The Experts below are selected from a list of 3348 Experts worldwide ranked by ideXlab platform
Linmei Ge - One of the best experts on this subject based on the ideXlab platform.
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A nanosised Oxygen Scavenger: Preparation and antioxidant application to roasted sunflower seeds and walnuts
Food Chemistry, 2013Co-Authors: Honglei Mu, Hangjun Chen, Xiangjun Fang, Haiyan Gao, Fei Tao, Linmei GeAbstract:A novel Oxygen Scavenger using iron nanoparticle was produced and evaluated as a potential Oxygen Scavenger. Iron nanoparticle was prepared by liquid phase reduction method in microemulsion systems. The absorption capacity of different kinds of Oxygen Scavengers was measured as a function of time, and the absorption rate constant was evaluated at 25°C. The absorption kinetic analysis showed that the absorption process followed a first-order reaction. The absorption rate constant of nanosised and conventional Oxygen Scavenger were 0.45 ± 0.044 h-1 and 0.05 ± 0.006 h-1, respectively. Successful application of the nanosised Oxygen Scavenger on roasted sunflower seed and walnut demonstrated its ability to inhibit lipid oxidation in lipid-containing food. Roasted nut treated with nanosised Oxygen Scavenger possessed the lowest PV and AnV in all treatments after 120 days of storage. Therefore, it has the potential for broad application as an active packaging in a variety of Oxygen-sensitive foods. © 2012 Elsevier Ltd. All rights reserved.
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a nanosised Oxygen Scavenger preparation and antioxidant application to roasted sunflower seeds and walnuts
Food Chemistry, 2013Co-Authors: Honglei Mu, Hangjun Chen, Xiangjun Fang, Linmei GeAbstract:Abstract A novel Oxygen Scavenger using iron nanoparticle was produced and evaluated as a potential Oxygen Scavenger. Iron nanoparticle was prepared by liquid phase reduction method in microemulsion systems. The absorption capacity of different kinds of Oxygen Scavengers was measured as a function of time, and the absorption rate constant was evaluated at 25 °C. The absorption kinetic analysis showed that the absorption process followed a first-order reaction. The absorption rate constant of nanosised and conventional Oxygen Scavenger were 0.45 ± 0.044 h −1 and 0.05 ± 0.006 h −1 , respectively. Successful application of the nanosised Oxygen Scavenger on roasted sunflower seed and walnut demonstrated its ability to inhibit lipid oxidation in lipid-containing food. Roasted nut treated with nanosised Oxygen Scavenger possessed the lowest PV and AnV in all treatments after 120 days of storage. Therefore, it has the potential for broad application as an active packaging in a variety of Oxygen-sensitive foods.
Bruce E Logan - One of the best experts on this subject based on the ideXlab platform.
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electricity generation using membrane and salt bridge microbial fuel cells
Water Research, 2005Co-Authors: Shaoan Cheng, Bruce E LoganAbstract:Abstract Microbial fuel cells (MFCs) can be used to directly generate electricity from the oxidation of dissolved organic matter, but optimization of MFCs will require that we know more about the factors that can increase power output such as the type of proton exchange system which can affect the system internal resistance. Power output in a MFC containing a proton exchange membrane was compared using a pure culture ( Geobacter metallireducens ) or a mixed culture (wastewater inoculum). Power output with either inoculum was essentially the same, with 40±1 mW/m 2 for G. metallireducens and 38±1 mW/m 2 for the wastewater inoculum. We also examined power output in a MFC with a salt bridge instead of a membrane system. Power output by the salt bridge MFC (inoculated with G. metallireducens ) was 2.2 mW/m 2 . The low power output was directly attributed to the higher internal resistance of the salt bridge system ( 19920 ± 50 Ω ) compared to that of the membrane system ( 1286 ± 1 Ω ) based on measurements using impedance spectroscopy. In both systems, it was observed that Oxygen diffusion from the cathode chamber into the anode chamber was a factor in power generation. Nitrogen gas sparging, L-cysteine (a chemical Oxygen Scavenger), or suspended cells (biological Oxygen Scavenger) were used to limit the effects of gas diffusion into the anode chamber. Nitrogen gas sparging, for example, increased overall Coulombic efficiency (47% or 55%) compared to that obtained without gas sparging (19%). These results show that increasing power densities in MFCs will require reducing the internal resistance of the system, and that methods are needed to control the dissolved Oxygen flux into the anode chamber in order to increase overall Coulombic efficiency.
