In which of the following are hydrogels used ? 1. Controlled drug delivery in patients 2. Mobile air-conditioning systems 3. Preparation of industrial lubricants Select the correct answer using the code given below:
Explanation
Statement 1 is correct: Hydrogels are widely used in biomedical applications, especially in controlled drug delivery systems. Their high water content, biocompatibility, and ability to swell and release drugs in a controlled manner make them ideal for:
- Transdermal drug delivery - Oral and ocular delivery - Injectable drug systems
Statement 2 is incorrect: Hydrogels are not commonly used in mobile air-conditioning systems. These systems typically use refrigerants and mechanical components (like compressors, condensers, and evaporators) to provide cooling. While hydrogels can absorb and release moisture, they are not suitable for the cooling and dehumidification processes involved in air conditioning.
Statement 3 is incorrect: Hydrogels are not used in the formulation of industrial lubricants. Lubricants generally consist of base oils (mineral, synthetic, or vegetable) and additives for enhancing properties like viscosity, anti-wear, and corrosion resistance. Hydrogels do not possess the required lubricating properties, especially under high pressure and temperature conditions.