Recent Advances in Intrinsically Fluorescent Polydopamine Materials
Open accessAbstract
Fluorescence nanoparticles have gained much attention due to their unique properties in the sensing and imaging fields. Among the very successful candidates are fluorescent polydopamine (FPDA) nanoparticles, attributed to their simplicity in tracing and excellent biocompatibility. This article aims to highlight the recent achievements in FPDA materials, especially on the part of luminescence mechanisms. We focus on the intrinsic fluorescence of PDA and will not discuss fluorescent reaction with a fluorometric reagent or coupling reaction with a fluorophore, which may cause more in vivo interferences. We believe that intrinsic FPDA presents great potential in bioapplications.
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PDA itself possesses reversible redox activity.
“Second, PDA itself possesses reversible redox activity.”
From Polydopamine-Based Biomaterials in Oral Medicine: Applications, Mechanisms, and Translational Challenges (2026) · cites this paper as [11]
The Introduction describes oxidation of catecholamine units in PDA, supporting that PDA can undergo redox-related reactions. Neither that passage nor the discussion of dopamine oxidation in §2.1 establishes that PDA itself has reversible redox activity; reversibility is the unsupported part. (LLM, conf=0.83)
Experimental — accuracy not yet measuredCareful control of PDA film thickness within 5-8 nm allows effective surface adhesion to be retained while preserving a favorable conductive window for signal transduction.
“As a result, careful control of the film thickness within the range of 5–8 nm allows effective surface adhesion to be retained while preserving a favorable conductive window for signal transduction.11”
From Polydopamine-Based Biomaterials in Oral Medicine: Applications, Mechanisms, and Translational Challenges (2026) · cites this paper as [11]
Section 3.5, “Other Applications” (page not provided), describes polydopamine-based materials as adhesive and conductive. It does not establish a 5–8 nm film-thickness range or show that this range preserves adhesion and a conductive window for signal transduction. (LLM, conf=0.83)
Experimental — accuracy not yet measuredThese requirements remain among the most critical translational hurdles that must be addressed before widespread clinical adoption of PDA-based coatings can be realized.
“These requirements remain among the most critical translational hurdles that must be addressed before widespread clinical adoption can be realized.11,107”
From Polydopamine-Based Biomaterials in Oral Medicine: Applications, Mechanisms, and Translational Challenges (2026) · cites this paper as [11]
The Conclusions (page not provided) identify important challenges for future applications of intrinsically fluorescent PDA, including clarifying its structure and assessing long-term in vivo effects. The paper does not characterize these as the most critical hurdles to widespread clinical adoption of PDA-based coatings; its discussion concerns fluorescent PDA for sensing and bioimaging. (LLM, conf=0.83)
Experimental — accuracy not yet measuredPDA closely resembles natural melanin, giving it broadband optical absorption from the ultraviolet to the near-infrared region and photothermal conversion capability.
“Structurally, PDA closely resembles natural melanin, endowing it with broadband optical absorption spanning from the ultraviolet to the near-infrared (NIR) region.”
From Polydopamine-Based Biomaterials in Oral Medicine: Applications, Mechanisms, and Translational Challenges (2026) · cites this paper as [11]
The apparent heterogeneous electron transfer rate constant (k0) decreases exponentially with increasing PDA film thickness.
“Notably, the apparent heterogeneous electron transfer rate constant (k0) decreases exponentially with increasing PDA film thickness.”
From Polydopamine-Based Biomaterials in Oral Medicine: Applications, Mechanisms, and Translational Challenges (2026) · cites this paper as [11]
Our copy discusses fluorescent PDA properties and sensors, but the passages found do not address electron-transfer rates through PDA films. Searches for the apparent heterogeneous electron-transfer rate constant, film thickness, and an exponential relationship found no supporting passage. (LLM, conf=0.75)
Experimental — accuracy not yet measured
Electrochemical characterization reveals a pair of broad redox peaks within the potential window of 0.2-0.6 V versus Ag/AgCl, corresponding to an apparent electron transfer number of approximately n ≈ 2.
“Electrochemical characterization reveals a pair of broad redox peaks within the potential window of 0.2–0.6 V versus Ag/AgCl, corresponding to an apparent electron transfer number of approximately n ≈ 2.”
