Adv Mater (Weinheim, Ger) 2002, 14:1321.CrossRef 26. Pecharromán C,

Iglesias CH5424802 J: Effective dielectric properties of packed mixtures of insulator particles. Phys Rev B Condens Matter 1994, 49:7137.CrossRef 27. Ribeiro WC, Araújo RGC, Bueno PR: The dielectric suppress and the control of semiconductor non-Ohmic feature of CaCu 3 Ti 4 O 12 by means of tin doping. Appl Phys Lett 2011, 98:132906.CrossRef 28. Ramírez MA, Bueno PR, Varela JA, Longo E: Non-Ohmic and dielectric properties of a CaCu 3 Ti 4 O 12 polycrystalline system. Appl Phys Lett 2006, 89:212102.CrossRef 29. Thongbai P, Putasaeng B, Yamwong T, Maensiri S: Improved dielectric and non-ohmic properties of Ca 2 Cu 2 Ti 4 O 12 ceramics prepared by a polymer pyrolysis method. J Alloys Compd 2011, 509:7416.CrossRef Competing interests The authors declare that they have no competing interests. Authors’ contributions WT carried out all the experiments, except for the preparation of Au nanoparticles. SS prepared Au nanoparticles. BIRB 796 manufacturer BP and TY offered technical support for the dielectric and I-V measurements. AC and PT supervised the research, designed the experiments, and participated in preparing

the draft of the manuscript. PT revised the manuscript. VA and SM gave suggestions on the study. All authors read and approved the final manuscript.”
“Background ZnO nanoparticles with a unique optical, electrical, and thermal performance have been widely used in the field of catalysis,

sunscreen cosmetics, paint materials, and food packaging materials [1, 2]. The chemical and physical properties of nanoparticles have a strong influence on the way they interact with biological components or the environment [3] and also on the way they move, accumulate, and clear in the body [4, 5]. Industrial food processing is intended to modify flavor, texture, and storage behavior by mixing with zinc oxide nanoparticles (ZnO NPs). After ingestion of food containing ZnO NPs, mechanical (chewing and selleck screening library peristalsis) and chemical (interaction with intestinal enzymes) processes reduce food into smaller components to maintain physiological processes. Much research has shown that ZnO NPs cause cytotoxicity to many types of cells, such as osteoblast cancer cells [6], human bronchial Nitroxoline epithelial cells (BEAS-2B) [7], human kidney cells [8], human alveolar adenocarcinoma cells [9], human hepatocytes, and embryonic kidney cells [10]. Relevant studies report that ZnO nanoparticles primarily cause disease to organs including the stomach and intestines. Human epithelial colorectal adenocarcinoma (Caco-2) cell lines are a continuous line of heterogeneous epithelial colorectal adenocarcinoma cells as a confluent monolayer. In vitro measurements are not only rapid and easy to perform, but are also used to predict in vivo toxicity. In in vivo experiments, the dose is an important factor in mice.