title: Characterization and scanning electron microscopic investigation of crosslinked freeze dried gelatin matrices for study of drug diffusivity and release kinetics.
abstract: Drug delivery is a promising technique to enhance the therapeutic efficacy of the drug. However, properties of carrier materials require intense improvement for effective transport of drug molecules. In the current study, attempts have been made to develop freeze dried gelatin matrices cross linked with genipin at various temperatures (5°C, 15°C and 25°C) prior to freeze-drying (-80°C). The freeze dried matrices thus obtained at the said temperatures are characterized for crosslinking density, compression strength, swelling behaviors. The matrix crosslinked at 25°C showed highest Flory-Rehner crosslinking density (467 ± 46) (p<0.05), highest compressive strength (12.36 ± 0.12) (p<0.05) and lowest equilibrium water content. In this context, scanning electron microscopy (SEM) was performed to study the surface morphology (size and shape of pores) of the crosslinked matrices. These images were further processed for quantitative analysis of morphological features, viz., areas, radius, ferret diameter, length of major and minor axis and eccentricity using MATLAB toolboxes. These quantitative analyses correlate transport and the release kinetics of model anti-inflammatory drug (indomethacin) from crosslinked matrices in vitro to tune as a controllable delivery system. The diffusional exponent (n) for all constructs ranging from 0.61 to 0.69 (p<0.05) (0.45<n<0.89) indicated non-Fickian release kinetics.
authors.affiliation: School of Medical Science and Technology, Indian Institute of Technology Kharagpur, Kharagpur 721302, India.
authors.forename: Goutam
authors.initials: G
authors.lastname: Thakur
authors.forename: Analava
authors.initials: A
authors.lastname: Mitra
authors.forename: Amit
authors.initials: A
authors.lastname: Basak
authors.forename: Debdoot
authors.initials: D
authors.lastname: Sheet
mesh_terms: D000893:Anti-Inflammatory Agents / Q000493:pharmacokinetics*; D004337:Drug Carriers / Q000378:metabolism*; D016503:Drug Delivery Systems; D005612:Freeze Drying; D005780:Gelatin / Q000378:metabolism* / Q000648:ultrastructure*; D007091:Image Processing, Computer-Assisted; D007213:Indomethacin / Q000493:pharmacokinetics*; D039823:Iridoids / Q000378:metabolism; D007700:Kinetics; D055595:Mechanical Phenomena; D008855:Microscopy, Electron, Scanning; D013696:Temperature
chemical_list: D000893:Anti-Inflammatory Agents; D004337:Drug Carriers; D039823:Iridoids; D005780:Gelatin; C007834:genipin; D007213:Indomethacin