A trace element is a chemical element of a minute quantity, a trace amount, especially used in referring to a micronutrient,
In nutrition, trace elements are classified into two groups: essential trace elements, and non-essential trace elements. Essential trace elements are needed for many physiological and biochemical processes in both plants and animals. Not only do trace elements play a role in biological processes but they also serve as catalysts to engage in redox – oxidation and reduction mechanisms.
Types
The two types of trace element in
biochemistry are classed as essential or non-essential.
Essential trace elements
An essential trace element is a
dietary element, a mineral that is only needed in minute quantities for the proper growth, development, and physiology of the organism.
The essential trace elements are those that are required to perform vital metabolic activities in organisms.
Essential trace elements in
human nutrition, and other animals include
iron (Fe) (hemoglobin),
copper (Cu) (respiratory pigments),
cobalt (Co) (Vitamin B12),
iodine (I),
manganese (Mn),
chlorine (Cl),
molybdenum (Mo),
selenium (Se) and
zinc (Zn) (enzymes).
Although they are essential, they become toxic at high concentrations.
Non-essential trace elements
Non-essential trace elements include
silver (Ag),
cadmium (Cd), mercury (Hg), and
lead (Pb). They have no known biological function in mammals, with toxic effects even at low concentration.
The structural components of cells and tissues that are required in the diet in gram quantities daily are known as bulk elements.
See also
