In the present work it was developed an spectrophotometric method for fast determination of total chromium in the forra of Cr(III) through the formation of a colored compound with the 4-(2 -tiazolilazo resorcinol)-TAR reagent. ...

Cheese is the most consumed dairy product, and its popularity is attributed to its flavor, versatility of use, price, wide variety, and nutritional value. Recently, consumers have preferred white cheeses over yellow ones ...

In chapter I, studied the cassava leaf grown in the State of Bahia, Brazil, after undergoing thermal and fermentation processes in order to eliminate the hydrocyanic acid present in its structure. In this sense, the ...

In this work, a homologous series of eight (08) liquid crystals derived from aryloxycinnamates with a wide range of mesomorphism will be presented. The molecules investigated in this study were synthesized from the Wittig ...

Liquid crystal (LC) is the name given to describe materials that have an intermediary behavior between the three-dimensionally organized solid and the liquid state. Thermotropic LCs are capable of presenting characteristic ...

This study describes a novel method based on an ultrasound-assisted extraction microscale device (UAE-MSD) for the rapid and simultaneous determination of polycyclic aromatic hydrocarbons (PAHs) and polycyclic aromatic ...

Nitrogen compounds (N-compounds) are a small fraction chemical composition of oil (0,1 to 2,0%) and are present mainly as aromatic and heterocyclic structures, classified in two groups: basic (pyridines, quinolines and ...

O presente trabalho descreve a obtenção de derivados de -hidróxi ésteres quirais, obtidos pela combinação de síntese química e biotransformação. O estudo foi motivado pela perspectiva de identificar ...

A reconhecida importância de compostos heterocíclicos nitrogenados em diferentes áreas faz com que esforços constantes sejam empregados para desenvolvimento de novas rotas de síntese. Dentre estas, reações de ...