title: Microbiological research on soft drinks: discolouring of natural-flavoured products.
abstract: The results of experiments testing the effects of yeasts, sunlight, and temperature on the food dyes tartrazine, ponceau 4R, indigotin and azorubin (used for colouring ginger soft drink) are reported. Light was found to exert a greater influence than heat, and yeasts growth hastened colour degradation. Yeasts assimilated to varying extent the colouring compounds and, when failing to do it, showed a certain power of adsorption by the no longer viable cells.
authors.affiliation: Istituto di Microbiologia Agraria e Tecnica, Universita di Bologna, Italia.
authors.forename: G C
authors.initials: GC
authors.lastname: Turtura
authors.forename: A
authors.initials: A
authors.lastname: Minguzzi
mesh_terms: D001391:Azo Compounds / Q000378:metabolism / Q000528:radiation effects; D001628:Beverages; D003116:Color; D004396:Coloring Agents / Q000378:metabolism / Q000528:radiation effects; D004355:Drug Stability; D005505:Food Coloring Agents / Q000378:metabolism* / Q000528:radiation effects; D005516:Food Microbiology; D007203:Indigo Carmine; D007211:Indoles; D009282:Naphthalenesulfonates / Q000378:metabolism / Q000528:radiation effects; D012441:Saccharomyces cerevisiae / Q000302:isolation & purification / Q000378:metabolism*; D013053:Spectrophotometry; D013472:Sunlight; D013645:Tartrazine / Q000378:metabolism / Q000528:radiation effects; D013696:Temperature
chemical_list: D001391:Azo Compounds; D004396:Coloring Agents; D005505:Food Coloring Agents; D007211:Indoles; D009282:Naphthalenesulfonates; D007203:Indigo Carmine; C006671:azo rubin S; D013645:Tartrazine; C576297:ponceau 4R