title: Size-exclusion chromatography of biological samples which contain extremely alkaline proteins.
abstract: An improved size-exclusion chromatography (SEC) was developed to isolate extremely basic (alkaline) proteins, such as trypsin (pI=10.5), lysozyme (pI=11), and histone (pI=10.8). Develosil 300 Diol-5 (300 x 8 mm I.D., 30 nm average pore diameter) column was used with an eluent of 0.1 M sodium phosphate, 1.5 M sodium chloride, glycerol (40%, v/v), 2-propanol (10%, v/v), and Brij-58 (1%, v/v). Under these conditions, the final apparent pH becomes to 4.0, and pH adjustment is not necessary. Column temperature and flow rate were 15 degrees C and 0.2 ml/min, respectively. This elution system is stable and reliable, and applications onto human pancreatic juice, human bile, and tissue homogenates were successfully achieved. Since this system is convenient for protein analysis, it is expected to be generally applicable to clinical and biochemical research for identifying protein components in combination with microsequencing.
authors.affiliation: Division of Endocrinology and Metabolism, National Children's Medical Research Center (now National Research Institute for Child Health and Development), 3-35-31 Taishido, Setagaya, Tokyo 154-8567, Japan.
authors.forename: Kou
authors.initials: K
authors.lastname: Hayakawa
authors.forename: Lei
authors.initials: L
authors.lastname: Guo
authors.forename: Elena A
authors.initials: EA
authors.lastname: Terentyeva
authors.forename: Xiao Kang
authors.initials: XK
authors.lastname: Li
authors.forename: Hiromitsu
authors.initials: H
authors.lastname: Kimura
authors.forename: Masahiko
authors.initials: M
authors.lastname: Hirano
authors.forename: Kazuyuki
authors.initials: K
authors.lastname: Yoshikawa
authors.forename: Teruo
authors.initials: T
authors.lastname: Yoshinaga
authors.forename: Takeaki
authors.initials: T
authors.lastname: Nagamine
authors.forename: Noriyuki
authors.initials: N
authors.lastname: Katsumata
authors.forename: Toshiaki
authors.initials: T
authors.lastname: Tanaka
mesh_terms: D000468:Alkalies / Q000302:isolation & purification; D000595:Amino Acid Sequence; D001646:Bile / Q000737:chemistry*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D008969:Molecular Sequence Data; D010189:Pancreatic Juice / Q000737:chemistry*; D011506:Proteins / Q000032:analysis* / Q000737:chemistry*; D020539:Sequence Analysis, Protein / Q000379:methods*; D014020:Tissue Extracts / Q000032:analysis*
chemical_list: D000468:Alkalies; D011506:Proteins; D014020:Tissue Extracts