Fabrication Of Bilayer Nanofibers From Poly Xylitol Dodecanedioic Acid, Poly Caprolactone, Gelatin Biological Macromolecules And Surface Modification Via Spin Coating Of Capsules For Skin Wound Treatment
Pith reviewed 2026-06-26 11:24 UTC · model grok-4.3
The pith
Bilayer PXDDA-gelatin-PCL nanofibers with drug-loaded capsules release antibiotic via Higuchi kinetics and raise cell viability in lab tests.
A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.
Core claim
The authors produced stable bilayer nanofibers by electrospinning 15 percent PXDDA, 15 percent gelatin, and 20 percent PCL solutions at 15 kV and 0.5 ml per hour, then placed clindamycin-loaded nitrogen-doped activated carbon nanoparticles between the layers by spin coating. The resulting material showed contact angle and swelling that increased with capsule concentration, drug release obeying Higuchi kinetics, and in-vitro results of biodegradability, antibacterial efficacy, and improved cell viability relative to the control.
What carries the argument
The bilayer nanofiber scaffold formed by electrospinning PXDDA/gelatin/PCL layers with spin-coated clindamycin-loaded nitrogen-doped activated carbon nanoparticles placed between them.
If this is right
- Drug release follows the Higuchi model with high correlation coefficients.
- Increasing capsule concentration raises both contact angle and swelling over 12 hours.
- Optimizing drug concentration improves cell attachment and viability in MTT assays.
- The nanofiber diameter of 271 nm aligns with predictions from an ANN model at cost 0.0054 and R of 0.99.
- The scaffold demonstrates biodegradability and antibacterial efficacy in laboratory tests.
Where Pith is reading between the lines
- The same electrospinning and spin-coating sequence could be tested with other antibiotics or growth factors.
- The ANN optimization step for fiber diameter might be applied to different polymer blends.
- Direct comparison of wound-closure rates against commercial dressings would clarify relative performance.
- Long-term stability after crosslinking could be checked by measuring mechanical properties over weeks.
Load-bearing premise
The in-vitro antibacterial and cell-viability results will translate directly to functional wound healing in tissue without further in-vivo validation.
What would settle it
An animal wound-closure experiment in which the scaffold produces no measurable reduction in healing time or infection rate compared with an untreated control would falsify the claim of utility for skin wound treatment.
read the original abstract
In this study, poly xylitol dodecanedioic acid was synthesized from xylitol and dodecanedioic acid monomers in a 1:1 molar ratio with Mw = 4038 g/mol using the polycondensation method. bilayer nanofibers with optimal morphology and average diameter of 271 70 nm were fabricated using electrospinning in voltage of 15 kV and flow rate of 0.5 ml/h, incorporating 15% PXDDA, 15% gelatin, and 20% poly caprolactone polymer solutions. this diameter of nanofibers was perfectly aligned with genetic algorithm in ANN model with a cost value of 0.0054 and R = 0.99 rather than RSM model. to enhance the stability of the electrospun nanofibers, glutaraldehyde was employed as a crosslinking agent. additionally, nitrogen doped activated carbon nanoparticles served as carriers for clindamycin, intended for spin coating between the layers of PXDDA/Gel/PCL nanofibers. Results indicated that an increase in capsule concentration enhanced bilayer nanofiber contact angle while swelling percentage progressively increased in optimal point of CD concentration over 12 hours. furthermore, drug release followed higuchi kinetics, exhibiting high correlation values for the best-fit model. biodegradability, antibacterial efficacy, cell culture assessments, and MTT assay demonstrated optimizing drug concentration improved cell attachment and viability compared to the control sample.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The manuscript reports synthesis of poly(xylitol dodecanedioic acid) (PXDDA, Mw=4038 g/mol) via polycondensation, electrospinning of bilayer PXDDA/gelatin/PCL nanofibers (15/15/20 wt%, 15 kV, 0.5 ml/h) optimized by ANN (R=0.99) over RSM, spin-coating of N-doped carbon capsules loaded with clindamycin between layers, glutaraldehyde crosslinking, and in-vitro results showing Higuchi drug release, concentration-dependent swelling/contact angle, biodegradability, antibacterial activity, and improved MTT cell viability/attachment versus control, positioning the construct for skin wound treatment.
