Universal Recombinant Human IgG Antibody Mix

Catalog No.	PA007410
Product Name	Universal Recombinant Human IgG Antibody Mix
Supplier Name	Syd Labs, Inc.
Brand Name	Syd Labs
Isotype	human IgG1, IgG2, IgG3, and IgG4 (S228P) kappa.
Specificity/Sensitivity	neither human nor mouse samples.
Applications	ELISA, flow cytometry, immunoblotting, immunoprecipitation, immunocytochemistry, immunofluorescence, and isotype controls.
Reactivity	None of Human, Mouse, and Rat.
Purification	The recombinant human IgG antibodies were affinity-purified from supernatant of mammalian cells cultured in a chemically defined medium by affinity-chromatography using protein A and G.
Form Of Antibody	1x PBS.
Purity	>95% by SDS-PAGE under reducing conditions.
Shipping	The recombinant human IgG antibody mix is shipped with ice pack. Upon receipt, store it immediately at the temperature recommended below.
Stability & Storage	Use a manual defrost freezer and avoid repeated freeze-thaw cycles. For maximum recovery of the product, centrifuge the original vial after thawing and before removing the cap. 1 month from date of receipt, 2 to 8°C as supplied. 12 months from date of receipt, -20°C to -70°C as supplied.
Note	Recombinant human IgG antibody mixes: animal free production; lot-to-lot consistency; no binding to human tissues; adjustable formulation of the human IgG antibodies in the antibody mixes. Best normal human serum alternative; normal human serum blocking reagent alternative; serum-derived human IgGs alternative.
Order Offline	Phone: 1-617-401-8149 Fax: 1-617-606-5019 Email: message@sydlabs.com Orleave a message with a formal purchase order (PO) Or credit card.

Description

PA007410: Universal Recombinant Human IgG Antibody Mix

The universal recombinant human IgG antibody mix is a mixture of recombinant human IgG1, IgG2, IgG3, and IgG4 (S228P) kappa antibodies which bind to neither human nor mouse samples. The percentage of human IgG1 and IgG4 (S228P) are in the same range as combination of IgG2 and IgG3.

Background of Universal Recombinant Human IgG Antibody Mix

Normal human serum and purified human IgGs from normal human serum are commonly used as non-specific passive blocking solution for antibody-based immuno-assays. Recombinant human IgG antibody mixes, as a direct alternative to normal human serum and even human IgGs purified from human serum or a non-specific passive blocking solution, can be used to eliminate interfering antibodies from immuno-assay systems using capture and detection antibodies. There is higher percentage of human IgG1 in serum. So, recombinant human IgG antibody mixes with different percentages of human IgG1, IgG2, IgG3, and IgG4 (S228P) were made to meet customers’ requirements of different applications. A customized recombinant human IgG antibody mix with different percentages of human IgG1, IgG2, IgG3, and IgG4 can be provided.

Features of recombinant human IgG antibody mixes compared with normal human serum and serum-derived human IgGs:

1) Human free production. CHO cells rather than human are used in antibody production.

2) Lot-to-lot consistency. CHO cells which are used for antibody drug manufacturing are used to manufacture the human IgG antibodies in the antibody mixes. All production is under control and predictable.

3) As a targeted or passive antibody blocker to interfering antibodies and no binding to human tissues. In contrast, some serum-derived human IgGs may bind to unknown targets in some human tissues.

4) Adjustable percentages of the antibodies in the antibody mixes. A customized recombinant human IgG antibody mix with different percentages of human IgG1, IgG2, IgG3, and IgG4 (S228P) can be easily made according to customers’ applications.

Recombinant human IgG antibody mixes are the best normal human serum alternative as blocking reagents, and serum-derived human IgGs alternative.

