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Accuracy of Body Mass Index-defined Obesity Status in US Firefighters
Nattinee Jitnarin,Walker S.C. Poston,Christopher K. Haddock,Sara A. Jahnke,Rena S. Day 한국산업안전보건공단 산업안전보건연구원 2014 Safety and health at work Vol.5 No.3
Obesity is a significant problem affecting United States (US) firefighters. While body mass index (BMI) iswidely used to diagnose obesity, its use for this occupational group has raised concerns about validity. We examined rates and types of misclassification of BMI-based obesity status compared to body fatpercentage (BF%) and waist circumference (WC). Male career firefighters (N ¼ 994) from 20 US departmentscompleted all three body composition assessments. Mean BMI, BF%, and WC were 29 kg/m2,23%, and 97 cm, respectively. Approximately 33% and 15% of BF%- and WC-defined obese participantswere misclassified as non-obese (false negatives) using BMI, while 8% and 9% of non-obese participantsdefined by BF% andWC standards were identified as obese (false positives) using BMI. When stratified byrace/ethnicity, Pacific Islanders showed high rates of false positive misclassification. Precision in obesityclassification would be improved by using WC along with BMI to determine firefighters’ weight status.
A Study of Thermal Properties of LDPE-Nanoclay Composite Films
Nattinee Bumbudsanpharoke,Seonghyuk Ko 한국포장학회 2015 한국포장학회지 Vol.21 No.3
This work focused on the study of thermal properties and kinetic behavior of LDPE- nanoclay composite films. The effect of nanoclay content (0.5, 1, 3, and 5 wt%) on thermal stability and crystallization characteristics of the nanocomposites were investigated by Thermogravimetric Analysis (TGA) and Differential Scanning Calorimetry (DSC). The results from endothermic curve showed that the nanoclay played an important role in the crystallization of nanocomposites by acting as nucleating agent. From exothermic curve, there was a crystallization temperature shift which was attributed to crystallization process induced by nanoclay. The TGA results showed that the addition of nanoclay significantly increased the thermal stability of LDPE matrix, which was likely due to the characteristic of layered silicates/ clays dispersed in LDPE matrix as well as the formation of multilayered carbonaceous- silicate char. A well-known Coats- Redfern method was used to evaluate the decomposition activation energy of nanocomposite. It was demonstrated that introducing of nanoclay to LDPE matrix escalated the activation energy of nanocomposite decomposition resulting in thermal stability improvement.
A Review on Use of Carbohydrate-based Fillers and Pigments in Packaging Paper
Nattinee Bumbudsanpharoke,고성혁 한국포장학회 2016 한국포장학회지 Vol.22 No.3
As one of traditional packaging materials, paper and paperboard are being more popular and beneficial thanks to their environmental sustainability and have been widely used in packaging applications, from light weight infusible tissue for tea/coffee bags to heavy duty boards for the distribution. Papermakers have to design the products having a desired customized function with their paper machine. Globally, the use of filler and pigment in papermaking is now a very common practice to meet the needs of customers. Many benefits can be achieved as a result of filler addition, which mainly includes cost and energy savings. The replacement of traditional mineral fillers and pigments with biodegradable and renewable carbohydrate polymers is a very interesting and promising research topic due to the concern of environmental impact. In this review paper, the use of traditional and novel carbohydrate fillers and pigments in cellulosic paper is highlighted. It is noteworthy that there are still some challenges and technical barriers associated with the use of these organic materials in point of structural stabilities and manufacturing costs, although most of them are available in market as the commercialized products. With the emerging nanotechnologies, it is believed that the use of carbohydrate-based filler and pigment for papermaking will increase and bring technical advantages to industry.
