Browsing by Author "None Darshna"

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A Layer-by-Layer Polycaprolactone/Chitosan-Based Biomimetic Hybrid Nanofibroporous Scaffold for Enhanced Skin Tissue Regeneration: Integrating Solution Blow Spinning and Freeze Casting Techniques
(American Chemical Society, 2025) Divakar Singh; None Darshna; Pradeep Kumar Srivastava
Nanofibers, with their high surface area-to-volume ratio, elasticity, and mechanical strength, significantly enhance scaffold structures for skin tissue engineering. The present study introduces a unique method of combining solution blow spinning (SBS) and freeze casting to fabricate biomimetic hybrid nanofibroporous scaffolds (BHNS) using polycaprolactone (PCL) and chitosan (CH). The developed scaffolds mimic the fibrous porous natural extracellular matrix (ECM) architecture, promoting cell adhesion, proliferation, and matrix deposition. The combined SBS and freeze-casting processes resulted in scaffolds with high porosity and optimal mechanical strength, crucial for effective skin regeneration. Scanning electron microscopy (SEM) confirmed the uniform, nonwoven, and beadless architecture of the PCL fibers and the fibroporous nature of the PCL/CH scaffolds. The scaffolds exhibited excellent swelling behavior, controlled degradation rates, and enhanced mechanical properties. In vitro cell studies demonstrated scaffold cell-supportive properties in terms of cell attachment, proliferation, and migration. This innovative layer-by-layer fabrication technique, integrating nanofibers with freeze-cast scaffolds, represents a significant advancement in skin tissue engineering, promising improved outcomes in wound healing and regenerative medicine. © 2024 American Chemical Society.
Clinically Deployable Electro-Immunosensing Device Comprising Bioactive Glass-MWCNT for Alkaline Phosphatase Detection in Human Serum Samples
(American Chemical Society, 2025) None Darshna; Indrani Nandi; Pradeep Kumar Srivastava; Pranjal Chandra
Bone is a dynamic tissue that serves several purposes in the human body, including storing calcium, forming blood cells, and protecting and supporting the body’s organs. Alkaline phosphatase (ALP) is secreted into the circulation by osteoblasts, the cells responsible for making bone. It attaches to the surface of osteoblast cells or matrix vesicles. Accordingly, ALP is present in serum and is a popular biomarker for the evaluation of bone disease and other disorders in clinical evaluations. In this study, a composite probe made of bioactive glass (BG) and multiwalled carbon nanotubes (MWCNT) was used to detect ALP through electrochemical impedance spectroscopy (EIS) without the need for labels. By combination of physical methods with electrochemical analysis, the biosensor probe was characterized. The analytical performance of the biosensor was evaluated using EIS, and the results revealed that it has a limit of detection (LOD) of 2.29 ± 0.35 U/L and a linear dynamic range (LDR) of 25-600 U/L; both of which are within the acceptable range for ALP detection in clinics. When tested against serum interfering chemicals, the biosensor probe that was designed shows a strong selectivity for ALP (Ksel < 0.06). In addition, human serum and fetal bovine serum were used to test the system’s ability to detect ALP in biological samples. © 2025 American Chemical Society.
Label-Free Bioelectronic Impedimetric Immunosensing Device for Alkaline Phosphatase Detection Using Graphene Oxide and Chitosan-Silk Fibroin-Polycaprolactone-Hydroxyapatite-Based Hybrid
(American Chemical Society, 2024) None Darshna; Daphika S Dkhar; Pradeep Srivastava; Pranjal Chandra
Bone, a dynamic tissue with diverse functions in the human body, plays vital roles, such as providing structural support and protection to organs, serving as the site for blood cell formation, and acting as the primary storage site for calcium. Osteoblasts, bone-forming cells, express alkaline phosphatase (ALP), which binds to the cell surface or matrix vesicles and can be released into the bloodstream. Consequently, ALP can be found in the serum and is commonly used as a biomarker in clinical studies to assess conditions related to bone diseases as well as other disorders. This study presents a label-free approach for detecting ALP using electrochemical impedance spectroscopy (EIS) using a composite probe consisting of graphene oxide (GO) and chitosan (Ch)-silk fibroin (SF)-polycaprolactone (PCL)-hydroxyapatite (HAp) matrix. The GO and composite Ch-SF-PCL-HAp matrix are sequentially deposited on the glassy carbon electrode and further immobilized with anti-ALP antibodies. The biosensor probe is characterized using physical techniques and electrochemical analysis. The biosensor’s analytical performance is assessed using EIS, and it shows a limit of detection of 1.74 (±0.26) U/L with a linear dynamic range of 30-500 U/L, which falls well within the clinical range of ALP detection. The developed biosensor probe exhibits high selectivity for ALP (ksel < 0.04) when tested against interfering molecules in serum. Furthermore, the system is tested with fetal bovine serum and human serum to detect ALP in biological samples. © 2024 American Chemical Society.