ABSTRACT The aim of this study was to evaluate the effect of gamma irradiation (1, 2 and 3 kGy) o... more ABSTRACT The aim of this study was to evaluate the effect of gamma irradiation (1, 2 and 3 kGy) on the bacteriological quality and sensory perception of refrigerated raw whole milk. Moreover, physiochemical and bacteriological parameters were monitored during 60 days of storage at 4C. All of the irradiated samples, mainly 2 and 3 kGy, exhibited a lower (P < 0.05) bacterial load than the nonirradiated samples. During storage, the mesophilic count and titratable acidity did not increase in the irradiated samples. The consumers were able to differentiate all of the irradiated samples from the control group (P < 0.05); however, positive attributes were used to describe the irradiated samples. The present study indicates that the 2 kGy irradiation dose improved the bacteriological quality of raw whole milk and likely did not negatively affect sensory characteristics by maintaining a constant mesophilic count and titratable acidity over the 60 days of refrigerated storage.Practical ApplicationsThe prevalence of foodborne diseases and huge economic losses from food industries in developing countries has markedly increased. Taking into account the dairy products, raw milk represents the main source of foodborne infections. To investigate an alternative conservation method, three gamma irradiation doses (1, 2 and 3 kGy) were applied in refrigerated raw whole milk. After, bacteriological and sensory qualities of this milk were investigated. In addition, mesophilic count and titratable acidity were analyzed during 60 days of storage under refrigeration (4 ± 1C). On 0 day, all irradiation doses decreased (P < 0.05) the bacterial load of raw whole milk compared with nonirradiated samples. Moreover, both parameters evaluated during storage period (mesophilic bacterial count and titratable acidity) were stable in samples treated with 1, 2 and 3 kGy. However, rancid odors and flavors were perceived on the samples irradiated with 3 kGy. Therefore, in our study, the 2 kGy dose was recommended for raw whole milk because of the positive effects on bacterial quality and minimal sensory changes.
X-ray spectrometry is a non-destructive and multi-elemental technique widely used for elemental a... more X-ray spectrometry is a non-destructive and multi-elemental technique widely used for elemental analysis. This technique has inherent complexities for quantitative analysis because of matrix effects. Matrix absorption is the most important factor when measurements are carried out using thick samples. Therefore, new methods have to be developed in order to evaluate matrix effects. In this work, the feasibility of using
2000 IEEE Nuclear Science Symposium. Conference Record (Cat. No.00CH37149)
This work reports the feasibility of a nondestructive synchrotron radiation X-ray transmission im... more This work reports the feasibility of a nondestructive synchrotron radiation X-ray transmission imaging technique development at Brazilian synchrotron light source. The quality control image parameters (spatial and density resolution and noise) were available and tomography preliminaries were evaluated. Microtomograms of biomedical samples are presented. The tomographic system was mounted into the XRF beamline that uses a high intensity white beam
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2003
... The connectivity is based on notions of topology, mainly on the concept of homeomorphism [5].... more ... The connectivity is based on notions of topology, mainly on the concept of homeomorphism [5]. The EulerPoincaré formula establishes that a single solid, despite of its complexity, must obey the following rule: 0.5(V−E+F)+G=1, where V, E, F and G is the number of the vertices ...
Revista Brasileira de Saúde Materno Infantil, 2002
OBJETIVOS: descrever os níveis de Fe, Cu e Zn em amostras de colostro de puérperas adultas brasil... more OBJETIVOS: descrever os níveis de Fe, Cu e Zn em amostras de colostro de puérperas adultas brasileiras de recém-nascidos a termo (RNAT) e pré-termo (RNPT) e avaliar a influência das variáveis maternas (idade materna, estado nutricional pré-gestacional, paridade, intercorrências gestacionais, renda familiar per capita e condições de saneamento) sobre os níveis desses oligoelementos, visando apontar as mulheres em risco de produzirem colostro com menores níveis destes minerais. MÉTODOS: coletaram-se 50 amostras de colostro de puérperas de RNAT e 38 de puérperas de RNPT, do Instituto Fernandes Figueira, Rio de Janeiro, RJ, Brasil. Os oligoelementos foram analisados através da técnica de Fluorescência de Raios X por Reflexão Total com radiação Síncrotron. RESULTADOS: os níveis de Fe nos grupos RNPT e RNAT foram semelhantes (p > 0,05). As concentrações de Cu foram maiores no colostro de RNPT (p < 0,05) e os níveis de Zn maiores no colostro de RNAT (p < 0,05). Houve menores nívei...
