Fluor primary

Diglycolamine Systems. The Fluor Econamine process uses digl> co lamine (DGA) to sweeten natural gas. The active DGA reagent is 2-(2-tunino-ethoxy) ethanol, w hich is a primary amine. The reactions of DG, with acid gases are the same as for MEA. Degradation products from reactions with COS and CS2 can be regenerated in a reclaimer. 

Solvent-molecule excitation energy is transferred to the PPO molecules, often called the primary fluor or solute ... 

The light, hv2, from F2 is of longer wavelength than hvx from F and is more efficiently detected by a PMT. Two widely used primary and secondary fluors are 2,5-diphenyloxazole (PPO) with an emission maximum of 380 nm and l,4-bis-2-(5-phenyloxazolyl)benzene (POPOP) with an emission maximum of 420 nm. 

Fluorogenic labelling of pesticides. The subject has been reviewed earlier by Lawrence and Frei (27). Labelling consists in replacing a proton or other atom of a pesticide with a so-called labelling compound such as dansyl chloride (V) or fluores-camine (VI). The former reacts with primary and secondary amines, phenols, some thiols and aliphatic alcohols. The latter reacts very selectively with primary amines. 

Excited solvent molecules transfer their energy to other solvent molecules, and eventually to a primary fluor molecule (Fx), which then emits a photon (hiq) and decays to its ground state (Equations 3-7 and 3-8). A widely used fluor is 2,5-diphenyloxazole (PPO). 

Some scintillation cocktails may employ a secondary fluor that absorbs photons from the primary fluor decay. The excited secondary fluor then reemits new photons at a wavelength more favorable for detection of experimental materials in the scintillation cocktail or more favorable to the phototubes of the particular scintillation counter. However, most modern scintillation counters no longer require the use of a secondary fluor. 

Figure 3-5. Structures of widely used primary and secondary fluors.

Weln, A., Riedel, C., Bruckl, W., Merkel, S., Ott, R., Hanke, B., Baum, U., Fuchs, F., Gunther, K., Reck, T., Papadopoulos, T., Hahn, E.G., Hohenberger, W. Neadjuvant treatment with weekly high-dose 5-fluor-ouracil as 24-hour infusion, folinic acid and oxaliplatin in patients with primary resectable liver metastases of colorectal cancer. Oncology 2003 64 131-138... 

Primary fluorous phosphines PH2(CH2)raRf8 (n = 2-4) (24) (Scheme 2) were prepared from fluor-ous primary alkyl iodides and Li PI I2-dmc (dme = dimethoxyethane), generated from PH3 and nBuLi, in THF at —45 °C.34 The primary phosphines were isolated either as clear liquids or as a low-melting white solid.34 Subsequent free-radical addition reactions of olefinic fluorous precursors with these primary phosphines afforded unsymmetrical ligands. 

Use Primary fluor or wavelength shifter in soluble scintillators. 

Use Primary fluor used in scintillation counters or as wavelength shifters. 

Use As primary fluors or as wavelength shifters in soluble scintillators. 

Both pre- and post-electrophoresis staining can be done. However, post-staining usually is preferred, because it does not alter the separation. Anilinonaphthalene sulfonate can detect 20 pg of protein. Dansyl chloride reacts with amines, amino acids, proteins, and phenols. Exposure of protein for 1 to 2 minutes at 100 °C to dansyl chloride produces a fluorescence capable of detecting 8 to 10 ng. Similarly, exposing primary amine-containing compounds to fluor-escamine at room temperature and an alkaline pH permits the detection of 6 ng of myoglobin. A newly popular compound is 2-methoxy-2,4-diphenyl-3(2H)-furanone (MDPF). It can detect 1 ng of protein, and it is linear from 1 to 500 ng. 

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