Browdy and Neimark
Isoelectric point marker
 A group of compounds having the following general formula can be obtained by reacting chromoprotein and organic acid: ##STR1## wherein X is a chromophore, P is a protein, NH.sub.2 is mainly .epsilon.-amino group of lysine, n is a positive integer of 1 to 18, and m is a positive integer in the relation of m.ltoreq.n. This compound group has one to eighteen organic acids bonded thereto, and shows various isoelectric points in accordance with the number of the organic acids, but the respective isoelectric points are maintained constant. If such compounds each having an individual isoelectric point, are used as isoelectric point markers, it is possible to recognize accurately the position of isoelectric point only by a visual operation. 
Oriental Yeast Company
G B G
G01N B01D G01N
inventional inventional inventional
Katsumi Hiraku Isamu Yasuo Tuyosi Takekazu
Fujii Saito Takagahara Suzuki Fujita Horio