Stacking Gel Preparation
Stacking Gel Preparation - Related Videos
10:24
Preparation of 3D Collagen Gels and Microchannels for the Study of 3D Interactions In Vivo
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Cited by 16 •
2016
Collagen is a core component of the ECM, and provides essential cues for several cellular processes ranging from migration to differentiation and proliferation. Provided here is a protocol for embedding cells within 3D collagen hydrogels, and a more advanced technique for generating randomized or aligned collagen matrices using PDMS microchannels.
03:22
SDS-PAGE Based Extraction of Extracellular Vesicles Associated Proteins: A Procedure to Extract Proteins from EVs and Prepare Them for In-Gel Digestion
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2023
In this video, we demonstrate the SDS-PAGE in-gel digestion method for protein extraction from extracellular vesicles or EVs. Once isolated, the obtained protein fragments can be used for proteomic analysis.
09:38
Scaling of Engineered Vascular Grafts Using 3D Printed Guides and the Ring Stacking Method
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Cited by 7 •
2017
Scalable engineered blood vessels would improve clinical applicability. Using easily sizable 3D-printed guides, rings of vascular smooth muscle were created and stacked into a tubular form, forming a vascular graft. Grafts can be sized to meet the range of human coronary artery dimensions by simply changing the 3D-printed guide size.
06:30
Gel Purification
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2023
Gel purification is used to recover DNA fragments after electrophoretic separation. DNA recovery from an agarose gel includes three basic steps: binding, washing and eluting from a silica column. DNA is believed to bind to silica in the presence of high salt via a salt bridge. Following binding, DNA is washed of impurities and eluted under low salt conditions disrupting this interaction. This video goes through a step-by-step, generalized procedure for cutting out a band from the gel, gel...
10:53
Anionic Polymerization of an Amphiphilic Copolymer for Preparation of Block Copolymer Micelles Stabilized by π-π Stacking Interactions
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Cited by 2 •
2016
The key steps of living anionic polymerization of phenyl glycidyl ether (PheGE) on methoxy-polyethylene glycol (mPEG-b-PPheGE) are described. The resulting block copolymer micelles (BCMs) were loaded with doxorubicin 14% (wt%) and sustained release of drug over 4 days under physiologically relevant conditions was obtained.
FAQs
Chloride ions migrate as the leading ions, while glycine moves more slowly as the trailing ion. Their different migration behavior creates a moving boundary within the discontinuous buffer system. Proteins become compressed between these ion fronts into a narrow band before entering the resolving gel, reducing differences in their starting positions during SDS-PAGE.
The low-concentration stacking layer supports the initial compression of proteins into a narrow, aligned band before separation begins. The resolving gel then provides the phase in which proteins are separated. Maintaining this distinction helps proteins enter the resolving region from a similar position, which supports sharper bands and more reliable molecular-weight comparisons.
Acrylamide concentration, buffer composition, polymerization, and the boundary between the stacking and resolving gels are the critical preparation variables identified for this layer. If any of these features is poorly controlled, proteins may not be concentrated into a sufficiently narrow starting band. Careful control therefore supports consistent separation and clearer SDS-PAGE results.
The stacking gel and resolving gel serve sequential but different functions. The stacking layer concentrates proteins and aligns them before separation, whereas the resolving phase is where separation produces distinctions used for molecular-weight comparison. Preserving the transition between the two layers is important because the concentration step must precede the resolving phase to improve band sharpness.
Preparation requires making the low-concentration polyacrylamide layer, establishing the appropriate buffer composition, and controlling polymerization. The interface with the resolving gel must also be maintained carefully so that proteins can pass from the concentration phase into the separation phase. These steps determine whether samples enter the resolving gel as a narrow, consistent band.
The interface marks the transition from protein concentration to separation during SDS-PAGE. A properly controlled boundary allows the compressed sample to enter the resolving gel from a similar position, improving band sharpness and the consistency of molecular-weight comparisons. This is especially relevant when biological samples are compared across lanes and interpretation depends on distinct protein bands.