The Experts below are selected from a list of 21855 Experts worldwide ranked by ideXlab platform
Miriam Dupas Hubinger - One of the best experts on this subject based on the ideXlab platform.
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effect of process conditions on the microencapsulation of coffee oil by spray drying
Food and Bioproducts Processing, 2012Co-Authors: Elen Cristina Frascareli, Renata V. Tonon, Vanessa Silva, Miriam Dupas HubingerAbstract:Abstract Microencapsulation is a good alternative to transform liquid food flavourings, such as coffee oil, into stable and free-flowing powders. Thus the aim of this study was to evaluate the influence of process conditions on the microencapsulation of coffee oil by spray drying, using gum Arabic as encapsulating agent. The effect of total solid content (10–30%), oil concentration with respect to total solids (10–30%) and Inlet Air Temperature (150–190 °C) on the encapsulation efficiency, oil retention, moisture content and powder hygroscopicity were evaluated by a complete 2 3 central composite rotatable design. Both encapsulation efficiency and oil retention were negatively influenced by oil concentration and Inlet Air Temperature, and positively affected by total solid content, which could be related to the emulsion viscosity and droplet size. Particles produced at the optimized process conditions (30% of total solids, 15% of oil with respect to total solids and Inlet Air Temperature of 170 °C) were evaluated for oxidative stability and showed to be stable during storage at 25 °C, but not at 60 °C. At this Temperature, pure oil presented higher lipid oxidation than encapsulated, confirming the protective effect of microencapsulation on the oxidative stability of this product.
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spray drying of acai euterpe oleraceae mart juice effect of Inlet Air Temperature and type of carrier agent
Journal of Food Processing and Preservation, 2011Co-Authors: Renata V. Tonon, Samuel Scarassatti Freitas, Miriam Dupas HubingerAbstract:Physical and morphological characteristics of powdered acai juice were evaluated in this work. Powders produced by spray drying at different Temperatures (140, 170 and 200C) using different carrier agents (maltodextrin 10DE, maltodextrin 20DE and gum Arabic) were evaluated for moisture content, water activity, hygroscopicity, bulk density, particle size distribution and morphology. Sorption isotherms were also constructed. The samples produced with maltodextrin 10DE showed the highest moisture content, water activity and mean diameter and were the less hygroscopic. The increase in drying Temperature resulted in particles with lower moisture content, water activity and bulk density. Moreover, powders produced at higher Temperatures were more hygroscopic and exhibited a greater number of particles with smooth surface. Sorption isotherms were of type III and showed a better fit to Guggenheim-Anderson-de Boe and Brunauer-Emmett-Teller models. PRACTICAL APPLICATIONS The present study provides useful information about the production of powdered acai juice by spray drying. In this process, the addition of a carrier agent is normally necessary in order to avoid problems like stickiness on the dryer wall, which would be negative to process yield and product quality. Moreover, among the process variables related to spray drying, the Inlet Air Temperature can be considered very important, since it is directly related with powder quality, as well as with energy saving/wasting. Thus, in this work, the effect of three different types of carrier agents and three Inlet Air Temperatures on the physicochemical properties of spray-dried acai juice was evaluated. The results can be useful for food and cosmetic companies looking for novel and inexpensive sources of natural pigments, to be used as colorants and flavorings.
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spray drying of chicken meat protein hydrolysate influence of process conditions on powder property and dryer performance
Drying Technology, 2011Co-Authors: Louise Emy Kurozawa, Kil Jin Park, Miriam Dupas HubingerAbstract:The influence of operational conditions of a spray dryer on powder properties and equipment performance during spray drying of chicken meat hydrolysate was evaluated by a central composite rotatable design. The independent variables were Inlet Air Temperature (120 to 200°C) and feed flow (0.1 to 0.38 kg/h). Spray dryer performance was assessed through estimation of product recovery, outlet Air Temperature, thermal efficiency, and energy on the dryer, obtained by mass and heat balance in the dryer system. Powder property was characterized in respect to antioxidant activity. The stable free radical diphenylpicrylhydrazyl (DPPH) was used to estimate the antioxidant activity of protein hydrolysate powder. This response varied from 38.7 to 59.4% and was only affected by Inlet Air Temperature. Moreover, the results demonstrate a significant effect of the processing conditions on dryer performance. The increase of feed flow results in higher thermal efficiency and lower energy on dryer. Higher product recovery v...
