Determination of ionization constant (pKa) and octanol-water partition coefficient (Log P) of cyclopiazonic acid.
The ionization constant (pKa) and the octanol-water partition coefficient (log P) of the important mycotoxin cyclopiazonic acid (CPA) were determined by means of potentiometric titration, and the lipophilicity profile (log D) was calculated. Under the experimental conditions, pKa of CPA = 2.97 +/- 0.09, log P = 3.83 +/- 0.10, and log D at pH 7.4 = -0.58.
Sobolev
Victor S
VS
U.S. Department of Agriculture, Agricultural Research Service, National Peanut Research Laboratory, P.O. Box 509, Dawson, GA 39842, USA. vsobolev@nprl.usda.gov
D000042:Absorption; D002845:Chromatography / Q000379:methods; D007211:Indoles / Q000737:chemistry*; D007477:Ions / Q000737:chemistry*; D009183:Mycotoxins / Q000737:chemistry*; D000442:Octanols / Q000737:chemistry*; D011199:Potentiometry / Q000379:methods*; D014867:Water / Q000737:chemistry*
D007211:Indoles; D007477:Ions; D009183:Mycotoxins; D000442:Octanols; D014867:Water; C000543:cyclopiazonic acid