ABSTRACT a b s t r a c t Copper nanoparticles (CuNPs) were synthesized using different types of c... more ABSTRACT a b s t r a c t Copper nanoparticles (CuNPs) were synthesized using different types of copper salts (copper acetate, copper chloride, and copper sulfate) and reducing agents (NaOH and ascorbic acid). The resulting solutions exhibited the maximum absorption peaks between 250–350 nm, which was caused by the change in the surface Plasmon resonance of CuNPs and clearly indicated the formation of CuNPs. The results of FE-SEM exhibited that the CuNPs of various shapes and size, depended upon the type of copper salts and reducing agents used. The FTIR results demonstrated the involvement of bioactive functional groups as reducing and capping agents. XRD spectra confirmed the crystalline nature of CuNPs. Furthermore, all the CuNPs exhibited strong antimicrobial activity against both, Gram-positive (Listeria monocytogenes) and Gram-negative (Escherichia coli) food-borne pathogens. & 2014 Elsevier B.V. All rights reserved.
The moisture sorption isotherms of vacuum-dried edible green alga (Capsosiphon fulvescens) powder... more The moisture sorption isotherms of vacuum-dried edible green alga (Capsosiphon fulvescens) powders were determined at 25, 35, and 45°C and water activity (a w) in the range of 0.11~0.94. An inversion effect of temperature was found at high water activity (>0.75). Various mathematical models were fitted to the experimental data, and Brunauer, Emmett, and Teller model was found to be the most suitable model describing the relationship between equilibrium moisture content and water activity (<0.45). Henderson model could also provide excellent agreement between the experimental and predicted values despite of the intersection point. Net isosteric heat of adsorption decreased from 15.77 to 9.08 kJ/mol with an increase in equilibrium moisture content from 0.055 to 0.090 kg H2O/kg solids. The isokinetic temperature (T β) was 434.79 K, at which all the adsorption reactions took place at the same rate. The enthalpy-entropy compensation suggested that the mechanism of the adsorption pr...
... Sahyoun, NR, Jacques, PF, Zhang, XL, Juan, W., McKeown, NM, 2006. Whole-grain intake is inver... more ... Sahyoun, NR, Jacques, PF, Zhang, XL, Juan, W., McKeown, NM, 2006. Whole-grain intake is inversely associated with the metabolic syndrome and mortality in older adults. Am. J. Clin. Nutr. 83: 124 31. Professor Lucy Hwang is a Fellow of the International Academy of Food ...
Abstract Nanotechnology enables the designers to alter the structure of the packaging materials o... more Abstract Nanotechnology enables the designers to alter the structure of the packaging materials on the molecular scale, to give the materials desired properties. Simple traditional packing is to be replaced with multi-functional intelligent packaging methods to improve the food ...
This study illustrates the synthesis of gelatin based zinc oxide nanoparticle (ZnONPs) incorporat... more This study illustrates the synthesis of gelatin based zinc oxide nanoparticle (ZnONPs) incorporated nanocomposite films using different concentrations of ZnONPs. The ZnONPs were oval in shape and the size ranged from 100-200 nm. The nanocomposite films were characterized by UV-visible, FE-SEM, FT-IR, and XRD. The concentrations of ZnONPs greatly influenced the properties of nanocomposite films. The absorption peaks around 360 nm increased with the increasing concentrations of ZnONPs. The surface color of film did not change while transmittance at 280 nm was greatly reduced with increase in the concentration of ZnONPs. FTIR spectra showed the interaction of ZnONPs with gelatin. XRD data demonstrated the crystalline nature of ZnONPs. The thermostability, char content, water contact angle, water vapor permeability, moisture content, and elongation at break of nanocomposite films increased, whereas, tensile strength and modulus decreased with increase in the concentrations of ZnONPs. The gelatin/ZnONPs nanocomposite films showed profound antibacterial activity against both Gram-positive and Gram-negative food-borne pathogenic bacteria. The gelatin/ZnONP 1.5 nanocomposite film showed the best UV barrier and antimicrobial properties among the testedfilms, which indicated a high potential for use as an active food packaging films with environmentally-friendly nature.
