تفاعل #1244294

معادلة التفاعل

NH4OH

monoanilino-gossypol

→

aniline

Gossypol

المذيبات

MeOH

ظروف التفاعل

المعالجة

1. 1
   workup.ADDITIONwas introduced past the HPLC column at a flow rate of 0.05 mL/minute
2. 2
   workup.ADDITIONto charge ratio that
3. 3
   workup.ADDITIONIn the second quadrupole, the 667.3 mass to charge ratio

الإجراء التجريبي

The mass spectrometer was a Micromass Quattro Ultima LC/MS/MS detector by Waters, and contained a triple quadrupole mass spectrometer with negative electrospray ionization. Because the HPLC did not provide the correct ionization matrix for negative electrospray ionization of the dianilino-gossypol, 0.6% NH4OH in methanol was introduced past the HPLC column at a flow rate of 0.05 mL/minute. Post-column mixing of the NH4OH in MeOH with the HPLC eluant was achieved using a mixing T-connection. In MS/MS mode, the first quadrupole was used to select 667.3 as the mass to charge ratio that represented the negative ion of dianilino-gossypol. In the second quadrupole, the 667.3 mass to charge ratio was fragmented in a collision cell. The third quadrupole was used to select the fragment ion, monoanilino-gossypol, which had a mass to charge ratio of 574.2 as a result of the loss of an aniline. Detection of the second fragment ion provides improved specificity and increased signal to noise ratios.

المصدر