Color and transparency are determined from visual observation of the sample. Normal urine is straw yellow to amber in color. Abnormal colors include bright yellow, brown, black (gray), red, and green. These pigments may result from medications, dietary sources, or diseases.
limulus amebocyte lysate test. limulus amebocyte lysate test. LAL test. A test used to detect minute quantities of bacterial endotoxins and to test for pyrogens in various materials; it is also used to detect septicemia due to gram-negative bacteria. Limulus amebocyte lysate is formed from the lysed circulating amebocytes of the horseshoe crab (Limulus polyphemus).
Thin Layer Chromatography. Thin layer chromatography, or TLC, is a method for analyzing mixtures by separating. the compounds in the mixture. TLC can be used to help determine the number of. components in a mixture, the identity of compounds, and the purity of a compound. By. observing the appearance of a product or the disappearance of a reactant, it can also be. used to monitor the progress of a reaction.