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ELISA standard curve | LifeTein Peptide Blog

ELISA standard curve # Standards and the standard curve 1. Make up a stock solution of 0.08 ug of protein/100 ul of PBS and store at 4 C To make the stock: Use protein extracted from fresh hyphae that are nearly 100% immunoreactive. To determine this, run a Br

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ELISA standard curve #

Standards and the standard curve 1. Make up a stock solution of 0.08 ug of protein/100 ul of PBS and store at 4 C

To make the stock:

Use protein extracted from fresh hyphae that are nearly 100% immunoreactive. To determine this, run a Bradford and an ELISA assay on the samples and compare concentrations.

If Bradford and ELISA values are nearly the same, make an ELISA curve and test the values by comparing results to a known curve.

Make up 500 ul aliquots of the stock with a concentration of 0.08 ug of protein in 100 ul of PBS or 0.40 ug of protein in 500 ul of PBS.

2. Put 100 ul of the 0.08 ug protein/100 ul of PBS in 2 of the wells and 50 ul PBS in the other ten wells. 3. Transfer 50 ul of the 0.08 ug sample to a neighboring well that has 50 ul PBS. 4. Mix 3-4 times with the micropipette by pulling the sample up and down. 5. Remove 50 ul from these two wells and transfer to 2 adjacent wells. Mix 3-4x. Repeat for these two wells. 6. After the third dilution, remove 50 ul from the two wells that have 100 ul and dispose of it.

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Intracellular Localization Studies

Texas Red-labeled antibodies and peptides have been instrumental in studying the localization of specific molecules within cells. By targeting specific antigens or proteins, researchers can visualize their distribution in various cellular compartments:

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Clinical Trials and Research

Several clinical trials have explored the use of PADRE in cancer vaccines. For instance, vaccines targeting Mucin 1 (MUC1), a glycoprotein overexpressed in many cancers, have shown promising results when combined with PADRE. These vaccines have demonstrated the ability to elicit strong immune responses, including the production of antibodies against cancer-specific antigens.

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Practical and safety references

These excerpts are educational, not personalised medical instructions.

How-to reference

How to solubilize my synthetic peptides? #

Please refer to this FAQ for details: Handling and Storage of Synthetic Peptides. If the peptides are still cloudy, or turbid, you may have reached the limit of solubility. When the peptides are insoluble in the buffer, please try to sonicate, centrifuge, and lyophilize the peptide. Make sure to break the lyophilized lumps into a fine powder. Then try a small volume of a good agent 8M Urea, NMP, DMF, or DMSO to dissolve the peptide. Then dilute with water or your desired buffer. For peptides with Arg or LYs, you should try to lower the pH to 6 because the protonated amino acids will help solubility. Sonication and the following solvents may help with difficult peptides: 1) Begin with 100 % acetonitrile then dilute with water until 50% 2) Begin with 100% DMSO then dilute with water until 30 % 3) Dissolve it with 8M Urea 4) Dissolve it with 6 or 8 M Guanidine hydrochloride 5) 6M GuHCL, 0.05% TFA, pH2, 6) 100% TFA 7) 40% AcOH, 30%ACN, 30% water

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Storage reference

Storage temperatures and conditions #

For many of our antibodies, freezing at -20 C or -80 C in small aliquots is the optimal storage condition. Aliquotting minimizes damage due to freezing and thawing, as well as contamination introduced by pipetting from a single vial multiple times. Aliquots should be no smaller than 10 µl. Upon receiving the antibody, centrifuge at 5,000 x g for 30 seconds to pull down the solution, and transfer aliquots into low-protein-binding microcentrifuge tubes. Antibodies should be frozen as soon as possible, storage at 4 C upon receipt of the antibody is acceptable for one to two weeks, followed by freezing for long-term storage. To prevent microbial contamination, sodium azide can be added to an antibody preparation to a final concentration of 0.02% (w/v). If using antibodies for in vivo studies, please be sure to use preparations that do not contain sodium azide. This antimicrobial agent blocks the cytochrome electron transport system. Sodium azide will interfere with any conjugation that involves an amine group and should be removed before proceeding with the conjugation. After conjugation, antibodies can be stored in sodium azide but 0.01% thimerosal (Merthiolate), which does not have a primary amine, is an acceptable alternative. Sodium azide can be removed from antibody solutions by dialysis or gel filtration. The molecular weight of IgG is 150,000 daltons (IgM is ~ 600,000); the molecular weight of sodium azide is 65 daltons. A micro-dialysis unit with a cut off at 14,000 dalt…

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