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India: Biomedical Technology Researchers Develop Microreactor to Produce Uniform Sized Nanoparticles

| Editor: Ahlam Rais

With the unique microreactor, Indian researchers from the Agharkar Research Institute in Pune have been able to fulfill a major requirement in biomedical technology – production of uniform sized nanoparticles in large quantities.

Schematic of the microreactor.
Schematic of the microreactor.
(Source: Agharkar Research Institute)

Delhi/India – Scientists from Pune based Agharkar Research Institute (ARI), an autonomous institute under the Department of Science & Technology (DST), Government of India have developed a microreactor that can produce large quantities of uniform sized nanoparticles, thus serving a major requirement in biomedical technology.

The device could synthesise metal, semiconductor, and polymer nanoparticles by the continuous flow active microreactor. Dr. Dhananjay Bodas and his team from ARI who put together this microreactor on the basis of their earlier studies published in the journals ‘Materials Science and Engineering’ and ‘ACS Applied Materials and Interface’ also discovered that the parameters such as concentration of reactants, flow rate, agitation, reaction temperature as well as time, determined the size of nanoparticles and their distribution.

They further derived a mathematical equation using dimensional analysis to predict process parameters accurately for achieving true monodispersity (maintaining a uniform size of nanoparticles), and succeeded in synthesising uniform sized nanoparticles in continuous flow active microreactors (a device in which chemical reactions take place in a confinement with dimensions below 1 mm) with support from Serb, DST.

Figure a) Schematic of the microreactor. Figure b) Optical image microreactor.
Figure a) Schematic of the microreactor. Figure b) Optical image microreactor.
(Source: Agharkar Research Institute)

Nanoparticles possess unique size-dependent properties, which make them useful in biomedical technology but difference in their sizes which arise due to conventional methods of synthesising them reduces their efficiency. Maintaining a uniform size of the nanoparticles is a challenge faced by the biomedical industry. Besides, these methods use multiple reagents, are time consuming and produce toxic by-products.

"Using this method, we have now been able to produce gold and silver, cadmium-telluride, chitosan, alginate and hyaluronic acid nanoparticles of any size with coefficient of variation below five per cent," asserted Dr. Bodas.

"We have observed that monodispersed silver nanoparticles show significant improvement in effectivity as an antimicrobial agent. Monodispersed chitosan and alginate nanoparticles display very high drug entrapment, sustained-release rate, and are biocompatible. They could be passively internalised in the cells due to the uniform and small size. Polymer coated cadmium-telluride quantum dots possess size-tunable fluorescence, high quantum efficiency, and biocompatibility which are required for multiplexed bio imaging," said Dr. Bodas.

Researchers said the new approach in resolving the monodispersity paradox could be of immense value to researchers working in the field of nanoscience and nanotechnology and the technique may be applied to other chemical reactions where stringent control on the reaction dynamics is vital.

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