ABSTRACT The 3D microfocus x-ray tomography is one technique of nondestructive testing used in th... more ABSTRACT The 3D microfocus x-ray tomography is one technique of nondestructive testing used in the most different areas of science and technology, given its capacity to generate clean images (practically free of the unsharpness effect) and high resolution reconstructions. The unsharpness effect minimization and space resolution improvement are consequences of the focal spot size reduction in the x-ray microfocus tube to dimensions smaller than 50 micrometers . A problem normally found in the industrial area is the characterization of system parts with similar complex architectures to the bone structures. In the medicine, these structures are quantified through morphologic and topologic parameters such as: volume to volume ratio, area to volume ratio, connectivity, anisotropy and derived parameters, all obtained currently by means of the tomography system and in an automated way. In this work, the results of the complex object characterization are presented (ceramic filter) using 3D tomography system for parameter extraction.
ABSTRACT The aim of this study was to evaluate the effect of gamma irradiation (1, 2 and 3 kGy) o... more ABSTRACT The aim of this study was to evaluate the effect of gamma irradiation (1, 2 and 3 kGy) on the bacteriological quality and sensory perception of refrigerated raw whole milk. Moreover, physiochemical and bacteriological parameters were monitored during 60 days of storage at 4C. All of the irradiated samples, mainly 2 and 3 kGy, exhibited a lower (P &lt; 0.05) bacterial load than the nonirradiated samples. During storage, the mesophilic count and titratable acidity did not increase in the irradiated samples. The consumers were able to differentiate all of the irradiated samples from the control group (P &lt; 0.05); however, positive attributes were used to describe the irradiated samples. The present study indicates that the 2 kGy irradiation dose improved the bacteriological quality of raw whole milk and likely did not negatively affect sensory characteristics by maintaining a constant mesophilic count and titratable acidity over the 60 days of refrigerated storage.Practical ApplicationsThe prevalence of foodborne diseases and huge economic losses from food industries in developing countries has markedly increased. Taking into account the dairy products, raw milk represents the main source of foodborne infections. To investigate an alternative conservation method, three gamma irradiation doses (1, 2 and 3 kGy) were applied in refrigerated raw whole milk. After, bacteriological and sensory qualities of this milk were investigated. In addition, mesophilic count and titratable acidity were analyzed during 60 days of storage under refrigeration (4 ± 1C). On 0 day, all irradiation doses decreased (P &lt; 0.05) the bacterial load of raw whole milk compared with nonirradiated samples. Moreover, both parameters evaluated during storage period (mesophilic bacterial count and titratable acidity) were stable in samples treated with 1, 2 and 3 kGy. However, rancid odors and flavors were perceived on the samples irradiated with 3 kGy. Therefore, in our study, the 2 kGy dose was recommended for raw whole milk because of the positive effects on bacterial quality and minimal sensory changes.
X-ray spectrometry is a non-destructive and multi-elemental technique widely used for elemental a... more X-ray spectrometry is a non-destructive and multi-elemental technique widely used for elemental analysis. This technique has inherent complexities for quantitative analysis because of matrix effects. Matrix absorption is the most important factor when measurements are carried out using thick samples. Therefore, new methods have to be developed in order to evaluate matrix effects. In this work, the feasibility of using
In this work, synchrotron radiation total reflection X-ray fluorescence spectrometry (SRTXRF) was... more In this work, synchrotron radiation total reflection X-ray fluorescence spectrometry (SRTXRF) was used to determine trace elements in eight hypoglycemiant plants (Trigonella foenum graecum, Panax ginseng, Pfaffia paniculata, Myrcia speciosa, Zea mays, Harpagophytum procumbens, Syzygium jambolona, and Bauhinia forficate). The elements P, K, Ca, Ti, Mn, Fe, Cu, Zn, Rb, and Sr were detected in all medicinal plants investigated, whereas Si, S, Sc, V, Cr, Co, Ni, Se, Nb, Mo, Sn, Sb, Ba, Hg, and Pb were detected only in some of the samples. The concentration of elements in hypoglycemiant plants varied from 0.15 microg/g of Co to 3.0 x 10(4) microg/g of K and the mean of experimental limit of detection for these elements were 0.14 and 3.6 microg/g, respectively.