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influence of emulsion composition and Inlet Air Temperature on the microencapsulation of flaxseed oil by spray drying
Food Research International, 2011Co-Authors: Renata V. Tonon, Carlos Raimundo Ferreira Grosso, Miriam Dupas HubingerAbstract:Abstract The objective of this work was to study the influence of some process conditions on the microencapsulation of flaxseed oil by spray drying. The process was carried out on a mini spray dryer and gum Arabic was used as wall material. Seventeen tests were made, according to a central composite design. Independent variables were: Inlet Air Temperature (138–202 °C), total solid content (10–30% w/w) and oil concentration with respect to total solids (10–30% w/w). Encapsulation efficiency, lipid oxidation and powder bulk density were analyzed as responses. Powder morphology and particle size distribution were also analyzed. The feed emulsions were characterized with respect to droplet size and viscosity. Higher solid content and lower oil concentration led to higher encapsulation efficiency and lower lipid oxidation, which was related to the higher emulsion viscosity and lower droplets size. Increasing drying Temperature resulted in higher lipid oxidation. Bulk density increased when higher solid content and lower Inlet Air Temperature were used. The particles were rounded and shriveled, and their mean diameter was mainly affected by total solid content.
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influence of process conditions on the physicochemical properties of acai euterpe oleraceae mart powder produced by spray drying
Journal of Food Engineering, 2008Co-Authors: Renata V. Tonon, Catherine Brabet, Miriam Dupas HubingerAbstract:Abstract The objective of this work was to study the influence of spray drying conditions on the physicochemical properties of acai powder. The process was carried out on a mini spray dryer and maltodextrin 10DE was used as carrier agent. Seventeen tests were made, according to a central composite design. Independent variables were: Inlet Air Temperature (138–202 °C), feed flow rate (5–25 g/min) and maltodextrin concentration (10–30%). Moisture content, hygroscopicity, process yield and anthocyanin retention were analysed as responses. Powder moisture content and process yield were positively affected by Inlet Air Temperature and negatively affected by feed flow rate, which are directly related to heat and mass transfer. Process yield was also negatively influenced by maltodextrin concentration, due to the increase on mixture viscosity. Powders hygroscopicity decreased with increasing maltodextrin concentration, decreasing Temperature and increasing feed flow rate. Powders with lower moisture content were more hygroscopic, which is related to the greater water concentration gradient between the product and the surrounding Air. Anthocyanin retention was only affected by Temperature, due to its high sensitivity. In respect to morphology, the particles produced at higher Temperature were larger and a great number of them showed smooth surface.
A.p. Sathiyagnanam - One of the best experts on this subject based on the ideXlab platform.
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Analysis the optimum Inlet Air Temperature for controlling homogeneous charge compression ignition (HCCI) engine
Alexandria Engineering Journal, 2017Co-Authors: Suvarnalatha Gowthaman, A.p. SathiyagnanamAbstract:Homogeneous charge compression ignition engine is promising replacement for conventional CI diesel engine with lower oxides of nitrogen (NOx) and smoke emissions and improves the thermal efficiency with consume less amount of fuel. In general, HCCI engine operates with lean Air/fuel charge for all operating condition, and it makes the HCCI combustion more complex and difficult to control the start of ignition point. The Inlet Air Temperature is the primary parameter for controlling the HCCI combustion. In this study, the HCCI engine was operated at different Inlet Air Temperatures as 90°C, 100°C, 110°C, 120°C, 130°C, 140°C and 150°C respectively. From this study, it was observed that the level of NOxemission increased with increasing the Inlet Air Temperature and smoke emission was reduced with increasing the Inlet charge Temperature. The Inlet Air Temperature about 120°C showed maximum reduction of smoke emission about 15HSU at 60% load. Similarly, CO and HC were reduced with increasing the Inlet Air Temperature. The specific fuel consumption of HCCI mode engine decreased with increasing the Inlet Air Temperature and the power output of the engine increased with increasing the suction Air Temperature.
