Chemistry: molecular biology and microbiology – Measuring or testing process involving enzymes or... – Involving antigen-antibody binding – specific binding protein...
Reexamination Certificate
2005-09-27
2005-09-27
Le, Long V. (Department: 1641)
Chemistry: molecular biology and microbiology
Measuring or testing process involving enzymes or...
Involving antigen-antibody binding, specific binding protein...
C435S023000, C435S024000, C435S265000, C435S267000, C436S175000, C436S177000, C436S518000, C436S816000, C436S825000, C436S901000
Reexamination Certificate
active
06949344
ABSTRACT:
A method the direct analysis of an analyte in keratinized structures, e.g., hair and fingernails, which comprises preparing a mixture containing a low redox potential activator compound such as dithiothreitol or dithioerythritol, an enzyme suitable for the digestion of the keratin structure, a sample of the keratin structure and a biological detergent that aids the digestion of the keratinized structure at a relatively low pH, e.g., between about 6.2 and 8; permitting the enzyme to at least substantially digest the sample of keratin structure, and subjecting the digest solution to analysis, preferably by radioimmunoassay, to determine the identity and amount of analyte in the keratin structure sample. To accelerate the method, cupric sulfate may be added to the mixture after degradation of the keratin sample. The enzyme may be a peptidase, endopeptidase or proteinase, with papain, chymopapain, and proteinase K being preferred for use in the invention. The preferred biological detergents include betaine, sulfo-betaine, alkylglucosides and bile acids.
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Le Long V.
Psychemical Corporation
Ropes & Gray LLP
Yang Nelson
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