Binding Studies of Cationic Conjugated Polymers and DNA for Label-Free Fluorescent Biosensors
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Bibliographic record
Abstract
Cationic conjugated polymers (CCPs), especially polythiophene, have been extensively used as probes for developing DNA and aptamer-based biosensors. Although many interesting applications have been achieved, a fundamental understanding of this system remains quite limited. In this work, we performed systematic binding assays to understand the interactions between poly(3-(3′-N,N,N-triethylamino-1′-propyloxy)-4-methyl-2,5-thiophene) (PMNT) and DNA. The fluorescence of PMNT at 530 nm initially decreased and then a peak at 580 nm emerged after binding with single-stranded DNA (ssDNA). The binding force between PMNT and DNA was dominated by electrostatic interactions at first and then DNA base-mediated interactions also became important. Since the bases in double-stranded DNA (dsDNA) were shielded, their fluorescence changes were quite different. To best differentiate ssDNA and dsDNA, the optimal pH was between 6 and 8, and the optimal NaCl concentration was around 0.3 M. Moreover, by changing the sequence and length of ssDNA, poly-T had the largest fluorescence shift and poly-A had the smallest change. Under the optimized conditions, the PMNT-based biosensor had a detection limit of 1 nM DNA, which was similar to the SYBR Green I-based assay.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it