Abstract
An apparatus for continuous fractionation of peptides on the basis of amphoteric nature of sample peptides was developed. A tank (66.5 cm x 8 cm x 8 cm, L x W x H) was divided into 12 compartments by a thin agarose gel layer. A drain tube (5.5 cm in length and 0.7 cm in i.d.) was fixed through the bottom of each compartment to give a height of 4 cm from the bottom. The tank with 12 compartments and electrodes was referred to as an autofocusing unit. The peptide solution or water was delivered to the sample compartments of the first unit. The solutions drained from the first unit were successively delivered to the second and third units. To the electrodes of three units, a direct electric current was applied. By using the present apparatus, peptides in casein hydrolysate can be continuously fractionated at least for 5 h. Better resolution was obtained in the second and third units.
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