Three experiments were conducted to develop a sensitive and reliable fluorometric thiobarbituric acid (TBA) reactive substances (TBARS) method to determine lipid oxidation products in meat. The first study was conducted to find the optimum sample preparation conditions for meat in the fluorometric method. The second study was to compare the original and the modified methods by using meat and bl...

background and objectives: numerous procedures in biology and medicine require the counting of cells. direct enumer- ation of colony forming units (cfus) is time-consuming and dreary accurate cell counting on plates with high numbers of cfus is error prone. in this study we report a new indirect cell counting method that was developed based on the use of redsafe fluorometric assay. the usefulne...

A. FLUOROMETRIC METHOD for the determination of histidine was developed in response to the need for an accurate and precise manual method for the confirmation of histidinemia (1). it is based on the fluorometric method of Shore et a!. (2), which involves the condensation of histaniine with o-phthalaidehyde (OPT) in a strongly alkaline solution to form a rather labile fluorescent compound which ...

A method is described for the fluorometric determination of fecal bile acids. The method combines solvent extraction and thin-layer chromatography (TLC) isolation tech nics with a fluorometric method for measuring total bile acids. Recoveries of individual bile acids added to feces averaged 107% with a standard deviation of ± 5.6%. Bile acid excretion in normal human subjects on a self-selected...

A simple direct fluorometric method for rapid identification of group A streptococci is described. The method permits the detection of the organism in mixed cultures without the aid of a microscope and is amenable to automated processing of specimens. Experience with the indirect fluorometric method revealed that nontrypsinized cells from a 10-fold dilution of overnight broth cultures could be ...

A series of new benzimidazole derivatives with potential anticancer activity were tested as a new topoisomerase I inhibitors. The fluorometric method was used to determine in vitro the quantitative level of plasmid DNA relaxation by these compounds. Optimization of the fluorometric system and validation of the established analytical method were performed. Out of benzimidazole derivatives which ...

Utilizing a simple, rapid, and inexpensive modification of a fluorometric method, we determined the normal concentrations of nucleic acids (DNA and RNA) in human blood plasma of healthy individuals. DNA concentrations (13.9 ± 3.7 mg/ liter) were in excellent agreement with those reported by other methods. However, the RNA concentrations (144 ± 22 mg/liter) we found were higher than previously r...

We describe two fully enzymic methods, fluorometric and colorimetric, for determination of triglycerides (triacylglycerols) in serum. Samples are incubated with microbial lipase for 10 min, and the glycerol released from the triglycerides is oxidized by NAD+ in the presence of glycerol dehydrogenase. In the fluorometric method, the resulting NADH is in turn oxidized by resazurin as catalyzed by...

An atomic absorption spectrophotometric (AAS) and a fluorometric method for the measurement of serum calcium were found to be corn-parablein acceptable reproducibility. The recovery figures obtained by the fluorornetric procedure were considerably lower than those given by AAS in the 2-4 mEq./L. range, although recoveriesat higher levels (6 mEq./L.) were acceptable. The average recovery for the...