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- W2079563753 abstract "Eight highly purified human pituitary FSH preparations and purified preparations of the α-and β-subunits of FSH were fractionated by an electrofocusing technique in the pH range of 2·5–10·0 on a sucrose density gradient. The human (h) FSH activity in each of the eluted fractions was monitored by an in-vitro bioassay and a radioimmunoassay procedure. After electrofocusing, the overall recovery of the biological activity of the eight preparations was between 80 and 94% (mean 88%). On the other hand, the recovery of immunoreactivity ranged between 30 and 84% (mean 71%). A loss of over 85% of hFSH immunoreactivity was observed when the α- and β-subunits of hFSH were fractionated by the same procedure. The specific loss of varying amounts of immunoreactivity in all preparations during electrofocusing was also reflected by a proportional increase in the ratios of biological activity (B) to immunoreactivity (I); preparation A, which exhibited a loss of 70% of the immunoreactivity, had a threefold increase in its B/I ratio after electrofocusing. Significant differences were observed in the electrofocusing profiles of the eight preparations both in terms of their pI values and of their spread. The disparity in the relative distribution of hFSH activities in different pH regions suggested major differences in the carbohydrate moieties (sialic acid content) of the preparations studied, probably as a result of the chemical manipulations involved in the purification of the hormone. It is suggested that a combination of several (but certainly not all) of the preparations might serve as a provisional International Reference Preparation for hFSH radioimmunoassays." @default.
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- W2079563753 date "1982-02-01" @default.
- W2079563753 modified "2023-09-26" @default.
- W2079563753 title "BIOLOGICAL AND IMMUNOLOGICAL PROPERTIES OF DIFFERENT MOLECULAR SPECIES OF HUMAN FOLLICLE-STIMULATING HORMONE: ELECTROFOCUSING PROFILES OF EIGHT HIGHLY PURIFIED PREPARATIONS" @default.
- W2079563753 doi "https://doi.org/10.1677/joe.0.0920195" @default.
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