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Effects of
Elsevier, 2016Co-Authors: Suvarnalatha Gowthaman, A.p. SathiyagnanamAbstract:This work investigates the effect of both Inlet Air Temperature and fuel injection pressure on performance and emission behaviour of homogeneous charge compression ignition engine (HCCI) fuelled with diesel fuel. In this investigation, HCCI engine operates with different Inlet Air Temperature and fuel injection pressure, and analysis the effect of these variables on HCCI engine performance and emissions. The Inlet Air Temperatures are varied between 40 °C and 70 °C and the injection pressure in the port fuel injector is varied from 3 bar to 5 bar respectively. From the results, the optimum Inlet Air Temperature and fuel injection pressure for efficient HCCI engine operation are identified. The result shows that, brake thermal efficiency of HCCI is nearer to the value of conventional diesel engine, and can be obtained if HCCI engine operates with 5 bar injection pressure and 60 °C Air Temperature and a simultaneous reduction in oxides of nitrogen (NOx) and smoke emissions compared to conventional diesel engine. However, when Inlet Air is heated for improvement of vaporisation of diesel fuel, the higher Inlet Air Temperature limits the operation range of HCCI engine, due to high knocking intensity, high NOx emissions and misfire of charge. The fuel injection pressure is also limited due to high level of HC and NOx emissions
Renata V. Tonon - One of the best experts on this subject based on the ideXlab platform.
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effect of process conditions on the microencapsulation of coffee oil by spray drying
Food and Bioproducts Processing, 2012Co-Authors: Elen Cristina Frascareli, Renata V. Tonon, Vanessa Silva, Miriam Dupas HubingerAbstract:Abstract Microencapsulation is a good alternative to transform liquid food flavourings, such as coffee oil, into stable and free-flowing powders. Thus the aim of this study was to evaluate the influence of process conditions on the microencapsulation of coffee oil by spray drying, using gum Arabic as encapsulating agent. The effect of total solid content (10–30%), oil concentration with respect to total solids (10–30%) and Inlet Air Temperature (150–190 °C) on the encapsulation efficiency, oil retention, moisture content and powder hygroscopicity were evaluated by a complete 2 3 central composite rotatable design. Both encapsulation efficiency and oil retention were negatively influenced by oil concentration and Inlet Air Temperature, and positively affected by total solid content, which could be related to the emulsion viscosity and droplet size. Particles produced at the optimized process conditions (30% of total solids, 15% of oil with respect to total solids and Inlet Air Temperature of 170 °C) were evaluated for oxidative stability and showed to be stable during storage at 25 °C, but not at 60 °C. At this Temperature, pure oil presented higher lipid oxidation than encapsulated, confirming the protective effect of microencapsulation on the oxidative stability of this product.
