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Process for preparing Limulus lysate

  • US 4,322,217 A
  • Filed: 04/14/1981
  • Issued: 03/30/1982
  • Est. Priority Date: 06/27/1980
  • Status: Expired due to Term
First Claim
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1. A process for treating under lysate treating conditions Limulus amebocyte lysate having decreased sensitivity to endotoxin due to the presence of an endogenous lysate inhibitor prior to any subsequent reaction with endotoxin with an enhancing amount of a lysate sensitivity enhancing agent having lysate sensitivity enhancing characteristics to neutralize or partially neutralize said lysate inhibitor thereby increasing the lysate sensitivity to endotoxin, said lysate enhancing agent being selected from the group consisting of(I) amphoteric surfactants having the following formulae:

  • ##STR8## wherein R1 is an alkylene radical having from 1 to 4 carbon atoms;

    Y and Y'"'"' are each (1) hydrogen, (2) lower alkyl or (3) hydroxy lower alkyl;

    R2 and R3 are each (1) lower alkyl or (2) hydroxy lower alkyl;

    n is 0 or 1, when n is 0, R4 is alkyl containing from about 8 to about 18 carbon atoms;

    when n is 1, R4 is an alkylene radical having from 1 to about 6 carbon atoms;

    R5 is an alkyl containing from about 8 to about 18 carbon atoms;

    M is hydrogen, sodium, potassium or ammonium;

    (II) anionic surfactants have the following formulae;

    
    
    space="preserve" listing-type="equation">(R.sub.6).sub.n.sbsb.1.(Y)Ar.(SO.sub.3 M).sub.n.sbsb.2 (E)
    
    
    space="preserve" listing-type="equation">R.sub.5 OSO.sub.3 M (F)whereinR5, Y and M have the same meaning as set forth aboveR6 is an alkyl from 8 to 24 carbon atomsn1 is an integer from 1 to 3n2 is 1 or 2Ar is phenyl or naphthyl;

    (III) cationic surfactants having the following formula;

    ##STR9## wherein R5, Y and Y'"'"' have the same meaning as set forth above; and

    (IV) nonionic surfactants having the following formula;

    
    
    space="preserve" listing-type="equation">R.sub.5 R.sub.7 R.sub.8 N→

    O (H)whereinR5 has the same meaning as set forth aboveR7 and R8 are each methyl or ethyl; and

    those nonionic surfactants selected from the group consisting of the condensation product of about 10 to 30 moles of ethylene oxide with the monoester of a hexahydric alcohol containing 6 carbon atoms with the ester group containing 10 to 20 carbon atoms.

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