2119 lines
77 KiB
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2119 lines
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<span class="a2a_kit a2a_kit_size_32 addtoany_list" data-a2a-url="https://www.nibib.nih.gov/news-events/newsroom/fluorescent-dot-synthesis-gets-eco-friendly-%E2%80%9Cglow-%E2%80%9D" data-a2a-title="Fluorescent dot synthesis gets an eco-friendly “glow up”"><a class="a2a_button_email"><span class="a2a_svg a2a_s_a2a a2a_s_email a2a-box"><img src="/themes/custom/nibib/assets/img/email-a2a.svg" border="0" alt="Facebook" width="27" height="27"></span></a><a class="a2a_button_facebook"><span class="a2a_svg a2a_s_a2a a2a_s_facebook a2a-box"><img src="/themes/custom/nibib/assets/img/facebook-a2a.svg" border="0" alt="Facebook" width="27" height="27"></span></a><a class="a2a_button_linkedin"><span class="a2a_svg a2a_s_a2a a2a_s_linkedin a2a-box"><img src="/themes/custom/nibib/assets/img/linkedin-a2a.svg" border="0" alt="Facebook" width="27" height="27"></span></a><a class="a2a_button_twitter"><span class="a2a_svg a2a_s_a2a a2a_s_x a2a-box"><img src="/themes/custom/nibib/assets/img/x-a2a.svg" border="0" alt="Facebook" width="27" height="27"></span
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<article data-history-node-id="130356" about="/news-events/newsroom/fluorescent-dot-synthesis-gets-eco-friendly-%E2%80%9Cglow-%E2%80%9D" class="news node node--type-news is-promoted full clearfix">
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<div class="grid-col flex-auto news--type-date"><strong>
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<div class="field field--name-field-news-type field--type-entity-reference field--label-hidden field__item">Science Highlights</div>
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</strong></div>
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<div class="grid-col flex-auto news--type-date"><strong>
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<div class="field field--name-field-publication-date field--type-datetime field--label-hidden field__item">November 5, 2021</div>
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</div>
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<h3> </h3>
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<div id="node--news--more-from-author">
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<h3>Media Contacts</h3>
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<p>Karen Olsen<br/>
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<a href="mailto:nibibpress@mail.nih.gov">nibibpress@mail.nih.gov</a><br/>
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<a href="tel:301-496-3500">301-496-3500</a><br/>
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<a href="/more-content-by/karen-olsen">More by this author</a></p>
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<div class="field field--name-body field--type-text-with-summary field--label-hidden field__item"><p style="margin-bottom:12px">Fluorescent “dots”—that is, tiny particles that can emit light—have a multitude of promising biomedical applications, from helping clinicians to better identify tumor margins to delivering a drug deep in the body. However, making such dots is usually a long and tedious process that uses harsh chemicals. Now, NIBIB-funded researchers are developing a fluorescent dot that is not only easier to make, but uses environmentally friendly materials.</p>
|
||
<p>“This proof-of-principle study outlines a new, ‘green’ approach to manufacture fluorescent nanomaterials, which are up-and-coming molecules in the biomedical field,” said Tatjana Atanasijevic, Ph.D., director of the NIBIB program in Molecular Probes and Imaging Agents. “The research outlined here provides fundamental insight that could lead to a cheaper and safer way to synthesize this important type of nanoparticle.”</p>
|
||
<p>Traditional synthesis methods for fluorescent dots typically require the use of organic solvents, which are effective in helping to break down substances and facilitate chemical reactions. However, organic solvents can be flammable, volatile, and carcinogenic, and are potentially hazardous if mishandled. What’s more, the synthesis of fluorescent dots is typically time-consuming and complex, representing a variety of challenges for large-scale manufacturing.</p>
|
||
<p>But researchers from the University of Nebraska Medical Center (UNMC) are working on an alternative strategy. They are combining hyaluronic acid, a common carbohydrate, along with specific amino acids (the molecules that constitute proteins). Both of these components are abundant in our bodies, and, importantly, both of them can dissolve in water. The latter characteristic negates the need for toxic organic solvents.</p>
