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Author: search.filters.author.Chitkara, DeepakSubject: search.filters.subject.Nanotechnology

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    Can breakthroughs in dermal and transdermal macromolecule delivery surmount existing barriers and revolutionize future therapeutics?
    (Springer, 2025-05) Mittal, Anupama; Chitkara, Deepak
    The delivery of macromolecules through dermal and transdermal routes presents both significant challenges and transformative opportunities in therapeutic applications. This review highlights the most recent advancements and innovative strategies aimed at overcoming the barriers associated with macromolecular delivery. Cutting-edge approaches such as the use of adjuvants (e.g., hyaluronic acid-based and chemical penetration enhancers), bioactive peptides with diverse functionalities, and mechanical force techniques—including iontophoresis, microneedles, and electroporation—are thoroughly explored. While various strategies have been implemented to enhance skin delivery, they often present significant challenges, particularly for macromolecules. Addressing these challenges requires integrating novel technologies and understanding the interplay between biological barriers and delivery mechanisms. Furthermore, the role of nanotechnology, through systems like nanoemulsions, polymeric nanoparticles, and transferosomes, is examined for its ability to protect macromolecules and regulate their release. Notably, this review provides unique perspectives on the interplay between these strategies and their potential to revolutionise future therapeutics. By highlighting key trends and advancements in macromolecule delivery, this review underscores the importance of innovative approaches in overcoming existing barriers and enabling efficient drug administration.
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    Molecular medicines for cancer: concepts and applications of nanotechnology
    (CRC Press, 2019) Chitkara, Deepak; Mittal, Anupama
    The field of molecular medicine covers the medical interventions targeting molecular structures and mechanisms that are involved in disease progression. In cancer, several molecular mechanisms have been shown to impact its progression, aggressiveness and chemoresistance. Increasing evidence demonstrates the role of nanotechnology and outcome of molecular therapy. Several books have discussed molecular biology and mechanisms involved in cancer, but this text gives an account of molecular therapeutics in cancer relating to advancements of nanotechnology. It provides a description of the multidisciplinary field of molecular medicines and its targeted delivery to cancer using nanotechnology. Key Features: Provides current information in the multidisciplinary field of molecular medicines and its targeted delivery to cancer using nanotechnology Presents important aspects of nanotechnology in the site-specific delivery of anticancer agents Includes up to date information on oligonucleotide and gene based therapies in cancer Describes small targeted molecules, antibodies and oligonucleotides which have shown to selectively target the molecular structures thereby influencing signal transduction Facilitates discussion between researchers involved in cancer therapy and nanoscientists
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    A Rapid and Precise Liquid Chromatographic Method for Simultaneous Determination of Alpha Lipoic Acid and Docetaxel in Lipid-Based Nanoformulations
    (OUP, 2018-07) Chitkara, Deepak; Mittal, Anupama
    Combinational drug delivery successfully merges the benefits of nanotechnology and combination therapy by providing diversity to improve the carrier properties and better control over tailoring them as per the need of cancer treatment. A combination of conventional chemotherapeutic agent; docetaxel (DTX) and antioxidant agent; alpha lipoic acid (ALA) which acts by preventing metastasis may fulfill idealness of control and targeted drug delivery against breast cancer. The objective of the current study is to develop a reverse-phase HPLC-UV method for simultaneous determination of DTX and ALA in lipid-based nanoformulations. DTX and ALA were separated on Intersil® ODS (C18) column (250 × 4.6 mm, 5 μm) with a mobile phase consisting of acetonitrile: sodium acetate buffer (pH 3.5; 10 mM) (65:35% v/v) run in isocratic mode at a flow rate of 1 mL/min. The developed method was validated as per ICH guidelines. The method showed linearity in the concentration range of 1–15 μg/mL for DTX and 2–30 μg/mL for ALA. It can detect minimum 200 ng/mL of DTX and 500 ng/mL of ALA. The method was further successfully applied in lipid-based formulation characterization. In conclusion, a simple, accurate and precise reverse-phase HPLC-UV method was established for simultaneous determination of DTX and ALA in nanoformulations.
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    Chitosan-modified PLGA polymeric nanocarriers with better delivery potential for tamoxifen
    (Elsevier, 2016-12) Chitkara, Deepak
    Breast cancer is believed as the second most common cause of cancer-related deaths in women for which tamoxifen is frequently prescribed. Despite many promises, tamoxifen is associated with various challenges like low hydrophilicity, poor bioavailability and dose-dependent toxicity. Therefore, it was envisioned to develop tamoxifen- loaded chitosan-PLGA micelles for potential safe and better delivery of this promising agent. The chitosan-PLGA copolymer was synthesised and characterised by Fourier Transform-Infrared, Ultraviolet-visible and Nuclear Magnetic Resonance spectroscopic techniques. The drug-loaded nanocarrier was characterised for drug-pay load, micrometrics, surface charge and morphological attributes. The developed system was evaluated for in-vitro drug release, haemolytic profile, cellular-uptake, anticancer activity by cytotoxicity assay and dermatokinetic studies. The developed nano-system was able to substantially load the drug and control the drug release. The in-vitro cytotoxicity offered by the system was significantly enhanced vis-a-vis plain drug, and there was no substantial haemolysis. The IC50 values were significantly decreased and the nanocarriers were uptaken by MCF-7 cells, noticeably. The carrier was able to locate the drug in the interiors of rat skin in considerable amounts to that of the conventional product. This approach is promising as it provides a biocompatible and effective option for better delivery of tamoxifen.