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Electricity generation using membrane and salt bridge microbial fuel cells
Water Research, 2005Co-Authors: Booki Min, Shaoan Cheng, Bruce E LoganAbstract:Microbial fuel cells (MFCs) can be used to directly generate electricity from the oxidation of dissolved organic matter, but optimization of MFCs will require that we know more about the factors that can increase power output such as the type of proton exchange system which can affect the system internal resistance. Power output in a MFC containing a proton exchange membrane was compared using a pure culture (Geobacter metallireducens) or a mixed culture (wastewater inoculum). Power output with either inoculum was essentially the same, with 40±1 mW/m2for G. metallireducens and 38±1 mW/m2for the wastewater inoculum. We also examined power output in a MFC with a salt bridge instead of a membrane system. Power output by the salt bridge MFC (inoculated with G. metallireducens) was 2.2 mW/m2. The low power output was directly attributed to the higher internal resistance of the salt bridge system (19920±50Ω) compared to that of the membrane system (1286±1Ω) based on measurements using impedance spectroscopy. In both systems, it was observed that Oxygen diffusion from the cathode chamber into the anode chamber was a factor in power generation. Nitrogen gas sparging, L-cysteine (a chemical Oxygen Scavenger), or suspended cells (biological Oxygen Scavenger) were used to limit the effects of gas diffusion into the anode chamber. Nitrogen gas sparging, for example, increased overall Coulombic efficiency (47% or 55%) compared to that obtained without gas sparging (19%). These results show that increasing power densities in MFCs will require reducing the internal resistance of the system, and that methods are needed to control the dissolved Oxygen flux into the anode chamber in order to increase overall Coulombic efficiency. © 2005 Elsevier Ltd. All rights reserved.
Maria Lúcia Guerra Monteiro - One of the best experts on this subject based on the ideXlab platform.
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Combined effect of Oxygen-Scavenger packaging and UV-C radiation on shelf life of refrigerated tilapia (Oreochromis niloticus) fillets
Scientific Reports, 2020Co-Authors: Maria Lúcia Guerra Monteiro, Eliane Teixeira Mársico, Yhan Da Silva Mutz, Vinicius Silva Castro, Rodrigo Vilela De Barros Pinto Moreira, Thiago Da Silveira Álvares, Carlos Adam Conte-juniorAbstract:This study investigated the physicochemical, instrumental and bacterial parameters of tilapia fillets subjected to Oxygen-Scavenger packaging, alone or in combination with UV-C radiation at two doses (0.102 and 0.301 J/cm^2), stored at 4 ± 1 °C for 23 days. The Oxygen Scavenger, both UV-C doses, and the Oxygen Scavenger combined with UV-C, independently of the dose, extended the shelf life in 5, 6 and 7 days, respectively, by decreasing the bacterial growth rate and the formation of degradation compounds (e.g., TVB-N and ammonia). Oxygen-Scavenger packaging, alone or in combination with UV-C at 0.102 J/cm^2 and 0.301 J/cm^2 showed lower amounts of free amino acids (FAA; 34.39, 34.49 and 34.50 mg L-lysine/kg fish tissue, 3.63, 3.57 and 3.61 mg L- ornithine/kg fish tissue, 27.52, 27.63 and 27.67 mg L-arginine/kg fish tissue), biogenic amines (BA; 3.81, 3.87 and 3.89 mg cadaverine/kg fish tissue, 12.88, 12.91 and 12.86 mg putrescine/kg fish tissue, 2.41, 2.44 and 2.47 mg spermidine/kg fish tissue), redness (2.53, 2.55 and 2.59), yellowness (6.65, 6.69 and 6.72), lipid oxidation (1.52, 1.53 and 1.58 mg malondialdehyde/kg fish tissue) and protein oxidation (5.06, 5.11 and 5.18 nmol carbonyls/mg protein), with higher hardness (3273.41, 2652.98 and 2687.57 g) than control (air packaging; 41.97 mg L-lysine/kg fish tissue, 