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Search Publications by: Lee L. Yu (Fed)

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Displaying 26 - 50 of 72

SI traceable determination of arsenic species in kelp (Thallus laminariae)

June 26, 2017
Lee L. Yu, Rolf L. Zeisler, Rachel C. Stanoyevitch
Kelp is a dietary supplement that contains significant amount of arsenic. Accurate assessment of dietary safety of kelp requires the determination of the arsenic species therein. A procedure was developed to extract the hydrophilic fraction of arsenicals

Separation, Sizing, and Quantitation of Engineered Nanoparticles in an Organism Model Using Inductively Coupled Plasma Mass Spectrometry and Image Analysis

December 16, 2016
Monique E. Johnson, Shannon Hanna, Antonio R. Montoro Bustos, Christopher M. Sims, Lindsay C. Elliott, Babak Nikoobakht, John T. Elliott, Richard D. Holbrook, Keana C. Scott, Karen E. Murphy, Elijah J. Petersen, Lee L. Yu, Bryant C. Nelson, Akshay Lingayat, Adrian C. Johnston
For environmental studies assessing uptake of orally ingested engineered nanoparticles (ENPs), a key step in ensuring accurate quantification of ingested ENPs is efficient separation of the organism from ENPs that are either nonspecifically adsorbed to the

Investigating the Process of Surface Degradation and Nanoparticle Release of a Commercial Nanosilica / Polyurethane Coating Under UV Exposure

March 11, 2015
Deborah S. Jacobs, Yu L. Cheng, Savelas A. Rabb, Peter J. Krommenhoek, Lee L. Yu, Tinh Nguyen, Li Piin Sung
Considerable research has shown that many coatings properties such as mechanical, electrical, and ultra violet (UV) resistance are greatly enhanced by the addition of nanoparticles, which can potentially increase the use of nanocoatings for many outdoor

An approach for identification and determination of arsenic species in the extract of kelp

March 3, 2015
Lee L. Yu, Rolf L. Zeisler, Rabia Oflaz, Wei Chao, Junting Tong, Haixia Bao, Jun Wang
The National Institute of Standards and Technology is developing a kelp standard reference material (SRM) in support of dietary supplement measurements. Edible seaweeds such as kelp and laver consumed as diet or dietary supplement contain tens of mg/kg

Using Single Particle ICP-MS as a Tool for Understanding Metallic Nanoparticle Transformation during Nanotoxicity Assays

July 1, 2014
Monique E. Johnson, Shannon Hanna, Antonio R. Montoro Bustos, Bryant C. Nelson, Elijah J. Petersen, Lee L. Yu
The advent of engineered nanoparticles (ENPs) and their increased use has remarkably improved the performance of basic materials and consumer products, but has also increased the potential for ENP release into the environment. Technical procedures, more

Effects of Temperature on Surface Accumulation and Release of Silica Nanoparticles in an Epoxy Nanocoating Exposed to UV Radiation

June 16, 2014
Chun-Chieh Tien, Ching-Hsuan Chang, Bernard Hao-Chih Liu, Deborah Jacobs, Savelas A. Rabb, Lee L. Yu, Tinh Nguyen, Li Piin Sung
Polymer nanocoatings are increasingly used outdoors and in harsh environments. However, because most common polymers degraded by the weathering elements, nanoparticles in polymer nanocoatings may be released into the environments. Such nanoparticle release

A Quantitative Study of Nanoparticle Release from Nanocoatings Exposed to UV Radiation

April 7, 2014
Li Piin Sung, Deborah S. Jacobs, Justin M. Gorham, Savelas A. Rabb, Xiaohong Gu, Lee L. Yu, Tinh Nguyen
Nanoparticles are increasingly used in polymer coatings (i.e., nanocoatings) to improve multiple properties of traditional coatings such as mechanical, electrical, gas barrier, and UV resistance. These high performance nanocoatings are often used in

Certification of Total Arsenic in Blood and Urine Standard Reference Materials by Radiochemical Neutron Activation Analysis and Inductively Coupled Plasma Mass Spectrometry

March 1, 2014
Rick L. Paul, William C. Davis, Karen E. Murphy, Colleen E. Bryan Sallee, Lee L. Yu, William F. Guthrie, Dennis D. Leber, Thomas W. Vetter
A newly developed procedure for determination of arsenic by radiochemical neutron activation analysis was used to measure arsenic in SRM 955c Toxic Elements in Caprine Blood and SRM 2668 Toxic Elements in Frozen Human Urine for the purpose of providing

Certification of Elements in and Use of Standard Reference Material 3280 Multivitamin/Multielement Tablets

December 2, 2013
Gregory C. Turk, Katherine E. Sharpless, Steven J. Christopher, Danielle Cleveland, Russell D. Day, Stephen E. Long, Elizabeth A. Mackey, Anthony F. Marlow, Rick L. Paul, John R. Sieber, Rabia Oflaz, Laura J. Wood, Lee L. Yu, Rolf L. Zeisler, Stephen A. Wise, James H. Yen, E. Greene, J. Harnly, I-P Ho, Joseph M. Betz, R. Q. Thompson, Candace Jongsma
Standard Reference Material (SRM) 3280 Multivitamin/Multielement Tablets was issued by the National Institute of Standards and Technology (NIST) in 2009 and has certified and reference mass fraction values for 13 vitamins, 26 elements, and 2 carotenoids