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spray drying of acai euterpe oleraceae mart juice effect of Inlet Air Temperature and type of carrier agent
Journal of Food Processing and Preservation, 2011Co-Authors: Renata V. Tonon, Samuel Scarassatti Freitas, Miriam Dupas HubingerAbstract:Physical and morphological characteristics of powdered acai juice were evaluated in this work. Powders produced by spray drying at different Temperatures (140, 170 and 200C) using different carrier agents (maltodextrin 10DE, maltodextrin 20DE and gum Arabic) were evaluated for moisture content, water activity, hygroscopicity, bulk density, particle size distribution and morphology. Sorption isotherms were also constructed. The samples produced with maltodextrin 10DE showed the highest moisture content, water activity and mean diameter and were the less hygroscopic. The increase in drying Temperature resulted in particles with lower moisture content, water activity and bulk density. Moreover, powders produced at higher Temperatures were more hygroscopic and exhibited a greater number of particles with smooth surface. Sorption isotherms were of type III and showed a better fit to Guggenheim-Anderson-de Boe and Brunauer-Emmett-Teller models. PRACTICAL APPLICATIONS The present study provides useful information about the production of powdered acai juice by spray drying. In this process, the addition of a carrier agent is normally necessary in order to avoid problems like stickiness on the dryer wall, which would be negative to process yield and product quality. Moreover, among the process variables related to spray drying, the Inlet Air Temperature can be considered very important, since it is directly related with powder quality, as well as with energy saving/wasting. Thus, in this work, the effect of three different types of carrier agents and three Inlet Air Temperatures on the physicochemical properties of spray-dried acai juice was evaluated. The results can be useful for food and cosmetic companies looking for novel and inexpensive sources of natural pigments, to be used as colorants and flavorings.
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influence of emulsion composition and Inlet Air Temperature on the microencapsulation of flaxseed oil by spray drying
Food Research International, 2011Co-Authors: Renata V. Tonon, Carlos Raimundo Ferreira Grosso, Miriam Dupas HubingerAbstract:Abstract The objective of this work was to study the influence of some process conditions on the microencapsulation of flaxseed oil by spray drying. The process was carried out on a mini spray dryer and gum Arabic was used as wall material. Seventeen tests were made, according to a central composite design. Independent variables were: Inlet Air Temperature (138–202 °C), total solid content (10–30% w/w) and oil concentration with respect to total solids (10–30% w/w). Encapsulation efficiency, lipid oxidation and powder bulk density were analyzed as responses. Powder morphology and particle size distribution were also analyzed. The feed emulsions were characterized with respect to droplet size and viscosity. Higher solid content and lower oil concentration led to higher encapsulation efficiency and lower lipid oxidation, which was related to the higher emulsion viscosity and lower droplets size. Increasing drying Temperature resulted in higher lipid oxidation. Bulk density increased when higher solid content and lower Inlet Air Temperature were used. The particles were rounded and shriveled, and their mean diameter was mainly affected by total solid content.
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influence of process conditions on the physicochemical properties of acai euterpe oleraceae mart powder produced by spray drying
Journal of Food Engineering, 2008Co-Authors: Renata V. Tonon, Catherine Brabet, Miriam Dupas HubingerAbstract:Abstract The objective of this work was to study the influence of spray drying conditions on the physicochemical properties of acai powder. The process was carried out on a mini spray dryer and maltodextrin 10DE was used as carrier agent. Seventeen tests were made, according to a central composite design. Independent variables were: Inlet Air Temperature (138–202 °C), feed flow rate (5–25 g/min) and maltodextrin concentration (10–30%). Moisture content, hygroscopicity, process yield and anthocyanin retention were analysed as responses. Powder moisture content and process yield were positively affected by Inlet Air Temperature and negatively affected by feed flow rate, which are directly related to heat and mass transfer. Process yield was also negatively influenced by maltodextrin concentration, due to the increase on mixture viscosity. Powders hygroscopicity decreased with increasing maltodextrin concentration, decreasing Temperature and increasing feed flow rate. Powders with lower moisture content were more hygroscopic, which is related to the greater water concentration gradient between the product and the surrounding Air. Anthocyanin retention was only affected by Temperature, due to its high sensitivity. In respect to morphology, the particles produced at higher Temperature were larger and a great number of them showed smooth surface.
Bilal Aydogan - One of the best experts on this subject based on the ideXlab platform.