4.83 mg L- ornithine/kg fish tissue, 37.33 mg L-arginine/kg fish tissue, 4.82 mg cadaverine/kg fish tissue, 16.56 mg putrescine/kg fish tissue, 3.21 mg spermidine/kg fish tissue, 4.26 of redness, 8.17 of yellowness, 2.88 mg malondialdehyde/kg fish tissue, 9.44 nmol carbonyls/mg protein and 2092.58 g of hardness), respectively, on day 13 of storage when the control fillets were unfit for consumption (7 log CFU/g) (p 0.05), higher amounts of FAA (44.28 and 44.13 mg L-lysine/kg fish tissue, 5.16 and 5.12 mg L- ornithine/kg fish tissue, 40.20 and 40.28 mg L-arginine/kg fish tissue), redness (4.86 and 5.33), yellowness (9.32 and 10.01), lipid oxidation (3.09 and 3.52 mg malondialdehyde/kg fish tissue) and protein oxidation (10.27 and 11.93 nmol carbonyls/mg protein), as well as lower hardness (1877.54 and 1767.39 g), respectively, than control fillets (p
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combined effect of Oxygen Scavenger packaging and uv c radiation on shelf life of refrigerated tilapia oreochromis niloticus fillets
Scientific Reports, 2020Co-Authors: Maria Lúcia Guerra Monteiro, Eliane Teixeira Mársico, Yhan Da Silva Mutz, Vinicius Silva Castro, Thiago Da Silveira Álvares, Rodrigo Vilela De Barros Pinto Moreira, Carlos Adam ContejuniorAbstract:This study investigated the physicochemical, instrumental and bacterial parameters of tilapia fillets subjected to Oxygen-Scavenger packaging, alone or in combination with UV-C radiation at two doses (0.102 and 0.301 J/cm2), stored at 4 ± 1 °C for 23 days. The Oxygen Scavenger, both UV-C doses, and the Oxygen Scavenger combined with UV-C, independently of the dose, extended the shelf life in 5, 6 and 7 days, respectively, by decreasing the bacterial growth rate and the formation of degradation compounds (e.g., TVB-N and ammonia). Oxygen-Scavenger packaging, alone or in combination with UV-C at 0.102 J/cm2 and 0.301 J/cm2 showed lower amounts of free amino acids (FAA; 34.39, 34.49 and 34.50 mg L-lysine/kg fish tissue, 3.63, 3.57 and 3.61 mg L- ornithine/kg fish tissue, 27.52, 27.63 and 27.67 mg L-arginine/kg fish tissue), biogenic amines (BA; 3.81, 3.87 and 3.89 mg cadaverine/kg fish tissue, 12.88, 12.91 and 12.86 mg putrescine/kg fish tissue, 2.41, 2.44 and 2.47 mg spermidine/kg fish tissue), redness (2.53, 2.55 and 2.59), yellowness (6.65, 6.69 and 6.72), lipid oxidation (1.52, 1.53 and 1.58 mg malondialdehyde/kg fish tissue) and protein oxidation (5.06, 5.11 and 5.18 nmol carbonyls/mg protein), with higher hardness (3273.41, 2652.98 and 2687.57 g) than control (air packaging; 41.97 mg L-lysine/kg fish tissue, 4.83 mg L- ornithine/kg fish tissue, 37.33 mg L-arginine/kg fish tissue, 4.82 mg cadaverine/kg fish tissue, 16.56 mg putrescine/kg fish tissue, 3.21 mg spermidine/kg fish tissue, 4.26 of redness, 8.17 of yellowness, 2.88 mg malondialdehyde/kg fish tissue, 9.44 nmol carbonyls/mg protein and 2092.58 g of hardness), respectively, on day 13 of storage when the control fillets were unfit for consumption (7 log CFU/g) (p 0.05), higher amounts of FAA (44.28 and 44.13 mg L-lysine/kg fish tissue, 5.16 and 5.12 mg L- ornithine/kg fish tissue, 40.20 and 40.28 mg L-arginine/kg fish tissue), redness (4.86 and 5.33), yellowness (9.32 and 10.01), lipid oxidation (3.09 and 3.52 mg malondialdehyde/kg fish tissue) and protein oxidation (10.27 and 11.93 nmol carbonyls/mg protein), as well as lower hardness (1877.54 and 1767.39 g), respectively, than control fillets (p < 0.05). The combined preservation methods were the most effective in extending the shelf life and prolonging the physicochemical quality of the refrigerated tilapia fillets and the O2 Scavenger proved to be a potential alternative to prevent the negative changes induced by both UV-C doses.
Honglei Mu - One of the best experts on this subject based on the ideXlab platform.
