Nanoparticle Carriers via Spray Drying with Carbohydrate Mediators
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Solution Overview
Problem
Current spray-drying techniques for producing nanoparticle carriers result in a broad size range of particles, from nano to micron size, which is not ideal for targeted drug delivery, and there is a need for spherical nanoparticles with a narrow size distribution and smooth surface for effective delivery of active compounds.
Innovation Solution
A process involving the preparation of a double emulsion with a polymer, blending the drug into the emulsion phases, doping either the oil-phase or outer-water phase with a carbohydrate, and using Gemini surfactants to produce nanoparticles with a narrow size distribution of 100 nm to 1000 nm, enhancing surface activity and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If spray-drying technique is used to produce nanoparticle carriers, then the process is cost effective and quick with low water content, but the particle size range is broad from nano to micron size
Solution Approach 1:
The patent modifies critical process parameters including inlet temperature (60-150°C), atomization pressure (1-10 bar), and feed rate (0.1-10 mL/min) to control particle size distribution. By optimizing these parameters, the process produces nanoparticles within a narrow size range (100-1000 nm) while maintaining the efficiency benefits of spray drying
Solution Approach 2:
The patent introduces drying-aid agents (sugars such as lactose, sorbitol, and trehalose at concentrations of 1-20% w/v) as intermediaries that protect the colloidal structure during spray drying. These agents prevent particle aggregation and maintain narrow size distribution by acting as protective mediators between the spray-drying process and the nanoparticle carriers
2Ease of manufacture
If conventional spray drying is used, then the process is simple and quick, but the nanoparticle surface is irregular and morphology is poor
Solution Approach 1:
The patent optimizes atomization parameters (pressure 1-10 bar, gas flow rates) and drying conditions (inlet temperature 60-150°C, residence time) to control droplet formation and evaporation rates. These parameter changes ensure uniform droplet size and smooth particle surfaces while maintaining process simplicity
Solution Approach 2:
Drying-aid agents (lactose, sorbitol, trehalose) serve as surface-active intermediaries that coat the nanoparticle surfaces during spray drying. This coating prevents surface irregularities and promotes smooth, spherical morphology by mediating the interaction between the polymer matrix and the drying environment
3Reliability
If nanoparticles are produced for drug delivery, then drug delivery capability is improved, but particle aggregation and degradation occur
Solution Approach 1:
Drying-aid agents (sugars at 1-20% w/v) act as protective intermediaries that form a stabilizing matrix around the nanoparticles during spray drying. This matrix prevents particle aggregation, maintains colloidal stability, and protects the encapsulated drugs from degradation during storage and transport
Solution Approach 2:
The patent optimizes drying conditions (inlet temperature 60-150°C, outlet temperature 30-80°C, residence time 0.1-10 seconds) to minimize thermal stress on the nanoparticles. By controlling these parameters, the process produces stable particles with preserved drug activity while maintaining delivery efficiency
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The process achieves the production of spherical nanoparticles with a narrow size distribution of 180 to 250 nm, improving stability and bioavailability of drugs like Rifampicin, Isoniazid, and Ethambutol, with high encapsulation efficiency and prolonged circulation times, overcoming issues of particle irregularity and degradation.
Implementation Method 1
spray-drying technique has seen wide application in the preparation of pharmaceutical powders... atomising suspensions or solutions into droplets followed by a drying process in flowing hot air
Implementation Method 2
atomising suspensions or solutions into droplets
Implementation Method 3
preparing a double emulsion of water-oil-water including one or more polymer which forms the basis of the nanoparticle carrier
Data Source
AI summary
The invention provides a process for the production of nanoparticle carriers for drug delivery, said nanoparticles being produced by preparing a double emulsion of water-oil-water including one or more polymer which forms the basis of the nanoparticle carrier, blending the drug to be delivered into one of the emulsion phases, doping either the oil-phase or the outer-water phase with a carbohydrate, and spray drying the emulsion to form nanoparticles of a narrow particle size distribution of 100 nm to 1000 nm, which nanoparticles are substantially spherical.