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Buccutite™ MTA-Dye 650
Our Buccutite™crosslinking technology provides the most convenient and effective crosslinking method to link two biomolecules with a high conjugation yield. Our method uses one pair of crosslinkers: Buccutite™ MTA and Buccutite™ FOL. MTA is added to one molecule, while FOL is added to another molecule. The cross-linking reaction is initiated by mixing Molecule-1-Buccutite ™ MTA and Molecule-2-Buccutite ™ FOL. This crosslinking reaction occurs under extremely mild and neutral conditions without any catalyst required. It is robust and efficient. Many of our customer have requested us to offer the stand-alone Buccutite™ MTA and Buccutite™ FOL reagents to expand the application of Buccutite™crosslinking technology. This Buccutite™ MTA reagent is used to determine the number of MTA groups of the Molecule-1-Buccutite ™ MTA. The number of MTA linkers provides an important parameter to to optimize crosslinking process.
Example protocol
PREPARATION OF STOCK SOLUTION
Unless otherwise noted, all unused stock solutions should be divided into single-use aliquots and stored at -20 °C after preparation. Avoid repeated freeze-thaw cycles.
Buccutite™ MTA-Dye 650 stock solution (10 mM):
Add 200 uL DMSO to Buccutite™ MTA-Dye 650 vial to prepare 10 mM stock solution. Note: The Buccutite™ MTA-Dye 650 stock solution should be stored at -20 °C after preparation and stable for 2 months if avoid repeated freeze-thaw cycles.
SAMPLE EXPERIMENTAL PROTOCOL
MTA Sample Preparation
- Use 100 ug MTA-modified sample (for example: antibody or other protein modified with MTA group, the MW should be above 15,000).
- Adjust the volume to 100 uL with PBS.
Run MTA Assay
- Add 10 uL 10 mM Buccutite™ MTA-Dye 650 stock solution to MTA sample solution.
- Keep the reaction mixture at room temperature and rotate or shake it for 60 minutes.
- Prepare spin column (Cat#60500) for sample purification.
- Load the reaction mixture to a spin column with a clean collecting tube. After all the solution loaded to the column, add 10 uL PBS to the top and centrifuge the column for 5 minutes at 1,000 x g.
- Collect the solution with a collecting tube.
- Measure the absorption spectra with 0.5 mL Quartz Cuvette or Nanodrop. Note: Dilute the elution by 5 - 10 folds with PBS, measure the absorption spectrum from 800 nm to 250 nm, or only read the absorbance number at 280 nm and 654 nm.
- Calculate MTA # (moles of MTA / mole of molecule) with the following equation.
MTA # = (A654 / 250000) / {(A280 - 0.09 X A654) / EC}
A280: absorbance of the elution at 280 nm
A654: absorbance of the elution at 654 nm
EC: Extinction Coefficient of the sample (M-1cm-1)
Calculators
Common stock solution preparation
Table 1. Volume of DMSO needed to reconstitute specific mass of Buccutite™ MTA-Dye 650 to given concentration. Note that volume is only for preparing stock solution. Refer to sample experimental protocol for appropriate experimental/physiological buffers.
| 0.1 mg | 0.5 mg | 1 mg | 5 mg | 10 mg | |
| 1 mM | 86.09 µL | 430.448 µL | 860.896 µL | 4.304 mL | 8.609 mL |
| 5 mM | 17.218 µL | 86.09 µL | 172.179 µL | 860.896 µL | 1.722 mL |
| 10 mM | 8.609 µL | 43.045 µL | 86.09 µL | 430.448 µL | 860.896 µL |
Molarity calculator
Enter any two values (mass, volume, concentration) to calculate the third.
| Mass (Calculate) | Molecular weight | Volume (Calculate) | Concentration (Calculate) | Moles | ||||
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Page updated on November 20, 2024
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