Alginate Microcapsules
Alginate Microcapsules - Related Videos
10:01
Alginate Microcapsule as a 3D Platform for Propagation and Differentiation of Human Embryonic Stem Cells (hESC) to Different Lineages
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Cited by 20 •
2012
We have optimized a microencapsulation technique as an effective 3D platform for propagation and differentiation of embryonic stem cells to endoderm and dopaminergic (DA) neurons. It also provides an opportunity for immune-isolation of cells from the host during transplantation. This platform can be adapted for other cell types.
02:52
Synthesis of Metal Oxide Microcapsules Using Metal-Reducing Bacteria
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2025
Source: Lin, P., et al. Synthesizing Sodium Tungstate and Sodium Molybdate Microcapsules via Bacterial Mineral Excretion. J. Vis. Exp. (2018).This video demonstrates the procedure for synthesizing rigid metal oxide microcapsules by culturing metal-reducing bacteria with metal ions, followed by sequential purification through sonication, centrifugation, and ethanol washing.
10:33
Generation of Alginate Microspheres for Biomedical Applications
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Cited by 33 •
2012
In the following sections, we outline procedures for the preparation of alginate microspheres for use in biomedical applications. We specifically illustrate a technique for creating multilayered alginate microspheres for the dual purpose of cell and protein encapsulation as a potential treatment for type 1 diabetes.
07:13
Alginate Encapsulation of Pluripotent Stem Cells Using a Co-axial Nozzle
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Cited by 14 •
2015
We established a method of encapsulating pluripotent stem cells (PS cells) into alginate hydrogel capsules using a co-axial nozzle. This prevents cells from aggregating excessively and limits the shear stress experienced by cells in suspension culture. The technique is applicable to the mass production of PS cells as well as research on stem cell niche.
10:20
Mammalian Cell Encapsulation in Alginate Beads Using a Simple Stirred Vessel
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Cited by 13 •
2017
This video and manuscript describe an emulsion-based method to encapsulate mammalian cells in 0.5% to 10% alginate beads which can be produced in large batches using a simple stirred vessel. The encapsulated cells can be cultured in vitro or transplanted for cellular therapy applications.
FAQs
Transport depends on the capsule’s structure and formulation. These features determine whether nutrients, metabolites, or therapeutic molecules can diffuse through the semipermeable matrix, while the entrapped material remains retained. In bioengineering designs, researchers therefore adjust capsule characteristics to balance molecular exchange with protection of cells, enzymes, drugs, or other biological cargo.
Calcium ions rapidly crosslink alginate chains when alginate-containing droplets enter the calcium-ion solution. This ionic interaction converts each liquid droplet into a gelled capsule and establishes the matrix that surrounds the cargo. The resulting crosslinked structure is central to capsule formation, retention, and the diffusion behavior required for the intended application.
Stability, transport, and biocompatibility are key design considerations. A capsule must remain sufficiently stable to protect its cargo, yet allow appropriate diffusion of nutrients, metabolites, or therapeutic molecules. Its formulation and structure should also support compatibility with the biological setting. Balancing these properties determines whether the capsules perform effectively in a bioengineering system.
A basic workflow begins by combining alginate with the selected cells, enzymes, drugs, or other biological material. The mixture is then formed into droplets and introduced into a calcium-ion solution. Calcium-mediated ionic crosslinking rapidly gels the droplets into capsules. Their structure and transport properties are subsequently considered in relation to the intended use.
Researchers may choose these carriers when biological material needs protection while remaining accessible to selected diffusing substances. The approach can entrap cells, enzymes, drugs, or other materials and support their retention within a hydrogel matrix. This makes it relevant to controlled drug delivery, cell-based systems, and experiments involving engineered biological materials.
In bioengineering, alginate microcapsules support cell encapsulation, controlled drug delivery, tissue engineering, and studies of engineered biological systems. Their value comes from combining cargo retention with selective molecular exchange. Applications require attention to capsule stability, transport, and biocompatibility because these properties influence protection, delivery behavior, and interaction with the surrounding biological context.