|
||
<p>“Unlike traditional fluorescent dots, our dots combine two naturally occurring materials,” explained senior study author Aaron Mohs, Ph.D., an associate professor in the department of pharmaceutical sciences at UNMC. “Not only does this ease the synthesis of our nanomaterial—as we can purify the dots using only water—but it also capitalizes on the biocompatibility of these molecules, potentially making them an ideal nanoparticle for a variety of different settings.” Mohs’ research on these fluorescent dots was <a href="https://pubs.acs.org/doi/10.1021/acsomega.1c01343">recently reported</a> in the journal <em>ACS Omega</em>.</p>
|
||
<figure role="group" class="align-center">
|
||
<img alt="Schematic representing how the fluorescent dots are generated" data-entity-type="file" data-entity-uuid="07c007b0-fb7f-4fc2-9c74-fd2cb91024d4" src="/sites/default/files/inline-images/Mohs%20graphic_best.jpg" width="825" height="207" loading="lazy"></p>
|
||
<figcaption>Schematic demonstrating how the fluorescent dots are generated. Credit: <em>ACS Omega</em> and author permission; see licensing information below.</figcaption>
|
||
</figure>
|
||
<p>Typically, when researchers make fluorescent particles, they use a starting material that has fluorescent properties. However, neither hyaluronic acid nor amino acids are especially fluorescent on their own. To make their dots glow, Mohs and colleagues take advantage of the unique chemistry that happens when these materials combine. As hyaluronic acid interacts with certain amino acids, the electrons that these molecules share can become confined, affecting how the electrons react when exposed to particular wavelenghts of light. This phenomenon is known as cross-linked-enhanced emission. The result? The dots glow blue under specific conditions, allowing the nanoparticles to be visualized in cells.</p>
|
||
<p>Beyond biomedical imaging applications, the researchers wanted to investigate if these fluorescent nanoparticles could be used for drug delivery. They loaded their dots with doxorubicin, a common cancer chemotherapeutic, and evaluated its drug-releasing properties and cytotoxic effects. Compared with standard doxorubicin, the doxorubicin-loaded dots released the drug more slowly in standard drug release assays and displayed enhanced killing in breast cancer cells. “While an appreciable amount of standard doxorubicin is pumped out of the cells through drug efflux mechanisms, when we entrap the drug within the dot, we are likely bypassing this effect somewhat,” explained first study author Deep Bhattacharya, Ph.D., who is now a senior scientist at Pfizer. “This entrapment in the nanodot allows for an increased therapeutic payload and prolonged doxorubicin release in cells.”</p>
|
||
<p>Mohs noted that this proof-of-concept work is just the beginning for their fluorescent dots. “We’d like to make further modifications to these dots to make them better for biological detection in tissues,” he said. “But this initial study demonstrated both the imaging and drug delivery properties of these dots, which we can make using eco-friendly materials.”</p>
|
||
<p>This study was funded by grant R01EB019449 from the National Institute of Biomedical Imaging and Bioengineering (NIBIB) and grants R21CA212500 and P30CA036727 from the National Cancer Institute (NCI).</p>
|
||
<p>Study reference: Deep S. Bhattacharya, Aishwarya Bapat, Denis Svechkarev, and Aaron M. Mohs. Water-Soluble Blue Fluorescent Nonconjugated Polymer Dots from Hyaluronic Acid and Hydrophobic Amino Acids. ACS Omega 2021 6 (28), 17890-17901. <a href="https://pubs.acs.org/action/showCitFormats?doi=10.1021%2Facsomega.1c01343&href=/doi/10.1021%2Facsomega.1c01343">DOI: 10.1021/acsomega.1c01343</a></p>
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<p><em>This Science Highlight describes a basic research finding. Basic research increases our understanding of human behavior and biology, which is foundational to advancing new and better ways to prevent, diagnose, and treat disease. Science is an unpredictable and incremental process—each research advance builds on past discoveries, often in unexpected ways. Most clinical advances would not be possible without the knowledge of fundamental basic research.</em></p>
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<p>About the artwork: This graphic was adapted for this highlight and is licensed under the Creative Commons <a href="https://creativecommons.org/licenses/by-nc-nd/4.0/legalcode">Attribution-NonCommercial-NoDerivatives 4.0 International</a> license.</p>
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