Colorimetric Based Analysis Using Clustered Superparamagnetic Iron Oxide Nanoparticles for Enhanced Glucose Detection

  1. Wonseok ChoiORCID Logo and
  2. Jaehong KeyORCID Logo

Submitting author affiliation: Department of Biomedical Engineering, Yonsei University, Wonju, Korea, Republic of

Beilstein Arch. 2020, 2020104. https://doi.org/10.3762/bxiv.2020.104.v1

Published 14 Sep 2020

  • Preprint

Abstract

  Superparamagnetic iron oxide nanoparticles (SPIONs) are approved by the Food and Drug (FDA) in the United States. SPIONs are used in magnetic resonance imaging (MRI) as contrast agents and for target delivery in nanomedicine using external magnet sources. These can also act as an artificial peroxidase (i.e. nanozyme), and a reaction between SPIONs and peroxides was regarded as highly stable in various pH conditions and temperatures.

  In this study, we report a nanozyme ability of the clustered SPIONs (CSPIONs) coated with biocompatible poly(lactic-co-glycolic acid) (PLGA) and the results based on colorimetric changes. The synthesized CPSIONs had an average size of 120.1 nm, zeta-potential (ζ-potential) of -61.7 mV (n=3), and the clustered shape was identified by taking transmission electron microscopy images. We hypothesize that the CSPIONs can have more catalytic effects toward H2O2 than single SPIONs not clustered. As a result, CSPIONs were shown to oxidize a 2,2′-azino-bis(3-ethylbenzthiazoline-6-sulfonic acid) diammonium salt (ABTS) commonly used as a substrate for hydrogen peroxidase in the presence of H2O2, leading to a change the color of the substrate. We also utilized a colorimetric assay at 417 nm covering various glucose concentrations from 5 mM to 1.25 μM that considered the glucose condition of diabetes patients in physiological fluids. This study demonstrated that the absorbance value increases along with increasing the glucose level. It suggests that the particles can detect the glucose after SPIONs were clustered. The results were highly repeated at concentrations below 5 mM (standard deviations were presented as < 0.03). Moreover, the sensitivity and limit of detection (LOD) were 1.50 and 5.44 μM, respectively, indicating CSPIONs are more responsive to glucose compared to the SPIONs crystals.

  In conclusion, this study proposes that glucose can be detected more sensitive in vitro when SPIONs are clustered. The CSPIONs have the potential to be used for glucose detection in diabetic patients using a physiological fluid such as ocular, saliva, and urine.

Keywords: Iron Oxide Nanoparticles; Clustered Iron Oxide Nanoparticles; Artificial Peroxidase; Nanoenzyme; Colorimetric Detection

How to Cite

When a peer-reviewed version of this preprint is available, this information will be updated in the information box above. If no peer-reviewed version is available, please cite this preprint using the following information:

Choi, W.; Key, J. Beilstein Arch. 2020, 2020104. doi:10.3762/bxiv.2020.104.v1

Download Citation
Download RIS (Reference Manager) Download BIB (BIBTEX)

© 2020 Choi and Key; licensee Beilstein-Institut.
This is an Open Access article under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0). Please note that the reuse, redistribution and reproduction in particular requires that the authors and source are credited.
The license is subject to the Beilstein Archives terms and conditions: (https://www.beilstein-archives.org/xiv/terms)

Other Beilstein-Institut Open Science Activities

Logo
Logo
Logo
Symposia