Programa de Pós-Graduação em Ciência e Tecnologia de Alimentos - PPGCTA/ITEC
URI Permanente desta comunidadehttps://repositorio.ufpa.br/handle/2011/8900
O Programa de Pós-Graduação em Ciência e Tecnologia de Alimentos (PPGCTA) integra o Instituto de Tecnologia (ITEC) da Universidade Federal do Pará (UFPA) e iniciou suas atividades em 2004 com o curso de Mestrado Acadêmico em Ciência e Tecnologia de Alimentos. Em 2010, a CAPES aprovou o Doutorado, que teve início em 2011.
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Item Acesso aberto (Open Access) Definição de condições ótimas para o processo de secagem em spray dryer da polpa de buriti (Mauritia flexuosa L.)(Universidade Federal do Pará, 2022-02-09) CRUZ, Tatyane Myllena Souza da; MEDEIROS, Heloisa Helena Berredo Reis de; http://lattes.cnpq.br/9067574515452039; https://orcid.org/0000-0002-5234-840X; PENA, Rosinelson da Silva; http://lattes.cnpq.br/3452623210043423Buriti (Mauritia flexuosa) is a native fruit of the Amazon, known for its functional potential, attributed to a high concentration of carotenoids. The spray drying process, in turn, can transform solution, suspensions or pastes into small droplets, which in contact with hot air produce powders with characteristics that favor the preservation of the product, in addition to facilitating storage and the transport. Thus, the objective of this work was to optimize the drying process of buriti pulp, in spray dryer, aiming to obtain a powdered product with desirable characteristics. For this, a central composite rotatable design (CCRD) was used to determine the influence of the variables: drying air temperature (130 – 190 °C), feed flow (7 – 17 mL/min) and carrier agent concentration (20 – 60%), on the product properties: moisture, water activity (aw), hygroscopicity, total carotenoid content, water solubility index (WSI) and the instrumental color parameter b* (fruit characteristic color parameter). To ensure the stability of the emulsion in the suspension, soy lecithin was added to all formulations, in the amount of 5% in relation to the dry matter of the sample. The response surface methodology (RSM) and the desirability function defined as optimal conditions for the drying process of buriti pulp: a gum arabic concentration of 60%, feed flow rate of 17 mL/min and drying air temperature of 190 °C; in the experimental domain. Under these conditions, the powder obtained had the following characteristics: 0.62 g/100 g moisture, aw of 0.16, hygroscopicity of 18.79 g/100 g, carotenoid content of 60.92 µg/g, ISA of 80.26% and a value of 31.32 for the chromaticity parameter b*.Item Acesso aberto (Open Access) Farinha de mandioca (Manihot esculenta) e tucupi: uma abordagem analítica utilizando espectroscopia no unfravermelho próximo (NIRS) e ferramentas quimiométricas(Universidade Federal do Pará, 2022-04-25) POMPEU, Darly Rodrigues; SOUZA, Jesus Nazareno Silva de; http://lattes.cnpq.br/3640438725903079; PENA, Rosinelson da Silva; http://lattes.cnpq.br/3452623210043423The near infrared spectroscopy (NIRS) coupled to chemometrics has been used as an alternative tool for quick and reliable solutions. Cassava flour (CF) can be classified as fermented and non-fermented types. Tucupi is a yellow broth, acidic, mostly aromatic and widely used in Regional dishes in Para state. This thesis proposed to apply for the first time the NIRS associated with chemometrics to predict quality parameters from CF and tucupi, as well as to discriminate fermented and non-fermented CF. One hundred six samples of CF was investigated and nine physicochemical parameters of CF were evaluated. Calibration equations with independent validation were developed to predict all parameters using the partial least square regression method. The performance of models was evaluated by the root mean standard error of calibration (RMSEC) and validation (RMSEV), and R2 values. The aW (RMSEC = RMSEV = 0.05), moisture content (RMSEC = 0.35%; RMSEV = 0.45%) and pH (RMSEC = 0.16; RMSEV = 0.18) could be predicted (R2 > 0.727) by NIRS coupled to multivariate analysis. NIRS coupled to Principal Component Analysis–Linear Discriminant Analysis (PCA-LDA) was also used to investigate the classification of fermented and unfermented CF. The use of NIRS spectra allows to obtain better performance parameters (training accuracy: 86.3–93.8%; validation accuracy: 84.6–96.2%) to discriminate fermented and unfermented CF than the use of the physicochemical properties (training accuracy: 80%; validation accuracy: 84.6%). NIRS was also used to predict nine quality physicochemical properties of tucupi Sixty-five samples of tucupi were used in this study. The performance of models was evaluated by the R2, RMSEC, root mean standard error of cross-validation (RMSECV) and RMSEV values. The total soluble solids contents could be predicted (R2 > 0.727; RMSEC = 0.184%; RMSECV = 0.411%; RMSEV = 0.338%) by NIRS coupled to multivariate analysis. NIRS and chemometrics proved to be a powerful tool to predict quality parameters in CF and tucupi as well as to discriminate fermented and non-fermented CF.Item Acesso aberto (Open Access) Reação em cadeia da polimerase multiplex (mPCR) para detecção de fraude e identificação de salmonella spp. em amostras de carne bovina e bubalina(Universidade Federal do Pará, 2019-09-20) DANTAS, Vanderson Vasconcelos; LOURENÇO, Lúcia de Fátima Henriques; http://lattes.cnpq.br/7365554949786769The authenticity of food has become a major issue today, for economic reasons, lifestyle, health and religious beliefs, as well as a requirement of food regulators. Proper labeling of a meat product according to its identity and quality standard is essential to ensure the food safety of consumers. However, the identification of meat and meat constituents is still a challenge for the authorities, as it is not always possible to authenticate the species of origin using commonly used methods, especially in cases where adulteration by the addition of material occurs. from a species other than those indicated on the label. The aim of this study was to optimize and develop different Multiplex Polymerase Chain Reaction (mPCR) protocols for simultaneous identification of bovine and buffalo species and for identification of Salmonella spp. in commercially available meat cuts. Two methods of DNA extraction were applied (commercial kit and from the use of organic solvents) and the quality / quantity of the obtained material was determined by agarose gel electrophoresis and spectrophotometry. Primers that amplify sequences of 429 base pairs for Salmonella spp. DNA, 346 base pairs for bovine DNA and 220 base pairs for buffalo DNA were used to perform the proposed mPCR. dilution of the extracted template DNA. For the verification of specificity, DNAs from different animal species and microorganisms were used. After standardization of the technique, bovine and buffalo meat samples were artificially contaminated with standard Salmonella tiphymurium strain (ATCC 14028), so that the detection limit of the technique was determined and, finally, commercial samples of meat cuts commercialized in northern Brazil. Brazil were analyzed by this technique to verify the hypothesis of fraud and the presence of Salmonella spp. in products marketed in the target region of the study. The results showed that the proposed mPCR presented adequate sensitivity and specificity, being able to detect Salmonella spp. from 106 cfu/mL after 12h enrichment. In addition, it was observed that approximately 20% of the samples marketed as bovine origin were of bubaline origin, and of this total, 31% had Salmonella spp. It was concluded that The developed mPCRs are efficient to detect fraud in meat cuts and Salmonella spp. It may be an alternative to be used in the routine inspection of these products.