起订量:
2053 Human/monkey anti-porcine type II collagen IgG antibody assay kit, OPD
北京博蕾德生物科技有限公司BeiJing Biolead Biology Sci & Tech Co., Ltd.,成立于2007年。目前我公司已经与几十家著名的试剂供应商建立了长期稳定的合作关系,已成为众多的中国总代理或一级代理商;并且为满足国内客户的较早需求,我们也与时俱进地不断与世界上更多的洽谈合作代理事宜;企业的主要目标是把国外有特点的生物前沿产品引进中国,以及国外供应商在国内没有代理的,可以给科研用户代购进来,实现双赢的一个战略模式,现在由于发展需要,需要一批有识之士加盟,给我们企业注入一些新的血液。
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Human - Anti-Collagen Type I & II Antibody Assay
Chondrex provides human IgA and IgG antibody assay kits (can be used for monkey sera) to determine the diversity of human antibodies using various species of type I and type II collagen coated wells in addition to uncoated wells for use as a blank. These kits employ effective blocking agents to minimize non-specific reactions caused by serum components. Generally, it is impossible to accuray determine antibodies in human sera by ELISA and RIA using BSA and BSA-Tween as blocking agents.
Human/Monkey Anti-Type I Collagen IgA Antibody Assay Kit
Collagen Coated Wells | Chromagen | Catalog # | |
Bovine I | OPD | 1042 | |
Bovine I | TMB | 1042T | |
Chick I | OPD | 1041 | |
Chick I | TMB | 1041T | |
Human I | OPD | 1045 | |
Human I | TMB | 1045T | |
Porcine I | OPD | 1043 | |
Porcine I | TMB | 1043T | |
Human/Monkey Anti-Type I Collagen IgG Antibody Assay Kit
Collagen Coated Wells | Chromagen | Catalog # | |
Bovine I | OPD | 1032 | |
Bovine I | TMB | 1032T | |
Chick I | OPD | 1031 | |
Chick I | TMB | 1031T | |
Human I | OPD | 1035 | |
Human I | TMB | 1035T | |
Porcine I | OPD | 1033 | |
Porcine I | TMB | 1033T | |
Human/Monkey Anti-Type II Collagen IgA Antibody Assay Kit
Collagen Coated Wells | Chromagen | Catalog # | |
Bovine II | OPD | 2062 | |
Bovine II | TMB | 2062T | |
Chick II | OPD | 2061 | |
Chick II | TMB | 2061T | |
Human II | OPD | 2065 | |
Human II | TMB | 2065T | |
Porcine II | OPD | 2063 | |
Porcine II | TMB | 2063T | |
Human/Monkey Anti-Type II Collagen IgG Antibody Assay Kit
Collagen Coated Wells | Chromagen | Catalog # | |
Bovine II | OPD | 2052 | |
Bovine II | TMB | 2052T | |
Chick II | OPD | 2051 | |
Chick II | TMB | 2051T | |
Human II | OPD | 2055 | |
Human II | TMB | 2055T | |
Porcine II | OPD | 2053 | |
Porcine II | TMB | 2053T | |
Non-Specific Reactions in ELISA and RIA for Assaying Human Serum Antibodies
Human sera, especially from patients with autoimmune diseases, contain high levels ofimmunoreactive components, which create extremely high non-specific reactions in ELISA and RIA. These types of non-specific reactions are caused by the hydrophobic binding of immunoglobulins in sample specimens onto plastic surfaces, and cannot be blocked by ordinary blocking agents such as bovine serum albumin (BSA) and Tween 20 (Figure 1). Importantly, these false positive reactions caused by the serum sample itself have not been well understood, and are falsely considered a real antibody-antigen reaction in many cases, even now.
Figure 1 – Non-specific reactions caused by a hydrophobic binding of immunoglobun components in human sera onto plastic surfaces.
Note the OD values in antigen non-coated wells are almost equal to the OD values in human type I (HI) and type II collagen (HII)-coated wells (A). Goat serum components effectively block the hydrophobic binding of human immunoglobulins onto the plastic surfaces (B)
In order to obtain a real value of antigen-antibody reaction, it is critical
1) to choose proper blocking agents which effectively block these kinds of non-specific reactions,
2) to determine a unique non-specific background value of individual samples using antigen-non-coated wells, and
3) to subtract the background value from the value determined in antigen-coated wells.
Our ELISA kits contain enough reagents to run two plates on two separate occasions (see assay procedure) and may be used for monkey sera as well as human sera. Customized kits to measure antibody levels to various species of type I and type II collagen can be custom ordered.
Diversity of Anti-Collagen Antibodies in Human Sera
In general, antibodies to collagen in human sera are highly specific to heterologous collagen such as bovine or chick type I and/or type II collagen, and cross-react to other species and types of collagen including autologous collagen, regardless of the disease even in normal healthy controls. To determine human serum antibodies with significant diversity in antigen specificity, Chondrex provides ELISA plates (wells) coated with various species of type I and type II collagen, in addition to uncoated wells for use as a blank.
IgA antibodies to type II collagen are often associated with IgG antibodies in human sera. Importantly, IgA and IgG antibodies in individual sera share identical collagen types and species specificity, indicating that IgA and IgG antibodies were elicited by stimulation with the same collagen. Therefore, it is highly likely that heterologous collagen in the diet may play a primary role in anti-collagen antibody production, regardless of the disease. However, this does not indicate that type II collagen in the diet is the only source of antigen capable of eliciting anti-type II collagen antibodies. This is because, type I collagen also found abundantly in the diet shares amino acid sequences with type II collagen by more than 80%. In fact, the antibodies in human sera often cross-react to both type I and type II collagen.