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Intrauterine Drug Delivery Systems01:21

Intrauterine Drug Delivery Systems

Controlled-release systems for intravaginal and intrauterine drug delivery have been developed primarily for the administration of contraceptive steroid hormones. These delivery routes circumvent first-pass hepatic metabolism, thereby enhancing bioavailability and allowing for reduced systemic dosages compared to oral administration. Such approaches contribute to improved therapeutic efficacy and patient compliance, particularly in long-term contraceptive regimens.Intravaginal Drug Delivery...
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Stimuli-activated drug delivery systems are designed to release drugs in response to specific physical, chemical, or biological stimuli. These systems often utilize hydrogels—three-dimensional, hydrophilic polymer networks capable of swelling in aqueous environments and retaining significant fluid volumes. Upon exposure to particular stimuli, these hydrogels undergo structural transitions that allow the embedded drug to be released. Due to this adaptive behavior, such systems are also called...
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Rate-programmed drug delivery systems release drugs in a controlled manner to maintain therapeutic levels. Three main designs include reservoir, matrix, and hybrid systems.Reservoir systems consist of a drug core enclosed within a membrane that controls drug release. In non-swelling reservoir systems, polymers like ethyl cellulose or polymethacrylates are used. These do not hydrate in aqueous media and control release through membrane thickness, porosity, or insolubility. This type includes...
Modified-Release Drug Delivery Systems: Classification01:23

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Modified-release drug delivery systems improve drug efficacy and minimize side effects by controlling the rate and location of drug release. These systems fall into three categories: rate-programmed, stimuli-activated, and site-targeted.Rate-programmed systems release drugs at a predetermined rate, maintaining consistent therapeutic levels and reducing fluctuations that could lead to toxicity or subtherapeutic effects. These systems use polymeric matrices, reservoir-based designs, or osmotic...
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Transdermal drug delivery systems (TDDS) enable the controlled release of drugs across the skin into systemic circulation. They are particularly advantageous for drugs with short half-lives or narrow therapeutic indices, as they maintain consistent plasma concentrations and reduce the risk of subtherapeutic or toxic levels.TDDS are categorized into monolithic, reservoir, and mixed systems. Monolithic systems embed the drug in a polymer matrix, where diffusion governs release. Reservoir systems...
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Related Experiment Video

Updated: May 17, 2026

Volatile Sex Pheromone Extraction and Chemoattraction Assay in Caenorhabditis elegans
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Published on: August 9, 2024

Photoremovable protecting groups as controlled-release device for sex pheromone.

Sanghamitra Atta1, Mohammed Ikbal, Nishitha Boda

  • 1Department of Chemistry, Indian Institute of Technology, Kharagpur-721302, India.

Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology
|October 31, 2012
PubMed
Summary

Photoremovable protecting groups (PRPGs) enable controlled pheromone release using UV or sunlight. This method is safe for soil microbes and cells, proving effective for pest control in field applications.

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Area of Science:

  • Agricultural Chemistry
  • Organic Chemistry
  • Pest Management

Background:

  • Controlled release of insect sex pheromones is crucial for sustainable pest management.
  • Photoremovable protecting groups (PRPGs) offer a promising strategy for light-triggered release.
  • Developing effective PRPGs for agricultural applications requires assessing their environmental impact and efficacy.

Purpose of the Study:

  • To synthesize and evaluate PRPGs for controlled release of the pheromone (Z)-11-hexadecen-1-ol.
  • To investigate the photophysical properties and release kinetics of caged pheromones under UV and sunlight.
  • To assess the safety and field efficacy of PRPG-caged pheromones for controlling the maize stalk borer (Chilo partellus).

Main Methods:

  • Chemical synthesis of four PRPGs caging (Z)-11-hexadecen-1-ol.
  • Photophysical characterization including fluorescence studies.
  • Controlled release studies in aqueous ethanol and soil medium under UV and sunlight irradiation.
  • Thermogravimetric analysis for volatility assessment.
  • In vitro cytotoxicity and soil bacteria toxicity assays.
  • Field bioassays against Chilo partellus.

Main Results:

  • Caged pheromones with coumarin, pyrene, and anthracene derivatives showed strong fluorescence.
  • Controlled release of pheromone achieved under UV and sunlight in both solution and soil.
  • PRPGs significantly reduced pheromone volatility and were non-toxic to soil bacteria and L929 cells.
  • Field trials demonstrated longer-lasting effectiveness of caged pheromone compared to the free alcohol.

Conclusions:

  • PRPGs serve as effective delivery systems for controlled pheromone release via photolysis.
  • The developed PRPGs are environmentally safe and suitable for agricultural pest management.
  • Sunlight-triggered pheromone release using PRPGs holds significant potential for sustainable pest control strategies.