Electrochemical Impedance Immunoassay for ALS-Associated Neurofilament Protein: Matrix Effect on the Immunoplatform
Amyotrophic Lateral Sclerosis (ALS) is a neurodegenerative disorder, which has complex diagnostic steps. Electrochemical immunoassays may make the diagnosis simpler and faster. Here, we present the detection of ALS-associated neurofilament light chain (Nf-L) protein through an electrochemical impeda...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-02-01
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| Series: | Biosensors |
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| Online Access: | https://www.mdpi.com/2079-6374/13/2/247 |
| _version_ | 1797622098114379776 |
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| author | Omair Adil Mohtashim H. Shamsi |
| author_facet | Omair Adil Mohtashim H. Shamsi |
| author_sort | Omair Adil |
| collection | DOAJ |
| description | Amyotrophic Lateral Sclerosis (ALS) is a neurodegenerative disorder, which has complex diagnostic steps. Electrochemical immunoassays may make the diagnosis simpler and faster. Here, we present the detection of ALS-associated neurofilament light chain (Nf-L) protein through an electrochemical impedance immunoassay on reduced graphene oxide (rGO) screen-printed electrodes. The immunoassay was developed in two different media, i.e., buffer and human serum, to compare the effect of the media on their figures of merit and calibration models. The label-free charge transfer resistance (R<sub>CT</sub>) of the immunoplatform was used as a signal response to develop the calibration models. We found that exposure of the biorecognition layer to human serum improved the impedance response of the biorecognition element with significantly lower relative error. Moreover, the calibration model obtained in the human serum environment has higher sensitivity and a better limit of detection (0.087 ng/mL) than the buffer medium (0.39 ng/mL). The analyses of the ALS patient samples show that concentrations obtained from the buffer-based regression model was higher than the serum-based model. However, a high Pearson correlation (r = 1.00) between the media suggests that concentration in one medium may be useful to predict the concentration in the other medium. Moreover, the Nf-L concentration appears to increase with age in both male and female groups, while overall higher Nf-L was found in the male group than the female group. |
| first_indexed | 2024-03-11T09:05:26Z |
| format | Article |
| id | doaj.art-e6f4eac5c26d4e0ba0b0cfc82b23b744 |
| institution | Directory Open Access Journal |
| issn | 2079-6374 |
| language | English |
| last_indexed | 2024-03-11T09:05:26Z |
| publishDate | 2023-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Biosensors |
| spelling | doaj.art-e6f4eac5c26d4e0ba0b0cfc82b23b7442023-11-16T19:26:11ZengMDPI AGBiosensors2079-63742023-02-0113224710.3390/bios13020247Electrochemical Impedance Immunoassay for ALS-Associated Neurofilament Protein: Matrix Effect on the ImmunoplatformOmair Adil0Mohtashim H. Shamsi1School of Chemical and Biomolecular Sciences, Southern Illinois University, 1245 Lincoln Drive, Carbondale, IL 62918, USASchool of Chemical and Biomolecular Sciences, Southern Illinois University, 1245 Lincoln Drive, Carbondale, IL 62918, USAAmyotrophic Lateral Sclerosis (ALS) is a neurodegenerative disorder, which has complex diagnostic steps. Electrochemical immunoassays may make the diagnosis simpler and faster. Here, we present the detection of ALS-associated neurofilament light chain (Nf-L) protein through an electrochemical impedance immunoassay on reduced graphene oxide (rGO) screen-printed electrodes. The immunoassay was developed in two different media, i.e., buffer and human serum, to compare the effect of the media on their figures of merit and calibration models. The label-free charge transfer resistance (R<sub>CT</sub>) of the immunoplatform was used as a signal response to develop the calibration models. We found that exposure of the biorecognition layer to human serum improved the impedance response of the biorecognition element with significantly lower relative error. Moreover, the calibration model obtained in the human serum environment has higher sensitivity and a better limit of detection (0.087 ng/mL) than the buffer medium (0.39 ng/mL). The analyses of the ALS patient samples show that concentrations obtained from the buffer-based regression model was higher than the serum-based model. However, a high Pearson correlation (r = 1.00) between the media suggests that concentration in one medium may be useful to predict the concentration in the other medium. Moreover, the Nf-L concentration appears to increase with age in both male and female groups, while overall higher Nf-L was found in the male group than the female group.https://www.mdpi.com/2079-6374/13/2/247amyotrophic lateral sclerosisneurofilament-lightelectrochemical impedance spectroscopyimmunoassaydiagnostics |
| spellingShingle | Omair Adil Mohtashim H. Shamsi Electrochemical Impedance Immunoassay for ALS-Associated Neurofilament Protein: Matrix Effect on the Immunoplatform Biosensors amyotrophic lateral sclerosis neurofilament-light electrochemical impedance spectroscopy immunoassay diagnostics |
| title | Electrochemical Impedance Immunoassay for ALS-Associated Neurofilament Protein: Matrix Effect on the Immunoplatform |
| title_full | Electrochemical Impedance Immunoassay for ALS-Associated Neurofilament Protein: Matrix Effect on the Immunoplatform |
| title_fullStr | Electrochemical Impedance Immunoassay for ALS-Associated Neurofilament Protein: Matrix Effect on the Immunoplatform |
| title_full_unstemmed | Electrochemical Impedance Immunoassay for ALS-Associated Neurofilament Protein: Matrix Effect on the Immunoplatform |
| title_short | Electrochemical Impedance Immunoassay for ALS-Associated Neurofilament Protein: Matrix Effect on the Immunoplatform |
| title_sort | electrochemical impedance immunoassay for als associated neurofilament protein matrix effect on the immunoplatform |
| topic | amyotrophic lateral sclerosis neurofilament-light electrochemical impedance spectroscopy immunoassay diagnostics |
| url | https://www.mdpi.com/2079-6374/13/2/247 |
| work_keys_str_mv | AT omairadil electrochemicalimpedanceimmunoassayforalsassociatedneurofilamentproteinmatrixeffectontheimmunoplatform AT mohtashimhshamsi electrochemicalimpedanceimmunoassayforalsassociatedneurofilamentproteinmatrixeffectontheimmunoplatform |