The Ytterbium/ Holmium doped NaYF4 nanoparticles were synthesized by a modified thermal-decomposition method. Currently this product is spherical with a diameter from 10-15nm. The particles were stabilized with hydrophobic properties and can be dispersed in hexane or any other non-polar solvents, such as toluene and cyclohexane, to form a stable single phase colloidal solution. The emission intensity is higher than most of the fluorescence dye and could be noticed by naked eyes under regular in-door environment. The life time of the particles are close to unlimited due to the special mechanism. The fluorescence can’t be quenched by heat, surface modification, UV exposure, acid/base or aggregation. The particles can be easily modified to hydrophilic surface.
Xeno-free and serum-free cell culture products for supporting the culture of human stem cells and regular cells in 2D and 3D. This series of products replace human or animal derived products, such as laminin, fibronectin, vitronectin, collagen, matrigel, and so on.
4Arm-PEG-VS is a homo-multi-functional PEG reagent with a thiol reactive vinylsulfone group on each arm. VS group selectively reacts with free thiol, SH, sulfhydryl or mercapto groups.
4Arm-PEG-VS can be used as crosslinkers for PEGylation of proteins and peptides, nanoparticle and so on.