Marcelo Reche; Assunção, Fernanda Garcia Algarte; Takabayashi, Cássia Reika; Oliveira, Tereza Cristina Rocha Moreira de; Itano, Eiko Nakagawa; Ueno, Yoshio; Kawamura, Osamu; Hirooka, Elisa YokoAn indirect competitive enzyme-linked immunosorbent assay (ic-ELISA) for ochratoxin A (OTA) detection in green, roasted and instant coffees was developed using anti-OTA monoclonal antibody. Immunological reagents prepared were OTA-BSA (4.76 μ g/mL), anti-OTA.7 MAb (2x10 3 -fold dilution) and HRP-anti IgG (10 3 -fold dilution). The detection limit was 3.73 ng OTA/g and correlation coefficients (r) between this immunoassay and high performance liquid chromatography were 0.98 for green coffee, 0.98 for roasted and 0.86 for instant. OTA levels detected by ic- ELISA were higher than by HPLC, with ELISA/HPLC ratio of 0.66 - 1.46 (green coffee), 0.96 - 1.11 (roasted) and 0.93 - 1.82 (instant). ELISA recoveries for OTA added to coffee (5 - 70 ng/g) were 81.53 % for green coffee, 46.73 % for roasted and 64.35 % for instant, while recoveries by HPLC were 80.54 %, 45.91 % and 55.15 %, respectively. Matrices interferences were minimized by samples dilution before carrying out the ELISA assay. The results indicate that MAb-based ic-ELISA could be a simple, sensitive and specific screening tool for OTA detection, contributing to quality and safety of coffee products.