From Polydopamine-Based Biomaterials in Oral Medicine: Applications, Mechanisms, and Translational Challenges (2026) · cites this paper as [11]
The Redshift Phenomenon section discusses one-electron oxidation of dopamine, but not electrochemical redox peaks. Searches for the 0.2–0.6 V window, Ag/AgCl reference, cyclic voltammetry, and an apparent electron-transfer number of approximately two found no passage addressing the claimed characterization. (LLM, conf=0.76)
Experimental — accuracy not yet measuredThis trial is designed to assess the 6-month osseointegration performance of PDA-coated titanium screws in 20 patients with tooth loss, using an implant stability quotient greater than 70 as the primary endpoint, and is expected to conclude in 2025.
“This trial is designed to assess the 6-month osseointegration performance of PDA-coated titanium screws in 20 patients with tooth loss, using an implant stability quotient (ISQ) greater than 70 as the primary endpoint, and is expected to conclude in 2025.”
From Polydopamine-Based Biomaterials in Oral Medicine: Applications, Mechanisms, and Translational Challenges (2026) · cites this paper as [11]
Split into 2 atoms — 0 confirmed, 0 partially supported, 0 disputed, 0 misattributed, 2 unverifiable. Expand the claim to see per-atom verdicts.
Experimental — accuracy not yet measuredThe US FDA classifies PDA as a 'novel coating' rather than a simple physical modification, thereby necessitating the submission of a comprehensive biological evaluation package in accordance with ISO 10993, as well as GLP-compliant large-animal safety studies and evidence from clinical randomized controlled trials.
“The US Food and Drug Administration (FDA) classifies PDA as a “novel coating” rather than a simple physical modification, thereby necessitating the submission of a comprehensive biological evaluation package in accordance with ISO 10993, as well as GLP-compliant large-animal safety studies and evidence from clinical randomized controlled trials (RCTs).”
From Polydopamine-Based Biomaterials in Oral Medicine: Applications, Mechanisms, and Translational Challenges (2026) · cites this paper as [11]
Split into 2 atoms — 0 confirmed, 0 partially supported, 0 disputed, 0 misattributed, 2 unverifiable. Expand the claim to see per-atom verdicts.
Experimental — accuracy not yet measuredAt present, only one early-stage clinical study registered on ClinicalTrials.gov (NCT04893212) has been reported.
“At present, only one early-stage clinical study registered on ClinicalTrials.gov (NCT04893212) has been reported.”
From Polydopamine-Based Biomaterials in Oral Medicine: Applications, Mechanisms, and Translational Challenges (2026) · cites this paper as [11]
The Conclusions discuss the need to study long-term in vivo effects of fluorescent polydopamine, but do not report a clinical study. Searches for NCT04893212 and for an early-stage study registered on ClinicalTrials.gov found no passage addressing the claim in our copy. (LLM, conf=0.74)
Experimental — accuracy not yet measured
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- Authors
- Su, H., & Zhao, F.
- Affiliations
- Tianjin University (CN)
- Corresponding author
- Zhao, Fei
- Venue
- Applied Sciences
- Publisher
- MDPI AG
- Published
- 2022-04-30
- Volume
- 12
- Issue
- 9
- Pages
- 4560
- ISSN
- 2076-3417 (ISSN-L)
- OpenAlex
- W4225260646
- Cited by
- 10
- References
- 120
- Citations by year
- 2025: 4 · 2023: 4 · 2022: 2
- FWCI
- 0.70
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- Locations
- Applied Sciences (publishedVersion, cc-by)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- Funders
- National Natural Science Foundation of China (grant number 21904096)
- Topics
- Physical Sciences › Materials Science › Materials Chemistry › Luminescence and Fluorescent Materials
- Physical Sciences › Materials Science › Materials Chemistry › Carbon and Quantum Dots Applications
- Physical Sciences › Materials Science › Surfaces, Coatings and Films › Polymer Surface Interaction Studies
- Keywords
- polydopamine, intrinsic fluorescence, luminescence mechanism, bioimaging, biosensing, biocompatibility, fluorescent nanoparticles
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