Metabolomics is the large-scale study of small molecules , commonly known as metabolites, within cells, biofluids, tissues or organisms. Collectively, these small molecules and their interactions within a biological system are known as the metabolome. Metabolomics is widely used to investigate numerous aspects of nutrition using a variety of samples ranging from plants and foods to human and animal tissues and biofluids. Plant metabolomics is increasingly realized as an important tool for investigations of systems biology