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Bilirubin (formerly referred to as haematoidin) is the yellow breakdown product of normal heme catabolism, caused by the body's clearance of aged red blood cells which contain hemoglobin.Bilirubin is excreted in bile and urine, and elevated levels may indicate certain diseases.ilirubin consists of an open chain of four pyrrole-like rings (tetrapyrrole). In heme, these four rings are connected into a larger ring, called a porphyrin ring. Bilirubin can be conjugated with a molecule of glucuronic acid which makes it soluble in water (see below).
Tweet. Bilirubin is a substance that is present in the blood. When the red blood cells die parts of the cells are broken down either to be used once again or are excreted. Bilirubin is the part that is used once again for the purpose of digestion. Bilirubin is recycled in the liver where it gets converted into bile. The bile is then mixes with some bacteria and turns dark yellow in color or looks like clay. This is the why the human feces is the color it is.