Patents by Inventor An L. Nguyen

An L. Nguyen has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 5288613
    Abstract: The present invention relates to a method for determining the degree of freshness of raw, frozen and processed edible fish by monitoring the degradation of adenine triphosphate to inosine monophosphate, inosine and hypoxanthine. This method comprises simultaneously determining, by use of a suitable amperometric electrode such as platinum vs. silver/silver chloride polarized at 0.7 V, the amount of uric acid and hydrogen peroxide resulting from the degradation of hypoxanthine by xanthine oxidase, the degradation of inosine by the combined action of nucleoside phosphorylase and xanthine oxidase and the degradation of inosine monophosphate by the combined action of nucleotidase, nucleoside phosphorylase and xanthine oxidase. Also within the scope of this invention is a method for the immobilization of nucleotidase on the walls of a polymeric tube such as polystyrene tube and the co-immobilization of nucleoside phosphorylase and xanthine oxidase on a porous polymeric membrane such as a nylon membrane.
    Type: Grant
    Filed: December 5, 1991
    Date of Patent: February 22, 1994
    Assignee: Her Majesty the Queen in right of Canada, as represented by the National Research Council of Canada
    Inventors: John H. T. Luong, Keith B. Male, An L. Nguyen