In Situ Bio-Inspired Synthesis of Gold Nanoparticles on Cellulose Fiber
Bumbudsanpharoke, Nattinee,Choi, Jungwook,Ko, Seonghyuk American Scientific Publishers 2016 Journal of Nanoscience and Nanotechnology Vol.16 No.7
<P>We investigated the in situ synthesis of gold nanoparticles (AuNPs) on unbleached softwood kraft pulp via a green approach without any additional reducing agents or external linker molecules. The structure and properties of the AuNPs composite fibers were characterized by UV-Vis diffuse reflectance spectroscopy (DRS), X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), Fourier transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS). The resulting cellulose fiber-AuNPs composite exhibited an obvious change in color from pale yellow to purple, wine-red and dark brown due to surface plasmon resonance of the nanogold. UV-Vis DRS and FESEM images confirmed the formation of gold nanoparticles on the fiber surface. In FTIR spectra, the intensity of a shoulder band at about 1550 to 1650 cm(-1) assigned to phenol and electron rich aromatic methoxy functional groups in lignin decreased in fiber-AuNPs composite sheets, indicating that lignin plays an essential role in cellulose fiber-based green synthesis of nanoparticles. It was also revealed that gold nanoparticles formed on the fiber were well-defined pure metallic gold, suggesting that Au3+ ions are efficiently bio-reduced to Au-0, attributed to the electron rich lignin component, and bind to the fiber surface. The preparative procedure presented here is facile and provides a simple route to synthesize and immobilize AuNPs in an environmentally friendly manner.</P>
Facile Biosynthesis and Antioxidant Property of Nanogold-Cellulose Fiber Composite
Bumbudsanpharoke, Nattinee,Choi, Jungwook,Park, Insik,Ko, Seonghyuk Hindawi Limited 2015 Journal of nanomaterials Vol.2015 No.-
<P>Direct synthesis of gold nanoparticles (AuNPs) on cellulose fiber has been successfully performed via facile green approach using lignin-containing unbleached kraft softwood pulp. The resulting AuNPs composited fibers showed apparent color change from pale yellow to purplish-dark brown by varying the amount of gold ions (Au<SUP>3+</SUP>) due to the surface plasmon resonance of nanogold. Further confirmation of AuNP formation on the fiber surface was conducted by UV-Vis diffuse reflectance spectroscopy (DRS), X-ray diffraction (XRD), and field emission scanning electron microscopy (FE-SEM). X-ray photoelectron spectroscopy (XPS) analysis revealed that gold nanoparticles formed on the fiber are well-defined pure metallic gold, indicating that Au<SUP>3+</SUP>ions are efficiently bioreduced into Au<SUP>0</SUP>and bind to the fiber surface. Antioxidant activity was evaluated by decomposition of 2,2-diphenyl-1-picryl-hydrazyl (DPPH) in dark and light condition. As-prepared unbleached kraft fiber-AuNP composite showed significantly enhanced antioxidant activity and its DPPH scavenging rate reached about 86.05%.</P>
A Study of Thermal Properties of LDPE-Nanoclay Composite Films
Bumbudsanpharoke, Nattinee,Ko, Seonghyuk Korea Society of Packaging Science and Technology 2015 한국포장학회지 Vol.21 No.3
This work focused on the study of thermal properties and kinetic behavior of LDPE-nanoclay composite films. The effect of nanoclay content (0.5, 1, 3, and 5 wt%) on thermal stability and crystallization characteristics of the nanocomposites were investigated by Thermogravimetric Analysis (TGA) and Differential Scanning Calorimetry (DSC). The results from endothermic curve showed that the nanoclay played an important role in the crystallization of nanocomposites by acting as nucleating agent. From exothermic curve, there was a crystallization temperature shift which was attributed to crystallization process induced by nanoclay. The TGA results showed that the addition of nanoclay significantly increased the thermal stability of LDPE matrix, which was likely due to the characteristic of layered silicates/clays dispersed in LDPE matrix as well as the formation of multilayered carbonaceous-silicate char. A well-known Coats-Redfern method was used to evaluate the decomposition activation energy of nanocomposite. It was demonstrated that introducing of nanoclay to LDPE matrix escalated the activation energy of nanocomposite decomposition resulting in thermal stability improvement.
Accuracy of Body Mass Index-defined Obesity Status in US Firefighters
Jitnarin, Nattinee,Poston, Walker S.C.,Haddock, Christopher K.,Jahnke, Sara A.,Day, Rena S. Occupational Safety and Health Research Institute 2014 Safety and health at work Vol.5 No.3
Obesity is a significant problem affecting United States (US) firefighters. While body mass index (BMI) is widely used to diagnose obesity, its use for this occupational group has raised concerns about validity. We examined rates and types of misclassification of BMI-based obesity status compared to body fat percentage (BF%) and waist circumference (WC). Male career firefighters (N = 994) from 20 US departments completed all three body composition assessments. Mean BMI, BF%, and WC were $29kg/m^2$, 23%, and 97 cm, respectively. Approximately 33% and 15% of BF%- and WC-defined obese participants were misclassified as non-obese (false negatives) using BMI, while 8% and 9% of non-obese participants defined by BF% and WC standards were identified as obese (false positives) using BMI. When stratified by race/ethnicity, Pacific Islanders showed high rates of false positive misclassification. Precision in obesity classification would be improved by using WC along with BMI to determine firefighters' weight status.