Abstract
Serotonin (5-HT) levels have been associated with several exclusively metabolic disorders. Herein, a new approach for 5-HT level as a novel biomarker of diabetes mellitus is considered using a simple nanocomposite and HPLC method. Reduced graphene oxide (rGO) comprising gold nanoparticles (AuNPs) was decorated with 18-crown-6 (18.Cr.6) to fabricate a simple nanocomposite (rGO-AuNPs-18.Cr.6). The nanocomposite was positioned on a glassy carbon electrode (GCE) to form an electrochemical sensor for the biomarker 5-HT in the presence of L-tryptophan (L-Trp), dopamine (DA), ascorbic acid (AA), urea, and glucose. The nanocomposite exhibited efficient catalytic activity for 5-HT detection by square-wave voltammetry (SWV). The proposed sensor displayed high selectivity, excellent reproducibility, notable anti-interference ability, and long-term stability even after 2 months. SWV defined a linear range of 5-HT concentration from 0.4 to 10 μg L−1. A diabetic animal model (diabetic zebrafish model) was then applied to investigate 5-HT as a novel biomarker of diabetes. A limit of detection (LOD) of about 0.33 μg L−1 was found for the diabetic group and 0.15 μg L−1 for the control group. The average levels of 5-HT obtained were 9 and 2 μg L−1 for control and diabetic groups, respectively. The recovery, relative standard deviation (RSD), and relative error (RE) were found to be about 97%, less than 2%, and around 3%, respectively. The significant reduction in 5-HT level in the diabetic group compared to the control group proved that the biomarker 5-HT can be applied for the early diagnosis of diabetes mellitus.
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Acknowledgments
This work was supported by the Endocrinology and Metabolism Research Institute, Tehran University of Medical Sciences (Grant No. 1396-01-100-2249). The authors would like to express special thanks to Dr. Farshad Sharifi for his valuable insight.
Authorship contribution statement
K. Khoshnevisan: conceptualization, formal analysis, investigation, methodology, resources, design, software, validation, visualization, writing original draft, writing/review and editing. H. Baharifar: data curation, investigation, methodology, resources, software, validation, visualization, writing original draft. F. Torabi: data curation, software, investigation, validation, resources. M. Sadeghi Afjeh: investigation, data curation, methodology, resources, validation, software. H. Maleki: data curation, design, software, investigation. E. Honarvarfard: investigation, writing/review and editing, software, design. H. Mohammadi: formal analysis, resources, investigation. SM. Sajjadi-Jazi: investigation, data curation, resources, writing original draft. S. Mahmoudi-Kohan: investigation, data curation, software. F. Faridbod: conceptualization, supervision, investigation, resources, visualization. B. Larijani: funding acquisition, project administration, resources, supervision. FS: investigation, conceptualization, visualization. R. Faridi Majidi: investigation, visualization, conceptualization. M.R. Khorramizadeh: conceptualization, funding acquisition, investigation, project administration, resources, supervision, visualization, writing/review and editing.
Funding
This study was financially supported by the Iran National Committee for Medical Research Development (NIMAD), Tehran, Iran (Grant No. 971040).
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Khoshnevisan, K., Baharifar, H., Torabi, F. et al. Serotonin level as a potent diabetes biomarker based on electrochemical sensing: a new approach in a zebra fish model. Anal Bioanal Chem 413, 1615–1627 (2021). https://doi.org/10.1007/s00216-020-03122-5
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DOI: https://doi.org/10.1007/s00216-020-03122-5