Mode of action of creatinine on colour of cuprous oxide precipitate in Benedict's qualitative sugar test.
Creatinine appears to alter the colour and bulky nature of the cuprous oxide precipitate not by altering the chemical composition of the precipitate but by the physical process of retardation of the growth of newly formed yellow cuprous oxide crystals to large red crystals by adhering to their surface and blocking some sites for further crystal growth.
D000268:Adhesiveness; D011232:Chemical Precipitation; D003124:Colorimetry; D003300:Copper; D003404:Creatinine; D003460:Crystallization; D005069:Evaluation Studies as Topic; D005947:Glucose / Q000032:analysis; D006029:Glycosuria / Q000175:diagnosis*; D006801:Humans; D010084:Oxidation-Reduction
D003300:Copper; D003404:Creatinine; D005947:Glucose