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affinity biologicals/Factor XII Deficient - Depleted Plasma/FXII-DP

  • 产品编号: FXII-DP
  • 美  元  价: 待定
  • 市  场  价: ¥0.00
  • 品       牌:
  • 产       地: 美国(厂家直采)
  • 公       司: affinitybiologicals
  • 产品分类:
  • 公司分类: Product Family
affinity biologicals/Factor XII Deficient - Depleted Plasma/FXII-DP
  • affinity biologicals/Factor XII Deficient - Depleted Plasma/FXII-DP
商品介绍

Description

Factor XII Deficient – Depleted Plasma

Factor XII Deficient – Depleted Plasma is manufactured from normal citrated human plasma that has been depleted of Factor XII by selective affinity immuno-adsorption using antibodies directed towards FXII.

Only the highest quality citrated plasma is used as starting material and in many cases the parent plasma is available as control material.  Plasma products are typically buffered with the addition of HEPES to 20mM final concentration and are available in 1ml vials to litre quantities.  Our Factor XII Deficient – Depleted Plasma can be used for further manufacturing or research use only applications.


Product Code: FXII-DP

Presentation:  Frozen Factor XII Deficient – Depleted Plasma

Preparation/Handling:  Thaw 1 ml vials in 37oC water bath for 5 minutes; for bulk volumes, thawing time will be dependent on bottle size.

Storage and Stability:  Plasma is shipped frozen and should be stored below -60oC. Product is stable until date stated on vial label when stored at -60oC. Once thawed, plasma is stable for 4 hours at 2-8oC in original vial.

Certificate of Analysis:  available upon request


Description of Factor XII

Factor XII (FXII, Hageman factor) is a 76 kDa, single chain glycoprotein produced in the liver. In plasma, FXII circulates as a protease zymogen at a concentration of approximately 30 μg/ml (400 nM). Upon vascular injury FXII binds to negatively charged extravascular surfaces such as cartilage and skin, which facilitate activation of the zymogen to the active serine protease. Cleavage of F.XII by kallikrein after residue Arg353 produces the enzyme αFXIIa, consisting of a 28 kDa light chain containing the protease domain, and a 52 kDa heavy chain containing the anionic surface-binding domain. Substrates for surface bound FXIIa include the zymogens prekallikrein (PK) and factor XI (FXI) as well as the procofactor high-molecular weight kininogen (HK). The activation of these substrates results in positive feedback activation of FXII. Further cleavage of αFXIIa by kallikrein produces the 28 kDa fragment βFXIIa (Hageman factor fragment). βFXIIa has reduced procoagulant activity as it lacks the anionic surface-binding domain, but is capable of fluid-phase activation of PK, factor VII and complement C1. The activity of F.XIIa in plasma is regulated predominantly by C1-Inhibitor, with relatively minor contributions by α2antiplasmin, α2macroglobulin and antithrombin, even in the presence of therapeutic levels of heparin1-3.

References and Reviews

  1. DeLa Cadena R, Watchtfogel YT, Colman RW, in Hemostasis and Thrombosis, 3rd Edition, eds. RW Colman, J Hirsh, VJ Marder and EW Salzman, pp. 219-240, J.B. Lippincott Co., Philadelphia, 1994.
  2. Tankersley DL, Alving BM, Finlayson JS; Preparation of βF.XIIa (Hageman Factor Fragment) from Human Plasma. Thrombosis Research 25 pp 307-317, 1982.
  3. Pixley RA, Schapira M, Coleman RW; The regulation of Human Factor XIIa by Plasma Proteinase Inhibitors. JBC 260, pp 1723-1729, 1985.

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Affinity Biologicals,Inc.是全球范围内用于血栓形成和止血研究与诊断的产品的主要制造商。我们的产品包括广泛的抗体,结合物,用于人类和动物分析物免疫测定的抗体对,完整的ELISA试剂盒的VisuLize系列以及包括VisuDep免疫缺陷因子缺乏血浆,VisuCal校准血浆的全系列人类血浆产品和VisuCon控制血浆。服务包括蛋白质纯化,抗体生产,测定开发,定制制造(包括定制冻干和能力验证材料)。


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