ABSTRACT The aim of this study was to evaluate the effect of gamma irradiation (1, 2 and 3 kGy) o... more ABSTRACT The aim of this study was to evaluate the effect of gamma irradiation (1, 2 and 3 kGy) on the bacteriological quality and sensory perception of refrigerated raw whole milk. Moreover, physiochemical and bacteriological parameters were monitored during 60 days of storage at 4C. All of the irradiated samples, mainly 2 and 3 kGy, exhibited a lower (P &lt; 0.05) bacterial load than the nonirradiated samples. During storage, the mesophilic count and titratable acidity did not increase in the irradiated samples. The consumers were able to differentiate all of the irradiated samples from the control group (P &lt; 0.05); however, positive attributes were used to describe the irradiated samples. The present study indicates that the 2 kGy irradiation dose improved the bacteriological quality of raw whole milk and likely did not negatively affect sensory characteristics by maintaining a constant mesophilic count and titratable acidity over the 60 days of refrigerated storage.Practical ApplicationsThe prevalence of foodborne diseases and huge economic losses from food industries in developing countries has markedly increased. Taking into account the dairy products, raw milk represents the main source of foodborne infections. To investigate an alternative conservation method, three gamma irradiation doses (1, 2 and 3 kGy) were applied in refrigerated raw whole milk. After, bacteriological and sensory qualities of this milk were investigated. In addition, mesophilic count and titratable acidity were analyzed during 60 days of storage under refrigeration (4 ± 1C). On 0 day, all irradiation doses decreased (P &lt; 0.05) the bacterial load of raw whole milk compared with nonirradiated samples. Moreover, both parameters evaluated during storage period (mesophilic bacterial count and titratable acidity) were stable in samples treated with 1, 2 and 3 kGy. However, rancid odors and flavors were perceived on the samples irradiated with 3 kGy. Therefore, in our study, the 2 kGy dose was recommended for raw whole milk because of the positive effects on bacterial quality and minimal sensory changes.
X-ray spectrometry is a non-destructive and multi-elemental technique widely used for elemental a... more X-ray spectrometry is a non-destructive and multi-elemental technique widely used for elemental analysis. This technique has inherent complexities for quantitative analysis because of matrix effects. Matrix absorption is the most important factor when measurements are carried out using thick samples. Therefore, new methods have to be developed in order to evaluate matrix effects. In this work, the feasibility of using
2000 IEEE Nuclear Science Symposium. Conference Record (Cat. No.00CH37149)
This work reports the feasibility of a nondestructive synchrotron radiation X-ray transmission im... more This work reports the feasibility of a nondestructive synchrotron radiation X-ray transmission imaging technique development at Brazilian synchrotron light source. The quality control image parameters (spatial and density resolution and noise) were available and tomography preliminaries were evaluated. Microtomograms of biomedical samples are presented. The tomographic system was mounted into the XRF beamline that uses a high intensity white beam
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2003
... The connectivity is based on notions of topology, mainly on the concept of homeomorphism [5].... more ... The connectivity is based on notions of topology, mainly on the concept of homeomorphism [5]. The EulerPoincaré formula establishes that a single solid, despite of its complexity, must obey the following rule: 0.5(V−E+F)+G=1, where V, E, F and G is the number of the vertices ...
Revista Brasileira de Saúde Materno Infantil, 2002
OBJETIVOS: descrever os níveis de Fe, Cu e Zn em amostras de colostro de puérperas adultas brasil... more OBJETIVOS: descrever os níveis de Fe, Cu e Zn em amostras de colostro de puérperas adultas brasileiras de recém-nascidos a termo (RNAT) e pré-termo (RNPT) e avaliar a influência das variáveis maternas (idade materna, estado nutricional pré-gestacional, paridade, intercorrências gestacionais, renda familiar per capita e condições de saneamento) sobre os níveis desses oligoelementos, visando apontar as mulheres em risco de produzirem colostro com menores níveis destes minerais. MÉTODOS: coletaram-se 50 amostras de colostro de puérperas de RNAT e 38 de puérperas de RNPT, do Instituto Fernandes Figueira, Rio de Janeiro, RJ, Brasil. Os oligoelementos foram analisados através da técnica de Fluorescência de Raios X por Reflexão Total com radiação Síncrotron. RESULTADOS: os níveis de Fe nos grupos RNPT e RNAT foram semelhantes (p > 0,05). As concentrações de Cu foram maiores no colostro de RNPT (p < 0,05) e os níveis de Zn maiores no colostro de RNAT (p < 0,05). Houve menores nívei...
