In the biobrea search engine, reagent is an important antibody. Reagent is basically used in chemical reactions. In biobrea, we have different types of reagents .Basically reagents are used to effect a transformation on an organic substrate. The reagent substance has also helped in while we purchasing or preparing a new chemical. It helps in measuring the purity level. The purity level set by American chemical society. Reagents are of different type one of them are just contain a single element. The reagent-quality water must have very low levels of impurities like sodium and chloride silica and bacteria,. It also has a very high electrical resistivity. Reagents are formed by mixing of inorganic and small organic matter. These are very beneficial in seeing the chemical reactions are present in the chemical reactions. One form of the reagent is analytical reagent which is useful to confirm the presence of another substance.