Questions and Answers:
Question: Normal human serum is often used for blocking or saturating immunoassays, especially those involving tissue samples such as immunohistochemistry (IHC). How much should recombinant antibody mixes be added to replace normal human serum?
Answer: Our recombinant human IgG antibody mixes can be used as normal human serum alternative for blocking reagent, and more specifically, the purified normal IgGs alternative. It was said that there is 65 to 85 mg/ml protein in a normal human serum sample, and 7 to 16 mg/ml IgG in a typical human serum and plasma sample. It means that there is 8.2% to 10.8% IgGs in proteins in normal mouse serum. One may calculate the amount of human IgGs in a human serum sample. One should also consider the percentage of various human IgG isotypes in the human serum sample vs recombinant human IgG antibody mixes. Conditions of optimal human IgG antibody mix performance should be determined experimentally by customers.

The most popular human Fc blocking reagents include:
Anti-human CD16 (clone 3G8), and CD32 (Clone IV.3): for flow cytometry, immunohistochemistry (IHC), and immunoprecipitation (IP). It is highly specific for FcγRII (CD32) and FcγRIII (CD16), and reduces background staining; it may not block all Fc receptors. Clones 10.1, and 22 or H22 are the most widely used anti-human FcγRI (CD64) clone for Fc blocking in flow cytometry and functional assays. It prevents non-specific Fc receptor binding on monocytes, macrophages, and dendritic cells, improving antibody specificity.
Purified human IgGs or mixes of human isotype controls: for general Fc blocking in IHC and immunofluorescence (IF). It is cheap and easy to use but it is less specific, and may even introduce unwanted immunoglobulins. Syd Labs supply various human IgG isotype controls.
Normal mouse serum, purified mouse IgG or isotype controls: for flow cytometry. It can serve as a control to block Fc receptors but it is non-specific for Fc receptors. It is cheap and easy to use but it is less specific, and may even introduce unwanted immunoglobulins. Our recombinant mouse IgG antibody mixes are affordable; the ratio of various IgGs is optimized and adjustable without any unwanted immunoglobulins.
Bovine Serum Albumin (BSA) or FBS: for general blocking in Western Blot (WB) and IHC. They are readily available to reduce non-specific binding but less effective at Fc receptor blocking.
Commercial Fc blocking solutions: for flow cytometry, IHC, and functional assays. They are normally pre-optimized and highly effective but more expensive than DIY solutions.

Best choice of human Fc blocking reagents based on your application are:
For flow cytometry: anti-human CD16 (Clone 3G8), CD32 (Clone IV.3), and CD64 (Clone 10.1, and 22 or H22).
For Immunohistochemistry (IHC) and Immunofluorescence (IF): Normal mouse serum, purified mouse or human IgGs or isotype controls or commercial Fc blocking kits. Our recombinant mouse IgG antibody mixes and recombinant human IgG isotype controls are affordable; the ratio of various IgGs is optimized and adjustable without any unwanted immunoglobulins.
For Western Blot and ELISA: BSA or FBS.
For functional assays (e.g., blocking Fc-mediated effects): Commercial Fc blocking reagents.

Syd Labs provides the following anti-human Fc blocking reagents:

Anti-human CD16 monoclonal antibody (Clone: 3G8)
Anti-human CD32 monoclonal antibody (Clone: IV.3)
Anti-human CD64 monoclonal antibody (Clone: 22)
Purified human IgG
Recombinant human IgG antibody mixes
Recombinant human IgG isotype control antibodies
Recombinant mouse IgG antibody mixes
Recombinant mouse IgG isotype control antibodies
Recombinant rat IgG antibody mixes
Recombinant rat IgG isotype control antibodies

Syd Labs provides the following anti-mouse Fc blocking reagents:

Anti-mouse CD16/CD32 monoclonal antibody (Clone: 2.4G2)
Recombinant mouse IgG antibody mixes
Recombinant mouse IgG isotype control antibodies
Recombinant rat IgG antibody mixes
Recombinant rat IgG isotype control antibodies

Please remember our product information: Universal Recombinant Human IgG Antibody Mix: PA007410 Syd Labs

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