Jackson Immuno Research Inc.
specializing in secondary antibodies and conjugates

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Biotin-SP (long spacer) IgG Fraction Monoclonal Mouse Anti-Rabbit IgG, light chain specific

(min X Bov, Gt, Ar Hms, Hrs, Hu, Ms, Rat, Shp Ig)


Target: Rabbit
Host: Mouse
Antibody Format: IgG Fraction Monoclonal
Specificity: IgG, light chain specific
Minimal Cross Reactivity: Bovine, Goat, Armenian Hamster, Horse, Human, Mouse, Rat, Sheep Immunoglobulins
Conjugate: Biotin-SP (long spacer)
Product Category: Anti‑Light Chain-Specific Antibodies for Western Blotting after IP
Clonality: Monoclonal
RRID: AB_2339153

Based on antigen-binding assay, Western blotting, and/or ELISA, the antibody reacts with the light chains on rabbit IgG and with those common to other rabbit immunoglobulins. The antibody does not react with the heavy chain of rabbit IgG. The antibody has been tested by ELISA to ensure minimal cross-reaction with bovine, goat, armenian hamster, horse, human, mouse, rat and sheep immunoglobulins, but it may cross-react with immunoglobulins from other species.
Physical State: Freeze-dried solid

Storage and Rehydration: Store freeze-dried solid at 2-8°C. Rehydrate with the indicated volume of dH2O and centrifuge if not clear. Prepare working dilution on day of use. Product is stable for about 6 weeks at 2-8°C as an undiluted liquid.
Extended Storage after Rehydration: Aliquot and freeze at -70°C or below. Avoid repeated freezing and thawing. Alternatively, add an equal volume of glycerol (ACS grade or better) for a final concentration of 50%, and store at -20°C as a liquid.
Expiration date: one year from date of rehydration. The expiration date may be extended if test results are acceptable for the intended use.


Buffer: 0.01M Sodium Phosphate, 0.25M NaCl, pH 7.6
Stabilizer: 15 mg/ml Bovine Serum Albumin (IgG-Free, Protease-Free)
Preservative: 0.05% Sodium Azide

Biotin-SP (long spacer)



Biotin-SP is our trade name for biotin with a 6-atom spacer positioned between biotin and the protein to which it is conjugated. When Biotin-SP-conjugated antibodies are used in enzyme immunoassays, there is an increase in sensitivity compared to biotin-conjugated antibodies without the spacer. This is especially notable when Biotin-SP conjugated antibodies are used with alkaline phosphatase-conjugated streptavidin. Apparently, the long spacer extends the biotin moiety away from the antibody surface, making it more accessible to binding sites on streptavidin. Biotinylated antibodies require an additional reagent for visualization. We offer streptavidin and Mouse Anti-Biotin conjugated to fluorophores and enzymes.

This product is for IN VITRO RESEARCH USE ONLY. It is not a medical device and it is not intended for diagnostic or therapeutic purposes.

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