Archive for October, 2015

HOT article: Microgel coating of magnetic nanoparticles via bienzyme mediated free-radical polymerization for colorimetric detection of glucose

Researchers from Qigang Wang’s group have developed a new strategy for the fabrication of core shell magnetic microgels for glucose detection, which is one of the most frequently used tests in clinical environments. Magnetic nanoparticles containing carboxylic acid groups on the surface were used as a starting material to covalently bind the enzyme glucose oxidase (GOx). A second enzyme, horseradish peroxidase, was also attached through a bifunctional polyethylene glycol polymer which ensured a working distance between the two immobilised enzymes. The microgels could be formed by adding glucose and acetylacetone (ACAC) with PEGMA and crosslinker PEGDA. One of the by-products of glucose oxidation, hydrogen peroxide, reacts with ACAC to form radicals that polymerise the monomers resulting in a gel-like coating formed around the enzyme containing particles.

The preparation of the magnetic core–shell microgels.

After polymerisation the enzymes retained their reactivity. Even after 7 days storage, 96% catalytic activity was observed with respect to a fresh sample. The high selectivity towards glucose was demonstrated with other sugars e.g. fructose, lactose and maltose. It is thought that this strategy could be extended to the detection of other biomolecules through new oxidase-HRP systems, as well as being easily translatable to clinical fields.

Microgel coating of magnetic nanoparticles via bienzyme-mediated free-radical polymerization for colorimetric detection of glucose
Qing Wu, Xia Wang, Chuanan Liao, Qingcong Wei and Qigang Wang
Nanoscale, 2015,7, 16578-16582. DOI: 10.1039/C5NR05716G

Dr Mike Barrow is a guest web writer for the Nanoscale blog, he currently works as a Postdoctoral Researcher at the University of Liverpool. Twitter: @mikesyb

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Call for Nanotechnology Data Reporting Guidelines

Dr. Mervi Heiskanen

Dr. Stephanie Morris

The authors of this article are both Program Managers based at the US National Cancer Institute’s (NCI) Center for Biomedical Informatics and Information Technology and Office of Cancer Nanotechnology Research, respectively, working towards improving quality of and access to published experimental data.

In recent years, there has been increasing interest in improving how nanomaterials are defined and characterized due to a lack of specific nano-related metadata standards in the Nanotechnology field. The nano-community agrees data reporting guidelines would facilitate data reproducibility and reuse.

The recent collaboration between Elsevier Journals and the NCI cancer Nanotechnology Laboratory (caNanoLab) data portal is an important step towards providing researchers with easy access to high quality nanotechnology data for reproduction and re-use. However, access to data is only useful if information about experimental details is available. Is there something we can do to improve usability of nanotechnology data?

The lack of high quality nanotechnology research data is a known challenge, further complicated by the diversity and growing number of nanomaterials. The OMICs communities (e.g., genomics and proteomics) have pioneered the development of databases such as the Gene Expression Omnibus (GEO) Database and the Worldwide Protein Data Bank (wwPDB), as well as standard guidelines for recording data. These guidelines define the minimum information that must be reported and stored, and facilitate data reproducibility and integration across different datasets to enable further analysis by the research community. Many of these reporting guidelines can be accessed at Biosharing, and are required by journals for data deposition during the manuscript submission process.

Several STM journals already require authors to adhere to minimum characterization requirements, particularly when reporting new chemical compounds, which reviewers are asked to evaluate to ensure reproducibility and reliability of the research. Nature and its sister journals have further enforced this for their life science articles by implementing an initiative which includes the submission of a checklist by authors intended to remind them to provide sufficient experimental details to enable reproducibility. However, we need to agree on a nanotechnology-specific checklist, and extend the reproducibility initiative to include other relevant journals. This needs to be a collaborative effort driven by the research community, editors and publishers, regulatory agencies, and funding organizations in order for this to become common practice and lead to improvements in data reuse.

The nanotechnology community is in the early stages of defining metadata that should be included in data submissions, and recognizes the metadata will differ by research field (e.g., biomedicine, ecological studies, and health and safety). Examples of nanomaterial databases working towards this goal include caNanoLab, which uses MinChar, and the Nanomaterial Registry’s Minimal Information about Nanomaterials (MIAN). However, there is no common minimal information guideline agreed upon by the larger nanotechnology community. The need for the development of a common reporting recommendation has been recognized by the NCI Nanotechnology Working Group (NCI Nano WG). With active participants from federal institutions, academia, and industry, primarily from the US and the NanoSafety Cluster in Europe, the NCI Nano WG can serve as a coordinating body for collecting community input across nanotechnology research fields. A nanotechnology minimal information standard is also of great interest to the US National Nanotechnology Initiative, which has developed a signature initiative on nanoinformatics (Nanotechnology Knowledge Infrastructure) that works with the nanotechnology community to provide resources and tools.

We believe that data submission guidelines combined with better access to data will improve data quality and reproducibility and will ultimately translate to advances in areas such as biomedical research, environmental safety, and nanomanufacturing. Collaboration and coordination among all stakeholders is needed to ensure data submission guidelines benefit all parties.

If everyone is moving forward together, then success takes care of itself.” – Henry Ford

DisclosureViews expressed in this web article are those of the authors and do not necessarily reflect the views or polices of the Department of Health and Human Services, nor does mention of trade names, commercial products, or organizations imply endorsement by the U.S. Government.

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Hybrid nanoparticles: The fight against breast cancer heats up

Gold nanorods with cisplatin-polypeptide wrapping were developed for combinational photothermal therapy and chemotherapy of triple negative breast cancer.

Researchers from China have advanced the fight against breast cancer (BC) by developing a method that targets triple negative breast cancer (TNBC) – a highly aggressive subtype of BC and a form that is challenging to completely eradicate.

Their method consisted of the formation of gold nanorods (GNRs) with a cisplatin-polypeptide wrapping and folic acid (FA) functionalization (FA-GNR@Pt) for the simultaneous targeted photothermal therapy and chemotherapy. These hybrid nanoparticles combine the photothermal conversion properties of GNRs, superior biocompatibility of polypeptide poly(L-glutamic acid) (PGA), chemotoxicity of cisplatin and the tumour targeting ability of FA.  FA-GNR@Pt nanoparticles exhibited temperature increases both in vitro and in vivo using 655 nm NIR laser irradiation and, in combination with systemic administration in mice, were able to inhibit the proliferation and lung metastisis of the 4T1 breast tumour.

The research presented here takes significant steps in furthering the understanding of breast cancer, particularly TNBC, which have increased risk of metastisis.

Near infrared light-actuated gold nanorods with cisplatin–polypeptide wrapping for targeted therapy of triple negative breast cancer
Bing Feng, Zhiai Xu, Fangyuan Zhou, Haijun Yu, Qianqian Sun, Dangge Wang, Zhaohui Tang, Haiyang Yu, Qi Yin, Zhiwen Zhang and Yaping Li
Nanoscale, 2015, 7, 14854-14864.  DOI: 10.1039/C5NR03693C

Dr Lee Barrett is a guest web writer for the Nanoscale blog. Lee is currently a postdoctoral researcher in the Centre for Molecular Nanometrology at the University of Strathclyde. His research is currently focused on the development of nanoparticle-based sensors and surface enhanced Raman scattering (SERS). Follow him on twitter @L_Bargie.

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