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A nanosised Oxygen Scavenger: Preparation and antioxidant application to roasted sunflower seeds and walnuts
Food Chemistry, 2013Co-Authors: Honglei Mu, Hangjun Chen, Xiangjun Fang, Haiyan Gao, Fei Tao, Linmei GeAbstract:A novel Oxygen Scavenger using iron nanoparticle was produced and evaluated as a potential Oxygen Scavenger. Iron nanoparticle was prepared by liquid phase reduction method in microemulsion systems. The absorption capacity of different kinds of Oxygen Scavengers was measured as a function of time, and the absorption rate constant was evaluated at 25°C. The absorption kinetic analysis showed that the absorption process followed a first-order reaction. The absorption rate constant of nanosised and conventional Oxygen Scavenger were 0.45 ± 0.044 h-1 and 0.05 ± 0.006 h-1, respectively. Successful application of the nanosised Oxygen Scavenger on roasted sunflower seed and walnut demonstrated its ability to inhibit lipid oxidation in lipid-containing food. Roasted nut treated with nanosised Oxygen Scavenger possessed the lowest PV and AnV in all treatments after 120 days of storage. Therefore, it has the potential for broad application as an active packaging in a variety of Oxygen-sensitive foods. © 2012 Elsevier Ltd. All rights reserved.
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a nanosised Oxygen Scavenger preparation and antioxidant application to roasted sunflower seeds and walnuts
Food Chemistry, 2013Co-Authors: Honglei Mu, Hangjun Chen, Xiangjun Fang, Linmei GeAbstract:Abstract A novel Oxygen Scavenger using iron nanoparticle was produced and evaluated as a potential Oxygen Scavenger. Iron nanoparticle was prepared by liquid phase reduction method in microemulsion systems. The absorption capacity of different kinds of Oxygen Scavengers was measured as a function of time, and the absorption rate constant was evaluated at 25 °C. The absorption kinetic analysis showed that the absorption process followed a first-order reaction. The absorption rate constant of nanosised and conventional Oxygen Scavenger were 0.45 ± 0.044 h −1 and 0.05 ± 0.006 h −1 , respectively. Successful application of the nanosised Oxygen Scavenger on roasted sunflower seed and walnut demonstrated its ability to inhibit lipid oxidation in lipid-containing food. Roasted nut treated with nanosised Oxygen Scavenger possessed the lowest PV and AnV in all treatments after 120 days of storage. Therefore, it has the potential for broad application as an active packaging in a variety of Oxygen-sensitive foods.
Achim Trebst - One of the best experts on this subject based on the ideXlab platform.
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plastoquinol as a singlet Oxygen Scavenger in photosystem ii
Biochimica et Biophysica Acta, 2008Co-Authors: Jerzy Kruk, Achim TrebstAbstract:We have found that in control Chlamydomonas reinhardtii cells, under high-light stress, the level of reduced plastoquinone considerably increases while in the presence of pyrazolate, an inhibitor of plastoquinone and tocopherol biosynthesis, the content of reduced plastoquinone quickly decreases, similarly to α-tocopherol. Photodegradation of both prenyllipids was partially reversed by diphenylamine, a singlet Oxygen Scavenger. It was concluded that under high-light stress plastoquinol, as well as α-tocopherol is degraded as a result of a scavenging reaction of singlet Oxygen generated in photosystem II. The lack of photodegradation of α-tocopherol and of the reduced plastoquinone in the absence of the inhibitor is due to a fast turnover of both prenyllipids, i.e., their degradation is compensated by fast biosynthesis. We have also found that the level of α-tocopherol quinone, an oxidation product of α-tocopherol, increases as the α-tocopherol is consumed. The same correlation was also observed for γ-tocopherol and its quinone form.
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tocopherol as singlet Oxygen Scavenger in photosystem ii
Journal of Plant Physiology, 2005Co-Authors: Jerzy Kruk, Heike Hollanderczytko, Walter Oettmeier, Achim TrebstAbstract:Summary Singlet Oxygen is formed in the photosystem II reaction center in the quench of P680 triplets, and the yield is dependent on light intensity and the reduction level of plastoquinone. Singlet Oxygen in PS II triggers the degradation of the D1 protein. We investigated the participation of tocopherol as a singlet Oxygen Scavenger in this system. For this purpose, we inhibited tocopherol biosynthesis at the level of the HPPdiOxygenase in the alga Chlamydomonas reinhardtii under conditions in which plastoquinone did not limit the photosynthesis rate. In the presence of the inhibitor and in high light for 2h, photosynthesis in vivo and photosystem II was inactivated, the D1 protein was degraded, and the tocopherol pool was depleted and fell below its turnover rate/h. The inhibited system could be fully resuscitated upon the addition of a chemical singlet Oxygen quencher (diphenylamine), and partly by synthetic cell wall permeable short chain a- and g-tocopherol derivatives. We conclude that under conditions of photoinhibition and extensive D1 protein turnover tocopherol has a protective function as a singlet Oxygen Scavenger. & 2005 Elsevier GmbH. All rights reserved.
