The term polypropylene glycol or PPG is reserved for polymer of low- to medium-range molar mass when the nature of the end-group, which is usually a hydroxyl group, still matters. The term "oxide" is used for high-molar-mass polymer when end-groups no …

Mono mass [M+H] + Formula Compound ID, Possible origin and other comments; 33.033491 CH3OH Methanol , Acetonitrile, solvent 42.033825 CH3CN ACN , Acetonitrile, solvent 59.060374 ... PPG , Polypropylene glycol, ubiquitous polyether 100.075690 C5H10NO NMP , N-methyl 2-pyrrolidone; solvent, floor stripper 100.999937

2022年8月2日 · Structural diversity and polydisperse molecular weights (MWs) are significant challenges for quantification of PPG polymers by liquid chromatography-tandem mass spectrometry (LC-MS/MS) method. This study uses PPG425, PPG1K …

All mass spectra in this site (plus many more) are available from the NIST/EPA/NIH Mass Spectral Library. Please see the following for information about the library and its accompanying search program.

Changing any of the source or compound parameters in a PPG tuning method (such as Q1PosPPG.dam located in the API Instrument project folder in the Analyst Data folder) causes mass shift and resolution issues in the resulting data file.

In electrospray ionization mass spectrometry (ESI-MS) of polypropyleneglycol (PPG), effects of cationizing agents were examined. When NaI was used as a cationizing agent, the distribution of multiply-charged ions in the spectra was greatly affected by …

2019年8月1日 · For many years, polyethylene glycol (PEG) and polypropylene glycol (PPG) were the most widely used calibrants for LC–MS. However, these compounds are very sticky, and tend to remain in the system for long periods, so their use is falling out of favor. All mass spectrometers are calibrated to specify how masses are assigned to peaks.

Polydimethylcyclosiloxanes, widespread compound in industrial products, e.g. deodorants. They are ubiquitously present in ambient air. (Mass difference 74.018793)

Mass calibration is the process of assigning the correct mass-to-charge values to mass peaks. By performing a mass calibration using a calibration standard, such as PPG, you can compare the results with a previous calibration to determine how close the mass-to-charge values for the

The high mass range calibrant is a solution of 3.5 mg/μL polypropylene glycol (PPG) in a solvent of 70:30 methanol/23 mM sodium acetate. The high mass range calibration procedure is designed to work with a PPG that has an average molecular weight of approximately 2700 (Mn~2700), which is Aldrich product number 202347. PPG 2700 is a viscous liquid.