title: Measurement of nanomaterials in foods: integrative consideration of challenges and future prospects.
abstract: The risks and benefits of nanomaterials in foods and food contact materials receive conflicting international attention across expert stakeholder groups as well as in news media coverage and published research. Current nanomaterial characterization is complicated by the lack of accepted approaches to measure exposure-relevant occurrences of suspected nanomaterials in food and by broad definitions related to food processing and additive materials. Therefore, to improve understanding of risk and benefit, analytical methods are needed to identify what materials, new or traditional, are "nanorelevant" with respect to biological interaction and/or uptake during alimentary tract transit. Challenges to method development in this arena include heterogeneity in nanomaterial composition and morphology, food matrix complexity, alimentary tract diversity, and analytical method limitations. Clear problem formulation is required to overcome these and other challenges and to improve understanding of biological fate in facilitating the assessment of nanomaterial safety or benefit, including sampling strategies relevant to food production/consumption and alimentary tract transit. In this Perspective, we discuss critical knowledge gaps that must be addressed so that measurement methods can better inform risk management and public policy.
authors.affiliation: Materials Measurement Science Division, National Institute of Standards and Technology , Gaithersburg, Maryland 20899-8371, United States.
authors.forename: Christopher
authors.initials: C
authors.lastname: Szakal
authors.forename: Stephen M
authors.initials: SM
authors.lastname: Roberts
authors.forename: Paul
authors.initials: P
authors.lastname: Westerhoff
authors.forename: Andrew
authors.initials: A
authors.lastname: Bartholomaeus
authors.forename: Neil
authors.initials: N
authors.lastname: Buck
authors.forename: Ian
authors.initials: I
authors.lastname: Illuminato
authors.forename: Richard
authors.initials: R
authors.lastname: Canady
authors.forename: Michael
authors.initials: M
authors.lastname: Rogers
mesh_terms: D000818:Animals; D005504:Food Analysis / Q000379:methods*; D006801:Humans; D049329:Nanostructures / Q000032:analysis*