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Nanoparticle Purification Technique is Suitable for Nanomedicines

 In the latest work published in the Journal of Chromatography A, researchers utilized three different types of electrostatic modified silica monoliths to develop a purification method suitable for nanomedicines.

Nanoparticle Purification Technique is Suitable for Nanomedicines

Study: A method for purifying nanoparticles using cationic modified monoliths and aqueous elution. Image Credit: HQuality/

Due to nanoparticles' extensive utilization, maintaining nanoparticle quality and preventing adverse effects have become significant focus worldwide.

Importance of Nanoparticles

The use of medications within nanotechnology (i.e., nanomedicines) is common in the medical industry as nanoparticles can boost drug-delivery effectiveness to the targeted while decreasing distribution to non-targets.

Nanomedicines are not given to the recipient directly after their creation; rather, it is sent to institutions and held until it is needed, during which time a few of the encapsulating medications may seep from the nanoparticle.

Importance of Safety and Purification Methods

For sustainable nanomedicine usage, safety, extraction, and purification technologies that remove disintegrating nanoparticles and segregate leaked pharmaceuticals from the residual nanoparticle are required to decrease the adverse consequences associated with such spilled medications.

Furthermore, if manufactured nanomedicines contain unencapsulated pharmaceuticals, their characteristics cannot be reliably characterized.

Exosomes must be isolated and purified from bodily fluids containing a high number of components before they may be used in early illness detection. As a result, there is a high urgent need to develop efficient nanoparticles extraction and purification procedures.

Nanoparticles have been purified via centrifuging technology, electrophoresis, and dissolution, among other methods. The majority of these techniques distinguish nanoparticles characteristics such as size or concentration. Because nanoparticles have huge relative surface features, their characteristics and chemical reactivity with neighboring compounds can be affected.

There has been no effective method for sorting and filtering nanoparticles based on their edges; hence such a procedure is in great demand.

The current study used cationic augmented monoliths for nanoparticle extraction and determination. Three distinct types of monoliths with various cationic architectures were employed, and their elution behavior was investigated.

Nanoparticles Implementation

As standard nanotechnology specimens, Doxil and exosomes were employed with average diameters of around 80 and 230 nm in the experimental fluids, correspondingly.

According to nanoparticle monitoring analyses, the zeta prospects of the Doxil and exosome nanomaterials were –3.8 and –4.1 mV, respectively. Doxil nanomaterials are considerably smaller and have a higher zeta potential than exosome nanoparticles.

NH2 Modified Monolith

The monolith was preconditioned with a 5 M Alkaline solution, water, and a 10 mM Tris buffer before analysis. At all pH levels, significant fluorescent was detected in two elution zones.

In each study, three NH2 transformed monoliths were employed to assess monolith to monolith repeatability. The pH tests were performed using all three monoliths simultaneously to ensure the identical centrifuged and temperature circumstances. #

Doxil was detected using the fluorescence characteristics of doxorubicin. Doxil is stable in high ionic strength solutions. When the pH was low (6 and 7) and the Tris percentage was less than 1,000 mM, Doxil was not eluted.

Under all pH settings, doxorubicin and albumin were barely held and eluted in the non-retained phase. In addition, some doxorubicin was recovered in the 10 mM Tris mixture. The team determined that Doxil can be isolated from doxorubicin and albumin-based on these findings. Doxil, unlike exosomes, does not engage electrostatic interactions with the NH2 members on the monolith surfaces.

Poly-Lys-modified Monolith

Under all pH settings, doxorubicin and albumin were hardly held and eluted in the non-retained fraction. Doxorubicin had a modest preference for poly-Lys-modified monoliths over NH2-modified monoliths. The foregoing results show that Doxil can be isolated and separated from free pharmaceuticals (doxorubicin, oligonucleotide) and substances in the blood (albumin) using a pH 6–8 eluent. Separating and purifying exosomes from oligonucleotides, on the other side, proved problematic.

Trimethylaminopropyl-modified Monolith

Doxorubicin and albumin were eluted in the non-retained fraction, although little was maintained under any pH settings.

As a result, it was determined that there are no circumstances under which nanomaterials are maintained by the trimethylaminopropyl-modified monolith and then solubilized when the ionic concentration increased; thus, isolating and cleansing nanomaterials from a solution that contains pharmacological agents (doxorubicin, oligonucleotide) and peptides (albumin) would be challenging using this monolith.

The poly-Lys-modified monolith was used to segregate doxorubicin and Doxil, and doxorubicin was virtually entirely removed from the nanoparticles. According to the researchers, the poly-Lys-modified monolith might be used to cleanse nanomedicines.

In summary, cation-modified monoliths were used to purify Doxil and exosome nanostructures. Further monolith elution investigations are likely to offer circumstances for isolating and refining nanoparticles with varying characteristics.

Continue reading: How Does Nanotechnology Improve Chromatographic Columns?


Kato, M. et al., (2022). A method for purifying nanoparticles using cationic modified monoliths and aqueous elution. Journal of Chromatography A. 462802. Available at:

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Ibtisam Abbasi

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Ibtisam Abbasi

Ibtisam graduated from the Institute of Space Technology, Islamabad with a B.S. in Aerospace Engineering. During his academic career, he has worked on several research projects and has successfully managed several co-curricular events such as the International World Space Week and the International Conference on Aerospace Engineering. Having won an English prose competition during his undergraduate degree, Ibtisam has always been keenly interested in research, writing, and editing. Soon after his graduation, he joined AzoNetwork as a freelancer to sharpen his skills. Ibtisam loves to travel, especially visiting the countryside. He has always been a sports fan and loves to watch tennis, soccer, and cricket. Born in Pakistan, Ibtisam one day hopes to travel all over the world.


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