HE MAJOR METHODS CURRENTLY IN USE for the determination of uric cid in biologic fluids are the colorimetric (1-3), the titrimetric (4), and he enzymatic (5-7). All of these methods are performed directly on the luid to be measured and are therefore subject to the effects of interfering ubstances present in these fluids. Since the colorimetric and titrimetric echnics depend on the reducing abili...

IPublished methods for the determination of plasma triglycerides are of two kinds, enzymatic (1-3) and colorimetric (4-7). Both require preliminary removal of phospholipids and saponification of triglycerides. With the enzymatic method, glycerin released is quantitatively determined with the specific enzyme GPDH’ and NAD. In the colorimetric methods, glycerin is oxidized to formaldehyde with pe...

Resistance to rifampin (rifampicin), isoniazid, and streptomycin of 69 Mycobacterium tuberculosis isolates was analyzed by an in-house method based on mycobacteriophage D29 and a colorimetric micromethod. Both methods showed sensitivity and specificity values ranging from 93% to 100%. These simple methods offer an option for drug resistance assessment of M. tuberculosis.

Radiometric, colorimetric, and two immunochemical methods for measuring total iron-binding capacity are compared. We evaluated the procedures on the basis of precision, applicability to a pediatric population, and accuracy as assessed by analytical recovery of purified transferrin. The immunoephelometric assay for transferrin provides significant advantages over the other methods examined.

Oral bacterial hydrogen sulfide (H2S) production was estimated comparing two different colorimetric methods in microtiter plate format. High H2S production was seen for Fusobacterium spp., Treponema denticola, and Prevotella tannerae, associated with periodontal disease. The production differed between the methods indicating that H2S production may follow different pathways.