ABSTRACT
Abstract Pigments produced by submerged fermentation of three filamentous fungi isolated from Brazilian caves, namely Aspergillus keveii, Penicillium flavigenum, and Epicoccum nigrum, were submitted to spray drying in presence of the adjuvants maltodextrin, modified starch or gum arabic. Yellow fine powders with low moisture content and water activity, and high color retention (> 70%) were successfully generated with a high product recovery ratio (> 50%), independently of the adjuvant used. The dried products have enhanced stability and potential to might be used as a natural colorant in food and pharmaceutical applications.
Subject(s)
Animals , Pigments, Biological/biosynthesis , Starch/biosynthesis , Fungi/metabolism , Gum Arabic , Maltose/biosynthesis , Aspergillus , Brazil , Caves/microbiology , Fungi/classification , Maltose/analogs & derivatives , Models, TheoreticalABSTRACT
O objetivo deste trabalho foi discutir, através de uma revisäo da literatura, as manchas dentárias extrínsecas pretas, elucidando o que säo e por quê removê-las. Sugestöes quanto à natureza química dos pigmentos pretos foram feitas e mostraram que este é um sal férrico, produzido pela bactéria. Prevotella melaninogênica
Subject(s)
Humans , Male , Female , Actinomyces/metabolism , Ferric Compounds/chemistry , Gingiva/microbiology , Oral Hygiene/adverse effects , Pigmentation , Pigments, Biological/biosynthesis , Prevotella melaninogenica/metabolism , Tobacco/adverse effects , Staining and Labeling , Fluorine/therapeutic use , Dental Scaling/methodsABSTRACT
Se purificó pioverdina de pseudomonas fluorescens desrrollada en medio sintético y se practicó un ensayo de toxicidad pra leucocitos totales humanos (LTH); se observó un alto índice de muerte y lisis celular, dependiendo de la concentración y tiempo de incubación. Dosis sublíticas redujeron la capacidad fagocítica de los LTH. Hubo síntesis del pigmento en sangre inoculada con cepas de P. fluorescens a 4-C. la precipitación salina del plasma indicó que las fracciones ricas en globulina y albúmina retuvieron pioverdina en distintos porcentajes (46% y 37% respectivamente). Mediante diálisis se observó que la fracción con albúmina mantenía mayor cantidad del pigmento unido e en estado de agregación