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US4100028A Expired / Lapsed US ⏱️ 0.0 years remaining

Method for purification of proteolytic enzymes

Assignee: Individual
•
Filing: 1977-06-07
•
Granted: 1978-07-11
•
Expires: 1997-06-07
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Abstract

Abstract A biological source of proteolytic enzymes such as a culture liquid is brought into contact with a biospecific sorbent prepared by covalent addition of a naturally-occurring polypeptide, viz. bacitracin, to agarose. The sorbed enzyme is eluted with salt buffer solutions. The method of the present invention makes it possible to recover a colorless enzyme; owing to the sorbent selectivity a substantial effect is achieved in a single-stage purification process. The method may be used for recovering proteolytic enzymes of various classes including carboxyl, serine, thiol, metal proteinases and exopeptidases. The novel biospecific sorbent enables purification of various proteolytic enzymes with a yield of from 75 to 95% and with an increased, by 2 to 500 times, activity depending on the purity of the starting material.

Inventors

  • 👤 Valentin Mikhailovich Stepanov
  • 👤 Galina Nikolaevna Rudenskaya

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-07 13:44
CPC Classifications
C; C12; C12N; C12N9/00; C12N9/14; C12N9/48; C12N9/50; C12N9/52; C12N9/54; Y; Y10; Y10S; Y10S435/00; Y10S435/814; Y10S435/815

Claims Analysis

Total Claims: 0
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References Cited (Backward Citations)

US3904478A Cited
US4020268A Cited
US4030977A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1981-07-10 1982-01-09 1982-07-11 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1985-07-10 1986-01-09 1986-07-11 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1989-07-10 1990-01-09 1990-07-11 $7700.00 Window Closed / Lapsed

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