Significance. If the in-vitro metrics prove statistically robust and the scaffold performs under physiological conditions, the work would introduce a biodegradable bilayer nanofiber platform combining synthetic/natural polymers with nanoparticle-mediated antibiotic delivery, potentially advancing controlled-release wound dressings; however, the current absence of quantitative data and in-vivo evidence limits immediate impact.
major comments (4)
- [Abstract] Abstract: the claim of ANN optimization yielding R=0.99 and cost=0.0054 with 'perfect alignment' of 271 nm diameter is unsupported by any model equations, training data, validation procedure, or comparison metrics beyond the single R value, rendering the optimization step unverifiable.
- [Abstract] Abstract/Results: positive outcomes for MTT assay, antibacterial efficacy, cell attachment, and Higuchi fit (high correlation) are stated without raw data, error bars, replicate numbers (n), statistical tests, or controls, directly undermining the soundness of the 'improved viability' and 'optimizing drug concentration' conclusions.
- [Abstract] Abstract/Discussion: the positioning for 'skin wound treatment' rests on in-vitro assays alone (Higuchi release, MTT, antibacterial, biodegradability) with no in-vivo animal model, mechanical testing under load, immune-response data, or comparison to commercial dressings, making the translational claim load-bearing yet unsupported.
- [Methods] Methods: glutaraldehyde crosslinking is used for stability but no cytotoxicity controls, residual GA quantification, or comparison of crosslinked vs. uncrosslinked scaffolds in the cell assays are described, leaving open the possibility that observed viability changes are confounded by crosslinking chemistry.
minor comments (2)
- [Abstract] Abstract contains multiple typographical issues: '271 70 nm' (missing ±), inconsistent capitalization ('poly Xylitol', 'Poly Caprolactone'), run-on sentences, and grammatical errors that reduce readability.
- [Abstract] No figure or table references are provided in the abstract for SEM morphology, release curves, or MTT data, making it difficult to locate supporting visuals.
Simulated Author's Rebuttal
We thank the referee for the constructive and detailed comments on our manuscript. We have addressed each major comment point by point below, revising the manuscript where feasible to enhance verifiability, clarity, and caution in claims while remaining faithful to the in-vitro scope of the work.
read point-by-point responses
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Referee: [Abstract] Abstract: the claim of ANN optimization yielding R=0.99 and cost=0.0054 with 'perfect alignment' of 271 nm diameter is unsupported by any model equations, training data, validation procedure, or comparison metrics beyond the single R value, rendering the optimization step unverifiable.
Authors: We agree the abstract is too concise on this point. The full manuscript details the ANN architecture, genetic algorithm parameters, training dataset (electrospinning voltage, flow rate, and polymer concentrations), validation procedure, and direct comparison to RSM in the Methods and supplementary information. We will revise the abstract to include a brief reference to these elements and the cost function to improve verifiability without exceeding length limits. revision: yes
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Referee: [Abstract] Abstract/Results: positive outcomes for MTT assay, antibacterial efficacy, cell attachment, and Higuchi fit (high correlation) are stated without raw data, error bars, replicate numbers (n), statistical tests, or controls, directly undermining the soundness of the 'improved viability' and 'optimizing drug concentration' conclusions.
Authors: The full manuscript presents these outcomes with supporting figures that include error bars, replicate numbers (n=3), and statistical tests (e.g., ANOVA). The abstract's brevity precludes full reporting of raw values. We will revise the abstract to note 'statistically significant improvements (p<0.05, n=3)' and ensure the results section explicitly describes controls and the Higuchi model fitting procedure. revision: partial
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Referee: [Abstract] Abstract/Discussion: the positioning for 'skin wound treatment' rests on in-vitro assays alone (Higuchi release, MTT, antibacterial, biodegradability) with no in-vivo animal model, mechanical testing under load, immune-response data, or comparison to commercial dressings, making the translational claim load-bearing yet unsupported.
