GB740299A - Improved process for the preparation of enzyme extracts from liver and extracts so produced - Google Patents
Improved process for the preparation of enzyme extracts from liver and extracts so producedInfo
- Publication number
- GB740299A GB740299A GB31913/53A GB3191353A GB740299A GB 740299 A GB740299 A GB 740299A GB 31913/53 A GB31913/53 A GB 31913/53A GB 3191353 A GB3191353 A GB 3191353A GB 740299 A GB740299 A GB 740299A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cathepsin
- catalase
- per cent
- extracts
- liver
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N9/00—Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes
- C12N9/0004—Oxidoreductases (1.)
- C12N9/0065—Oxidoreductases (1.) acting on hydrogen peroxide as acceptor (1.11)
Abstract
Enzyme extracts (particularly catalase, cathepsin and arginase) are obtained from enzymebearing mammalian liver tissue by treating them with water to obtain an aqueous enzyme extract and bringing the pH of the latter to 5.0-5.6 to precipitate impurities. The tissues may be extracted at pH 6.0-7.0 and the extract then acidified, or both steps may be carried out at 5.0-5.6. Preferred conditions are pH 6.3-6.7 for the extraction and 5.2-5.4 for the precipitation. The liver material may, before extraction, be washed at below 0 DEG C. with an aqueous organic solvent (lower primary alcohol or acetone) at a concentration of 30-70 per cent. Preferably 40-50 per cent ethanol is used at - 3 DEG to - 15 DEG C. The purified enzyme extract after treatment at pH 5.0-5.6 is fractionally precipitated (below 0 DEG C.) with 15-60 per cent ethanol or methanol at pH 4.2-7.4, the ionic strength being below 0.2. Preferred conditions for this step are pH 5.4-6.2, ionic strength below 0.1, temperature - 3 DEG to - 15 DEG C. and alcohol concentration 20-50 per cent. The amorphous precipitate so obtained (containing catalase and cathepsin) is dissolved in water at pH above 5.8 (preferably buffered) and the pH then reduced to 5.1-6.3 to crystallize the catalase. Cathepsin can be obtained from the supernatant liquor. Examples are given of the production of catalase and cathepsin from comminuted beef and hog liver tissues.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US740299XA | 1952-11-22 | 1952-11-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB740299A true GB740299A (en) | 1955-11-09 |
Family
ID=22117262
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB31913/53A Expired GB740299A (en) | 1952-11-22 | 1953-11-17 | Improved process for the preparation of enzyme extracts from liver and extracts so produced |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB740299A (en) |
-
1953
- 1953-11-17 GB GB31913/53A patent/GB740299A/en not_active Expired
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