ABSTRACT a b s t r a c t Copper nanoparticles (CuNPs) were synthesized using different types of c... more ABSTRACT a b s t r a c t Copper nanoparticles (CuNPs) were synthesized using different types of copper salts (copper acetate, copper chloride, and copper sulfate) and reducing agents (NaOH and ascorbic acid). The resulting solutions exhibited the maximum absorption peaks between 250–350 nm, which was caused by the change in the surface Plasmon resonance of CuNPs and clearly indicated the formation of CuNPs. The results of FE-SEM exhibited that the CuNPs of various shapes and size, depended upon the type of copper salts and reducing agents used. The FTIR results demonstrated the involvement of bioactive functional groups as reducing and capping agents. XRD spectra confirmed the crystalline nature of CuNPs. Furthermore, all the CuNPs exhibited strong antimicrobial activity against both, Gram-positive (Listeria monocytogenes) and Gram-negative (Escherichia coli) food-borne pathogens. &amp; 2014 Elsevier B.V. All rights reserved.
The moisture sorption isotherms of vacuum-dried edible green alga (Capsosiphon fulvescens) powder... more The moisture sorption isotherms of vacuum-dried edible green alga (Capsosiphon fulvescens) powders were determined at 25, 35, and 45°C and water activity (a w) in the range of 0.11~0.94. An inversion effect of temperature was found at high water activity (>0.75). Various mathematical models were fitted to the experimental data, and Brunauer, Emmett, and Teller model was found to be the most suitable model describing the relationship between equilibrium moisture content and water activity (<0.45). Henderson model could also provide excellent agreement between the experimental and predicted values despite of the intersection point. Net isosteric heat of adsorption decreased from 15.77 to 9.08 kJ/mol with an increase in equilibrium moisture content from 0.055 to 0.090 kg H2O/kg solids. The isokinetic temperature (T β) was 434.79 K, at which all the adsorption reactions took place at the same rate. The enthalpy-entropy compensation suggested that the mechanism of the adsorption pr...
... Sahyoun, NR, Jacques, PF, Zhang, XL, Juan, W., McKeown, NM, 2006. Whole-grain intake is inver... more ... Sahyoun, NR, Jacques, PF, Zhang, XL, Juan, W., McKeown, NM, 2006. Whole-grain intake is inversely associated with the metabolic syndrome and mortality in older adults. Am. J. Clin. Nutr. 83: 124 31. Professor Lucy Hwang is a Fellow of the International Academy of Food ...
Abstract Nanotechnology enables the designers to alter the structure of the packaging materials o... more Abstract Nanotechnology enables the designers to alter the structure of the packaging materials on the molecular scale, to give the materials desired properties. Simple traditional packing is to be replaced with multi-functional intelligent packaging methods to improve the food ...
This study illustrates the synthesis of gelatin based zinc oxide nanoparticle (ZnONPs) incorporat... more This study illustrates the synthesis of gelatin based zinc oxide nanoparticle (ZnONPs) incorporated nanocomposite films using different concentrations of ZnONPs. The ZnONPs were oval in shape and the size ranged from 100-200 nm. The nanocomposite films were characterized by UV-visible, FE-SEM, FT-IR, and XRD. The concentrations of ZnONPs greatly influenced the properties of nanocomposite films. The absorption peaks around 360 nm increased with the increasing concentrations of ZnONPs. The surface color of film did not change while transmittance at 280 nm was greatly reduced with increase in the concentration of ZnONPs. FTIR spectra showed the interaction of ZnONPs with gelatin. XRD data demonstrated the crystalline nature of ZnONPs. The thermostability, char content, water contact angle, water vapor permeability, moisture content, and elongation at break of nanocomposite films increased, whereas, tensile strength and modulus decreased with increase in the concentrations of ZnONPs. The gelatin/ZnONPs nanocomposite films showed profound antibacterial activity against both Gram-positive and Gram-negative food-borne pathogenic bacteria. The gelatin/ZnONP 1.5 nanocomposite film showed the best UV barrier and antimicrobial properties among the testedfilms, which indicated a high potential for use as an active food packaging films with environmentally-friendly nature.
Uploads
Papers by Jong-whan Rhim