Open menu

Nanotechnology Spotlight

Behind the buzz and beyond the hype:
Our Nanowerk-exclusive feature articles

RSS Subscribe to our Nanotechnology Spotlight feed

Showing Spotlights 33 - 40 of 130 in category Risks, Toxicology, Biocompatibility (newest first):

 

A biophysical perspective of understanding nanoparticles at large

nanoparticlesAt the core of research efforts to determine the impact of synthetic nanoparticles on the environment and living systems is a fundamental understanding of the interactions between man-made nanoparticles and natural living systems that have evolved over millions of years. To describe nanoparticles at large, it may be beneficial to acknowledge that 1) biological systems are part of the food chain and therefore an essential component of the ecosystems and 2) collaborations are essential for such interdisciplinary research. Researchers have now presented a biophysical perspective that describes the fate of nanoparticles in both the aqueous phase and in living systems.

Posted: Mar 16th, 2011

Biomedical applications of nanodiamonds might require more caution

nanodiamondsOwing to their large surface area, strong infrared photoluminescence and magnetic properties, nanodiamonds are promising for various biomedical applications, including as drug/gene carriers and alternatives to the current bio-imaging platforms. However, the biomedical applications will hardly be realized unless the potential hazards of nanodiamonds to humans and other biological systems are ascertained. The biocompatibility of nanodiamonds at the cellular level has been confirmed by many independent studies. Following these earlier cytotoxicity studies, many groups have used nanodiamonds and their functionalized derivatives for drug/gene deliveries. In spite of the earlier reports that nanodiamonds are biocompatible at the cellular level, researchers have now demonstrated in a new study that nanodiamonds can activate DNA repair proteins in embryonic stem cells, suggesting possible DNA damages.

Posted: Mar 10th, 2011

A practical approach to managing nanomaterial safety in the lab

lab_safetyThere is a need for the larger nanotechnology community synthesizing, applying or characterizing nanomaterials to have a methodology to evaluate the risk and to apply adequate protection measures to limit human exposure. Researchers in Switzerland have now taken the initiative and presented a practical, user-friendly procedure for a university-wide safety and health management of nanomaterials, developed as a multi-stakeholder effort (government, accident insurance, researchers and experts for occupational safety and health). The procedure consists of two parts: Using a decision tree, nano-labs are sorted into three hazard classes, which corresponds to analogue approaches applied to other hazard types (biohazard, radioprotection or chemistry). A list of required prevention/protection measures (safety barriers) for each hazard level is then provided.

Posted: Feb 14th, 2011

Another peek into how carbon nanotubes may interfere with the human immune system

carbon_nanotubesThe toxicity issues surrounding carbon nanotubes (CNTs) are highly relevant for two reasons: Firstly, as more and more products containing CNTs come to market, there is a chance that free CNTs get released during their life cycles, most likely during production or disposal, and find their way through the environment into the body. Secondly, and much more pertinent with regard to potential health risks, is the use of CNTs in biological and medical settings. Some groups are using CNTs in research for vaccination as well as gene and cancer therapy. Here, the CNT applications are designed to interact directly with the immune system. Understanding the interplay between CNTs and immune proteins is therefore critical for both improving CNT applications in biology and medicine and avoiding potentially noxious immune responses.

Posted: Jan 13th, 2011

Science policy considerations for responsible nanotechnology decisions

science_policyAlthough the literature grows on the use of science to inform decisions on the environmental, health and safety implications of nanotechnology, little has been published by those who make such decisions. In a recent commentary in Nature Nanotechnology, officials of the US Environmental Protection Agency (EPA), the European Commission and the Organisation for Economic Co-operation and Development (OECD), discuss the types of decision facing government regulators, the new considerations nanotechnology brings to decision-making, the role of science in informing decisions, how regulators cooperate internationally on policy issues, and the challenges that lie ahead. The authors provide an overview of key reports and regulations and then discuss the complexity of issues with regard to addressing nanomaterials within the context of existing regulations and the need to weigh nanomaterial risk and benefits.

Posted: Dec 21st, 2010

Can nanoparticles end up in the brain?

brainThe use of minute particles as drug carriers for targeted therapy has been studied and discussed for more than 20 years. A selective accumulation of active substances in target tissues has been demonstrated for certain so-called nanocarrier systems that are administered bound to pharmaceutical drugs. Great expectations are placed on nanocarrier systems that can overcome natural barriers such as the blood-brain barrier (BBB) and transport the medication directly to the desired tissue and thus heal neurological diseases that were formerly incurable. The BBB represents the border between the circulating blood and the fluid in the central nervous system. It functions to protect the sensitive nerve cells from foreign substances and infections from the blood. Whether nanoparticles enter the central nervous system unintentionally and induce health problems is also being debated.

Posted: Dec 8th, 2010

Predicting the toxicological effects of nanomaterials with novel modeling approach

quantitative_modelingIn a new research field that could be called 'experimental nanotoxicology', scientists have now, for the first time, demonstrated that biological effects of manufactured nanoparticles can be predicted using their chemical, physical, and geometrical properties. The results successfully demonstrate the high potential of cheminformatics approaches for improving the experimental design and prioritizing the biological testing of novel manufactured nanoparticles. The team modeled their approach after a process used in drug design and chemical synthesis, where the chemical structure of a new compound is quantitatively correlated with a well defined process, such as biological activity or chemical reactivity. Such a Quantitative Structure Activity Relationship (QSAR) can then be utilized to help guide chemical synthesis and drug design. They termed their approach quantitative nanostructure-activity relationship (QNAR) modeling.

Posted: Nov 8th, 2010

Nanotoxicology myth buster

laboratoryUnderstanding the behavior and impacts of nanomaterials in the environment and in human health is a daunting task. Today, we don't even know what the impact of most chemicals is, and that includes products we have been using for many years. Nevertheless, a general understanding about nanotoxicity is slowly emerging as the body of research on cytotoxicity, genotoxicity, and ecotoxicity of nanomaterials grows. Many of the published toxicity studies have limited relevance, due, in large part, to study design limitations, including inadequate justification for dose selection or route of exposure criteria. A recently published article addresses myths and misconceptions regarding nanotoxicology.

Posted: Nov 2nd, 2010