Inactivation of extracellular enveloped viruses in blood and blood components by phenthiazin-5-ium dyes plus light
First Claim
1. A method for inactivating extracellular enveloped viruses which are present in a leukocyte-containing transfusible composition, comprising:
- (a) leukodepleting said composition by a factor of at least 5 log10 ;
(b) adding an adequate amount of at least one phenothiazin-5-ium dye to said leukodepleted composition of step (a), to produce therein an effective concentration of said dye(s), wherein said concentration is acceptable for transfusion and wherein said concentration in conjunction with light is effective to inactivate extracellular enveloped viruses contained in said composition; and
(c) irradiating said phenothiazin-5-ium dye-containing composition of step (b) for an effective length of time, with light of effective intensity and wavelengths which are absorbed by said dye(s), whereby said irradiation in conjunction with said dye(s) inactivate extracellular enveloped viruses in said composition.
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Abstract
This invention provides methods for inactivating pathogenic contaminants in whole blood, plasma, cellular blood components, or in any combination thereof, by adding a phenthiazin-5-ium dye(s) thereto and irradiating said dye-containing composition for an effective length of time with light of wavelengths from 560 to 800 nm or red light, of an effective intensity, whereby the irradiation in conjunction with the dye(s) inactivate substantially all pathogenic contaminants contained therein. The methods of this invention inactivate pathogenic contaminants, such as viruses, bacteria and parasites, without substantially altering the whole blood, plasma, cellular blood components, or combinations thereof, such that they are suitable for transfusion.
93 Citations
33 Claims
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1. A method for inactivating extracellular enveloped viruses which are present in a leukocyte-containing transfusible composition, comprising:
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(a) leukodepleting said composition by a factor of at least 5 log10 ; (b) adding an adequate amount of at least one phenothiazin-5-ium dye to said leukodepleted composition of step (a), to produce therein an effective concentration of said dye(s), wherein said concentration is acceptable for transfusion and wherein said concentration in conjunction with light is effective to inactivate extracellular enveloped viruses contained in said composition; and (c) irradiating said phenothiazin-5-ium dye-containing composition of step (b) for an effective length of time, with light of effective intensity and wavelengths which are absorbed by said dye(s), whereby said irradiation in conjunction with said dye(s) inactivate extracellular enveloped viruses in said composition. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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2. A method for inactivating extracellular enveloped viruses which are present in a leukocyte-containing, red blood cell-containing composition, comprising:
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(a) leukodepleting said composition; (b) adding an adequate amount of at least one phenothiazin-5-ium dye to said composition to produce therein an effective concentration of said dye(s), wherein said concentration is acceptable for transfusion and wherein said concentration in conjunction with light is effective to inactivate extracellular enveloped viruses contained in said composition; and (c) irradiating said phenothiazin-5-ium dye-containing composition for an effective length of time, with light of an effective intensity and of wavelengths which are absorbed by said dye(s), whereby said irradiation in conjunction with said dye(s) inactivate extracellular enveloped viruses in said composition, wherein said red blood cells retain their viability. - View Dependent Claims (31)
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3. A method for inactivating extracellular enveloped viruses which are present in a leukocyte-containing, platelet-containing composition, comprising:
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(a) leukodepleting said composition; (b) adding an adequate amount of at least one phenothiazin-5-ium dye to said composition to produce therein an effective concentration of said dye(s), wherein said concentration is acceptable for transfusion and wherein said concentration in conjunction with light is effective to inactivate extracellular enveloped viruses contained in said composition; and (c) irradiating said phenothiazin-5-ium dye-containing composition for an effective length of time, with light of an effective intensity and of wavelengths which are absorbed by said dye(s) whereby said irradiation in conjunction with said dye(s) inactivate extracellular enveloped viruses in said composition, wherein said platelets retain their viability.
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4. A method for inactivating extracellular enveloped viruses which are present in leukocyte-containing plasma, comprising:
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(a) leukodepleting said plasma by a factor of at least 5 log10 ; (b) adding an adequate amount of at least one phenothiazin-5-ium dye to said leukodepleted plasma of step (a) to produce therein an effective concentration of said dye(s), wherein said concentration is acceptable for transfusion and wherein said concentration in conjunction with light is effective to inactivate extracellular enveloped viruses contained in said composition; and (c) irradiating said phenothiazin-5-ium dye-containing plasma of step (b) for an effective length of time, with light of an effective intensity and of wavelengths which are absorbed by said dye(s), whereby said irradiation in conjunction with said dye(s) inactivate extracellular enveloped viruses in said plasma. - View Dependent Claims (5, 6, 7, 8)
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32. A process for treating a leukocyte-containing red blood cell-containing composition in order to inactivate any extracellular lipid enveloped human pathogenic virus contained therein without incurring substantial disruption or inactivation of said cells, comprising:
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(a) leukodepleting said composition; (b) contacting said red blood cell-containing composition having a concentration of red blood cells≧
1×
109 cells/ml with a viricidally effective amount of at least one phenothiazin-5-ium dye, with light and with ambient oxygen to inactivate said virus if present therein and to effect a virus kill of at least 4 log10. - View Dependent Claims (33)
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Specification