Lightning-Link® antibody labeling kits enable the direct labeling of antibodies, proteins, peptides or other biomolecules for use in R&D applications, drug discovery and the development of diagnostic kits.
Our Fluorescein antibody labeling kit enables the direct conjugation of Fluorescein to any biomolecule with an available amine group. The researcher simply pipettes the antibody or other biomolecule into the vial of Lightning-Link Fluorescein and incubates for 3 hours (for more details please watch the video below).
Do you want to know if your conjugation was a success?
Try our new and unique Conjugate Check&Go! Kit.
Benefits of Lightning-Link include:
|Quick and easy to use||Save time, no special knowledge required|
|No separation steps||100% recovery - no antibody/protein loss|
|Can be used in a wide range of applications||Flexible|
|Freeze dried||Ships at ambient temperature, long shelf-life|
|Fully scalable (10ug to 1g or more)||Easy transfer from R&D to manufacturing|
|Stringently QC tested||Consistent high quality, excellent batch-to-batch reproducibility|
|Large number of labels available||Experimental flexibility|
|Reliable: nearly 300 references||Successfully used in many fields of research|
More about Fluorescein
Fluorescein is one of the most popular fluorescent reagents used in biological research because of its water solubility, intense fluorescence and high absorptivity. It has a peak excitation occurring at 498nm and peak emission of 532nm.
Lightning-Link® Fluorescein applications
Fluorescein conjugates are very popular for:
Please do not hesitate to Contact us to find out more!
Custom labeling services
Are you looking to increase assay sensitivity, decrease background or increase stability? Do you require bulk quantities to suit your manufacturing or research needs?
At Innova we can help with all your bioconjugation requirements, so if you can't find what you’re looking for from our range of products, or need something a bit different or at a larger scale, our range of custom services may be of interest to you. These include:
RAW264 macrophage cell line stained with chicken anti-F4/80 antibody conjugated to Fluorescein using Lightning-Link, counter-stained with DAPI.
The choice of label for your antibody primarily depends upon the application:
Please see the table here for absorption/emission wavelengths of Lightning-Link® fluorescent dyes, proteins and tandems.
Lightning-Link® technology works by targeting free amine groups on your target. It can be used to label antibodies, peptides, proteins and any other molecules with free amine groups.
For advice on labeling molecules other than antibodies please contact our technical support team.
Your antibody must be purified because other molecules with free amine groups will interfere with the reaction resulting in a poor quality conjugate.
A suitable method of purification should be selected:
- Affinity purification - this is the preferred method as it will always result in a purified sample containing only the antibody of interest.
- Protein A or G purification of serum - this will result in a purified sample of all IgG’s contained in the serum. You will have a purified IgG fraction but only a small percentage of this fraction will be the IgG of interest. This IgG fraction will label with our kits, although adjustments in conjugate dilutions will be required.
- Protein A or G purification of tissue culture supernatant or ascites fluid - this method will generate purified antibodies equivalent to affinity purification.
Other purification methods, such as ion exchange chromatography and ammonium sulphate precipitation, are low quality purification methods and should be avoided. Filtration using a 0.2/0.22 µm filter is a method of sterilization not purification, and is therefore not appropriate.
For recommended buffer conditions please see the below table:
1 Please note that individually the concentrations shown should not affect the reaction. However in combination with additional compounds that are not recommended above a certain concentration, the reaction may be affected.
2 If intending to use this kit for immunohistochemistry, it is recommended that there be no gelatin or BSA present.
If your antibody requires purification or the buffer is not compatible with our kits, we have developed an AbSelect™ purification kit range that allows you to quickly and simply purify your antibody and is fully compatible with the Lightning-Link® kits.
The appropriate kit to use depends on your particular sample (species, buffer, contaminants, volume, etc.). We have designed a handy flow chart on the AbSelect™ webpage to help you select a kit, but feel free to contact us if you require further guidance. Please consult the individual kit protocols to see the antibody amount/volume suitable for each kit.
If your antibody is already purified but its concentration is significantly lower than 1mg/ml, you can concentrate it using our Antibody Concentration and Clean Up Kit. This kit can also be used to remove low molecular weight contaminants such as azide, tris or glycine by carrying out a buffer exchange into the buffer supplied in the kit, which is fully compatible with Lightning-Link®.
If your antibody contains BSA, you can now use our BSA removal kit to purify your antibody in a few simple steps. Please note this kit will also enable you to concentrate your antibody.
NB: All the AbSelect kits will ONLY work with antibodies. They will not purify other molecules. The only exception is the concentration and clean up kit (861-0010), which will work with other molecules greater than 10kD.
One of the advantages of the Lightning-Link® technology compared to traditional labeling methods is that conjugate purification is not required. The Lightning-Link® reactions are highly efficient, and the kits have been optimized so that, provided the protocols are followed, there should be only a very low amount of free label left at the end of the conjugation. This remaining free label would have its reactive 'Lightning-Link®' groups blocked by the Quencher provided in the kit, and is washed away during the wash step of your application.
Upon dissolution of the Lightning-Link® mixture with a solution of the antibody, proprietary chemicals in the mixture become activated. This results in the directional covalent bonding of the antibody to the label in a gentle and controlled process at near-neutral pH. The stability of your conjugate is dependent on your antibody and label of choice.
Most Lightning-Link® conjugates can be stored for up to 18 months, undiluted at 4°C. The exception to this is tandem conjugates which are only stable for up to 3 months.
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