We measured pregnenolone levels in culture media of PC-12 and SHSY 5Y cells successfully. Our protocol is as follows
The cells replace with 2 x 10 6 density in 6 well-plates. Methanol/acetic acid (v/v: 1x10 4/1) ratio is used as a mobile phase for determination of pregnenolone levels. Pregnenolone standard is prepared in methanol. The conditions of HPLC methods (for Schimadzu LC) ; (4.6x250mm C18 ; methanol/Acetic acid (v/v: 1x104/1); 2 mL/min; 30 ºC; UV-VIS detector, 200 nm, injection volume 100 µL)