ABSTRACT The 3D microfocus x-ray tomography is one technique of nondestructive testing used in th... more ABSTRACT The 3D microfocus x-ray tomography is one technique of nondestructive testing used in the most different areas of science and technology, given its capacity to generate clean images (practically free of the unsharpness effect) and high resolution reconstructions. The unsharpness effect minimization and space resolution improvement are consequences of the focal spot size reduction in the x-ray microfocus tube to dimensions smaller than 50 micrometers . A problem normally found in the industrial area is the characterization of system parts with similar complex architectures to the bone structures. In the medicine, these structures are quantified through morphologic and topologic parameters such as: volume to volume ratio, area to volume ratio, connectivity, anisotropy and derived parameters, all obtained currently by means of the tomography system and in an automated way. In this work, the results of the complex object characterization are presented (ceramic filter) using 3D tomography system for parameter extraction.
ABSTRACT The aim of this study was to evaluate the effect of gamma irradiation (1, 2 and 3 kGy) o... more ABSTRACT The aim of this study was to evaluate the effect of gamma irradiation (1, 2 and 3 kGy) on the bacteriological quality and sensory perception of refrigerated raw whole milk. Moreover, physiochemical and bacteriological parameters were monitored during 60 days of storage at 4C. All of the irradiated samples, mainly 2 and 3 kGy, exhibited a lower (P &lt; 0.05) bacterial load than the nonirradiated samples. During storage, the mesophilic count and titratable acidity did not increase in the irradiated samples. The consumers were able to differentiate all of the irradiated samples from the control group (P &lt; 0.05); however, positive attributes were used to describe the irradiated samples. The present study indicates that the 2 kGy irradiation dose improved the bacteriological quality of raw whole milk and likely did not negatively affect sensory characteristics by maintaining a constant mesophilic count and titratable acidity over the 60 days of refrigerated storage.Practical ApplicationsThe prevalence of foodborne diseases and huge economic losses from food industries in developing countries has markedly increased. Taking into account the dairy products, raw milk represents the main source of foodborne infections. To investigate an alternative conservation method, three gamma irradiation doses (1, 2 and 3 kGy) were applied in refrigerated raw whole milk. After, bacteriological and sensory qualities of this milk were investigated. In addition, mesophilic count and titratable acidity were analyzed during 60 days of storage under refrigeration (4 ± 1C). On 0 day, all irradiation doses decreased (P &lt; 0.05) the bacterial load of raw whole milk compared with nonirradiated samples. Moreover, both parameters evaluated during storage period (mesophilic bacterial count and titratable acidity) were stable in samples treated with 1, 2 and 3 kGy. However, rancid odors and flavors were perceived on the samples irradiated with 3 kGy. Therefore, in our study, the 2 kGy dose was recommended for raw whole milk because of the positive effects on bacterial quality and minimal sensory changes.
X-ray spectrometry is a non-destructive and multi-elemental technique widely used for elemental a... more X-ray spectrometry is a non-destructive and multi-elemental technique widely used for elemental analysis. This technique has inherent complexities for quantitative analysis because of matrix effects. Matrix absorption is the most important factor when measurements are carried out using thick samples. Therefore, new methods have to be developed in order to evaluate matrix effects. In this work, the feasibility of using
In this work, synchrotron radiation total reflection X-ray fluorescence spectrometry (SRTXRF) was... more In this work, synchrotron radiation total reflection X-ray fluorescence spectrometry (SRTXRF) was used to determine trace elements in eight hypoglycemiant plants (Trigonella foenum graecum, Panax ginseng, Pfaffia paniculata, Myrcia speciosa, Zea mays, Harpagophytum procumbens, Syzygium jambolona, and Bauhinia forficate). The elements P, K, Ca, Ti, Mn, Fe, Cu, Zn, Rb, and Sr were detected in all medicinal plants investigated, whereas Si, S, Sc, V, Cr, Co, Ni, Se, Nb, Mo, Sn, Sb, Ba, Hg, and Pb were detected only in some of the samples. The concentration of elements in hypoglycemiant plants varied from 0.15 microg/g of Co to 3.0 x 10(4) microg/g of K and the mean of experimental limit of detection for these elements were 0.14 and 3.6 microg/g, respectively.
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