Uric acid + H20 Uricase Allantoin + H2O H2O2 + Phenolic chromogens
Peroxidase Red coloured compound.
9,987,203 B1; Unwined, Inc., Bunnell, FL, has patented a method of improving the cosmetic appearance of human teeth that entails contacting the teeth with a whitening powder composition after ingesting a chromogenic, tannin-containing food or beverage; and allowing the whitening powder to dissolve thereby reducing staining of the teeth caused by tannins and/or chromogens
Bleaching products work by penetrating the tubules of the tooth enamel and dentin to oxidize the chromogens
, which are dark or color compounds within the tooth.
and 3 samples revealed the presence of S.
are taken up by the pellicle and the color imparted is determined by the natural color of the chromogen
and the color seen on the tooth is considered to be derived mostly from polyphenolic compounds (15,16).
Because the non-DAB chromogens
tested nonspecifically bound melanin and staining was present in the negative control, DAB was chosen as the chromogen
for this assay for its crisp localization pattern and lack of nonspecific melanin binding.
However logistic problems involved in estimation of GFR from serum creatinine and creatinine clearance are inaccurate urine collection and volume measurement interference in creatinine measurement due to non-creatinine chromogens
and tubular secretion of creatinine (inhibited by cimetidine).
Advanced multispectral imaging systems remove cross-talk between chromogens
or fluorophores and are able to remove interfering tissue autofluorescence, thus providing quantitative data from which the per-cell intensity values are derived.
This method was based on the reducing power of phenolic hydroxyl groups (Hahn et al., 1984), which react with the phenol reagent to form chromogens
that can be detected spectrophotometrically.
Analytically, the situation is even more problematical, with interferences from "noncreatinine chromogens
," despite the introduction of kinetic rather than end-point assays, that not only have been a source of contention but also, until recently, have fueled a lack of consistency among kit manufacturers (11).
Double IHC for simultaneous demonstration of PCV2 and cytokeratin (DAKO-pancytokeratin, 1:200 dilution) was applied with diaminobenzidine and alkaline phosphatase as chromogens