Table 1.

Metal composition comparison of DMEM and Opti-MEM determined by inductively coupled plasma MS

Analyte	Mg	Al	Ca	Cr	Fe	Mn	Co	Ni	Cu	Zn
Detection limits	0.002	0.0002	0.031	0.00005	0.0037	0.00003	0.00003	0.00006	0.00003	0.00008
Units	ppm	ppm	ppm	ppm	ppm	ppm	ppm	ppm	ppm	ppm
Opti-MEM	24.475 ± 3.09	0.004 ± 0.002	40.958 ± 5.27	0.060 ± 0.03	0.040 ± 0.00	0.001 ± 0.00	0.046 ± 0.01	0.001 ± 0.00	0.037 ± 0.02	0.075 ± 0.01
DMEM	19.580 ± 1.18	0.002 ± 0.00	71.99 ± 11.11	0.084 ± 0.04	<DL	0.001 ± 0.00	0.001 ± 0.00	0.002 ± 0.00	0.055 ± 0.02	0.025 ± 0.02
DMEM + ZnCl2	17.407	0.006	72.361	0.041	<DL	0.001	0.000	0.002	0.027	0.108
DMEM + transferrin	19.006	0.004	71.206	0.04	0.026	0.002	0.000	0.002	0.027	0.034
DMEM + cbl	19.287 ± 0.29	0.002	61.032	0.056	<DL	0.001	0.035 ± 0.01	0.001	0.036 ± 0.01	0.023 ± 0.00

<DL, below detection limit.