Solvent extraction methods for delipidating plasma

• US 5,744,038 A
• Filed: 01/30/1996
• Issued: 04/28/1998
• Est. Priority Date: 07/30/1993
• Status: Expired

• Current Assignee: Aruba International Pty Limited
• Original Assignee: Aruba International Pty Limited
• Inventors: Cham, Bill Elliot
• Primary Examiner(s): KIM, SUN U
• Application Number:
  US08/592,379
• Time in Patent Office: 819 Days
• Field of Search: 210/634, 210/643, 210/738, 210/781, 210/782, 210/790, 210/806, 210/219, 210/456, 436/177, 436/178, 530/422, 530/424, 604/4, 604/5, 604/6, 422/256, 422/257, 422/258, 422/259
• US Class Current: 210/634
• CPC Class Codes: A61M 1/3451 the difference in weight between both ultra-filtrate and substitution reservoir being used as control signal
• CPC Class Codes: A61M 1/3472 with treatment of the filtrate
• CPC Class Codes: A61M 1/3486 Biological, chemical treatment, e.g. chemical precipitation; treatment by absorbents
• CPC Class Codes: A61M 1/36 Other treatment of blood in a by-pass of the natural circulatory system, e.g. temperature adaptation, irradiation ; Extra-corporeal blood circuits
• CPC Class Codes: A61M 1/3692 Washing or rinsing blood or blood constituents
• CPC Class Codes: A61M 1/3695 with sedimentation by gravity
• CPC Class Codes: A61M 1/3696 with means for adding or withdrawing liquid substances during the centrifugation, e.g. continuous centrifugation
• CPC Class Codes: A61M 2202/0415 Plasma
• CPC Class Codes: A61M 2202/0456 Lipoprotein
• CPC Class Codes: A61M 2202/08 Lipoids
• CPC Class Codes: Y10T 436/25375 Liberation or purification of sample or separation of material from a sample [e.g., filtering, centrifuging, etc.]
• CPC Class Codes: Y10T 436/255 including use of a solid sorbent, semipermeable membrane, or liquid extraction

Abstract

A separating device for extracting cholesterol from plasma uses a spinner to disperse plasma into an extracting solvent in the form of fine droplets to improve separation efficiency, thereby making it suitable for delipidating blood plasma. Blood plasma is delipidated by providing the plasma to the spinner and dispersing the plasma into the extracting solvent in fine droplets. A de-emulsification step removes residual solvent from the plasma. Blood is removed from an animal and the blood plasma is delipidated. Delipidated plasma is de-emulsified and combined with the animal blood, which is then reintroduced into the animal.

Claims

1. A method for delipidating plasma comprising subjecting the plasma to a solvent extraction step and a de-emulsification step,

the solvent extraction step being carried out in a first container containing extracting solvent, the first container having a spinning container associated therewith, the solvent extraction step including the steps of passing the plasma into the spinning container, dispersing the plasma into fine droplets by spinning the spinning container, and passing the fine droplets through the extracting solvent to produce delipidated plasma,

the de-emulsification step being carried out in a second container, the second container having an inlet and a homogenizer and containing a de-emulsifying medium, the de-emulsification step including the steps of passing the delipidated plasma into the second container through the inlet and homogenizing the delipidated plasma and the de-emulsifying medium.

2. The method of claim 1 wherein the homogenizer is adjacent the inlet of the second container.

3. The method of claim 1 wherein the de-emulsifying medium comprises di-ethyl ether.

4. The method of claim 1, wherein the spinning container contains a packing material which assists in dispersing the plasma.

5. The method of claim 4, wherein the packing material comprises a plurality of spheres.

6. The method of claim 5, wherein the plasma is dispersed laterally into the extracting solvent.

7. The method of claim 6, wherein the spinning container is cylindrical and has an outlet comprising a perforated side wall and wherein the step of dispersing the plasma comprises passing the plasma through the side wall and into the extracting solvent.

8. The method of claim 1, wherein the extracting solvent comprises 20-40% of a lower alcohol and 80-60% of a lower ether.

9. The method of claim 8, wherein the lower alcohol comprises butanol and the ether comprises di-isopropyl ether.

10. The method of claim 1, wherein the spinning container comprises an inlet having a lumen in communication with the interior of the spinning container, whereby plasma is supplied to the spinning container through the inlet.

11. The method of claim 1, wherein the extracting solvent comprises a C₁ -C₄ ether and an alcohol which is not appreciably miscible with the plasma.

12. A method for clinically reducing cholesterol in blood of an animal, the method comprising extracting the blood from the animal, subjecting plasma of the blood to solvent extraction to produce delipidated plasma, subjecting the delipidated plasma to a de-emulsification step to produce de-emulsified plasma, recombining the de-emulsified plasma with the removed blood to produce blood having reduced cholesterol, and reintroducing the blood having reduced cholesterol into the animal,

the solvent extraction step being carried out in a first container containing extracting solvent, the first container having a spinning container associated therewith, the solvent extraction step including the steps of passing the plasma into the spinning container, dispersing the plasma into fine droplets by spinning the spinning container, and passing the fine droplets through the extracting solvent to produce delipidated plasma, and

the de-emulsification step being carried out in a second container, the second container having an inlet and a homogenizer and containing a de-emulsifying medium, the de-emulsification step including the steps of passing the delipidated plasma into the second container through the inlet and homogenizing the delipidated plasma and the de-emulsification step including the steps of passing the delipidated plasma into the second container through the inlet and homogenizing the delipidated plasma and the de-emulsifying medium to produce de-emulsified plasma.