boric acid gel effectively adsorbs ca at weakly alkaline ph and the over-all recoveries of 5 ng and 10 ng samples of authentic norepinephrine ( ne ) and dopamine ( da ) added to a homogenate of rat brain were 98.9 +/- 9.2 % and 103.4 % /- 9.3 % for ne and 96.2 +/- 4.6 % and 99.4 +/- 4.8 % for da , respectively .
C0007412
ca
C0028351
ne