Authors: We concur that the work is strictly in-vitro and that stronger translational language requires additional data. We have revised the abstract and discussion to state that the bilayer construct 'demonstrates potential' for skin wound treatment based on the reported in-vitro metrics, while explicitly noting the absence of in-vivo, mechanical, and immune data and the need for future studies including comparisons to commercial dressings. revision: yes
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Referee: [Methods] Methods: glutaraldehyde crosslinking is used for stability but no cytotoxicity controls, residual GA quantification, or comparison of crosslinked vs. uncrosslinked scaffolds in the cell assays are described, leaving open the possibility that observed viability changes are confounded by crosslinking chemistry.
Authors: This is a valid concern. We will add to the Methods section the protocol for residual glutaraldehyde quantification, cytotoxicity assays of the crosslinking agent alone, and direct comparisons of cell viability and attachment on crosslinked versus uncrosslinked scaffolds to rule out confounding effects. revision: yes
Circularity Check
No circularity: purely experimental fabrication and characterization study
full rationale
The paper reports polymer synthesis via polycondensation, electrospinning of PXDDA/Gel/PCL bilayer nanofibers at fixed parameters (15 kV, 0.5 ml/h), glutaraldehyde crosslinking, capsule spin-coating for drug delivery, and subsequent in-vitro tests (Higuchi release, swelling, antibacterial activity, MTT viability). The sole modeling element is an ANN-GA fit reported to yield R=0.99 agreement with the measured 271 nm diameter; this is presented as post-experiment alignment rather than a derivation in which any central claim (e.g., therapeutic utility) is defined by or reduces to the same fitted values. No self-definitional equations, fitted inputs renamed as predictions, or load-bearing self-citations appear. The work is self-contained experimental description.
Axiom & Free-Parameter Ledger
free parameters (2)
- Polymer concentrations (15% PXDDA, 15% Gel, 20% PCL)
- Electrospinning voltage and flow rate (15 kV, 0.5 ml/h)
axioms (2)
- domain assumption Glutaraldehyde crosslinking renders the nanofibers stable in aqueous environments without cytotoxicity at the concentrations used.
- domain assumption Higuchi model is an appropriate description of release from the capsule-loaded bilayer system.
Reference graph
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Introduction The skin is the largest organ in the human body, composed of multiple layers, including the epidermis, dermis, and hypodermis. While the epidermis serves as the outermost protective layer, shielding the skin from chemical, physical, and biological damage, the dermis, as the second layer, plays a vital role in improving skin function. Through ...
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Materials Xylitol and Dodecanedioic acid monomers (high-purity) were prepared from Sigma Aldrich
Experimental 2.1. Materials Xylitol and Dodecanedioic acid monomers (high-purity) were prepared from Sigma Aldrich. Poly (Ɛ- caprolactone) (PCL) polymer with molecular weights of 8 0000 Da, carboxymethyl cellulose (CMC) with an average molecular weight of 250,000, urea , Hydrochloric acid (HCL) , and glutaraldehyde (GA) were purchased from Sigma Aldrich c...
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The optical density (OD) of the suspension was adjusted to McFarland 0.5 (10⁷ CFU/mL) with an absorbance range of 0.08 – 0.10 at 600 nm
To prepare a 1.5 × 10⁵ CFU/mL bacterial suspension, a portion of microorganism colonies was transferred into a test tube containing Tryptic Soy Broth (TSB). The optical density (OD) of the suspension was adjusted to McFarland 0.5 (10⁷ CFU/mL) with an absorbance range of 0.08 – 0.10 at 600 nm. Samples were cut into circular discs (48 ± 1 mm in diameter) an...
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Characterization of PXDDA Polymer 3.1.1
Results and Discussion 3.1. Characterization of PXDDA Polymer 3.1.1. Molecular Weight of PXDDA Polymer Gel Permeation Chromatography (GPC) is a widely used technique for determining polymer molecular weight, which significantly influences polymer properties. In this method, polymer molecules are separated based on their size to calculate the weight -avera...
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The results confirmed that PXDDA polymer and its nanofibers exhibit autofluorescence within the wavelength range of 420 –720 nm
Conclusion This study characterized the synthesis of poly(xylitol dodecanedioic acid) (PXDDA) polymer with a molecular weight of 4038 g/mol, derived from xylitol and dodecanedioic acid (DDA) monomers via polycondensation reaction. The results confirmed that PXDDA polymer and its nanofibers exhibit autofluorescence within the wavelength range of 420 –720 n...
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discussion (0)
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