Liposome Size Control
Liposome Size Control - Related Videos
11:35
Constant Pressure-controlled Extrusion Method for the Preparation of Nano-sized Lipid Vesicles
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Cited by 29 •
2012
This protocol describes an extrusion method for preparing lipid vesicles of sub-micron sizes with a high degree of homogeneity. This method uses a pressure-controlled system with controlled nitrogen flow rates for liposome preparation. The lipid preparation1,2, liposome extrusion, and size characterization will be presented herein.
09:03
Giant Liposome Preparation for Imaging and Patch-Clamp Electrophysiology
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Cited by 23 •
2013
Reconstituting functional membrane proteins into giant liposomes of defined composition is a powerful approach when combined with patch-clamp electrophysiology. However, conventional giant liposome production may be incompatible with protein stability. We describe protocols for producing giant liposomes from pure lipids or small liposomes containing ion channels.
16:24
Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
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Cited by 13 •
2012
The goal of this experiment is to determine and control the size, shape and stability of self-assembled discotic amphiphiles in water. For aqueous based supramolecular polymers such level of control is very difficult. We apply a strategy using both repulsive and attractive interactions. The experimental techniques applied to characterize this system are broadly applicable.
10:33
Delivery of Therapeutic siRNA to the CNS Using Cationic and Anionic Liposomes
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Cited by 18 •
2016
The goal of this protocol is to use cationic/anionic liposomes with a neuro-targeting peptide as a CNS delivery system to enable siRNA to cross the BBB. The optimization of a delivery system for treatments, like siRNA, would allow for more treatment options for prion and other neurodegenerative diseases.
01:16
Precipitate Formation and Particle Size Control
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2024
In precipitation gravimetry, the precipitating agent should react specifically or selectively with the analyte. While a specific reagent reacts with the analyte alone, a selective reagent can react with a limited number of chemical species. The obtained precipitate should be either a pure substance of known composition or easily converted to one by a simple process, such as ignition or drying. In addition, the precipitate should be insoluble and easily filterable. In general, filterability...
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These factors modify the conditions under which lipid vesicles form and therefore influence their resulting dimensions. Lipid composition affects membrane characteristics, while mixing energy and sonication apply physical forces during preparation. Adjusting these variables allows researchers to tune size before downstream processing, which is important when designing vesicles for consistent biological interactions or cargo delivery.
Extrusion passes newly formed vesicles through filters with defined pore sizes. This processing step restricts the dimensions that vesicles can retain and narrows the particle-size distribution. A more uniform population improves batch-to-batch consistency, making it easier to compare formulation conditions and relate liposome size to cellular uptake, tissue distribution, encapsulation, or release behavior.
Size affects several linked properties, including colloidal stability, cellular uptake, tissue distribution, encapsulation performance, and release kinetics. Consequently, changing dimensions can alter how a formulation behaves in biological environments and how efficiently it delivers or presents its contents. Controlling size helps bioengineers distinguish size-dependent effects from other formulation variables when evaluating therapeutic or diagnostic systems.
Formation-stage adjustment changes the conditions that create vesicles, including lipid composition, mixing energy, and sonication. Post-formation refinement applies a separate physical process, such as membrane extrusion through defined pores, to narrow the existing size distribution. Using these stages distinctly gives researchers both a way to tune dimensions and a way to improve population uniformity.
A basic workflow begins by selecting the lipid composition and establishing preparation conditions that include mixing energy and, when appropriate, sonication. After vesicles form, membrane extrusion through filters with defined pore sizes can refine their dimensions and reduce size variation. The resulting formulation can then be compared for consistency and performance in its intended bioengineering application.
Controlled sizing supports the design of drug-delivery systems, diagnostic carriers, and model membranes. It is especially useful when researchers need to examine how nanoscale dimensions affect biological interactions, therapeutic outcomes, encapsulation, or release. Consistent size distributions also strengthen comparisons among formulations by reducing variability that could otherwise obscure the effect of the tested design.