• Product name

    Native Human IgA1 protein
  • Biological activity

    No reaction by IEP to IgA2 antiserum.
  • Purity

    > 95 % SDS-PAGE.

  • Expression system

  • Protein length

    Full length protein
  • Animal free

  • Nature

    • Species



Our Abpromise guarantee covers the use of ab91020 in the following tested applications.

The application notes include recommended starting dilutions; optimal dilutions/concentrations should be determined by the end user.

  • Applications


  • Form

  • Additional notes

    Protein Determination: Extinction Coefficient (E) 0.1% at 280nm, 1cm pathway = 1.32. Prepared from plasma shown to be non reactive for HBsAg, anti-HCV, anti-HBc, and negative for anti-HIV 1 & 2 by FDA approved tests.No reaction by IEP to IgA2 antiserum.
  • Concentration information loading...

Preparation and Storage

  • Stability and Storage

    Shipped at 4°C. Store at -20°C.

    pH: 7.40
    Preservative: 0.05% Sodium azide
    Constituents: 0.0268% PBS, 0.87% Sodium chloride

General Info

  • Alternative names

    • Ig alpha 1 chain C region
    • IGHA1
    • immunoglobulin heavy constant alpha 1
  • Relevance

    Ig alpha is the major immunoglobulin class in body secretions. It may serve both to defend against local infection and to prevent access of foreign antigens to the general immunologic system.
  • Cellular localization



  • SDS-PAGE: 4-12% Bis-Tris NuPAGE gel
    1. 5 μg Human IgA1 (reduced /heated)
    2. 10 μg Human IgA1 (reduced/ heated)
    3. 20 μg Human IgA1 (reduced/ heated)
    4. Molecular weight markers
    5. 5 μg Human IgA1 (non-reduced/no heat)
    6. 10 μg Human IgA1 (non-reduced/no heat)
    7. 20 μg Human IgA1 (non-reduced/no heat)


ab91020 has not yet been referenced specifically in any publications.

Customer reviews and Q&As

1-2 of 2 Abreviews or Q&A


For IgA1, isolated from human myeloma plasma, (ab91020) and IgA2, isolated from human myeloma plasma (ab91021), we perform an initial Ammonium sulfate precipitation. After, specific affinity columns are used based on the contaminants present. For example, the last time this product was made, we used Affigel Blue (BioRAD) and Gamma-bind for the removal of Albumin and IgG respectively.

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Thank you very much for your interest in ab91020. We unfortunately have not done any test to check whether this protein is polymeric or not. We also do not know if the protein is glycosylated. The molecular weight of monomeric IgA is 160 kDa. Theoretically the image represents a band at ˜150-160 kDa in non reduced/ no heat part of the gel which could represent the monomeric form of theprotein; we are however unable to confirm due to lack of tested data. If you are interested in testing this antibody then I can offer a discount off a future purchase if you buy ab91020 now, test it inIndirect ELISAand submit feedback to us in the form of an Abreview. It doesn’t matter whether the Abreview is positive or negative, we would just really like to receive your feedback. The discount would be to the value of 1 free (PRIMARY ANTIBODY). If you are interested in this offer, please follow these steps: 1. Reply to this e-mail to let me know that you would like to proceed and test ab91020 in Indirect ELISA. I will then send a discount code. This code must be issued before purchasing ab91020 so please wait for my reply before ordering. 2. Purchase ab91020 either by phone, fax, or online ( 3. Test it in Indirect ELISA. 4. Let us know the results, positive or negative, using our Abreview system (this will take about 10 minutes and images are great if you have them!). To find out how to submit an Abreview, please visit: ordered and the discount code is valid for 4 months after issue. We are always pleased to obtain feedback about our products and any information is greatly appreciated! Even if ab91020 turns out to be unsuitable for Indirect ELISA, you will still receive the discount on your next purchase after your Abreview has been submitted. Please let me know if you have any questions about this offer and I would be happy to help you further. The Terms and Conditions of this offer can be found at:

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