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experimental investigation of tetrahydrofuran combustion in homogeneous charge compression ignition hcci engine effects of excess Air coefficient engine speed and Inlet Air Temperature
Journal of The Energy Institute, 2020Co-Authors: Bilal AydoganAbstract:Abstract In this study, the effects of tetrahydrofuran (THF) which is nontoxic and generated from renewable environmentally friendly lignocelluloses, and n-heptane/THF blends on combustion, performance and emission characteristics were investigated at various lambda, engine speed and Inlet Air Temperatures. Wide ranges of lambda value and engine speed were investigated and the results were presented in comparison to n-heptane as reference fuel. The combustion parameters such as cylinder pressure, heat release rate, in-cylinder gas Temperature, CA10, CA50, thermal efficiency, ringing intensity, maximum pressure rise rate and imep, the performance parameters such as brake torque, power output, specific fuel consumption and HC and CO emissions were determined. Operating range of the HCCI engine was also determined. The results showed that, increasing the lambda value decreased both the in-cylinder pressure and the heat release rate for all test fuels. The addition of tetrahydrofuran led to retard combustion phasing. Thermal efficiency increased about 54% for F60N40 compared to n-heptane at 60 °C Inlet Air Temperature, 1200 rpm engine speed and λ = 2.2. The results also showed that HC and CO emissions increased with the increase of tetrahydrofuran. Furthermore, tetrahydrofuran caused to expand HCCI operating range towards to knocking and misfiring boundaries.
Suvarnalatha Gowthaman - One of the best experts on this subject based on the ideXlab platform.
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Analysis the optimum Inlet Air Temperature for controlling homogeneous charge compression ignition (HCCI) engine
Alexandria Engineering Journal, 2017Co-Authors: Suvarnalatha Gowthaman, A.p. SathiyagnanamAbstract:Homogeneous charge compression ignition engine is promising replacement for conventional CI diesel engine with lower oxides of nitrogen (NOx) and smoke emissions and improves the thermal efficiency with consume less amount of fuel. In general, HCCI engine operates with lean Air/fuel charge for all operating condition, and it makes the HCCI combustion more complex and difficult to control the start of ignition point. The Inlet Air Temperature is the primary parameter for controlling the HCCI combustion. In this study, the HCCI engine was operated at different Inlet Air Temperatures as 90°C, 100°C, 110°C, 120°C, 130°C, 140°C and 150°C respectively. From this study, it was observed that the level of NOxemission increased with increasing the Inlet Air Temperature and smoke emission was reduced with increasing the Inlet charge Temperature. The Inlet Air Temperature about 120°C showed maximum reduction of smoke emission about 15HSU at 60% load. Similarly, CO and HC were reduced with increasing the Inlet Air Temperature. The specific fuel consumption of HCCI mode engine decreased with increasing the Inlet Air Temperature and the power output of the engine increased with increasing the suction Air Temperature.
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Effects of
Elsevier, 2016Co-Authors: Suvarnalatha Gowthaman, A.p. SathiyagnanamAbstract:This work investigates the effect of both Inlet Air Temperature and fuel injection pressure on performance and emission behaviour of homogeneous charge compression ignition engine (HCCI) fuelled with diesel fuel. In this investigation, HCCI engine operates with different Inlet Air Temperature and fuel injection pressure, and analysis the effect of these variables on HCCI engine performance and emissions. The Inlet Air Temperatures are varied between 40 °C and 70 °C and the injection pressure in the port fuel injector is varied from 3 bar to 5 bar respectively. From the results, the optimum Inlet Air Temperature and fuel injection pressure for efficient HCCI engine operation are identified. The result shows that, brake thermal efficiency of HCCI is nearer to the value of conventional diesel engine, and can be obtained if HCCI engine operates with 5 bar injection pressure and 60 °C Air Temperature and a simultaneous reduction in oxides of nitrogen (NOx) and smoke emissions compared to conventional diesel engine. However, when Inlet Air is heated for improvement of vaporisation of diesel fuel, the higher Inlet Air Temperature limits the operation range of HCCI engine, due to high knocking intensity, high NOx emissions and misfire of charge. The fuel injection pressure is also limited due to high level of HC and NOx emissions