Sucrose exerts an osmotic pressure of 300 mOsm at a concentration of about 0.25M, which is iso-osmotic with the contents of most mammalian cells. This concentration is approximately 81.25 grams/L or 8.125%, as per protocols used to remove platelets. Recommended procedures for removing platelets:
Perform Procedure 1077 or 1077/1119.
Collect the cell band and layer it over a second gradient.
A. Bottom layer = 1077-1
B. Top layer = 8.125% sucrose solution (prepared in deionized water).
C. Layer the cell suspension on top of the gradient formed in steps 1-2.
D. Use a 300 g spin for 10-15 minutes.
E. Depending upon the original volume of the cell suspension, times and speed may have to be adjusted to maximize cell recovery.
F. Use separate tubes for mononuclear and polymorphonuclear cells.
A2055
Tubes ACCUSPIN™, stériles, d′une capacité de 50 ml
radiation sterilized tube fitted with a high density polyethylene barrier
About This Item
Produits recommandés
Niveau de qualité
Stérilité
sterile; irradiated
Forme
tubes
Application(s)
hematology
histology
Température de stockage
15-25°C
Description générale
Application
- dans l'isolement de lymphocytes et autres cellules mononucléées.
- dans l'isolement de cellules progénitrices endothéliales issues de sang de cordon ombilical[1].
- dans l'isolement d'une couche de cellules mononucléées à partir d'échantillons de moelle osseuse.
- Produit pouvant être utilisé pour la purification d'aspirats de moelle osseuse humaine dans le but d'étudier la valeur thérapeutique d'inhibiteurs de BET vis-à-vis de la leucémie myéloïde aiguë.
Principe
Quantité
Informations légales
Mention d'avertissement
Danger
Mentions de danger
Conseils de prudence
Classification des risques
Resp. Sens. 1 - Skin Sens. 1
Code de la classe de stockage
12 - Non Combustible Liquids
Classe de danger pour l'eau (WGK)
WGK 3
Point d'éclair (°F)
Not applicable
Point d'éclair (°C)
Not applicable
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How should a 4-20% sucrose gradient be used to reduce platelet contamination, as recommended in the user manual?
1 answer-
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Is Accuspin (A2055) suitable for use with canine blood?
1 answer-
The suggestion is to make a decision based on individual circumstances.If currently using a plain centrifuge tube for collecting PBMCs from canine blood using a single density gradient, the Accuspin Tubes can be used for the same collection, provided that the G force does not exceed 1000G and a single density gradient is used.
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Does the Accuspin Tubes Product #A2055, which are prefilled with a frit, also contain EDTA or another anticoagulant?
1 answer-
None of the Accuspin spin tubes (filled or unfilled) contain any anticoagulant. It is expected that when blood is drawn, it is typically drawn into a vacuum tube that already contains an anticoagulant or it is necessary to add anticoagulant immediately after the blood draw is completed. The most common anticoagulants used are EDTA and Heparin.
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Are Accuspin tubes compatible with blood that has been anticoagulated with ACD-A?
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Certainly, Accuspin tubes are suitable for use with any blood containing an anticoagulant, with fresher blood being preferable. Regardless of the anticoagulant used, the anticoagulant is essentially washed away during the steps to remove the density gradient from the collected white blood cells. With ACD-A, the cell band is wider at the interface and the cells are more dispersed over a larger area, possibly due to the dextrose/glucose in the formulation. When using ACD-A, a somewhat unusual cell band is produced after the tubes are removed from the centrifuge. In comparison, cell bands with heparin, EDTA, sodium citrate, and other typical anticoagulants typically provide a rather narrow cell band when viewed from the side of the Accuspin tube.
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Can I remove the Frit after collecting the mononuclear cells to recover the granulocytes?
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When using the Accuspin System to collect Peripheral Blood Mononuclear Cells (PBMCs), there is no expectation that the neutrophils can be recovered. Although it is possible to dislodge the frit, some granulocytes will be suspended in the lower layers of the density gradient. The remaining granulocytes will appear as a gray layer on top of the packed red blood cells.
In theory, the end-user may be able to collect this buffy coat that sits atop the packed red blood cell layer. It is recommended to either perform a lysis step to lyse the red blood cells, or run the cells back over another density gradient - such as Histopaque 11191 that has a density of 1.119 g/ml.
Instead of performing this 2-step procedure that has not been validated, the more logical option would be to simply run the whole peripheral blood over a 2-step discontinuous gradient. Currently, Histopaque 10771 and Histopaque 11191, are offered. The Histopaque 11191 instructions for use are available in the DOCUMENTATION section in the 'More Documents' tab of the product detail page:
https://www.sigmaaldrich.com/product/sigma/a2055#product-documentation
https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/product/documents/193/872/a2055pis.pdfHelpful?
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