Pranav Shrivastav

Os estudos farmacocin ticos e de bioequival ncia requeremm todos deensaio muito precisos e precisos, bem validados para quantificar os medicamentos em amostras biol gicas. Osm todos de ensaio t m de ser suficientemente sens veis para determinar a concentra o da amostra biol gica da droga e/oudo(s) seu(s) metabolito(s) durante um per odo de cerca de cinco meias-vidas de elimina o ap s a dosagem da droga. Os m todos de ensaio tamb m t m de ser muito selectivos para assegurar dados fi veis, livres da interfer ncia de98 compostos nas amostras biol gicas. Al m disso, os m todos t m de ser t o robustos e rent veis quantoposs vel, o que se torna particularmente importante para os estudos bioequivalentes. Acima de tudo, os m todos de ensaio devemser capazes de resistir inspec o das autoridades nacionais de registo de medicamentos que os julgam combase emcrit rios estabelecidos pela harmonia mundial.

Dyes may be defined as substances that, when applied to a substrate provides color by a process that alters, at least temporarily, any crystal structure of the colored substances. Such substances with considerable coloring capacity are widely employed in the textile, pharmaceutical, food, cosmetics, plastics, photographic and paper industries. The dyes can adhere to compatible surfaces by solution, by forming covalent bond or complexes with salts or metals, by physical adsorption or by mechanical retention. They generally have rather complicated structures which are made by reactions involving building blocks known as intermediates. Most of these are aromatic compounds with substituent groups such as -NH2, -OH, -NO2 and -SO3H which alter the reactivity of the cyclic compound and sometimes the color of the dye. Both inorganic and organic materials are needed to make dyes and intermediates. Dyes add value to products far beyond their cost. Frequently the color of a product is the reason for its sale. A dye must be colored, but it must also be able to impart color to something else on a reasonably permanent basis before it can be considered as a dye.