QSH is a group of water soluble CdSe/ZnS quantum dot nanocrystals with amphiphilic polymer coating. Their surface functional group is carboxylic acid. The zeta potential of QSH is from -30mV to -50mV. Their organic layers consist of a monolayer of Octadecylamine and a monolayer of amphiphilic polymer. The thickness of the total organic layers is about 4 nm. The hydrodynamic size of the nanocrystals is about 8-10 nm larger than their inorganic core size measured by TEM.
QSH is very stable in most buffer solutions in the pH range of 3-14.
QSH can be conjugated to protein, peptide and DNA by following our Standard Conjugation Protocol. Ocean NanoTech also offers QSH-Protein Conjugation Kit which includes all the crosslinking agents and buffer solutions. If you need to perform QHP-protein conjugation, we recommend that you remove your original buffer solutions and use our Activation Buffer to disperse your protein for the conjugation. Otherwise, precipitation may occur. If it’s your first time to perform this conjugation, you may use BSA as model protein to get familiar with the whole process.
| QSH-530-04 | >30% | <35 nm | 530 nm | +/-10 nm | 4 nmol | 1100.00 | |
| QSH-550-04 | >30% | <35 nm | 550 nm | +/-10 nm | 4 nmol | 1100.00 | |
| QSH-580-04 | >50% | <25 nm | 580 nm | +/-10 nm | 4 nmol | 1100.00 | |
| QSH-600-04 | >50% | <25 nm | 600 nm | +/-10 nm | 4 nmol | 1100.00 | |
| QSH-620-04 | >50% | <25 nm | 620 nm | +/-10 nm | 4 nmol | 1100.00 |
1. Quantum Yield: measured using an integrating sphere
2. FWHM: Full Width of Half Maximum
3. Amount: measurement based on core molar extinction coefficient
[W. W. Yu. L. Qu, W. Guo. X. Peng, Chem. Mater.2003, 15 (14),2854-2860, corrected in volume 15, 2003]