A simple and sensitive HPLC-ICP-MS method for the accurate determination of Vitamin B12 in Fortified Breakfast Cereals and Multivitamin Tablet Reference Materials

April 10, 2013
Siva K. Chinthalapati, Lee L. Yu, John E. Schiel, Stephen E. Long
A sensitive high performance liquid chromatography (HPLC) coupled with inductively coupled plasma mass spectrometry (ICP-MS) method has been developed for the determination of vitamin B12. The method was based on efficient isocratic separation with a

Salivary Antigen-5/CAP Family Members Are Cu 2+ -dependent Antioxidant Enzymes That Scavenge O 2 -. and Inhibit Collagen-induced Platelet Aggregation and Neutrophil Oxidative Burst

April 4, 2013
Teresa Assumpcao, Dongying Ma, Alexandra Schwarz, Karine Reiter, Jaime Santana, John Andersen, Jose Ribeiro, Glen Nardone, Lee L. Yu, Ivo Francischetti
The function of the antigen-5/CAP family of proteins found in the salivary gland of bloodsucking animals has remained elusive for decades. Antigen-5 members from the hematophagous insects Dipetalogaster maxima (DMAV) and Triatoma infestans (TIAV) were

Characterization of Perchlorate in a New Frozen Human Urine Standard Reference Material

October 1, 2012
Lee L. Yu, William C. Davis, Rabia Oflaz, Gregory C. Turk, Jeff M. Jarrett, Liza Valentin, Benjamin C. Blount, Dennis D. Leber, Eric L. Kilpatrick
Perchlorate, an inorganic anion, has recently been recognized as an environmental contaminant by the U.S. Environmental Protection Agency (EPA). Assessment of human exposure to perchlorate requires measurement of the anion in urine. Although the

Characterization of Surface Accumulation and Release of Nanosilica During Irradiation of Polymer Nanocomposites with Ultraviolet Light

August 12, 2012
Tinh Nguyen, Bastien T. Pellegrin, Coralie Bernard, Savelas A. Rabb, Paul E. Stutzman, Justin M. Gorham, Xiaohong Gu, Lee L. Yu, Joannie W. Chin
Nanofillers are increasingly used for enhancing multiple properties of polymeric materials in many applications. However, polymers are susceptible to photodegradation by solar ultraviolet (UV) radiation Therefore, nanofillers in a polymer nanocomposite

Quantification of ligand packing density on gold nanoparticles using ICP-OES

February 18, 2012
Sherrie R. Elzey, De-Hao D. Tsai, Savelas A. Rabb, Lee L. Yu, Michael R. Winchester, Vincent A. Hackley
In this study, a prototypical thiolated organic ligand, 3-mercaptopropionic acid (MPA), was conjugated on gold nanoparticles (AuNPs), and packing density was measured on an ensemble-averaged basis using inductively coupled plasma optical emission


November 26, 2011
Steven J. Christopher, Eric L. Kilpatrick, Lee L. Yu, William C. Davis, blakely adair
NIST has performed preliminary research on applying a calibration methodology based on the method of standard additions to the quantification of lanthanide-labeled peptides via reverse-phase liquid chromatography coupled to inductively coupled plasma mass

A Human Urine Standard Reference Materials for Accurate Assessment of Arsenic Exposure

March 17, 2011
Lee L. Yu, Carl Verdon, William C. Davis, Gregory C. Turk, Kathleen Caldwell, Robert Jones, Brian Buckley, Ruimin Xie
Arsenic is a toxic element, and the toxicity of the element is dependent upon the molecular form it is in. Accurate assessments of arsenic exposure require the measurement of a complete panel of inorganic, organic, and metabolite As species in urine

Elemental Analysis of a Single-Walled Carbon Nanotube Candidate Reference Material

October 15, 2010
Rolf L. Zeisler, Rick L. Paul, Rabia Oflaz, Lee L. Yu, Jacqueline L. Mann, William R. Kelly, Brian E. Lang, Stefan D. Leigh, Jeffrey A. Fagan
A material containing single-walled carbon nanotubes (SWCNTs) together with other carbon species, cata-lyst residues, and trace element contaminants has been prepared by the National Institute of Standards and Technology for characterization and

Translational Considerations for Cancer Nanomedicine

September 1, 2010
Stephen T. Stern, Jennifer B. Hall, Lee L. Yu, Laura J. Wood, Giulio F. Paciotti, Lawrence Tamarkin, Stephen E. Long, Scott E. McNeil
There are many important considerations during preclinical development of cancer nanomedicines, including: 1) unique aspects of animal study design; 2) the difficulties in evaluating biological potency, especially for complex formulations; 3) the